Study of η-production reaction π-p→ηn in the near-threshold region

被引：3
|
作者：
Bayadilov, D. E. [1 ]
Beloglazov, Yu. A. [1 ]
Gridnev, A. B. [1 ]
Kozlenko, N. G. [1 ]
Kruglov, S. P. [1 ]
Kulbardis, A. A. [1 ]
Lopatin, I. V. [1 ]
Novinsky, D. V. [1 ]
Radkov, A. K. [1 ]
Sumachev, V. V. [1 ]
Filimonov, E. A. [1 ]
机构：
[1] Petersburg Nucl Phys Inst, Gatchina, Russia
来源：
EUROPEAN PHYSICAL JOURNAL A | 2008年 / 35卷 / 03期
关键词：
13.60.Le Meson production; 13.20.Jf Decays of mesons;
D O I：
10.1140/epja/i2007-10564-5
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The differential cross-sections (DCS) of the eta-production reaction pi(-) p -> eta n are measured at momenta of incident pi(-) mesons (700, 710 and 720MeV/c) close to the threshold of this reaction. The experiment is carried out at the pion channel of the PNPI synchrocyclotron (with the momentum spread of the pion beam equal to 1.5%) using the Neutral Meson Spectrometer (NMS) designed and created at the Meson Physics Laboratory for detecting two photons from the decay eta -> 2 gamma . This spectrometer consisting of two electromagnetic total absorption calorimeter (24 CsI(Na) crystals in each calorimeter) allowed to obtain the DCS in the whole angular range from 0 degrees to 180 degrees in the c.m.s. It is shown that at 700MeV/c the DCS angular dependence is isotropic, indicating on the S -wave character of the eta-production process while at higher momenta a significant contribution of the D-wave has led to the anisotropic angular dependence having a bowl-like shape.
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收藏
页码：287 / 290
页数：4
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