χcJ → e+e− decays revisited

A bstract We present a calculation of the width for χ cJ → e + e − decay. The amplitude of the process is computed within the NRQCD framework. The leading-order contribution is described by two terms associated with the two different integration domains in the electromagnetic loop describing two-pho...

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Bibliographic Details
Published in:The journal of high energy physics 2016-02, Vol.2016 (2), Article 32
Main Authors: Kivel, N., Vanderhaeghen, M.
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Elementary Particles
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Experimental Physics
Relativity Theory
String Theory
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Summary:A bstract We present a calculation of the width for χ cJ → e + e − decay. The amplitude of the process is computed within the NRQCD framework. The leading-order contribution is described by two terms associated with the two different integration domains in the electromagnetic loop describing two-photon annihilation of the heavy quark-antiquark pair. The corresponding operators are defined in the framework of NRQCD. The matrix element of one of these operators describes a configuration with an ultrasoft photon and can be associated with the higher Fock state of the heavy meson. In order to compute this contribution we use the heavy hadron chiral perturbation theory. We obtain that this contribution is numerically dominant. The obtained estimates for the decay widths of the χ c 1 and χ c 2 states are 0 . 09 eV and 0 . 07 eV, respectively.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP02(2016)032