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质子在钽靶上产生带电π介子的测量

Measurement of the production of charged pions by protons on a tantalum target

HARP Collaboration, M. G. Catanesi

备注：
49 pages, 31 figures. Version accepted for publication on Eur. Phys. J. C
发表信息：
Eur.Phys.J.C51:787-824,2007
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摘要：

本文介绍了在质子-钽碰撞中产生与入射束方向成大角度发射的带电π介子的双微分截面测量。这些数据是2002年在CERN PS的T9光束线上用HARP探测器拍摄的。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的5%的钽靶产生的。实验（$100 \MeVc \le p < 800 \MeVc$和$0.35 \rad \le θ<2.15 \rad$）所涵盖的角动量范围对于中微子工厂的设计特别重要。使用放置在螺线管磁体中的小半径圆柱形时间投影室（TPC）检测产生的颗粒。轨道识别，动量确定和粒子识别都是基于TPC的测量进行的。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。结果显示在四个入射质子束动量（3 \GeVc，5 \GeVc，8 \GeVc和12 \GeVc）的双微分截面${{\mathrm{d}^2 σ}} / {{\mathrm{d}p\mathrm{d}θ}}$。此外，在典型的中微子工厂设计的接受范围内的π介子产率被示出为束动量的函数。在一次实验中测量这些产额消除了在不同束流动量下的速率之间以及正负π介子产生之间的比较中的大多数系统误差。

英文摘要：

A measurement of the double-differential cross-section for the production of charged pions in proton--tantalum collisions emitted at large angles from the incoming beam direction is presented. The data were taken in 2002 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 tantalum target with a thickness of 5% of a nuclear interaction length. The angular and momentum range covered by the experiment ($100 \MeVc \le p < 800 \MeVc$ and $0.35 \rad \le θ<2.15 \rad$) is of particular importance for the design of a neutrino factory. The produced particles were detected using a small-radius cylindrical time projection chamber (TPC) placed in a solenoidal magnet. Track recognition, momentum determination and particle identification were all performed based on the measurements made with the TPC. 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 ${{\mathrm{d}^2 σ}} / {{\mathrm{d}p\mathrm{d}θ}}$ at four incident proton beam momenta (3 \GeVc, 5 \GeVc, 8 \GeVc and 12 \GeVc). In addition, the pion yields within the acceptance of typical neutrino factory designs are shown as a function of beam momentum. The measurement of these yields within a single experiment eliminates most systematic errors in the comparison between rates at different beam momenta and between positive and negative pion production.

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