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Title: First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production
Author: Badalov, Alexey
Calvo Gómez, Míriam
Camboni, Alessandro
Garrido Beltrán, Lluís
Gascón Fora, David
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Marin Benito, Carla
Picatoste Olloqui, Eduardo
Rives Molina, Vicente José
Ruiz, Hugo (Ruiz Pérez)
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 20-Aug-2014
Publisher: American Physical Society
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 b ¯ b pair production at a hadron collider. The data used correspond to an integrated luminosity of 1.0     fb − 1 collected at 7 TeV 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 b ¯ b system. The results obtained are A b ¯ b C ( 40 < M b ¯ b < 75     GeV / c 2 ) = 0.4 ± 0.4 ± 0.3 % , A b ¯ b C ( 75 < M b ¯ b < 105     GeV / c 2 ) = 2.0 ± 0.9 ± 0.6 % , A b ¯ b C ( M b ¯ b > 105     GeV / c 2 ) = 1.6 ± 1.7 ± 0.6 % , where A b ¯ b C is defined as the asymmetry in the difference in rapidity between jets formed from the beauty quark and antiquark, where in each case the first uncertainty is statistical and the second systematic. The beauty jets are required to satisfy 2 < η < 4 , E T > 20     GeV , and have an opening angle in the transverse plane Δ ϕ > 2.6     rad . These measurements are consistent with the predictions of the standard model.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2014, vol. 113, num. 8, p. 082003
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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