Measurement of the production cross section for a W boson and two b jets in pp collisions at √s=7 TeV

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Wulz, C. -E. and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Béni, Noémi Tekla and Molnár, József and Pálinkás, József and Szillási, Zoltán and Karancsi, János and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2014) Measurement of the production cross section for a W boson and two b jets in pp collisions at √s=7 TeV. PHYSICS LETTERS B, 735. pp. 204-225. ISSN 0370-2693

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Abstract

The production cross section for a W boson and two b jets is measured using proton- proton collisions at √s = 7 TeV in a data sample collected with the CMS experiment at the LHC corresponding to an integrated luminosity of 5.0 fb−1. The W + bb events are selected in the W → μν decay mode by requiring a muon with transverse momentum pT > 25 GeV and pseudorapidity |η| < 2.1, and exactly two b-tagged jets with pT > 25 GeV and |η| < 2.4. The measured W + bb production cross section in the fiducial region, calculated at the level of final-state particles, is σ(pp → W + bb) × B(W → μν) = 0.53 ± 0.05 (stat) ± 0.09 (syst) ± 0.06 (theo.) ± 0.01 (lumi) pb, in agreement with the standard model prediction. In addition, kinematic distributions of the W + bb system are in agreement with the predictions of a simulation using MADGRAPH and PYTHIA.

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