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Measurement of the production cross section of prompt J/psi mesons in association with a W boson in pp collisions at sqrt{s}=7 TeV with the ATLAS detector

ArXiv 1401.2831 (2014)
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Observation of the associated production of a single top quark and a W boson in pp collisions at sqrt(s) = 8 TeV

ArXiv 1401.2942 (2014)
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Summary of the effects of radiation upon the passive optical components of the Versatile Link

JOURNAL OF INSTRUMENTATION 9 (2014) ARTN C01018

Authors:

BT Huffman, A Weidberg
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ATLAS strip detector: Operational experience and run 1-> run 2 transition

Proceedings of Science 15-19-September-2014 (2014)

Abstract:

The Large hadron collider was operated very successfully during the Run 1 and provided a lot of opportunities of physics studies. It currently has a consolidation work toward the operation at √s = 14 TeV in Run 2. The ATLAS experiment has achieved excellent performance in Run 1 operation, delivering remarkable physics results. The SemiConductor Tracker contributed to the precise measurement of momentum of charged particles. This paper describes the operation experience of the SemiConductor Tracker in Run 1 and the preparation toward the Run 2 operation during the long shutdown 1.

Determination of the top-quark pole mass and strong coupling constant from the tt̄ production cross section in pp collisions at √s = 7 TeV

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 728:1 (2014) 496-517

Authors:

S Chatrchyan, V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Erö, C Fabjan, M Friedl, R Frühwirth, VM Ghete, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, V Knünz, M Krammer, I Krätschmer, D Liko, I Mikulec, D Rabady, B Rahbaran, H Rohringer, R Schöfbeck, J Strauss, A Taurok, W Treberer-Treberspurg, W Waltenberger, CE Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Alderweireldt, M Bansal, S Bansal, T Cornelis, EA De Wolf, X Janssen, A Knutsson, S Luyckx, L Mucibello, S Ochesanu, B Roland, R Rougny, Z Staykova, H Van Haevermaet, P Van Mechelen, N Van Remortel, A Van Spilbeeck, F Blekman, S Blyweert, J D'Hondt, N Heracleous, A Kalogeropoulos, J Keaveney, S Lowette, M Maes, A Olbrechts, S Tavernier, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, C Caillol, B Clerbaux, G De Lentdecker, L Favart, APR Gay, T Hreus, A Léonard, PE Marage, A Mohammadi, L Perniè, T Reis, T Seva, L Thomas, C Vander Velde, P Vanlaer, J Wang, V Adler, K Beernaert, L Benucci, A Cimmino, S Costantini, S Dildick, G Garcia, B Klein, J Lellouch, A Marinov, J Mccartin, AA Ocampo Rios, D Ryckbosch, M Sigamani

Abstract:

The inclusive cross section for top-quark pair production measured by the CMS experiment in proton-proton collisions at a center-of-mass energy of 7 TeV is compared to the QCD prediction at next-to-next-to-leading order with various parton distribution functions to determine the top-quark pole mass, m t pole , or the strong coupling constant, α S . With the parton distribution function set NNPDF2.3, a pole mass of 176. 7 +3.8 -3.4 GeV is obtained when constraining α S at the scale of the Z boson mass, m Z , to the current world average. Alternatively, by constraining m t pole to the latest average from direct mass measurements, a value of α S (m Z ) = 0. 1151 +0.0033 -0.0032 is extracted. This is the first determination of α S using events from top-quark production. © 2013 The Authors. Published by Elsevier B.V.
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