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arXiv 0907.3857hep-ex
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在CERN PS核靶上入射质子正向产生带电π介子

Forward production of charged pions with incident protons on nuclear targets at the CERN PS

The Harp Collaboration

摘要:

测量了质子与铍、碳、氮、氧、铝、铜、锡、钽和铅碰撞中动量为0.5GeV/c < p <8.0GeV/c,角度为0.025rad <θ <0.25rad范围内的双微分带电π介子产生截面。这些数据是在CERN PS的T9光束线上用大接受度HARP探测器采集的。入射粒子被一个精密的光束探测器系统识别出来。这些数据是用核相互作用长度的5%的薄靶获得的。使用HARP实验的前向系统对产生的粒子进行跟踪和识别。主要在4种入射质子束动量(3GeV/c,5GeV/c,8 GeV/c和12 GeV/c)下得到了双微分截面的结果。测量结果与GEANT 4和MARS蒙特卡罗发生器进行了比较。提供了一个全球参数化作为所有收集的数据集的近似值,可以作为快速产量估计的工具。

英文摘要:

Measurements of the double-differential charged pion production cross-section in the range of momentum 0.5 GeV/c < p < 8.0 GeV/c and angle 0.025 rad < theta <0.25 rad in collisions of protons on beryllium, carbon, nitrogen, oxygen, aluminium, copper, tin, tantalum and lead are presented. The data were taken with the large acceptance HARP detector in the T9 beam line of the CERN PS. Incident particles were identified by an elaborate system of beam detectors. The data were taken with thin targets of 5% of a nuclear interaction length. The tracking and identification of the produced particles was performed using the forward system of the HARP experiment. Results are obtained for the double-differential cross section mainly at four incident proton beam momenta (3 GeV/c, 5 GeV/c, 8 GeV/c and 12 GeV/c). Measurements are compared with the GEANT4 and MARS Monte Carlo generators. A global parametrization is provided as an approximation of all the collected datasets which can serve as a tool for quick yields estimates.

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