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First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production

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First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production

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dc.contributor.author	LHCb Collaboration
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Oyanguren Campos, Arantza
dc.contributor.author	Ruiz Valls, Pablo
dc.contributor.author	Sánchez Mayordomo, Carlos
dc.date.accessioned	2016-04-19T12:24:05Z
dc.date.available	2016-04-19T12:24:05Z
dc.date.issued	2014
dc.identifier.citation	LHCb Collaboration Martínez Vidal, Fernando Oyanguren Campos, Arantza Ruiz Valls, Pablo Sánchez Mayordomo, Carlos 2014 First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production Physical Review Letters 113 8 082003-1 082003-9
dc.identifier.uri	http://hdl.handle.net/10550/52832
dc.description.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) over bar 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) over bar system. The results obtained are A(C)(b (b) over bar) (40 < M-b<(b)over bar> < 75 GeV/c(2)) = 0.4 +/- 0.4 +/- 0.3%, A(C)(b (b) over bar) (75 < M-b<(b)over bar> < 105 GeV/c(2)) = 2.0 +/- 0.9 +/- 0.6%, A(C)(b (b) over bar) (M-b (b) over bar > 10(5) GeV/c(2)) = 1.6 +/- 1.7 +/- 0.6%,where A(C)(b (b) over bar) 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 < eta < 4, E-T > 20 GeV, and have an opening angle in the transverse plane Delta phi > 2.6 rad. These measurements are consistent with the predictions of the standard model.
dc.language.iso	eng
dc.relation.ispartof	Physical Review Letters, 2014, vol. 113, num. 8, p. 082003-1-082003-9
dc.subject	Física nuclear
dc.title	First Measurement of the Charge Asymmetry in Beauty-Quark Pair Production
dc.type	journal article	es_ES
dc.date.updated	2016-04-19T12:24:06Z
dc.identifier.doi	10.1103/PhysRevLett.113.082003
dc.identifier.idgrec	101840
dc.rights.accessRights	open access	es_ES