论文标题
LHCB的中央独家生产
Central exclusive production at LHCb
论文作者
论文摘要
The LHCb collaboration has measured central exclusive production of $J/ψ$, $ψ(2S)$, and $Υ$ mesons as well as $J/ψJ/ψ$, $J/ψψ(2S)$, $ψ(2S)ψ(2S)$, and $χ_cχ_c$ meson pairs in proton-proton collisions. $υ$和charmonium对的分析在7 TEV和8 TEV的质量中心进行，$ J/ψ$和$ψ（2s）$的分析在7 TEV和13 TEV进行。 13 TEV的分析涉及使用新淋浴计数器。这些可以通过在迅速扩展区域的活动中否决活动来减少背景。 LHCB中央独家生产的测量对Bjorken- $ x $值的Gluon分布敏感至$ 2 \ times10^{ - 6} $（在13 TEV）。提出了LHCB结果的概述，并将其与其他实验和理论计算的现有测量结果进行了比较。
The LHCb collaboration has measured central exclusive production of $J/ψ$, $ψ(2S)$, and $Υ$ mesons as well as $J/ψJ/ψ$, $J/ψψ(2S)$, $ψ(2S)ψ(2S)$, and $χ_cχ_c$ meson pairs in proton-proton collisions. The analyses of $Υ$ and charmonium pairs are performed at the centre-of-mass energies of 7 TeV and 8 TeV, and those of $J/ψ$ and $ψ(2S)$ are done at 7 TeV and 13 TeV. The analysis at 13 TeV involves the use of new shower counters. These allow a reduction in the background by vetoing events with activity in an extended region in rapidity. The measurements of central exclusive production at LHCb are sensitive to gluon distributions for Bjorken-$x$ values down to $2\times10^{-6}$ (at 13 TeV). An overview of the LHCb results is presented and compared to existing measurements of other experiments and theoretical calculations.
