核子-核子质心能量为5.02 TeV的pPb碰撞中带电粒子横动量谱的核效应
Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV
摘要：
在质子-核子质心坐标系下，利用CMS实验测量了sqrt（s[NN]）= 5.02 TeV，0.4 < pt < 120 GeV，赝快度abs（eta[CM]）< 1.8的pPb碰撞中带电粒子的横动量谱.对于pt < 10 GeV，带电粒子的产生在eta[CM] = 0附近是不对称的，在质子束的方向上观察到较小的产额，这与核部分子分布函数（nPDF）中阴影的预期定性一致。在sqrt（s）= 5.02 TeV的pp参考谱是由以前的测量在较高和较低的质心能量的插值。在pPb碰撞中测得的pt分布表明，与pp参考的预期相比，pt > 20 GeV的带电粒子增强。的增强是大于预测的微扰量子色动力学计算，包括反阴影修改的nPDF。
英文摘要：
Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at sqrt(s[NN]) = 5.02 TeV, in the range 0.4 < pt < 120 GeV and pseudorapidity abs(eta[CM]) < 1.8 in the proton-nucleon center-of-mass frame. For pt < 10 GeV, the charged-particle production is asymmetric about eta[CM] = 0, with smaller yield observed in the direction of the proton beam, qualitatively consistent with expectations from shadowing in nuclear parton distribution functions (nPDF). A pp reference spectrum at sqrt(s) = 5.02 TeV is obtained by interpolation from previous measurements at higher and lower center-of-mass energies. The pt distribution measured in pPb collisions shows an enhancement of charged particles with pt > 20 GeV compared to expectations from the pp reference. The enhancement is larger than predicted by perturbative quantum chromodynamics calculations that include antishadowing modifications of nPDFs.
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