Yerevan Physics Institute, Yerevan, Armenia.
Phys Rev Lett. 2011 Jun 24;106(25):252001. doi: 10.1103/PhysRevLett.106.252001. Epub 2011 Jun 20.
Measurements of the differential production cross sections dσ/dpTB and dσ/dyB for B0 mesons produced in pp collisions at sqrt[s] = 7 TeV are presented. The data set used was collected by the CMS experiment at the LHC and corresponds to an integrated luminosity of 40 pb-1. The production cross section is measured from B0 meson decays reconstructed in the exclusive final state J/ψKS0, with the subsequent decays J/ψ → μ + μ - and KS0 → π+}π-. The total cross section for pTB>5 GeV and |yB|<2.2 is measured to be 33.2 ± 2.5 ± 3.5 μb, where the first uncertainty is statistical and the second is systematic.
测量了在 sqrt[s] = 7 TeV 的 pp 碰撞中产生的 B0 介子的微分产生截面 dσ/dpTB 和 dσ/dyB。使用的数据是由 CMS 实验在 LHC 上收集的，对应于 40 pb-1 的积分亮度。通过在 J/ψKS0 的独占末态中重建的 B0 介子衰变来测量产生截面，随后的衰变 J/ψ → μ + μ - 和 KS0 → π+}π-。测量到 pTB>5 GeV 和 |yB|<2.2 的总截面为 33.2 ± 2.5 ± 3.5 μb，其中第一个不确定性是统计的，第二个是系统的。
