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First measurement of the charge asymmetry in beauty-quark pair production


LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Serra, N; Vollhardt, A; et al (2014). First measurement of the charge asymmetry in beauty-quark pair production. Physical Review Letters, 113(082003):online.

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 bb¯ 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 bb¯ system. The results obtained are:
Abb¯C(40<Mbb¯<75GeV/c2)Abb¯C(75<Mbb¯<105GeV/c2)Abb¯C(Mbb¯>105GeV/c2)===0.4±0.4(stat)±0.3(syst)%2.0±0.9(stat)±0.6(syst)%1.6±1.7(stat)±0.6(syst)%
where Abb¯C 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, ET>20GeV, and have an opening angle in the transverse plane Δϕ>2.6rad. These measurements are consistent with the predictions of the Standard Model.

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 bb¯ 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 bb¯ system. The results obtained are:
Abb¯C(40<Mbb¯<75GeV/c2)Abb¯C(75<Mbb¯<105GeV/c2)Abb¯C(Mbb¯>105GeV/c2)===0.4±0.4(stat)±0.3(syst)%2.0±0.9(stat)±0.6(syst)%1.6±1.7(stat)±0.6(syst)%
where Abb¯C 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, ET>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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:20 Feb 2015 16:23
Last Modified:08 Dec 2017 11:37
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.113.082003

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