Probing Nuclear Effects with Neutrino-Induced Charged-Current Neutral Pion Production

Physical Review D (0)

X Lu, G Barr, D Wark, A Weber

Measurement of the $ν_μ$ charged-current cross sections on water, hydrocarbon, iron, and their ratios with the T2K on-axis detectors


K Abe, T Campbell, S Cao, SL Cartwright, A Cervera, N Dokania, S Dolan, O Drapier, KE Duffy, J Dumarchez, P Dunne, R Fujita, JT Haigh, M Hogan, J Holeczek, NTH Van, F Hosomi, AK Ichikawa, M Ikeda, A Izmaylov, B Jamieson, C Jesus, M Jiang

We report a measurement of the flux-integrated $\nu_{\mu}$ charged-current cross sections on water, hydrocarbon, and iron in the T2K on-axis neutrino beam with a mean neutrino energy of 1.5 GeV. The measured cross sections on water, hydrocarbon, and iron are $\sigma^{\rm{H_{2}O}}_{\rm{CC}}$ = (0.840$\pm 0.010$(stat.)$^{+0.10}_{-0.08}$(syst.))$\times$10$^{-38}$cm$^2$/nucleon, $\sigma^{\rm{CH}}_{\rm{CC}}$ = (0.817$\pm 0.007$(stat.)$^{+0.11}_{-0.08}$(syst.))$\times$10$^{-38}$cm$^2$/nucleon, and $\sigma^{\rm{Fe}}_{\rm{CC}}$ = (0.859$\pm 0.003$(stat.) $^{+0.12}_{-0.10}$(syst.))$\times$10$^{-38}$cm$^2$/nucleon respectively, for a restricted phase space of induced muons: $\theta_{\mu}<45^{\circ}$ and $p_{\mu}>$0.4 GeV/$c$ in the laboratory frame. The measured cross section ratios are ${\sigma^{\rm{H_{2}O}}_{\rm{CC}}}/{\sigma^{\rm{CH}}_{\rm{CC}}}$ = 1.028$\pm 0.016$(stat.)$\pm 0.053$(syst.), ${\sigma^{\rm{Fe}}_{\rm{CC}}}/{\sigma^{\rm{H_{2}O}}_{\rm{CC}}}$ = 1.023$\pm 0.012$(stat.)$\pm 0.058$(syst.), and ${\sigma^{\rm{Fe}}_{\rm{CC}}}/{\sigma^{\rm{CH}}_{\rm{CC}}}$ = 1.049$\pm 0.010$(stat.)$\pm 0.043$(syst.). These results, with an unprecedented precision for the measurements of neutrino cross sections on water in the studied energy region, show good agreement with the current neutrino interaction models used in the T2K oscillation analyses.

Optimisation of the scintillation light collection and uniformity for the SoLid experiment

Journal of Instrumentation IOP Publishing (0)

Y Abreu, Y Amhis, W Beaumont, M Bongrand, D Boursette, BC Castle, K Clark, B Coupé, D Cussans, AD Roeck, D Durand, M Fallot, L Ghys, L Giot, K Graves, B Guillon, D Henaff, B Hosseini, S Ihantola, S Jenzer, S Kalcheva, LN Kalousis, M Labare, G Lehaut, S Manley, L Manzanillas, J Mermans, I Michiels, C Moortgat, D Newbold, J Park, V Pestel, K Petridis, I Piñera, L Popescu, D Ryckbosch, N Ryder, D Saunders, M-H Schune, M Settimo, L Simard, A Vacheret, G Vandierendonck, SV Dyck, PV Mulders, NV Remortel, S Vercaemer, M Verstraeten, B Viaud, A Weber, F Yermia

This paper presents a comprehensive optimisation study to maximise the light collection efficiency of scintillating cube elements used in the SoLid detector. Very short baseline reactor experiments, like SoLid, look for active to sterile neutrino oscillation signatures in the anti-neutrino energy spectrum as a function of the distance to the core and energy. Performing a precise search requires high light yield of the scintillating elements and uniformity of the response in the detector volume. The SoLid experiment uses an innovative hybrid technology with two different scintillators: polyvinyltoluene scintillator cubes and $^6$LiF:ZnS(Ag) screens. A precision test bench based on a $^{207}$Bi calibration source has been developed to study improvements on the energy resolution and uniformity of the prompt scintillation signal of antineutrino interactions. A trigger system selecting the 1~MeV conversion electrons provides a Gaussian energy peak and allows for precise comparisons of the different detector configurations that were considered to improve the SoLid detector light collection. The light collection efficiency is influenced by the choice of wrapping material, the position of the $^6$LiF:ZnS(Ag) screen, the type of fibre, the number of optical fibres and the type of mirror at the end of the fibre. This study shows that large gains in light collection efficiency are possible compared to the SoLid SM1 prototype. The light yield for the SoLid detector is expected to be at least 52$\pm$2 photo-avalanches per MeV per cube, with a relative non-uniformity of 6 %, demonstrating that the required energy resolution of at least 14 % at 1 MeV can be achieved.

Optimised sensitivity to leptonic CP violation from spectral information: the LBNO case at 2300 km baseline

arXiv (0)

LAGUNA-LBNO Collaboration, SK Agarwalla, L Agostino, M Aittola, A Alekou, B Andrieu, F Antoniou, R Asfandiyarov, D Autiero, O Bésida, A Balik, P Ballett, I Bandac, D Banerjee, W Bartmann, F Bay, B Biskup, AM Blebea-Apostu, A Blondel, M Bogomilov, S Bolognesi, E Borriello, I Brancus, A Bravar, M Buizza-Avanzini, D Caiulo, M Calin, M Calviani, M Campanelli, C Cantini, G Cata-Danil, S Chakraborty, N Charitonidis, L Chaussard, D Chesneanu, F Chipesiu, P Crivelli, J Dawson, ID Bonis, Y Declais, PDA Sanchez, A Delbart, SD Luise, D Duchesneau, J Dumarchez, I Efthymiopoulos, A Eliseev, S Emery, T Enqvist, K Enqvist, L Epprecht, AN Erykalov, T Esanu, D Franco, M Friend, V Galymov, G Gavrilov, A Gendotti, C Giganti, S Gilardoni, B Goddard, CM Gomoiu, YA Gornushkin, P Gorodetzky, A Haesler, T Hasegawa, S Horikawa, K Huitu, A Izmaylov, A Jipa, K Kainulainen, Y Karadzhov, M Khabibullin, A Khotjantsev, AN Kopylov, A Korzenev, S Kosyanenko, D Kryn, Y Kudenko, P Kuusiniemi, I Lazanu, C Lazaridis, J-M Levy, K Loo, J Maalampi, RM Margineanu, J Marteau, C Martin-Mari, V Matveev, E Mazzucato, A Mefodiev, O Mineev, A Mirizzi, B Mitrica, S Murphy, T Nakadaira, S Narita, DA Nesterenko, K Nguyen, K Nikolics, E Noah, Y Novikov, A Oprima, J Osborne, T Ovsyannikova, Y Papaphilippou, S Pascoli, T Patzak, M Pectu, E Pennacchio, L Periale, H Pessard, B Popov, M Ravonel, M Rayner, F Resnati, O Ristea, A Robert, A Rubbia, K Rummukainen, A Saftoiu, K Sakashita, F Sanchez-Galan, J Sarkamo, N Saviano, E Scantamburlo, F Sergiampietri, D Sgalaberna, E Shaposhnikova, M Slupecki, D Smargianaki, D Stanca, R Steerenberg, AR Sterian, P Sterian, S Stoica, C Strabel, J Suhonen, V Suvorov, G Toma, A Tonazzo, WH Trzaska, R Tsenov, K Tuominen, M Valram, G Vankova-Kirilova, F Vannucci, G Vasseur, F Velotti, P Velten, V Venturi, T Viant, S Vihonen, H Vincke, A Vorobyev, A Weber, S Wu, N Yershov, L Zambelli, M Zito

One of the main goals of the Long Baseline Neutrino Observatory (LBNO) is to study the $L/E$ behaviour (spectral information) of the electron neutrino and antineutrino appearance probabilities, in order to determine the unknown CP-violation phase $\delta_{CP}$ and discover CP-violation in the leptonic sector. The result is based on the measurement of the appearance probabilities in a broad range of energies, covering t he 1st and 2nd oscillation maxima, at a very long baseline of 2300 km. The sensitivity of the experiment can be maximised by optimising the energy spectra of the neutrino and anti-neutrino fluxes. Such an optimisation requires exploring an extended range of parameters describing in details the geometries and properties of the primary protons, hadron target and focusing elements in the neutrino beam line. In this paper we present a numerical solution that leads to an optimised energy spectra and study its impact on the sensitivity of LBNO to discover leptonic CP violation. In the optimised flux both 1st and 2nd oscillation maxima play an important role in the CP sensitivity. The studies also show that this configuration is less sensitive to systematic errors (e.g. on the total event rates) than an experiment which mainly relies on the neutrino-antineutrino asymmetry at the 1st maximum to determine the existence of CP-violation.

Treatment of flux shape uncertainties in unfolded, flux-averaged neutrino cross-section measurements

ArXiv (0)

L Koch, S Dolan

The exact way of treating flux shape uncertainties in unfolded, flux-averaged neutrino cross-section measurements can lead to subtle issues when comparing the results to model predictions. There is a difference between reporting a cross section in the (unknown) real flux, and reporting a cross section that was extrapolated from the (unknown) real flux to a fixed reference flux. A lot of (most?) current analyses do the former, while the results are compared to model predictions as if they were the latter. This leads to (part of) the flux shape uncertainty being ignored, potentially leading to wrong physics conclusions. The size of the effect is estimated to be sub-dominant, but non-negligible in two example measurements from T2K and MINERvA. This paper describes how the issue arises and provides instructions for possible ways how to treat the flux shape uncertainties correctly.

SoLid: A short baseline reactor neutrino experiment

ArXiv (0)

S Collaboration, Y Abreu, Y Amhis, L Arnold, G Barber, W Beaumont, S Binet, I Bolognino, M Bongrand, J Borg, D Boursette, V Buridon, BC Castle, H Chanal, K Clark, B Coupe, P Crochet, D Cussans, AD Roeck, D Durand, T Durkin, M Fallot, L Ghys, L Giot, K Graves, B Guillon, D Henaff, B Hosseini, S Jenzer, S Kalcheva, LN Kalousis, M Labare, G Lehaut, S Manley, L Manzanillas, J Mermans, I Michiels, S Monteil, C Moortgat, D Newbold, V Pestel, K Petridis, I Pinera, L Popescu, N Roy, D Ryckbosch, N Ryder, D Saunders, M-H Schune, M Settimo, HR Sfar, L Simard, A Vacheret, G Vandierendonck, SV Dyck, PV Mulders, NV Remortel, S Vercaemer, M Verstraeten, B Viaud, A Weber, F Yermia

The SoLid experiment, short for Search for Oscillations with a Lithium 6 detector, is a new generation neutrino experiment which addresses the key challenges for high precision reactor neutrino measurements at very short distances and with little or no overburden. The primary goal of the SoLid experiment is to search for very short distance neutrino oscillations as a probe of eV-scale sterile neutrinos. This paper describes the SoLid detection principle, the mechanical design and the construction of the detector. It then reports on the installation and commissioning on site near the BR2 reactor, Belgium, and finally highlights its performance in terms of detector response and calibration.

TITUS: the Tokai Intermediate Tank for the Unoscillated Spectrum

arXiv (0)

C Andreopoulos, FCT Barbato, G Barker, G Barr, P Beltrame, V Berardi, T Berry, A Blondel, S Boyd, A Bravar, FS Cafagna, S Cartwright, MG Catanesi, C Checchia, A Cole, G Collazuol, GA Cowan, T Davenne, T Dealtry, C Densham, GD Rosa, FD Lodovico, E Drakopoulou, P Dunne, A Finch, M Fitton, D Hadley, K Hayrapetyan, RA Intonti, P Jonsson, A Kaboth, T Katori, L Kormos, Y Kudenko, J Lagoda, P Lasorak, M Laveder, M Lawe, P Litchfield, A Longhin, L Ludovici, W Ma, L Magaletti, M Malek, N McCauley, M Mezzetto, J Monroe, T Nicholls, M Needham, E Noah, F Nova, HM O'Keeffe, A Owen, V Palladino, D Payne, J Perkin, S Playfer, A Pritchard, N Prouse, E Radicioni, M Rayner, C Riccio, B Richards, J Rose, AC Ruggeri, R Shah, Y Shitov, C Simpson, G Sidiropoulos, T Stewart, R Terri, L Thompson, M Thorpe, Y Uchida, D Wark, MO Wascko, A Weber, JR Wilson

The TITUS, Tokai Intermediate Tank for Unoscillated Spectrum, detector, is a proposed Gd-doped Water Cherenkov tank with a magnetised muon range detector downstream. It is located at J-PARC at about 2 km from the neutrino target and it is proposed as a potential near detector for the Hyper-Kamiokande experiment. Assuming a beam power of 1.3 MW and 27.05 x 10^{21} protons-on-target the sensitivity to CP and mixing parameters achieved by Hyper-Kamiokande with TITUS as a near detector is presented. Also, the potential of the detector for cross sections and Standard Model parameter determination, supernova neutrino and dark matter are shown.