论文标题
$ \ sqrt {s_ \ mathrm {nn}} $ = 8.16 TEV，使用$γ$ P交互中的两粒子方位角相关性
Two-particle azimuthal correlations in $γ$p interactions using pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV
论文作者
论文摘要
介绍了从LHC发出的充电Hadron（$ v_ {nδ} $）的傅里叶系数（$ v_ {nδ} $）的第一个测量值。数据是从$ \ sqrt {s_ \ mathrm {nn}} $ = 8.16 $ = 8.16 tev的68.8 nb $^{ - 1} $中的68.8 nb $^{ - 1} $中提取的数据。高能铅离子产生的光子通量可以与迎面而来的质子相互作用。该$γ$ P系统提供了一组独特的初始条件，其多重性低于光子铅碰撞，但与最近的电子峰值和电子 - 普罗顿数据相当。 $ v_ {nδ} $系数以事件多重性和横向动量的范围（$ p_ \ mathrm {t} $）呈现，并与相应的HADRONIC最小偏置PPB结果进行了比较。对于给定的多重性范围，带电粒子的平均$ P_ \ MATHRM {T} $在$γ$ P中比PPB碰撞较小。对于$γ$ p和ppb样品，$ v_ {1Δ} $为负，$ v_ {2Δ} $是正的，并且$ v_ {3Δ} $与0一致。对于每个多重性，对于$ p_ \ p_ \ mathrm {t} $ range，$ v_ {2Δ} $ for $γ$ p Events for $γ$ p evest。 $γ$ P数据与没有集体效应的模型预测一致。
The first measurements of the Fourier coefficients ($V_{nΔ}$) of the azimuthal distributions of charged hadrons emitted from photon-proton ($γ$p) interactions at the LHC are presented. The data are extracted from 68.8 nb$^{-1}$ of ultra-peripheral proton-lead (pPb) collisions at $\sqrt{s_\mathrm{NN}}$ = 8.16 TeV using the CMS detector. The high energy lead ions produce a flux of photons that can interact with the oncoming proton. This $γ$p system provides a set of unique initial conditions with multiplicity lower than in photon-lead collisions but comparable to recent electron-positron and electron-proton data. The $V_{nΔ}$ coefficients are presented in ranges of event multiplicity and transverse momentum ($p_\mathrm{T}$) and are compared to corresponding hadronic minimum bias pPb results. For a given multiplicity range, the mean $p_\mathrm{T}$ of charged particles is smaller in $γ$p than in pPb collisions. For both the $γ$p and pPb samples, $V_{1Δ}$ is negative, $V_{2Δ}$ is positive, and $V_{3Δ}$ consistent with 0. For each multiplicity and $p_\mathrm{T}$ range, $V_{2Δ}$ is larger for $γ$p events. The $γ$p data are consistent with model predictions that have no collective effects.
