Edinburgh Research Explorer Measurement of the D+/- production asymmetry in 7 TeV pp collisions
Edinburgh Research Explorer Measurement of the D+/- production asymmetry in 7 TeV pp collisions
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爱丁堡研究探索者测量 7 TeV pp 碰撞中 D /- 产生不对称性
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通讯作者：
C. Worthman
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作者：
D. Hruschka;B. Kohrt;C. Worthman
D ±介子的产生截面σ的不对称性σ D −是在LHCb探测器的接受范围内，在赝快度η和横向动量p T的仓中测量的。这个结果是用D + → K 0S π +衰变的样本得到的，对应于1.0 fb − 1的积分光度，收集于大型强子对撞机上质量中心能量为7 TeV的pp碰撞。当在运动学范围2上积分时。0 <p T <18。0 GeV/c和2. 20 <η <4。75，则生产不对称性为A P =（− 0. 96 ± 0。26 ± 0。百分之十八。引用的不确定性分别是统计的和系统的。结果假定D + → K0S 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。© 2012 CERN。Elsevier B.V.出版，保留所有权利。
The asymmetry in the production cross-section σ of D ± mesons, σ D − , is measured in bins of pseudorapidity η and transverse momentum p T within the acceptance of the LHCb detector. The result is obtained with a sample of D + → K 0S π + 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 < η < 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 0S π + decay is negligible. No significant dependence on η or p T is observed. © 2012 CERN. Published by Elsevier B.V. All rights reserved.