Υ(1S)→γf2(1270) decay

被引：1
作者：
Li, Bing An [1 ]
机构：
[1] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
来源：
PHYSICAL REVIEW D | 2009年 / 80卷 / 11期
关键词：
TENSOR GLUEBALL; LATTICE; SCALAR; MESON;
D O I：
10.1103/PhysRevD.80.117501
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Decay Upsilon(1S)->gamma f(2)(1270) is studied by an approach in which the tensor meson, f(2)(1270), is strongly coupled to gluons. Besides the strong suppression of the amplitude Upsilon(1S)->gamma gg, gg -> f(2) by the mass of the b-quark, d-wave dominance in Upsilon(1S)->gamma f(2)(1270) is revealed from this approach, which provides a large enhancement. The combination of these two factors leads to larger B(Upsilon(1S)->gamma f(2)(1270)). The decay rate of Upsilon(1S)->gamma f(2)(1270) and the ratios of the helicity amplitudes are obtained and they are in agreement with the data.
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