Heavy Baryons and electromagnetic decays

Details Heavy Baryons and electromagnetic decays Heavy Baryons and electromagnetic decays

2000-10-25

arxiv.org/abs/hep-ph/0010285v2

Nucl.Phys.Proc.Suppl. 93 (2001) 46-49

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk presented at 4^{th} International Conference Hyperons, Charm and Beauty Hadrons Conference, Valencia June 2000

Scientific paper

10.1016/S0920-5632(00)01057-4

In this talk I review the theory of electromagnetic decays of the ground state baryon multiplets with oneheavy quark, calculated using Heavy Hadron Chiral Perturbation Theory. The M1 and E2 amplitudes for (S^{*}-> S gamma), (S^{*} -> T gamma) and (S -> T gamma)are separately analyzed. All M1 transitions are calculated up to O(1/\Lambda_\chi^2). The E2 amplitudes contribute at the same order for (S^{*}-> S gamma), while for (S^{*} -> T gamma) they first appear at O(1/(m_Q \Lambda_\chi^2))and for (S -> T gamma) are completely negligible. Once the loop contributions is considered, relations among different decay amplitudes are derived. Furthermore, one can obtain an absolute prediction for the widths of Xi^{0'(*)}_c-> Xi^{0}_c gamma and Xi^{-'(*)}_b-> Xi^{-}_b gamma.

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