Measurement of the D ± production asymmetry in 7 TeV pp collisions
Measurement of the D ± production asymmetry in 7 TeV pp collisions
复制标题
7 TeV pp 碰撞中 D ± 产生不对称性的测量
DOI：
10.1016/j.physletb.2012.11.038
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发表时间：
2013
影响因子：
4.4
通讯作者：
Aaij R
中科院分区：
文献类型：
--
作者：
Aaij R
D+/-介子产生截面\sigma的不对称性A_P =（\sigma（D+）- \sigma（D-））/（\sigma（D+）+ \sigma（D-））是在LHCb探测器的接受范围内，在赝快度\eta和横动量p_T的仓中测量的。这一结果是用D+ -> K_S π +衰变的样本得到的，对应于1.0 fb^-1的积分光度，这些样本是在大型强子对撞机上收集的，质量中心能量为7 TeV。在2.0 < p_T < 18.0 GeV/c和2.20 < \eta < 4.75的运动学范围内积分，产生不对称性为A_P =（-0.96+/-0.26+/-0.18）%。引用的不确定性分别是统计的和系统的。结果假定D ~+ -> K_S π ~+衰变中的任何直接CP破坏都是可以忽略的。没有观察到对η或p_T的显著依赖性。
The asymmetry in the production cross-section \sigma of D+/- mesons, A_P = (\sigma(D+) - \sigma(D-))/(\sigma(D+) + \sigma(D-)), is measured in bins of pseudorapidity \eta and transverse momentum p_T within the acceptance of the LHCb detector. The result is obtained with a sample of D+ -> K_S pi+ decays corresponding to an integrated luminosity of 1.0 fb^-1, collected in pp collisions at a centre of mass energy of 7 TeV at the Large Hadron Collider. When integrated over the kinematic range 2.0 < p_T < 18.0 GeV/c and 2.20 < \eta < 4.75, the production asymmetry is A_P = (-0.96+/-0.26+/-0.18)%. The uncertainties quoted are statistical and systematic, respectively. The result assumes that any direct CP violation in the D+ -> K_S pi+ decay is negligible. No significant dependence on \eta or p_T is observed.