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Study of W boson production in association with beauty and charm

Abstract : The associated production of a W boson with a jet originating from either a light parton or heavy-flavor quark is studied in the forward region using proton-proton collisions. The analysis uses data corresponding to integrated luminosities of 1.0 and 2.0fb−1 collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, respectively. The W bosons are reconstructed using the W→μν decay and muons with a transverse momentum, pT, larger than 20 GeV in the pseudorapidity range 2.0<η<4.5. The partons are reconstructed as jets with pT>20 GeV and 2.2<η<4.2. The sum of the muon and jet momenta must satisfy pT>20 GeV. The fraction of W+jet events that originate from beauty and charm quarks is measured, along with the charge asymmetries of the W+b and W+c production cross-sections. The ratio of the W+jet to Z+jet production cross-sections is also measured using the Z→μμ decay. All results are in agreement with Standard Model predictions.
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http://hal.in2p3.fr/in2p3-01152569
Contributor : Sabine Starita <>
Submitted on : Monday, May 18, 2015 - 11:17:47 AM
Last modification on : Friday, November 6, 2020 - 11:44:14 AM

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Study of W boson production in association with beauty and charm. Physical Review D, American Physical Society, 2015, 92, pp.052001. ⟨10.1103/PhysRevD.92.052001⟩. ⟨in2p3-01152569⟩

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