Study on $η_{c2}(η_{b2})$ electromagnetic decay into double photons
Li Yang,
Wen-Long Sang,
Hong-Fei Zhang
et al.
Abstract:Within the framework of nonrelativistic QCD (NRQCD) factorization formalism, we compute the helicity amplitude as well as the decay width of η Q2 (Q = c, b) electromagnetic decay into two photons up to next-to-next-to-leading order (NNLO) in α s expansion. For the first time, we verify the validity of NRQCD factorization for the D-wave quarkonium decay at NNLO. We find that the O(α s ) and O(α 2 s ) corrections to the helicity amplitude are negative and moderate, nevertheless both corrections combine to suppre… Show more
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