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arXiv 1003.2963hep-phhep-exnucl-ex
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TeV能强子碰撞中large-pT带电粒子的单包含产生和微扰QCD预言

Single-inclusive production of large-pT charged particles in hadronic collisions at TeV energies and perturbative QCD predictions

Francois Arleo, David d'Enterria, Andre S. Yoon

摘要:

利用CDF实验在sqrt(s)=1.96 TeV的质子-反质子(p-pbar)碰撞中测量了横动量pT=3-150 GeV/c的带电粒子在中快度下的单包谱,并与使用最新参数化的部分子分布和部分子-强子碎裂函数的次领先阶(NLO)微扰QCD计算结果进行了比较.在pT~20 GeV/c以上,Tevatron数据与NLO预测和xT标度预期相比存在相当大的分歧,表明实验数据存在问题。我们还提出了在LHC能量(sqrt(s)=0.9-14 TeV)下质子-质子(p-p)碰撞的pT微分带电强子谱的预测和相关的理论不确定性。本文提出了两种由p-p测量估算LHC重离子碰撞能(sqrt(s)= 2.76,5.5TeV)带电强子谱的方法。

英文摘要:

The single inclusive spectrum of charged particles with transverse momenta pT=3-150 GeV/c measured at midrapidity by the CDF experiment in proton-antiproton (p-pbar) collisions at sqrt(s)=1.96 TeV is compared to next-to-leading order (NLO) perturbative QCD calculations using the most recent parametrizations of the parton distributions and parton-to-hadron fragmentation functions. Above pT~20 GeV/c, there is a very sizeable disagreement of the Tevatron data compared to the NLO predictions and to xT-scaling expectations, suggesting a problem in the experimental data. We also present the predictions for the pT-differential charged hadron spectra and the associated theoretical uncertainties for proton-proton (p-p) collisions at LHC energies (sqrt(s)=0.9-14 TeV). Two procedures to estimate the charged hadron spectra at LHC heavy-ion collision energies (sqrt(s)=2.76,5.5 TeV) from p-p measurements are suggested.

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