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arXiv 1301.6539hep-ph
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LHC处重子横动量分布和宇宙质子谱中的“膝”

Baryon Transverse Momentum Distributions at LHC and the "Knee" in Cosmic Proton Spectrum

O. Piskounova

摘要:

本文从夸克-胶子弦模型(QGSM)的观点出发,以大型强子对撞机(LHC)实验(ALICE,ATLAS,CMS)中超子的横动量谱为例,讨论了超子在极高能下的典型重子谱。用以能量相关斜率为主要参数的普适QGSM公式拟合了LHC在\sqrt{s} = 0.9和7 TeV的数据和STAR在\sqrt{s} = 200 GeV的数据。利用<Pt>这个公式,得到了α对碰撞能的依赖关系.平均横动量的能量依赖性的渐近性显示了预期的波密子行为~ s ^[0,12]。这个结论对宇宙线物理学非常重要。这意味着,在实验室系统中,在E_p= 4 × 10^15 eV处宇宙质子谱中长期争论的“膝盖”不再被认为是重子强子产生动力学剧烈变化的结果。与此同时,它可能表明我们银河系中产生的质子的最大能量。最后一个结论依赖于强子产生模型。

英文摘要:

The transverse momentum spectra of hyperons from LHC experiments (ALICE, ATLAS, CMS) are considered from the point of view of Quark-Gluon String Model (QGSM) as examples of typical baryon spectra at very high energies. The LHC data at \sqrt{s} = 0.9 and 7 TeV and STAR data at \sqrt{s} = 200 GeV are fitted with the universal QGSM formula that includes the energy dependent slope as the main parameter. The dependence of <Pt> on the collision energy has been obtained with the help of this formula. The asymptotics of the energy dependence of average transverse momenta shows the expected pomeronic behavior ~ s^0,12. This conclusion is very important for cosmic ray physics. It means that the long debated "knee" in the cosmic proton spectra at E_p= 4 10^15 eV in laboratory system can not be considered any more as the result of dramatic changes in the dynamics of baryon hadroproduction. In the same time it may indicate the maximal energy of protons that are being produced in our Galaxy. This last conclusion depends on the hadroproduction model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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