Babak Abi

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Babak Abi

Postdoctoral Research Assistant

My research interest is testing the standard model of particle physics through precision measurement of standard model (SM) predictions and searches for new phenomena.
I am involved in G-2 experiment that is currently under upgrade in FermiLab based on the original set-up from BNL.
The muon's g-factor is sensitive to contributions from new physics beyond the Standard Model and it can be used as a probe for new physics beyond the Standard Model. Our group in Oxford is responsible to design and construct in-situ 3He NMR magnetometer to measure the magnetic field in G-2 along side the water based probes to reduce systematic error.

Previously I was involved in the Physics of Top quark at the ATLAS experiment at CERN. ATLAS is one of leading high energy physics experiments with large collaborations consisting of more than 3000 scientist. Also I was involved in the ATLAS pixel detector Optolink upgrade for SLHC.
I was involved with four Physics analysis in Top physics sector and led two of them to produce physics results for ATLAS. I led two analyses that were based on two measurements of the top quark pair cross section with the ATLAS detector. I performed the inclusive ttbar cross section measurement using data taken by ATLAS in lepton+jets channel. That was the most accurate result in that time obtained without applying b-tagging algorithms. It has been selected by ATLAS together with another result obtained with b-tagging on the same dataset to be published from much competitor analysis. I also measured the production cross section of ttbar pairs produced in association with additional jets. This was the first measurement of this kind at LHC. I did both analyses using advanced multivariate and statistical technique and likelihood template fit method.

Publications with my contribution (primary Author) :

1. Measurement of the top quark pair production cross-section with ATLAS in the single lepton channel. ATLAS Collaboration Phys.Lett. B711 (2012) 244-263

2. Measurement of the top quark pair production cross-section with ATLAS in pp collisions at √s = 7 TeV ATLAS Collaboration EPJC 71 (2011) 1577

3. Top quark pair production Cross Section in ATLAS with early data. B. Abi Proceedings of Conference HCP2010, ATL-PHYS-PROC-2010-83 arXiv:1010.0148

4. Study of the Radiation Hardness Performance of PiN diodes for the ATLAS Pixel Detector at the SLHC upgrade. B.Abi Proceedings of Conference TWEPP09 CERN-2009-006 (2009) p. 390

5. Study of the Radiation Hardness of VCSEL and PIN Arrays. K.K. Gan , B. Abi et al. Proceedings of Conference 10th ICATPP, arXiv:0901.0727 [physics.ins-det]

6. Radiation-hard/high-speed data transmission using optical links. K.K. Gan , B. Abi et al. Nucl.Phys.Proc.Suppl. 197 (2009) 175-179

7. Radiation-Hard/High-Speed Data Transmission using Optical-Links K.K. Gan , B. Abi et al. Nuclear Instruments and Methods in Physics Research A 607 (2009) 240–243

8. Study of the radiation-hardness of VCSEL and PIN. K.K. Gan , B. Abi et al. PoS RD09 (2009) 041

9. Radiation-hard optical link for SLHC. K.K. Gan , B. Abi et al. J.Phys.Conf.Ser. 110 (2008) 092011

10. The ATLAS Experiment at the CERN Large Hadron Collider. ATLAS Collaboration JINST 3 (2008) S08003

ATLAS Conference Notes

11. Top Quark Pair Production Cross-section Measurement in ATLAS in the Single Lepton+Jets Channel without b-tagging. ATLAS Collaboration ATLAS-CONF-2011-023

12. Reconstructed jet multiplicities from the top-quark pair decays and associated jets in pp collisions at √s = 7 TeV measured with the ATLAS detector at the LHC. ATLAS Collaboration ATLAS-CONF-2011-142

13. Measurement of the cross section in tt̄+jets using kinematics fit method with the ATLAS detector. ATLAS Collaboration ATLAS-CONF-2012-083

14. Background studies for top-pair production in lepton plus jets final states in √s=7 TeV ATLAS data. ATLAS Collaboration ATLAS-CONF-2010-087

15. Measurement of the top quark pair production cross section in the single-lepton channel with ATLAS in proton-proton collisions at 8 TeV using kinematic fits with b-tagging. ATLAS Collaboration Atlas-conf-2012-149

16. Supporting Document: Invariant mass distribution of jet pairs produced in association with one lepton and missing transverse energy at the ATLAS experiment. ATL-COM-PHYS-2011-396.- Geneva : CERN, 2011 - 16 p.

17. Mis-identified lepton backgrounds to top quark pair production for Moriond 2011 analysis. ATL-COM-PHYS-2011-144.- Geneva : CERN, 2011 - 29 p.

18. Reconstructed jet multiplicities from the top-quark pair decays and associated jets in pp collisions at √s = 7 TeV measured with the ATLAS detector at the LHC. ATLAS-CONF-2011-142

ATLAS Internal Notes

19. Mis-identified lepton backgrounds to top quark pair production. Abi, B ; Adelman, J et al. ATL-PHYS-INT-2010-139.- Geneva : CERN, 2010 - 62 p.

20. Prospects of measurement of ttˉ inclusive cross-section using the likelihood template method with early ATLAS data at √s=10 TeV. Abi, B et al ATL-PHYS-INT-2010-003.- Geneva : CERN, 2010

21. Measurements of the top pair production cross-section in 8 TeV proton-proton collisions using kinematic information. ATLAS Collaboration ATLAS-COM-PHYS-2012-1140

Conferences talks and presentations:

1. “Measurement of the cross section in ttˉ+ jets using a multivariate kinematics fit method with the ATLAS detector” American Physical Society (APS) April Meeting 2012, March 31 - April 3, Atlanta, GA, USA.

2. ”Measurement of the top quark pair production cross section with early ATLAS data” American Physical Society (APS) April Meeting 2011, April 30–May 3 2011, Anaheim, California, USA.

3. “Measurement of the ttˉ plus jets cross section with the ATLAS Detector” US ATLAS Physics Meeting (Aug. 15 - 17, 2011), Boston University, Boston, Massachusetts, USA.

4. “Measurement of the ttˉ plus jets cross section with the ATLAS Detector” US ATLAS Analysis Jamboree, Oct 2011, Brookhaven National Laboratory (BNL), New York, USA.

5. “Results from top Cross-section measurement at ATLAS with 2010 data”, ATLAS Physics Jamboree, (Apr 15 - 17, 2011), University of Taxes, Arlington, USA

6. “Study of measurement of the ttˉ cross section in the electron + jets channel at ATLAS using kinematic information” American Physical Society (APS) April Meeting 2010, February 13–16, Washington, DC, USA.

7. “Top quark pair cross section measurement using kinematics information”, Fourth ATLAS Physics workshop of all Americas , University of Texas at Arlington Agust 9-11 2010

8. “Top quark pair production Cross Section in ATLAS with early” The Hadron Collider Physics Symposium 2010, August 23-27, University of Toronto, Toronto, Canada

9. “Study Radiation Hardness Performance of PiN diodes for the ATLAS Pixel Detector at SLHC” Topical Workshop on Electronics for Particle Physics (TWEPP-09) 2009, September 21-25, Paris, France

10. “Study of measurement of the ttbar cross section in the electron + jets channel using kinematic information” US ATLAS Analysis Jamboree, Nov 2009, Brookhaven National Laboratory (BNL), New York, USA.

11. “Study of the radiation hardness of PiN diodes for Atlas pixel detector” Topical Workshop on Electronics for Particle Physics (TWEPP-08), 2008, Naxos – Greece