RADIATIVE DECAY OF VECTOR QUARKONIUM - CONSTRAINTS ON GLUEBALLS AND LIGHT GLUINOS

被引:50
作者
CAKIR, MB [1 ]
FARRAR, GR [1 ]
机构
[1] RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855
来源
PHYSICAL REVIEW D | 1994年 / 50卷 / 05期
关键词
D O I
10.1103/PhysRevD.50.3268
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Given a resonance of known mass, width, and J(PC), we can determine its gluonic branching fraction b(R-->gg) from data on its production in radiative vector quarkonium decay V --> gamma R. For most resonances b(R-->gg) is found to be similar to 10%, consistent with being q ($) over bar q states, but we find that both pseudoscalars-observed in the 1440 MeV region have b(R-->gg) similar to 1/2 - 1 and b(f(0++) --> gg) similar to 1/2. As data improve, b(R-->gg) should be a useful discriminator between q ($) over bar q and gluonic states and may permit quantitative determination of the extent to which a particular resonance is a mixture of glueball and qa. We also examine the regime of validity of PQCD for predicting the rate of V --> gamma eta ($) over bar g, the ''extra'' pseudoscalar bound state which would exist if there were light gluinos. From the CUSB limit on peaks in Upsilon --> gamma X, the mass range 3 GeV less than or similar to m(eta ($) over bar g) similar to 7 GeV can be excluded. An experiment must be significantly more sensitive to exclude an eta ($) over bar g lighter than this.
引用
收藏
页码:3268 / 3278
页数:11
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