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arXiv 1005.3299hep-ex
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在sqrt(s)= 7 TeV的pp碰撞中带电强子的横动量和赝快度分布

Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at sqrt(s) = 7 TeV

The CMS Collaboration

摘要:

用LHC CMS探测器的内跟踪系统测量了sqrt(s)= 7 TeV质子-质子碰撞中的带电强子横动量和赝快度分布。带电强子产额是通过计算重建的命中数、命中对数和完全重建的带电粒子径迹数得到的。这三种方法的组合给出了每单位赝快度的带电粒子多重数dN(带电)/d(η),对于|eta| < 0.5,对于非单衍射事件为5.78 +/- 0.01(stat)+/- 0.23(syst),高于常用模型的预测。从sqrt(s)= 0.9到7 TeV,带电粒子多重性的相对增加是66.1% +/- 1.0%(stat)+/- 4.2%(syst)。平均横向动量测量为0.545 +/- 0.005(stat)+/- 0.015(syst)GeV/c。在较低的能量与类似的测量结果进行了比较。

英文摘要:

Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at sqrt(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(charged)/d(eta), for |eta| < 0.5, of 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 sqrt(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.

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