Lattice QCD estimate of the ηc(2S) → J/ψγ decay rate

被引：17

作者：

Becirevic, Damir ^{[1
]}

Kruse, Michael ^{[2
]}

Sanfilippo, Francesco ^{[3
]}

机构：

[1] Univ Paris 11, Phys Theor Lab, F-91405 Orsay, France

[2] Ecole Normale Super, Dept Informat, F-75230 Paris, France

[3] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2015年 / 05期

关键词：

Lattice QCD; Heavy Quark Physics; TWISTED MASS FERMIONS; TRANSITIONS;

D O I：

10.1007/JHEP05(2015)014

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We compute the hadronic matrix element relevant to the physical radiative decay eta(c)(S) -> J/psi gamma by means of lattice QCD. We use the (maximally) twisted mass QCD action with N-f = 2 light dynamical quarks and from the computations made at four lattice spacings we were able to take the continuum limit. The value of the mass ratio m(eta c)(2s)/m(eta c)(1s) we obtain is consistent with the experimental value, and our prediction for the form factor is V-eta c(2s)-> J/psi gamma(0) equivalent to V-12(0) = 0.32(6)(2), leading to Gamma(eta(c)(2S) -> J/psi gamma) = (15.7 +/- 5.7) keV, which is much larger than Gamma(psi(2S) -> eta(c)gamma) and within reach of modern experiments.

引用

页数：19

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