Harp Collaboration

Harp Collaboration
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竖琴合作

DOI：
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发表时间：
2007
期刊：
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通讯作者：
Spain
Spain
中科院分区：
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文献类型：
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作者：
M. Catanesi;M. Muciaccia;E. Radicioni;S. Simone;R. Edgecock;M. Ellis;S. Robbins;F. Soler;C. Gössling;M. Maß;S. Bunyatov;A. Chukanov;D. Dedovitch;A. Elagin;M. Gostkin;A. Guskov;D. Khartchenko;O. Klimov;A. Krasnoperov;D. Kustov;K. Nikolaev;B. Popov;V. Serdiouk;V. Tereshchenko;A. Zhemchugov;E. Capua;G. Vidal;Sitjes;Cern;Switzerland A Geneva;S. Blondel;M. Borghi;A. Campanelli;Cervera;M. C. Villanueva;G. Morone;Prior;R. Schroeter;V. Ableev;U. Gastaldi;G. Mills;J. Graulich;G. Grégoire;M. Bonesini;M. Calvi;A. De Min;F. Ferri;M. Paganoni;F. Paleari;M. Kirsanov;A. Bagulya;V. Grichine;N. Polukhina;P. N. Lebedev;V. Palladino;G. Barr;A. De Santo;C. Pattison;K. Zuber;F. Bobisut;D. Gibin;A. Guglielmi;M. Laveder;A. Menegolli;M. Mezzetto;J. Dumarchez;S. Troquereau;F. Vannucci;V. Ammosov;V. Gapienko;V. Koreshev;A. Semak;Y. Sviridov;V. Zaets;D. Orestano;M. Pasquali;F. Pastore;A. Tonazzo;L. Tortora;C. Booth;C. Buttar;P. Hodgson;L. Howlett;M. Bogomilov;M. Chizhov;D. Kolev;R. Tsenov;S. Piperov;P. Temnikov;M. Apollonio;P. Chimenti;G. Giannini;G. Santin;J. Burguet;Castell;J. J. Gómez;Cadenas;P. Novella;M. Sorel;A. Tornero;De Valencia;Spain

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本文介绍了在HARP实验中对带正电荷的介子的双微分产生截面d 2 σ π + /dpdΩ的精确测量。入射粒子是动量为12.9 GeV/c的质子撞击到核相互作用长度为5%的铝靶上。该截面的测量对K2K实验中中微子通量的计算有直接的应用价值。切割后，利用前向光谱仪重建的21万次径迹进行分析。给出了动量在0.75 GeV/c到6.5 GeV/c之间，角在30 ~ 210 mrad之间的次级粒子的计算结果。绝对归一化是使用预标束触发器计数靶上的质子。已知截面总体比例尺优于6%，平均点对点误差为8.2%。
A precision measurement of the double-differential production cross-section, d 2 σ π + /dpdΩ, for pions of positive charge, performed in the HARP experiment is presented. The incident particles are protons of 12.9 GeV/c momentum impinging on an aluminium target of 5% nuclear interaction length. The measurement of this cross-section has a direct application to the calculation of the neutrino flux of the K2K experiment. After cuts, 210 000 secondary tracks reconstructed in the forward spectrometer were used in this analysis. The results are given for secondaries within a momentum range from 0.75 GeV/c to 6.5 GeV/c, and within an angular range from 30 mrad to 210 mrad. The absolute normalization was performed using prescaled beam triggers counting protons on target. The overall scale of the cross-section is known to better than 6%, while the average point-to-point error is 8.2%.