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arXiv · 1804.11289

Exclusive decays $\chi_{cJ}\to K^*(892)K$ within the effective field theory framework

Nikolay Kivel
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Abstract

We study hadronic decays $\chi_{cJ}\rightarrow K^*(892)\bar{K} $ within the effective field theory framework. We consider the colour-singlet and colour-octet contributions and study their properties using (p)NRQCD effective theory. We show that infrared singularities in collinear integrals of the colour-singlet amplitudes can be absorbed into the renormalisation of the colour-octet matrix elements. The heavy quark spin symmetry allows us to establish a relation between the colour-octet matrix elements and to define the spin symmetry breaking corrections which are free from infrared singularities. We apply obtained results for a phenomenological description of the branching fractions.

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Nikolay Kivel. 2018-04-30. Exclusive decays $\chi_{cJ}\to K^*(892)K$ within the effective field theory framework. https://doi.org/10.1140/epja/i2018-12582-6

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