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$\sqrt{s} =$ ~（13）TeV质子-质子碰撞中双喷射事件的硬色-单重态交换

Hard color-singlet exchange in dijet events in proton-proton collisions at $\sqrt{s} =$ 13 TeV

CMS, TOTEM Collaborations

备注：
Corrected the URL for the public results site. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-19-006 (CMS Public Pages)
发表信息：
Phys. Rev. D 104, 032009 (2021)
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摘要：

事件中的两个领先的射流分开的伪快度间隔没有粒子活动，被称为喷射间隙喷射事件，在质子-质子碰撞在$\sqrt{s} =$ 13 TeV的研究。该特征预计来自硬色单重态交换。每一个最高横向动量（$p_\mathrm{T}$）喷流必须具有$p_\mathrm{T}^\text{jet}$ $\gt$ 40 GeV和赝快度1.4 $\lt$ $|η^\text{jet}|$ $\lt$ 4.7，$η^\text{jet1} η^\text{jet2}$ $\lt$ 0，其中$\text{jet1}$和$\text{jet2}$分别是$p_\mathrm{T}$中的领先喷流和次领先喷流。该分析基于CMS和TOTEM实验在2015年CERN LHC运行的低光度，高$β^*$期间收集的数据，其综合光度为0.66 pb $^{-1}$。事件与低数量的带电粒子与$p_\mathrm{T}$ $\gt$ 0.2 GeV的间隔$|η|$ $\lt$ 1之间的喷流观察超过的计算，假设只有颜色交换。通过颜色单态交换产生的事件的分数，$f_\text{CSE}$，测量作为$p_\mathrm{T}^\text{jet2}$，两个领先的喷气机之间的赝快度差，和两个领先的喷气机之间的方位角间距的函数。分数$f_\text{CSE}$具有0.4- 1.0%的值。结果与以前的测量和预测微扰量子色动力学。此外，第一次研究喷气间隙喷气事件检测与一个完整的质子使用子样本的事件与0.40 PB $^{-1}$的综合光度。完整的质子被探测到的罗马壶探测器的TOTEM实验。该样品中的$f_\text{CSE}$为2.91 $\pm$ 0.70（stat）$^{+1.08}_{-1.01}$（syst）倍，大于具有相似运动学的双射流中包含性双射流产生的$f_\text{CSE}$。

英文摘要：

Events where the two leading jets are separated by a pseudorapidity interval devoid of particle activity, known as jet-gap-jet events, are studied in proton-proton collisions at $\sqrt{s} =$ 13 TeV. The signature is expected from hard color-singlet exchange. Each of the highest transverse momentum ($p_\mathrm{T}$) jets must have $p_\mathrm{T}^\text{jet}$ $\gt$ 40 GeV and pseudorapidity 1.4 $\lt$ $|η^\text{jet}|$ $\lt$ 4.7, with $η^\text{jet1} η^\text{jet2}$ $\lt$ 0, where $\text{jet1}$ and $\text{jet2}$ are the leading and subleading jets in $p_\mathrm{T}$, respectively. The analysis is based on data collected by the CMS and TOTEM experiments during a low luminosity, high-$β^*$ run at the CERN LHC in 2015, with an integrated luminosity of 0.66 pb$^{-1}$. Events with a low number of charged particles with $p_\mathrm{T}$ $\gt$ 0.2 GeV in the interval $|η|$ $\lt$ 1 between the jets are observed in excess of calculations that assume only color-exchange. The fraction of events produced via color-singlet exchange, $f_\text{CSE}$, is measured as a function of $p_\mathrm{T}^\text{jet2}$, the pseudorapidity difference between the two leading jets, and the azimuthal angular separation between the two leading jets. The fraction $f_\text{CSE}$ has values of 0.4-1.0%. The results are compared with previous measurements and with predictions from perturbative quantum chromodynamics. In addition, the first study of jet-gap-jet events detected in association with an intact proton using a subsample of events with an integrated luminosity of 0.40 pb$^{-1}$ is presented. The intact protons are detected with the Roman pot detectors of the TOTEM experiment. The $f_\text{CSE}$ in this sample is 2.91 $\pm$ 0.70 (stat) $^{+1.08}_{-1.01}$ (syst) times larger than that for inclusive dijet production in dijets with similar kinematics.

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