Yerevan Physics Institute, Yerevan, Armenia.
Phys Rev Lett. 2010 Jul 9;105(2):022002. doi: 10.1103/PhysRevLett.105.022002. Epub 2010 Jul 6.
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at square root of s = 7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dN(ch)/dη|(|η|<0.5) = 5.78 ± 0.01(stat) ± 0.23(syst) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from square root of s = 0.9 to 7 TeV is [66.1 ± 1.0(stat) ± 4.2(syst)]%. The mean transverse momentum is measured to be 0.545 ± 0.005(stat) ± 0.015(syst) GeV/c. The results are compared with similar measurements at lower energies.
在 LHC 的 CMS 探测器的内部分层系统的帮助下，对质心能量为 sqrt(s)=7 TeV 的质子-质子碰撞中的带电粒子横动量和赝快度分布进行了测量。通过对重建的 hit、hit pair 和完全重建的带电粒子轨迹进行计数，得到了带电粒子的产额。这三种方法的组合给出了非单散射事件的单位赝快度 dN(ch)/dη|(|η|<0.5)=5.78±0.01(stat)±0.23(syst)的带电粒子多重数，高于常用模型的预测。带电粒子多重数从 sqrt(s)=0.9 到 7 TeV 的相对增加量为 [66.1±1.0(stat)±4.2(syst)]%。测量得到的平均横向动量为 0.545±0.005(stat)±0.015(syst)GeV/c。结果与较低能量下的类似测量进行了比较。
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