Publications by Todd Huffman


Searches for electroweak production of supersymmetric particles with compressed mass spectra in √s=13 TeV pp collisions with the ATLAS detector

Physical Review D: Particles, Fields, Gravitation and Cosmology American Physical Society 101 (2020) 052005

L Ambroz, G Artoni, M Backes, W Balunas, A Barr, D Bortoletto, Foti, J Frost, GE Gallardo, E Gallas, C Gwenlan, B Huffman, C Merlassino, K Nagai, R Nickerson, SR Paredes Saenz, Petrov, Sharma, Shipsey, M Stankaityte, C Tosciri, Wölker, Zgubič

This paper presents results of searches for the electroweak production of supersymmetric particles in models with compressed mass spectra. The searches use 139 fb⁻¹ of √s = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events with missing transverse momentum and two same-flavor, oppositely charged, low-transverse-momentum leptons are selected, and are further categorized by the presence of hadronic activity from initial-state radiation or a topology compatible with vector-boson fusion processes. The data are found to be consistent with predictions from the Standard Model. The results are interpreted using simplified models of R-parity-conserving supersymmetry in which the lightest supersymmetric partner is a neutralino with a mass similar to the lightest chargino, the second-to-lightest neutralino, or the slepton. Lower limits on the masses of charginos in different simplified models range from 193 to 240 GeV for moderate mass splittings, and extend down to mass splittings of 1.5 to 2.4 GeV at the LEP chargino bounds (92.4 GeV). Similar lower limits on degenerate light-flavor sleptons extend up to masses of 251 GeV and down to mass splittings of 550 MeV. Constraints on vector-boson fusion production of electroweak SUSY states are also presented.


Search for pair production of Higgs bosons in the bb¯¯bb¯¯ final state using proton-proton collisions at s√=13 TeV with the ATLAS detector

Journal of High Energy Physics Springer Verlag 2019 (2019) 30

M Aaboud, G Aad, B Abbott, L Ambroz, G Artoni, M Backes, A Barr, L Beresford, D Bortoletto, JTP Burr, A Cooper-Sarkar, J Frost, E Gallas, M Nelson, R Nickerson, N Norjoharuddeen, M Petrov, MA Pickering, A Sharma, I Shipsey, C Tosciri, J Tseng, G Viehhauser, L Vigani, A Weidberg

A search for Higgs boson pair production in the bb¯¯bb¯¯ final state is carried out with up to 36.1 fb−1 of LHC proton-proton collision data collected at s√=13 TeV with the ATLAS detector in 2015 and 2016. Three benchmark signals are studied: a spin-2 graviton decaying into a Higgs boson pair, a scalar resonance decaying into a Higgs boson pair, and Standard Model non-resonant Higgs boson pair production. Two analyses are carried out, each implementing a particular technique for the event reconstruction that targets Higgs bosons reconstructed as pairs of jets or single boosted jets. The resonance mass range covered is 260–3000 GeV. The analyses are statistically combined and upper limits on the production cross section of Higgs boson pairs times branching ratio to bb¯¯bb¯¯ are set in each model. No significant excess is observed; the largest deviation of data over prediction is found at a mass of 280 GeV, corresponding to 2.3 standard deviations globally. The observed 95% confidence level upper limit on the non-resonant production is 13 times the Standard Model prediction. Open image in new window


Charge collection in irradiated HV-CMOS detectors

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2018)

B Hiti, A Affolder, K Arndt, R Bates, M Benoit, FD Bello, A Blue, D Bortoletto, M Buckland, C Buttar, P Caragiulo, D Das, D Doering, J Dopke, A Dragone, F Ehrler, V Fadeyev, W Fedorko, Z Galloway, C Gay, H Grabas, IM Gregor, P Grenier, A Grillo, Y Han, M Hoeferkamp, LBA Hommels, T Huffman, J John, K Kanisauskas, C Kenney, G Kramberger, Z Liang, I Mandić, D Maneuski, F Martinez-Mckinney, S McMahon, L Meng, M Mikuž, D Muenstermann, R Nickerson, I Peric, P Phillips, R Plackett, F Rubbo, L Ruckman, J Segal, S Seidel, A Seiden, I Shipsey, W Song, M Stanitzki, D Su, C Tamma, R Turchetta, L Vigani, J Volk, R Wang, M Warren, F Wilson, S Worm, Q Xiu, J Zhang, H Zhu

© 2018 Elsevier B.V. Active silicon detectors built on p-type substrate are a promising technological solution for large area silicon trackers such as those at the High Luminosity LHC, but the radiation hardness of this novel approach has to be evaluated. Active n-in-p strip detector prototypes CHESS2 for ATLAS with different substrate resistivities in the range of 20–1000 Ωcm were irradiated with neutrons and protons up to a fluence of 2×10 15 n eq cm −2 and 3.6×10 15 n eq cm −2 . Charge collection in passive test structures on the chip was evaluated using Edge-TCT and minimum ionising electrons from 90 Sr. Results were used to assess radiation hardness of the detector in the given fluence range and to determine parameters of initial acceptor removal in different substrates.


ATLAS b-jet identification performance and efficiency measurement with tt¯ events in pp collisions at s√=13 TeV

European Physical Journal C: Particles and Fields Springer 79 (2019) 970-

The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b-hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency with which these algorithms identify jets containing b-hadrons is measured in collision data. The measurement uses a likelihood-based method in a sample highly enriched in tt¯ events. The topology of the t→Wb decays is exploited to simultaneously measure both the jet flavour composition of the sample and the efficiency in a transverse momentum range from 20 to 600 GeV. The efficiency measurement is subsequently compared with that predicted by the simulation. The data used in this measurement, corresponding to a total integrated luminosity of 80.5 fb−1, were collected in proton–proton collisions during the years 2015–2017 at a centre-of-mass energy s√= 13 TeV. By simultaneously extracting both the efficiency and jet flavour composition, this measurement significantly improves the precision compared to previous results, with uncertainties ranging from 1 to 8% depending on the jet transverse momentum.


Search for Higgs boson pair production in the b¯bWW∗ decay mode at √s = 13 TeV with the ATLAS detector

Journal of High Energy Physics Springer Berlin Heidelberg 2019 (2019) 92

M Aaboud, G Aad, B Abbott, L Ambroz, G Artoni, M Backes, AJ Barr, L Beresford, D Bortoletto, J Burr, AM Cooper-Sarkar, JA Frost, EJ Gallas, F Giuli, C Gwenlan, C Hays, BT Huffman, C Issever, JKK Liu, L Marchese, K Nagai, ME Nelson, RB Nickerson, L Vigani, G Zemaityte

A search for Higgs boson pair production in the b ¯bWW∗ decay mode is performed in the b ¯b`νqq final state using 36.1 fb−1 of proton-proton collision data at a centreof-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. No evidence of events beyond the background expectation is found. Upper limits on the non-resonant pp → HH production cross section of 10 pb and on the resonant production cross section as a function of the HH invariant mass are obtained. Resonant production limits are set for scalar and spin-2 graviton hypotheses in the mass range 500 to 3000 GeV.


Search for low-mass dijet resonances using trigger-level jets with the ATLAS detector in pp collisions at √s=13 TeV

Physical Review Letters American Physical Society 121 (2018) 081801

KJ Anderson, A Andreazza, V Andrei, S Angelidakis, I Angelozzi, A Angerami, AV Anisenkov, A Annovi, C Antel, MT Anthony, M Antonelli, DJA Antrim, ATH Arce, RE Ardell, FA Arduh, J-F Arguin, S Argyropoulos, O Arnaez, O Arslan, A Artamonov, G Artoni, S Artz, S Asai, N Asbah, EM Asimakopoulou

Searches for dijet resonances with sub-TeV masses using the ATLAS detector at the Large Hadron Collider can be statistically limited by the bandwidth available to inclusive single-jet triggers, whose data-collection rates at low transverse momentum are much lower than the rate from standard model multijet production. This Letter describes a new search for dijet resonances where this limitation is overcome by recording only the event information calculated by the jet trigger algorithms, thereby allowing much higher event rates with reduced storage needs. The search targets low-mass dijet resonances in the range 450–1800 GeV. The analyzed data set has an integrated luminosity of up to 29.3 fb−1 and was recorded at a center-of-mass energy of 13 TeV. No excesses are found; limits are set on Gaussian-shaped contributions to the dijet mass distribution from new particles and on a model of dark-matter particles with axial-vector couplings to quarks.


Radiation hardness studies of AMS HV-CMOS 350 nm prototype chip HVStripV1

Journal of Instrumentation IOP Publishing 12 (2017) P02010-

K Kanisauskas, A Affolder, K Arndt, R Bates, M Benoit, FD Bello, A Blue, D Bortoletto, M Buckland, C Buttar, P Caragiulo, D Das, J Dopke, A Dragone, F Ehrler, V Fadeyev, Z Galloway, H Grabas, IM Gregor, P Grenier, A Grillo, B Hiti, M Hoeferkamp, LBA Hommels, BT Huffman

CMOS active pixel sensors are being investigated for their potential use in the ATLAS inner tracker upgrade at the HL-LHC. The new inner tracker will have to handle a significant increase in luminosity while maintaining a sufficient signal-to-noise ratio and pulse shaping times. This paper focuses on the prototype chip "HVStripV1" (manufactured in the AMS HV-CMOS 350nm process) characterization before and after irradiation up to fluence levels expected for the strip region in the HL-LHC environment. The results indicate an increase of depletion region after irradiation for the same bias voltage by a factor of ≈2.4 and ≈2.8 for two active pixels on the test chip. There was also a notable increase in noise levels from 85 e− to 386 e− and from 75 e− to 277 e− for the corresponding pixels.


Measurement of the bb dijet cross section in pp collisions at √s = 7 TeV with the ATLAS detector

European Physical Journal C Springer 76 (2016) 670-

YS Gao, FMG Walls, C García, JEG Navarro, M Garcia-Sciveres, RW Gardner, N Garelli, V Garonne, AG Bravo, C Gatti, A Gaudiello, G Gaudio, B Gaur, L Gauthier, IL Gavrilenko, C Gay, G Gaycken, EN Gazis, Z Gecse, CNP Gee, C Geich-Gimbel, M Geisen, MP Geisler, C Gemme, MH Genest

The dijet production cross section for jets containing a b-hadron (b-jets) has been measured in proton–proton collisions with a centre-of-mass energy of √s = 7 TeV, using the ATLAS detector at the LHC. The data used correspond to an integrated luminosity of 4.2 fb−1. The cross section is measured for events with two identified b-jets with a transverse momentum pT > 20GeV and a minimum separation in the η–φ plane of ΔR = 0.4. At least one of the jets in the event is required to have pT > 270GeV. The cross section is measured differentially as a function of dijet invariant mass, dijet transverse momentum, boost of the dijet system, and the rapidity difference, azimuthal angle and angular distance between the b-jets. The results are compared to different predictions of leading order and next-to-leading order perturbative quantum chromodynamics matrix elements supplemented with models for parton-showers and hadronization.


Radiation hardness of two CMOS prototypes for the ATLAS HL-LHC upgrade project

JOURNAL OF INSTRUMENTATION 11 (2016) ARTN C02005

BT Huffman, A Affolder, K Arndt, R Bates, M Benoit, F Di Bello, A Blue, D Bortoletto, M Buckland, C Buttar, P Caragiulo, D Das, J Dopke, A Dragone, F Ehrler, V Fadeyev, Z Galloway, H Grabas, IM Gregor, P Grenier, A Grillo, M Hoeferkamp, LBA Hommeis, J John, K Kanisauskas, C Kenney, J Kramberger, Z Liang, I Mandic, D Maneuski, F Martinez-Mckinney, S McMahon, L Meng, M Mikuz, D Muenstermann, R Nickerson, I Peric, P Phillips, R Plackett, F Rubbo, J Segal, S Seidel, A Seiden, I Shipsey, W Song, M Stanitzki, D Su, C Tamma, R Turchetta, L Vigani, J Volk, R Wang, M Warren, F Wilson, S Worm, Q Xiu, J Zhang, H Zhu


Search for new phenomena in dijet mass and angular distributions from pp collisions at root s=13 TeV with the ATLAS detector

Physics Letters B Elsevier 754 (2016) 302-322

G Artoni, AJ Barr, K Becker, JK Behr, L Beresford, D Bortoletto, AM Cooper-Sarkar, M Crispin Ortuzar, JA Frost, EJ Gallas, S Gupta, C Gwenlan, D Hall, CP Hays, J Henderson, J Howard, TB Huffman, C Issever, CW Kalderon, LA Kogan, K Nagai, RB Nickerson, Z J, M Crispin Ortuzar

This Letter describes a model-agnostic search for pairs of jets (dijets) produced by resonant and non-resonant phenomena beyond the Standard Model in 3.6 fb-1 of proton-proton collisions with a centre-of-mass energy of s=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The distribution of the invariant mass of the two leading jets is examined for local excesses above a data-derived estimate of the smoothly falling prediction of the Standard Model. The data are also compared to a Monte Carlo simulation of Standard Model angular distributions derived from the rapidity of the two jets. No evidence of anomalous phenomena is observed in the data, which are used to exclude, at 95% CL, quantum black holes with threshold masses below 8.3 TeV, 8.1 TeV, or 5.1 TeV in three different benchmark scenarios; resonance masses below 5.2 TeV for excited quarks, 2.6 TeV in a W' model, a range of masses starting from mZ'=1.5 TeV and couplings from gq=0.2 in a Z' model; and contact interactions with a compositeness scale below 12.0 TeV and 17.5 TeV respectively for destructive and constructive interference between the new interaction and QCD processes. These results significantly extend the ATLAS limits obtained from 8 TeV data. Gaussian-shaped contributions to the mass distribution are also excluded if the effective cross-section exceeds values ranging from approximately 50-300 fb for masses below 2 TeV to 2-20 fb for masses above 4 TeV.


Charge collection studies in irradiated HV-CMOS particle detectors

Journal of Instrumentation IOP Publishing 11 (2016) P04007-P04007

A Affolder, M Andelković, K Arndt, C Buttar, P Caragiulo, V Cindro, D Das, J Dopke, A Dragone, F Ehrler, V Fadeyev, Z Galloway, H Grabas, IM Gregor, P Grenier, A Grillo, LBA Hommels, B Huffman, K Kanisauskas, C Kenney, G Kramberger, S McMahon, M Mikuž, R Nickerson, I Perić

Charge collection properties of particle detectors made in HV-CMOS technology were investigated before and after irradiation with reactor neutrons. Two different sensor types were designed and processed in 180 and 350 nm technology by AMS. Edge-TCT and charge collection measurements with electrons from 90Sr source were employed. Diffusion of generated carriers from undepleted substrate contributes significantly to the charge collection before irradiation, while after irradiation the drift contribution prevails as shown by charge measurements at different shaping times. The depleted region at a given bias voltage was found to grow with irradiation in the fluence range of interest for strip detectors at the HL-LHC. This leads to large gains in the measured charge with respect to the one before irradiation. The increase of the depleted region was attributed to removal of effective acceptors. The evolution of depleted region with fluence was investigated and modeled. Initial studies show a small effect of short term annealing on charge collection.


Study of built-in amplifier performance on HV-CMOS sensor for the ATLAS phase-II strip tracker upgrade

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 831 (2016) 156-160

Z Liang, A Affolder, K Arndt, R Bates, M Benoit, F Di Bello, A Blue, D Bortoletto, M Buckland, C Buttar, P Caragiulo, D Das, J Dopke, A Dragone, E Ehrler, V Fadeyev, Z Galloway, H Grabas, IM Gregor, P Grenier, A Grillo, M Hoeferkamp, LBA Hommels, BT Huffman, J John, K Kanisauskas, C Kenney, J Kramberger, I Mandic, D Maneuski, E Martinez-Mckinney, S McMahon, L Meng, M Mikuz, D Muenstermann, R Nickerson, I Peric, P Phillips, R Plackett, E Rubbo, J Segal, S Seidel, A Seiden, I Shipsey, W Song, M Stanitzki, D Su, C Tamma, R Turchetta, L Vigani, J Volk, R Wang, M Warren, E Wilson, S Worm, Q Xiu, J Zhang, H Zhu


Tagging b quarks at extreme energies without tracks

Journal of Physics G: Nuclear and Particle Physics IOP Publishing 43 (2016) 085001

B Huffman, C Jackson, J Tseng

We describe a new hit-based b-tagging technique for high energy jets and study its performance with a Geant4-based simulation. The technique uses the fact that at sufficiently high energy a B meson or baryon can live long enough to traverse the inner layers of pixel detectors such as those in the ATLAS, ALICE, or CMS experiments prior to decay. By first defining a 'jet' via the calorimeter, and then counting hits within that jet between pixel layers at increasing radii, we show it is possible to identify jets that contain b quarks by detecting a jump in the number of hits without tracking requirements. We show that the technique maintains fiducial efficiency at TeV scale B hadron energies, far beyond the range of existing algorithms, and improves upon conventional b-taggers.


Search for new phenomena in the dijet mass distribution using pp collision data at root s=8 TeV with the ATLAS detector

PHYSICAL REVIEW D 91 (2015) ARTN 052007

G Aad, B Abbott, J Abdallah, SA Khalek, O Abdinov, R Aben, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, R Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, J Adelman, S Adomeit, T Adye, T Agatonovic-Jovin, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, F Ahmadov, G Aielli, H Akerstedt, TPA Akesson, G Akimoto, AV Akimov, GL Alberghi, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, G Alimonti, L Alio, J Alison, BMM Allbrooke, LJ Allison, PP Allport, J Almond, A Aloisio, A Alonso, F Alonso, C Alpigiani, A Altheimer, BA Gonzalez, MG Alviggi, K Amako, Y Amaral Coutinho, C Amelung, D Amidei, SP Amor Dos Santos, A Amorim, S Amoroso, N Amram, G Amundsen, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, S Angelidakis, I Angelozzi, P Anger, A Angerami, F Anghinolfi, AV Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, LA Bella, R Apolle, G Arabidze, I Aracena, Y Arai, JP Araque, ATH Arce, J-F Arguin, S Argyropoulos, M Arik, AJ Armbruster, O Arnaez, V Arnal, H Arnold, M Arratia, O Arslan, A Artamonov, G Artoni, S Asai, N Asbah, A Ashkenazi, B Asman, L Asquith, K Assamagan, R Astalos, M Atkinson, NB Atlay, B Auerbach, K Augsten, M Aurousseau, G Avolio, G Azuelos, Y Azuma, MA Baak, A Baas, C Bacci, H Bachacou, K Bachas, M Backes, M Backhaus, JB Mayes, E Badescu, P Bagiacchi, P Bagnaia, Y Bai, T Bain, JT Baines, OK Baker, P Balek, F Balli, E Banas, S Banerjee, AAE Bannoura, V Bansal, HS Bansil, L Barak, SP Baranov, EL Barberio, D Barberis, M Barbero, T Barillari, M Barisonzi, T Barklow, N Barlow, BM Barnett, RM Barnett, Z Barnovska, A Baroncelli, G Barone, AJ Barr, F Barreiro, JBG da Costa, R Bartoldus, AE Barton, P Bartos, V Bartsch, A Bassalat, A Basye, RL Bates, JR Batley, M Battaglia, M Battistin, F Bauer, HS Bawa, MD Beattie, T Beau, PH Beauchemin, R Beccherle, P Bechtle, HP Beck, K Becker, S Becker, M Beckingham, C Becot, AJ Beddall, A Beddall, S Bedikian, VA Bednyakov, CP Bee, LJ Beemster, TA Beermann, M Begel, K Behr, C Belanger-Champagne, PJ Bell, WH Bell, G Bella, L Bellagamba, A Bellerive, M Bellomo, K Belotskiy, O Beltramello, O Benary, D Benchekroun, K Bendtz, N Benekos, Y Benhammou, EB Noccioli, JAB Garcia, DP Benjamin, JR Bensinger, K Benslama, S Bentvelsen, D Berge, EB Kuutmann, N Berger, F Berghaus, J Beringer, C Bernard, P Bernat, C Bernius, FU Bernlochner, T Berry, P Berta, C Bertella, G Bertoli, F Bertolucci, C Bertsche, D Bertsche, MI Besana, GJ Besjes, OB Bylund, M Bessner, N Besson, C Betancourt, S Bethke, W Bhimji, RM Bianchi, L Bianchini, M Bianco, O Biebel, SP Bieniek, K Bierwagen, J Biesiada, M Biglietti, JB De Mendizabal, H Bilokon, M Bindi, S Binet, A Bingul, C Bini, CW Black, JE Black, KM Black, D Blackburn, RE Blair, J-B Blanchard, T Blazek, I Bloch, C Blocker, W Blum, U Blumenschein, GJ Bobbink, VS Bobrovnikov, SS Bocchetta, A Bocci, C Bock, CR Boddy, M Boehler, TT Boek, JA Bogaerts, AG Bogdanchikov, A Bogouch, C Bohm, J Bohm, V Boisvert, T Bold, V Boldea, AS Boldyrev, M Bomben, M Bona, M Boonekamp, A Borisov, G Borissov, M Borri, S Borroni, J Bortfeldt, V Bortolotto, K Bos, D Boscherini, M Bosman, H Boterenbrood, J Boudreau, J Bouffard, EV Bouhova-Thacker, D Boumediene, C Bourdarios, N Bousson, S Boutouil, A Boveia, J Boyd, IR Boyko, J Bracinik, A Brandt, G Brandt, O Brandt, U Bratzler, B Brau, JE Brau, HM Braun, SF Brazzale, B Brelier, K Brendlinger, AJ Brennan, R Brenner, S Bressler, K Bristow, TM Bristow, D Britton, FM Brochu, I Brock, R Brock, C Bromberg, J Bronner, G Brooijmans, T Brooks, WK Brooks, J Brosamer, E Brost, J Brown, PAB de Renstrom, D Bruncko, R Bruneliere, S Brunet, A Bruni, G Bruni, M Bruschi, L Bryngemark, T Buanes, Q Buat, F Bucci, P Buchholz, RM Buckingham, AG Buckley, SI Buda, IA Budagov, F Buehrer, L Bugge, MK Bugge, O Bulekov, AC Bundock, H Burckhart, S Burdin, B Burghgrave, S Burke, I Burmeister, E Busato, D Buescher, V Buescher, P Bussey, CP Buszello, B Butler, JM Butler, AI Butt, CM Buttar, JM Butterworth, P Butti, W Buttinger, A Buzatu, M Byszewski, S Cabrera Urban, D Caforio, O Cakir, P Calafiura, A Calandri, G Calderini, P Calfayan, R Calkins, LP Caloba, D Calvet, S Calvet, RC Toro, S Camarda, D Cameron, LM Caminada, R Caminal Armadans, S Campana, M Campanelli, A Campoverde, V Canale, A Canepa, MC Bret, J Cantero, R Cantrill, T Cao, MDMC Garrido, I Caprini, M Caprini, M Capua, R Caputo, R Cardarelli, T Carli, G Carlino, L Carminati, S Caron, E Carquin, GD Carrillo-Montoya, JR Carter, J Carvalho, D Casadei, MP Casado, M Casolino, E Castaneda-Miranda, A Castelli, V Castillo Gimenez, NF Castro, P Catastini, A Catinaccio, JR Catmore, A Cattai, G Cattani, V Cavaliere, D Cavalli, M Cavalli-Sforza, V Cavasinni, F Ceradini, B Cerio, K Cerny, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, M Cerv, A Cervelli, SA Cetin, A Chafaq, D Chakraborty, I Chalupkova, P Chang, B Chapleau, JD Chapman, D Charfeddine, DG Charlton, CC Chau, CAC Barajas, S Cheatham, A Chegwidden, S Chekanov, SV Chekulaev, GA Chelkov, MA Chelstowska, C Chen, H Chen, K Chen, L Chen, S Chen, X Chen, Y Chen, Y Chen, HC Cheng, Y Cheng, A Cheplakov, R Cherkaoui El Moursli, V Chernyatin, E Cheu, L Chevalier, V Chiarella, G Chiefari, JT Childers, A Chilingarov, G Chiodini, AS Chisholm, RT Chislett, A Chitan, MV Chizhov, S Chouridou, BKB Chow, D Chromek-Burckhart, ML Chu, J Chudoba, JJ Chwastowski, L Chytka, G Ciapetti, AK Ciftci, R Ciftci, D Cinca, V Cindro, A Ciocio, P Cirkovic, ZH Citron, M Citterio, M Ciubancan, A Clark, PJ Clark, RN Clarke, W Cleland, JC Clemens, C Clement, Y Coadou, M Cobal, A Coccaro, J Cochran, L Coffey, JG Cogan, J Coggeshall, B Cole, S Cole, AP Colijn, J Collot, T Colombo, G Colon, G Compostella, P Conde Muino, E Coniavitis, MC Conidi, SH Connell, IA Connelly, SM Consonni, V Consorti, S Constantinescu, C Conta, G Conti, F Conventi, M Cooke, BD Cooper, AM Cooper-Sarkar, NJ Cooper-Smith, K Copic, T Cornelissen, M Corradi, F Corriveau, A Corso-Radu, A Cortes-Gonzalez, G Cortiana, G Costa, MJ Costa, D Costanzo, D Cote, G Cottin, G Cowan, BE Cox, K Cranmer, G Cree, S Crepe-Renaudin, F Crescioli, WA Cribbs, MC Ortuzar, M Cristinziani, V Croft, G Crosetti, C-M Cuciuc, TC Donszelmann, J Cummings, M Curatolo, C Cuthbert, H Czirr, P Czodrowski, Z Czyczula, S D'Auria, M D'Onofrio, MJ Da Cunha Sargedas De Sousa, C Da Via, W Dabrowski, A Dafinca, T Dai, O Dale, F Dallaire, C Dallapiccola, M Dam, AC Daniells, MD Hoffmann, V Dao, G Darbo, S Darmora, JA Dassoulas, A Dattagupta, W Davey, C David, T Davidek, E Davies, M Davies, O Davignon, AR Davison, P Davison, Y Davygora, E Dawe, I Dawson, RK Daya-Ishmukhametova, K De, R de Asmundis, S De Castro, S De Cecco, N De Groot, P de Jong, H De la Torre, F De Lorenzi, L De Nooij, D De Pedis, A De Salvo, U De Sanctis, A De Santo, JBDV De Regie, WJ Dearnaley, R Debbe, C Debenedetti, B Dechenaux, DV Dedovich, I Deigaard, J Del Peso, T Del Prete, F Deliot, CM Delitzsch, M Deliyergiyev, A Dell'Acqua, L Dell'Asta, M Dell'Orso, M Della Pietra, D della Volpe, M Delmastro, PA Delsart, C Deluca, S Demers, M Demichev, A Demilly, SP Denisov, D Derendarz, JE Derkaoui, F Derue, P Dervan, K Desch, C Deterre, PO Deviveiros, A Dewhurst, S Dhaliwal, A Di Ciaccio, L Di Ciaccio, A Di Domenico, C Di Donato, A Di Girolamo, B Di Girolamo, A Di Mattia, B Di Micco, R Di Nardo, A Di Simone, R Di Sipio, D Di Valentino, FA Dias, MA Diaz, EB Diehl, J Dietrich, TA Dietzsch, S Diglio, A Dimitrievska, J Dingfelder, C Dionisi, P Dita, S Dita, F Dittus, F Djama, T Djobava, MAB do Vale, A Do Valle Wemans, D Dobos, C Doglioni, T Doherty, T Dohmae, J Dolejsi, Z Dolezal, BA Dolgoshein, M Donadelli, S Donati, P Dondero, J Donini, J Dopke, A Doria, MT Dova, AT Doyle, M Dris, J Dubbert, S Dube, E Dubreuil, E Duchovni, G Duckeck, OA Ducu, D Duda, A Dudarev, F Dudziak, L Duflot, L Duguid, M Duehrssen, M Dunford, HD Yildiz, M 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J Price, LE Price, D Prieur, M Primavera, M Proissl, K Prokofiev, F Prokoshin, E Protopapadaki, S Protopopescu, J Proudfoot, M Przybycien, H Przysiezniak, E Ptacek, D Puddu, E Pueschel, D Puldon, M Purohit, P Puzo, J Qian, G Qin, Y Qin, A Quadt, DR Quarrie, WB Quayle, M Queitsch-Maitland, D Quilty, A Qureshi, V Radeka, V Radescu, SK Radhakrishnan, P Radloff, P Rados, F Ragusa, G Rahal, S Rajagopalan, M Rammensee, AS Randle-Conde, C Rangel-Smith, K Rao, F Rauscher, TC Rave, T Ravenscroft, M Raymond, AL Read, NP Readioff, DM Rebuzzi, A Redelbach, G Redlinger, R Reece, K Reeves, L Rehnisch, H Reisin, M Relich, C Rembser, H Ren, ZL Ren, A Renaud, M Rescigno, S Resconi, OL Rezanova, P Reznicek, R Rezvani, R Richter, M Ridel, P Rieck, J Rieger, M Rijssenbeek, A Rimoldi, L Rinaldi, E Ritsch, I Riu, F Rizatdinova, E Rizvi, SH Robertson, A Robichaud-Veronneau, D Robinson, JEM Robinson, A Robson, C Roda, L Rodrigues, S Roe, O Rohne, S Rolli, A Romaniouk, M Romano, E Romero Adam, N Rompotis, M Ronzani, L Roos, E Ros, S Rosati, K Rosbach, M Rose, P Rose, PL Rosendahl, O Rosenthal, V Rossetti, E Rossi, LP Rossi, R Rosten, M Rotaru, I Roth, J Rothberg, D Rousseau, CR Royon, A Rozanov, Y Rozen, X Ruan, F Rubbo, I Rubinskiy, VI Rud, C Rudolph, MS Rudolph, F Ruehr, A Ruiz-Martinez, Z Rurikova, NA Rusakovich, A Ruschke, JP Rutherfoord, N Ruthmann, YF Ryabov, M Rybar, G Rybkin, NC Ryder, AF Saavedra, S Sacerdoti, A Saddique, I Sadeh, HF-W Sadrozinski, R Sadykov, FS Tehrani, H Sakamoto, Y Sakurai, G Salamanna, A Salamon, M Saleem, D Salek, PHS De Bruin, D Salihagic, A Salnikov, J Salt, D Salvatore, F Salvatore, A Salvucci, A Salzburger, D Sampsonidis, A Sanchez, J Sanchez, V Sanchez Martinez, H Sandaker, RL Sandbach, HG Sander, MP Sanders, M Sandhoff, T Sandoval, C Sandoval, R Sandstroem, DPC Sankey, A Sansoni, C Santoni, R Santonico, H Santos, IS Castillo, K Sapp, A Sapronov, JG Saraiva, B Sarrazin, G Sartisohn, O Sasaki, Y Sasaki, G Sauvage, E Sauvan, P Savard, DO Savu, C Sawyer, L Sawyer, DH Saxon, J Saxon, C Sbarra, A Sbrizzi, T Scanlon, DA Scannicchio, M Scarcella, V Scarfone, J Schaarschmidt, P Schacht, D Schaefer, R Schaefer, S Schaepe, S Schaetzel, U Schaefer, AC Schaffer, D Schaile, RD Schamberger, V Scharf, VA Schegelsky, D Scheirich, M Schernau, MI Scherzer, C Schiavi, J Schieck, C Schillo, M Schioppa, S Schlenker, E Schmidt, K Schmieden, C Schmitt, S Schmitt, B Schneider, YJ Schnellbach, U Schnoor, L Schoeffel, A Schoening, BD Schoenrock, ALS Schorlemmer, M Schott, D Schouten, J Schovancova, S Schramm, M Schreyer, C Schroeder, N Schuh, MJ Schultens, H-C Schultz-Coulon, H Schulz, M Schumacher, BA Schumm, P Schune, C Schwanenberger, A Schwartzman, TA Schwarz, P Schwegler, P Schwemling, R Schwienhorst, J Schwindling, T Schwindt, M Schwoerer, FG Sciacca, E Scifo, G Sciolla, WG Scott, F Scuri, F Scutti, J Searcy, G Sedov, E Sedykh, SC Seidel, A Seiden, F Seifert, JM Seixas, G Sekhniaidze, SJ Sekula, KE Selbach, DM Seliverstov, G Sellers, N Semprini-Cesari, C Serfon, L Serin, L Serkin, T Serre, R Seuster, H Severini, T Sfiligoj, F Sforza, A Sfyrla, E Shabalina, M Shamim, LY Shan, R Shang, JT Shank, M Shapiro, PB Shatalov, K Shaw, CY Shehu, P Sherwood, L Shi, S Shimizu, CO Shimmin, M Shimojima, M Shiyakova, A Shmeleva, MJ Shochet, D Short, S Shrestha, E Shulga, MA Shupe, S Shushkevich, P Sicho, O Sidiropoulou, D Sidorov, A Sidoti, F Siegert, D Sijacki, J Silva, Y Silver, D Silverstein, SB Silverstein, V Simak, O Simard, L Simic, S Simion, E Simioni, B Simmons, R Simoniello, M Simonyan, P Sinervo, NB Sinev, V Sipica, G Siragusa, A Sircar, AN Sisakyan, SY Sivoklokov, J Sjolin, TB Sjursen, HP Skottowe, KY Skovpen, P Skubic, M Slater, T Slavicek, K Sliwa, V Smakhtin, BH Smart, L Smestad, SY Smirnov, Y Smirnov, LN Smirnova, O Smirnova, KM Smith, M Smizanska, K Smolek, AA Snesarev, G Snidero, S Snyder, R Sobie, F Socher, A Soffer, DA Soh, CA Solans, M Solar, J Solc, EY Soldatov, U Soldevila, AA Solodkov, A Soloshenko, OV Solovyanov, V Solovyev, P Sommer, HY Song, N Soni, A Sood, A Sopczak, B Sopko, V Sopko, V Sorin, M Sosebee, R Soualah, P Soueid, AM Soukharev, D South, S Spagnolo, F Spano, WR Spearman, F Spettel, R Spighi, G Spigo, LA Spiller, M Spousta, T Spreitzer, B Spurlock, RD St Denis, S Staerz, J Stahlman, R Stamen, S Stamm, E Stanecka, RW Stanek, C Stanescu, M Stanescu-Bellu, MM Stanitzki, S Stapnes, EA Starchenko, J Stark, P Staroba, P Starovoitov, R Staszewski, P Stavina, P Steinberg, B Stelzer, HJ Stelzer, O Stelzer-Chilton, H Stenzel, S Stern, GA Stewart, JA Stillings, MC Stockton, M Stoebe, G Stoicea, P Stolte, S Stonjek, AR Stradling, A Straessner, ME Stramaglia, J Strandberg, S Strandberg, A Strandlie, E Strauss, M Strauss, P Strizenec, R Stroehmer, DM Strom, R Stroynowski, A Struebig, SA Stucci, B Stugu, NA Styles, D Su, J Su, R Subramaniam, A Succurro, Y Sugaya, C Suhr, M Suk, VV Sulin, S Sultansoy, T Sumida, S Sun, X Sun, JE Sundermann, K Suruliz, G Susinno, MR Sutton, Y Suzuki, M Svatos, S Swedish, M Swiatlowski, I Sykora, T Sykora, D Ta, C Taccini, K Tackmann, J Taenzer, A Taffard, R Tafirout, N Taiblum, H Takai, R Takashima, H Takeda, T Takeshita, Y Takubo, M Talby, AA Talyshev, JYC Tam, KG Tan, J Tanaka, R Tanaka, S Tanaka, S Tanaka, AJ Tanasijczuk, BB Tannenwald, N Tannoury, S Tapprogge, S Tarem, F Tarrade, GF Tartarelli, P Tas, M Tasevsky, T Tashiro, E Tassi, A Tavares Delgado, Y Tayalati, FE Taylor, GN Taylor, W Taylor, FA Teischinger, MTD Castanheira, P Teixeira-Dias, KK Temming, H Ten Kate, PK Teng, JJ Teoh, S Terada, K Terashi, J Terron, S Terzo, M Testa, RJ Teuscher, J Therhaag, T Theveneaux-Pelzer, JP Thomas, J Thomas-Wilsker, EN Thompson, PD Thompson, PD Thompson, RJ Thompson, AS Thompson, LA Thomsen, E Thomson, M Thomson, WM Thong, RP Thun, F Tian, MJ Tibbetts, VO Tikhomirov, YA Tikhonov, S Timoshenko, E Tiouchichine, P Tipton, S Tisserant, T Todorov, S Todorova-Nova, B Toggerson, J Tojo, S Tokar, K Tokushuku, K Tollefson, L Tomlinson, M Tomoto, L Tompkins, K Toms, ND Topilin, E Torrence, H Torres, E Torro Pastor, J Toth, F Touchard, DR Tovey, HL Tran, T Trefzger, L Tremblet, A Tricoli, IM Trigger, S Trincaz-Duvoid, MF Tripiana, W Trischuk, B Trocme, C Troncon, M Trottier-McDonald, M Trovatelli, P True, M Trzebinski, A Trzupek, C Tsarouchas, JC-L Tseng, PV Tsiareshka, D Tsionou, G Tsipolitis, N Tsirintanis, S Tsiskaridze, V Tsiskaridze, EG Tskhadadze, II Tsukerman, V Tsulaia, S Tsuno, D Tsybychev, A Tudorache, V Tudorache, AN Tuna, SA Tupputi, S Turchikhin, D Turecek, IT Cakir, R Turra, PM Tuts, A Tykhonov, M Tylmad, M Tyndel, K Uchida, I Ueda, R Ueno, M Ughetto, M Ugland, M Uhlenbrock, F Ukegawa, G Unal, A Undrus, G Unel, FC Ungaro, Y Unno, C Unverdorben, D Urbaniec, P Urquijo, G Usai, A Usanova, L Vacavant, V Vacek, B Vachon, N Valencic, S Valentinetti, A Valero, L Valery, S Valkar, E Valladolid Gallego, S Vallecorsa, JA Valls Ferrer, W Van den Wollenberg, PC Van der Deijl, R van der Geer, H van der Graaf, R Van der Leeuw, D van der Ster, N van Eldik, P van Gemmeren, J Van Nieuwkoop, I van Vulpen, MC van Woerden, M Vanadia, W Vandelli, R Vanguri, A Vaniachine, P Vankov, F Vannucci, G Vardanyan, R Vari, EW Varnes, T Varol, D Varouchas, A Vartapetian, KE Varvell, F Vazeille, TV Schroeder, J Veatch, F Veloso, S Veneziano, A Ventura, D Ventura, M Venturi, N Venturi, A Venturini, V Vercesi, M Verducci, W Verkerke, JC Vermeulen, A Vest, MC Vetterli, O Viazlo, I Vichou, T Vickey, OEV Boeriu, GHA Viehhauser, S Viel, R Vigne, M Villa, MV Perez, E Vilucchi, MG Vincter, VB Vinogradov, J Virzi, I Vivarelli, FV Vaque, S Vlachos, D Vladoiu, M Vlasak, A Vogel, M Vogel, P Vokac, G Volpi, M Volpi, H von der Schmitt, H von Radziewski, E von Toerne, V Vorobel, K Vorobev, M Vos, R Voss, JH Vossebeld, N Vranjes, MV Milosavljevic, V Vrba, M Vreeswijk, TV Anh, R Vuillermet, I Vukotic, Z Vykydal, P Wagner, W Wagner, H Wahlberg, S Wahrmund, J Wakabayashi, J Walder, R Walker, W Walkowiak, R Wall, P Waller, B Walsh, C Wang, C Wang, F Wang, H Wang, H Wang, J Wang, J Wang, K Wang, R Wang, SM Wang, T Wang, X Wang, C Wanotayaroj, A Warburton, CP Ward, DR Wardrope, M Warsinsky, A Washbrook, C Wasicki, PM Watkins, AT Watson, IJ Watson, MF Watson, G Watts, S Watts, BM Waugh, S Webb, MS Weber, SW Weber, JS Webster, AR Weidberg, P Weigell, B Weinert, J Weingarten, C Weiser, H Weits, PS Wells, T Wenaus, D Wendland, Z Weng, T Wengler, S Wenig, N Wermes, M Werner, P Werner, M Wessels, J Wetter, K Whalen, A White, MJ White, R White, S White, D Whiteson, D Wicke, FJ Wickens, W Wiedenmann, M Wielers, P Wienemann, C Wiglesworth, LAM Wiik-Fuchs, PA Wijeratne, A Wildauer, MA Wildt, HG Wilkens, JZ Will, HH Williams, S Williams, C Willis, S Willocq, A Wilson, JA Wilson, I Wingerter-Seez, F Winklmeier, BT Winter, M Wittgen, T Wittig, J Wittkowski, SJ Wollstadt, MW Wolter, H Wolters, BK Wosiek, J Wotschack, MJ Woudstra, KW Wozniak, M Wright, M Wu, SL Wu, X Wu, Y Wu, E Wulf, TR Wyatt, BM Wynne, S Xella, M Xiao, D Xu, L Xu, B Yabsley, S Yacoob, R Yakabe, M Yamada, H Yamaguchi, Y Yamaguchi, A Yamamoto, K Yamamoto, S Yamamoto, T Yamamura, T Yamanaka, K Yamauchi, Y Yamazaki, Z Yan, H Yang, H Yang, UK Yang, Y Yang, S Yanush, L Yao, W-M Yao, Y Yasu, E Yatsenko, KHY Wong, J Ye, S Ye, I Yeletskikh, AL Yen, E Yildirim, M Yilmaz, R Yoosoofmiya, K Yorita, R Yoshida, K Yoshihara, C Young, CJS Young, S Youssef, DR Yu, J Yu, JM Yu, J Yu, L Yuan, A Yurkewicz, I Yusuff, B Zabinski, R Zaidan, AM Zaitsev, A Zaman, S Zambito, L Zanello, D Zanzi, C Zeitnitz, M Zeman, A Zemla, K Zengel, O Zenin, T Zenis, D Zerwas, GZ della Porta, D Zhang, F Zhang, H Zhang, J Zhang, L Zhang, X Zhang, Z Zhang, Z Zhao, A Zhemchugov, J Zhong, B Zhou, L Zhou, N Zhou, CG Zhu, H Zhu, J Zhu, Y Zhu, X Zhuang, K Zhukov, A Zibell, D Zieminska, NI Zimine, C Zimmermann, R Zimmermann, S Zimmermann, S Zimmermann, Z Zinonos, M Ziolkowski, G Zobernig, A Zoccoli, M zur Nedden, G Zurzolo, V Zutshi, L Zwalinski, ATLAS Collaboration


Plans for the Phase II upgrade to the ATLAS detector

JOURNAL OF INSTRUMENTATION 9 (2014) ARTN C02033

BT Huffman, ATLAS Collaboration


ATLAS Collaboration

Nuclear Physics A 932 (2014) 572-594

G Aad, T Abajyan, B Abbott, J Abdallah, S Abdel Khalek, O Abdinov, R Aben, B Abi, OS AbouZeid, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, J Adelman, S Adomeit, T Adye, T Agatonovic-Jovin, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, F Ahmadov, G Aielli, TPA Åkesson, G Akimoto, AV Akimov, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, G Alimonti, L Alio, J Alison, BMM Allbrooke, LJ Allison, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, C Alpigiani, A Altheimer, B Alvarez Gonzalez, MG Alviggi, Y Amaral Coutinho, C Amelung, SP Amor Dos Santos, S Amoroso, N Amram, G Amundsen, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, S Angelidakis, P Anger, A Angerami, AV Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, JF Arguin, S Argyropoulos, M Arik, AJ Armbruster, O Arnaez, V Arnal, O Arslan, A Artamonov, G Artoni, S Asai, N Asbah, A Ashkenazi, B Åsman


Summary of the effects of radiation upon the passive optical components of the Versatile Link

JOURNAL OF INSTRUMENTATION 9 (2014) ARTN C01018

BT Huffman, A Weidberg


Further studies of the effect of radiation on the mechanical strength of optical fibres

JOURNAL OF INSTRUMENTATION 8 (2013) ARTN P12002

BT Huffman, PK Teng, AR Weidberg


Measurements of Higgs boson production and couplings in diboson final states with the ATLAS detector at the LHC

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 726 (2013) 88-119

G Aad, T Abajyan, B Abbott, J Abdallah, S AbdelKhalek, O Abdinov, R Aben, B Abi, M Abolins, OS AbouZeid, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, L Adamczyk, DL Adams, TN Addy, J Adelman, S Adomeit, T Adye, S Aefsky, JA Aguilar-Saavedra, M Agustoni, SP Ahlen, A Ahmad, M Ahsan, G Aielli, TPA Åkesson, G Akimoto, AV Akimov, MA Alam, J Albert, S Albrand, MJ Alconada Verzini, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, L Alio, J Alison, BMM Allbrooke, LJ Allison, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, F Alonso, A Altheimer, B Alvarez Gonzalez, MG Alviggi, K Amako, Y Amaral Coutinho, C Amelung, VV Ammosov, SP Amor Dos Santos, A Amorim, S Amoroso, N Amram, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, G Anders, KJ Anderson, A Andreazza, V Andrei, XS Anduaga, S Angelidakis, P Anger, A Angerami, F Anghinolfi, AV Anisenkov, N Anjos, A Annovi, A Antonaki, M Antonelli, A Antonov, J Antos, F Anulli, M Aoki, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, S Arfaoui, JF Arguin, S Argyropoulos, E Arik, M Arik

Measurements are presented of production properties and couplings of the recently discovered Higgs boson using the decays into boson pairs, H→γγ, H→ZZ*→4ℓ and H→WW*→ℓνℓν. The results are based on the complete pp collision data sample recorded by the ATLAS experiment at the CERN Large Hadron Collider at centre-of-mass energies of s=7 TeV and s=8 TeV, corresponding to an integrated luminosity of about 25 fb-1. Evidence for Higgs boson production through vector-boson fusion is reported. Results of combined fits probing Higgs boson couplings to fermions and bosons, as well as anomalous contributions to loop-induced production and decay modes, are presented. All measurements are consistent with expectations for the Standard Model Higgs boson. © 2013 CERN.


A study of the effect of radiation on the mechanical strength of optical fibres

JOURNAL OF INSTRUMENTATION 8 (2013) ARTN P05011

B Arvidsson, V Cindro, BT Huffman, C Issever, PK Teng, AR Weidberg, JA Wilson

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