MESON PRODUCTION FROM DIFFRACTIVE PION DISSOCIATION AT COMPASS

被引：1
作者：
Weitzel, Quirin [1 ]
机构：
[1] Tech Univ Munich, Phys Dept E18, D-85748 Garching, Germany
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2009年 / 24卷 / 2-3期
关键词：
Exotic mesons; diffractive dissociation; partial wave analysis; COMPASS;
D O I：
10.1142/S0217751X09043900
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：
Diffractive dissociation reactions at COMPASS provide clean access to mesons with masses below approximate to 2.5GeV/c(2). This paper presents a partial wave analysis of about 420 000 pi Pb- -> pi(-)pi(-)pi(+) Pb events at 190 GeV/c beam momentum and with four-momentum transfer t' is an element of [0.1, 1] GeV2/c(2). The well-known a(1)(1260), a(2)(1320) and pi(2)(1670) mesons are resolved with high quality. Also the less established states pi(1800) and a(4)(2040) are seen. In addition, a resonance in the spin-exotic J(PC) = 1(-+) wave is observed. A mass-dependent fit results in a mass and width of 1.660(-0.074)(+0.010) and 0.269(-0.085)(+0.063) GeV/c(2), respectively, which is consistent with the disputed hybrid candidate pi(1)(1600).
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页码：484 / 487
页数：4
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