First measurement of the charge asymmetry in beauty-quark pair production at a hadron collider release_bx2npioq5zfsfone4j6c4z6mtu

by R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves Jr (+661 others)

Released as a report .

2014  

Abstract

The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in bb̅ pair production at a hadron collider. The data used correspond to an integrated luminosity of 1.0fb^-1 collected at 7TeV center-of-mass energy in proton-proton collisions with the LHCb detector. The measurement is performed in three regions of the invariant mass of the bb̅ system. The results obtained are: A_C^bb̅(40 < M_bb̅ < 75 GeV/c^2) &=& 0.4 ± 0.4(stat) ± 0.3(syst)% A_C^bb̅(75 < M_bb̅ < 105 GeV/c^2) &=& 2.0 ± 0.9(stat) ± 0.6(syst)% A_C^bb̅(M_bb̅ > 105 GeV/c^2) &=&1.6 ± 1.7(stat) ± 0.6(syst)% where A_C^bb̅ is defined as the asymmetry in the difference in rapidity between jets formed from the beauty quark and antiquark. The beauty jets are required to satisfy 2<η<4, E_ T > 20GeV, and have an opening angle in the transverse plane Δϕ>2.6rad. These measurements are consistent with the predictions of the Standard Model.
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Type  report
Stage   accepted
Date   2014-09-13
Version   v2
Language   en ?
Number  CERN-PH-EP-2014-130, LHCb-PAPER-2014-023
arXiv  1406.4789v2
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