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首页> 外文期刊>Physical review, C >Production of charged pions, kaons, and (anti-)protons in Pb-Pb and inelastic pp collisions at root s(NN)=5.02 TeV
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Production of charged pions, kaons, and (anti-)protons in Pb-Pb and inelastic pp collisions at root s(NN)=5.02 TeV

机译：在PB-PB中产生带电的关节，卡延和（抗抗抗体质子，并在Root S（NN）= 5.02 Tev中的无弹性PP碰撞

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摘要

Midrapidity production of pi(+/-), K-+/-, and (<(p))over bar>p measured by the ALICE experiment at the CERN Large Hadron Collider, in Pb-Pb and inelastic pp collisions at root s(NN) = 5.02 TeV, is presented. The invariant yields are measured over a wide transverse momentum (p(T)) range from hundreds of MeV/c up to 20 GeV/c. The results in Pb-Pb collisions are presented as a function of the collision centrality, in the range 0-90%. The comparison of the P-T -integrated particle ratios, i.e., proton-to-pion (p/pi) and kaon-to-pion (K/pi) ratios, with similar measurements in Pb-Pb collisions at root s(NN) = 2.76 TeV show no significant energy dependence. Blast-wave fits of the p(T) spectra indicate that in the most central collisions radial flow is slightly larger at 5.02 TeV with respect to 2.76 TeV. Particle ratios (p/pi, K/pi) as a function of p(T) show pronounced maxima at p(T) approximate to 3 GeV/c in central Pb-Pb collisions. At high p(T) , particle ratios at 5.02 TeV are similar to those measured in pp collisions at the same energy and in Pb-Pb collisions at root sNN = 2.76 TeV. Using the pp reference spectra measured at the same collision energy of 5.02 TeV, the nuclear modification factors for the different particle species are derived. Within uncertainties, the nuclear modification factor is particle species independent for high p(T) and compatible with measurements at root sNN = 2.76 TeV. The results are compared to state-of-the-art model calculations, which are found to describe the observed trends satisfactorily.
机译：通过CERN大型强子撞机的Alice实验，在CERN大型强子撞机中的PB-PB和根部的非弹性PP碰撞中通过BAR> P，MIDARAPIDITY生产PI（+/-），K - + / - 和（<（p））上的（<（p））测量（NN）= 5.02 TEV，如图所示。不变产量在宽横向动量（P（t））范围内测量，从数百MEV / c高达20 gev / c。 PB-PB碰撞中的结果作为碰撞中心的函数呈现，其范围为0-90％。 pt-聚集颗粒比的比较，即质子对π（p / pi）和kaOn对π（k / pi）比，在根s（nn）=的pb-pb碰撞中具有相似的测量。 2.76 TEV显示没有显着的能量依赖。 P（t）光谱的喷波配合表明，在最多的中央碰撞中，径向流动在5.02 tev时略大于2.76 tev。粒子比（P / PI，K / PI）作为P（t）的函数，在中央PB-PB冲突中显示P（T）的P（t）的发音最大值。在高p（t）的情况下，5.02 tev的粒子比类似于在同一能量的PP碰撞中测量的粒子比，并在根SNN = 2.76 Tev中的PB-PB碰撞中测量。使用在5.02 Tev的相同碰撞能中测量的PP参考光谱，推导出不同颗粒物种的核改性因子。在不确定因素中，核改性因子是颗粒物种，独立于高p（t），并与根SNN = 2.76 Tev的测量相容。结果与最先进的模型计算进行了比较，这些计算结果被发现令人满意地描述所观察到的趋势。

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