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W C, Zhang Y, Zhelezov A, Zhong L, Zvyagin A
Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
Universitat de Barcelona, Barcelona, Spain.
Eur Phys J C Part Fields. 2012;72(8):2100. doi: 10.1140/epjc/s10052-012-2100-4. Epub 2012 Aug 10.
The differential cross-section for the inclusive production of (2) mesons in collisions at [Formula: see text] has been measured with the LHCb detector. The data sample corresponds to an integrated luminosity of 36 pb. The (2) mesons are reconstructed in the decay channels (2)→ and (2)→/, with the / meson decaying into two muons. Results are presented both for promptly produced (2) mesons and for those originating from -hadron decays. In the kinematic range ((2))≤16 GeV/ and 2<((2))≤4.5 we measure [Formula: see text] where the last uncertainty on the prompt cross-section is due to the unknown (2) polarization. Recent QCD calculations are found to be in good agreement with our measurements. Combining the present result with the LHCb / measurements we determine the inclusive branching fraction [Formula: see text] where the last uncertainty is due to the [Formula: see text], [Formula: see text] and [Formula: see text] branching fraction uncertainties.
利用大型强子对撞机底夸克（LHCb）探测器测量了在[公式：见原文]碰撞中包含（2）介子的微分截面。数据样本对应的积分亮度为36皮靶。（2）介子在衰变通道（2）→和（2）→/中重建，其中/介子衰变成两个μ子。给出了即时产生的（2）介子以及源自重子衰变的（2）介子的结果。在运动学范围（（2））≤16 GeV/且2<（（2））≤4.5内，我们测量了[公式：见原文]，其中即时截面的最后一个不确定度是由于未知的（2）极化。发现最近的量子色动力学（QCD）计算与我们的测量结果吻合良好。将当前结果与LHCb /测量结果相结合，我们确定了包含分支比[公式：见原文]，其中最后一个不确定度是由于[公式：见原文]、[公式：见原文]和[公式：见原文]分支比的不确定度。
