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首页> 外文期刊>Physics letters >Measurement of the B ˉ 0 B 0 and B ˉ s 0 B s 0 production asymmetries in pp collisions at s = 7 ? TeV
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Measurement of the B ˉ 0 B 0 and B ˉ s 0 B s 0 production asymmetries in pp collisions at s = 7 ? TeV

机译: B ˉ 0 B 0 B ˉ s 0 B s 0 pp s = 7 TeV

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The B ˉ 0 – B 0 and B ˉ s 0 – B s 0 production asymmetries, A P ( B 0 ) and A P ( B s 0 ) , are measured by means of a time-dependent analysis of B 0 → J / ψ K ? 0 , B 0 → D ? π + and B s 0 → D s ? π + decays, using a data sample corresponding to an integrated luminosity of 1.0 ? fb ? 1 , collected by LHCb in pp collisions at a centre-of-mass energy of 7 ? TeV . The measurements are performed as a function of transverse momentum and pseudorapidity of the B 0 and B s 0 mesons within the LHCb acceptance. The production asymmetries, integrated over p T and η in the range 4 p T 30 ? GeV / c and 2.5 η 4.5 , are determined to be A P ( B 0 ) = ( ? 0.35 ± 0.76 ± 0.28 ) % and A P ( B s 0 ) = ( 1.09 ± 2.61 ± 0.66 ) % , where the first uncertainties are statistical and the second systematic.
机译:Bˉ0 – B 0和B s 0 – B s 0生产不对称性AP(B 0)和AP(B s 0)是通过对B 0→J /ψK进行时变分析来测量的? 0,B 0→D? π+和B s 0→D s? π+衰变,使用的数据样本对应的积分亮度为1.0? fb? 1,由LHCb在pp碰撞中以7?的质心能量收集。 TeV。根据LHCb接受范围内B 0和B s 0介子的横向动量和假快速性进行测量。在p T和η上积分的生产不对称度在4 T <30? GeV / c和2.5 <η<4.5被确定为AP(B 0)=(0.35±0.76±0.28)%和AP(B s 0)=(1.09±2.61±0.66)%,其中第一个不确定性。是统计的,第二个是系统的。

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