Exclusive decays $\chi_{cJ}\rightarrow K^{\ast} (892)K$ χ c J → K * ( 892 ) K within the effective field theory framework
| Autor: | Nikolay Kivel |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Quark
Physics Nuclear and High Energy Physics Particle physics 010308 nuclear & particles physics Infrared High Energy Physics::Lattice High Energy Physics::Phenomenology Hadron Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Amplitude 0103 physical sciences Effective field theory Nuclear fusion High Energy Physics::Experiment Gravitational singularity Spin symmetry 010306 general physics Astrophysics::Galaxy Astrophysics |
| Zdroj: | The European Physical Journal A. 54 |
| ISSN: | 1434-601X 1434-6001 |
| DOI: | 10.1140/epja/i2018-12582-6 |
| Popis: | We study hadronic decays $ \chi_{cJ}\rightarrow K^{\ast}(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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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