Measurements of longitudinal and transverse momentum distributions for neutral pions in the forward-rapidity region with the LHCf detector
Measurements of longitudinal and transverse momentum distributions for neutral pions in the forward-rapidity region with the LHCf detector
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DOI：
10.1103/physrevd.94.032007
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发表时间：
2016-08-22
影响因子：
5
通讯作者：
Zhou, Q. D.
中科院分区：
文献类型：
--
作者：
Adriani, O.;Berti, E.;Zhou, Q. D.
在LHC上，用LHC正向探测器测量了质子-质子碰撞在根s = 2.76和7 TeV和质子-铅碰撞在根sNN = 5.02 TeV时，包含中性介子的横截面随横向动量和纵向动量的函数。这种质子-质子碰撞的微分截面符合极限破碎和费曼标度的假设。比较质子-质子和质子-铅碰撞，我们发现在减去超外围质子-铅碰撞后，在微分截面上中性介子的产生有相当大的抑制。这种抑制作用对应于核修饰因子约为0.1 ~ 0.3。本文的实验测量结果为强子相互作用蒙特卡罗模拟代码用于模拟宇宙射线空气阵雨提供了一个基准。
The differential cross sections for inclusive neutral pions as a function of transverse and longitudinal momentum in the very forward-rapidity region have been measured at the LHC with the LHC forward detector in proton-proton collisions at root s = 2.76 and 7 TeV and in proton-lead collisions at nucleon nucleon center-of-mass energies of root sNN = 5.02 TeV. Such differential cross sections in proton-proton collisions are compatible with the hypotheses of limiting fragmentation and Feynman scaling. Comparing proton-proton with proton-lead collisions, we find a sizable suppression of the production of neutral pions in the differential cross sections after subtraction of ultraperipheral proton-lead collisions. This suppression corresponds to the nuclear modification factor value of about 0.1-0.3. The experimental measurements presented in this paper provide a benchmark for the hadronic interaction Monte Carlo simulation codes that are used for the simulation of cosmic ray air showers.