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首页> 外文期刊>Physical review letters >Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at ~(1/2)SNN = 5.02 TeV
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Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at ~(1/2)SNN = 5.02 TeV

机译:在〜(1/2)SNN = 5.02 Tev中使用质子 - 质子和质子铅碰撞中的Dijets在核中使用Dijets在核中的约束胶原分布

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摘要

The pseudorapidity distributions of dijets as functions of their average transverse momentum (p(T)(ave)) are measured in proton-lead (pPb) and proton-proton (pp) collisions. The data samples were collected by the CMS experiment at the CERN LHC, at a nucleon-nucleon center-of-mass energy of 5.02 TeV. A significant modification of the pPb spectra with respect to the pp spectra is observed in all p(T)(ave) intervals investigated. The ratios of the pPb and pp distributions are compared to next-to-leading order perturbative quantum chromodynamics calculations with unbound nucleon and nuclear parton distribution functions (PDFs). These results give the first evidence that the gluon PDF at large Bjorken x in lead ions is strongly suppressed with respect to the PDF in unbound nucleons.
机译:Dijets作为其平均横向动量的函数的伪发布分布(P(t)(ave))在质子引线(PPB)和质子 - 质子(PP)碰撞中测量。 通过CERN LHC的CMS实验收集数据样品,在5.02 Tev的核仁核心核心能量下。 在研究的所有P(t)(AVE)间隔中观察到相对于PP光谱的PPB光谱的显着修改。 将PPB和PP分布的比率与未结合核聚核聚和核分布分布函数(PDF)进行比较的术语扰动量子色动力学计算。 这些结果提供了第一种证据,即在未结合的核中的PDF中强制抑制了大Bjorken X中的胶原PDF。

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