3 GeV/c - 12 GeV/c质子在碳、铜和锡靶上大角度产生带电π介子
Large-angle production of charged pions by 3 GeV/c - 12 GeV/c protons on carbon, copper and tin targets
摘要：
在π动量$100 \MeVc \leq p < 800 \MeVc$和角$0.35 \rad \le θ<2.15 \rad$范围内，测量了质子-碳、质子-铜和质子-锡碰撞的双微分$π^{\pm}$产生截面.这些数据是用CERN PS的T9束线中的HARP探测器采集的。π介子是由动量范围为3 \GeVc到12 \GeVc的质子束撞击厚度为核相互作用长度5%的靶而产生的。使用放置在螺线管磁体中的小半径圆柱形时间投影室（TPC）来完成对所产生的颗粒的跟踪和识别。光束线上的一个精密的探测器系统确保了对入射粒子的识别。给出了四个入射质子束动量（3 \GeVc、5 \GeVc、8 \GeVc和12 \GeVc）下的双微分截面的结果。
英文摘要：
A measurement of the double-differential $π^{\pm}$ production cross-section in proton--carbon, proton--copper and proton--tin collisions in the range of pion momentum $100 \MeVc \leq p < 800 \MeVc$ and angle $0.35 \rad \le θ<2.15 \rad$ is presented. The data were taken with the HARP detector in the T9 beam line of the CERN PS. The pions were produced by proton beams in a momentum range from 3 \GeVc to 12 \GeVc hitting a target with a thickness of 5% of a nuclear interaction length. The tracking and identification of the produced particles was done using a small-radius cylindrical time projection chamber (TPC) placed in a solenoidal magnet. An elaborate system of detectors in the beam line ensured the identification of the incident particles. Results are shown for the double-differential cross-sections at four incident proton beam momenta (3 \GeVc, 5 \GeVc, 8 \GeVc and 12 \GeVc).
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