Dijet azimuthal correlations and conditional yields in p p and p + Pb collisions at s N N = 5.02 TeV with the ATLAS detector
Dijet azimuthal correlations and conditional yields in p p and p + Pb collisions at s N N = 5.02 TeV with the ATLAS detector
复制标题
使用 ATLAS 探测器在 s N N = 5.02 TeV 处 p p 和 p Pb 碰撞中的 Dijet 方位相关性和条件产率
DOI：
10.1103/physrevc.100.034903
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发表时间：
2019
影响因子：
3.1
通讯作者：
Aaboud M
中科院分区：
文献类型：
--
作者：
Aaboud M
本文测量了质子-质子（）和质子-铅（）碰撞中前向-前向和前向-中心双喷流的方位角关联和条件产额，作为在部分子携带的每个核子的平均动量进入硬散射的分数较低的区域中探测核胶子密度的一种方法。在这些区域中，胶子饱和可以改变胶子的快速增加的部分子分布函数。该分析利用了2015年和2016年分别在大型强子对撞机的ATLAS探测器上收集的TeV数据和数据。测量是在核子-核子系统的质心坐标系中进行的，在~ 4.0的快度范围内，每次使用两个最高横向动量喷流，最高横向动量喷流限制在前向快度范围内。与碰撞相比，对于向前-向前或向前-中心双射流，没有观察到方位角相关的显著加宽。对于质子前进方向的向前向前喷流对，条件产率incollisions的那些incollisions的比率被抑制约20%，没有显着的依赖于dijet系统的横向动量。没有修改的条件产率观察到的前向中心dijet。
This paper presents a measurement of forward-forward and forward-central dijet azimuthal angular correlations and conditional yields in proton-proton () and proton-lead () collisions as a probe of the nuclear gluon density in regions where the fraction of the average momentum per nucleon carried by the parton entering the hard scattering is low. In these regions, gluon saturation can modify the rapidly increasing parton distribution function of the gluon. The analysis utilizesofdata andofdata, both atTeV, collected in 2015 and 2016, respectively, with the ATLAS detector at the Large Hadron Collider. The measurement is performed in the center-of-mass frame of the nucleon-nucleon system in the rapidity range betweenand 4.0 using the two highest transverse-momentum jets in each event, with the highest transverse-momentum jet restricted to the forward rapidity range. No significant broadening of azimuthal angular correlations is observed for forward-forward or forward-central dijets incompared tocollisions. For forward-forward jet pairs in the proton-going direction, the ratio of conditional yields incollisions to those incollisions is suppressed by approximately 20%, with no significant dependence on the transverse momentum of the dijet system. No modification of conditional yields is observed for forward-central dijets.