THE Z → c (c)over bar → γγ*, Z → b(b)over bar → γγ* TRIANGLE DIAGRAMS AND THE Z → γψ, Z → γγ DECAYS

被引:0
|
作者
Achasov, N. N. [1 ]
机构
[1] RAS, Siberian Branch, Sobolev Inst Math, Novosibirsk, Russia
基金
俄罗斯基础研究基金会;
关键词
Z-boson radiative decay; heavy quark; triangle diagram; AXIAL-ANOMALY POLE; RARE;
D O I
10.1007/s11232-012-0005-x
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We expounded an approach for studying the Z -> gamma psi and Z -> gamma gamma decay based on the sum rules for the Z -> c (c)over bar -> gamma gamma*, Z -> b(b)over bar -> gamma gamma* amplitudes and their derivatives. We calculate the branching ratios of the Z -> gamma psi and Z -> gamma gamma decays under different suppositions about the saturation of the sum rules. We find the lower bounds of I pound (psi) BR(Z -> gamma psi) = 1.95 center dot 10 (-7) and I pound (gamma) BR(Z -> gamma gamma) = 7.23 center dot 10(-7) and discuss deviations from the lower bounds including the possibility of BR[Z -> gamma J/psi(1S)] similar to BR[Z -> gamma gamma(1S)] similar to 10 (-6) , which is probably measurable at the LHC. Moreover, we calculate the angle distributions in the Z -> gamma psi and Z -> gamma gamma decays.
引用
收藏
页码:39 / 51
页数:13
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