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Wislicki W, Witek M, Wormser G, Wotton S A, Wright S, Wu S, Wyllie K, Xie Y, Xing Z, Xu Z, Yang Z, Yuan X, Yushchenko O, Zangoli M, Zavertyaev M, Zhang L, Zhang W C, Zhang Y, Zhelezov A, Zhokhov A, Zhong L, Zvyagin A
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
Phys Rev Lett. 2014 Aug 22;113(8):082003. doi: 10.1103/PhysRevLett.113.082003. Epub 2014 Aug 20.
The difference in the angular distributions between beauty quarks and antiquarks, referred to as the charge asymmetry, is measured for the first time in bb 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 bb system. The results obtained are A(C)(bb))(40<M(bb))<75 GeV/c(2)) = 0.4 ± 0.4 ± 0.3%, A(C)(bb))(75<M(bb)) < 105 GeV/c(2)) = 2.0 ± 0.9 ± 0.6%, A(C)(bb)(M(bb)) > 105 GeV/c(2)) = 1.6 ± 1.7 ± 0.6%, where A(C)(bb)) 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.
在强子对撞机的(b\overline{b})对产生过程中，首次测量了美夸克与反美夸克之间角分布的差异，即电荷不对称性。所使用的数据对应于用大型强子对撞机底夸克探测器（LHCb）在质子 - 质子碰撞中，质心能量为(7) TeV时收集的(1.0) fb(^{-1})的积分亮度。测量在(b\overline{b})系统的不变质量的三个区域进行。得到的结果是(A_{C}(b\overline{b})(40\lt M(b\overline{b})\lt75\ \text{GeV}/c^{2}) = 0.4\pm0.4\pm0.3%)，(A_{C}(b\overline{b})(75\lt M(b\overline{b})\lt105\ \text{GeV}/c^{2}) = 2.0\pm0.9\pm0.6%)，(A_{C}(b\overline{b})(M(b\overline{b})\gt105\ \text{GeV}/c^{2}) = 1.6\pm1.7\pm0.6%)，其中(A_{C}(b\overline{b}))定义为从美夸克和反美夸克形成的喷注之间快度差的不对称性，在每种情况下，第一个不确定度是统计性的，第二个是系统性的。要求美喷注满足(2\lt\eta\lt4)，(E_{T}\gt20\ \text{GeV})，并且在横向平面中的张角(\Delta\phi\gt2.6\ \text{rad})。这些测量结果与标准模型的预测一致。
