The β-term for D^* --> D γwithin a heavy-light chiral quark model

Details The β-term for D^* --> D γwithin a heavy-light chiral quark model The β-term for D^* --> D γwithin a heavy-light chiral quark model

2003-04-25

arxiv.org/abs/hep-ph/0304247v1

Eur.Phys.J.C39S1:27-35,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 5 figures

Scientific paper

10.1140/epjcd/s2004-01-003-1

We present a calculation of the \beta-term for D^* --> D gamma within a heavy-light chiral quark model. Within the model, soft gluon effects in terms of the gluon condensate with lowest dimension are included. Also, calculations of 1/m_c corrections are performed. We find that the value of \beta is rather sensitive to the constituent quark mass compared to other quantities calculated within the same model. Also, to obtain a value close to the experimental value, one has to choose a constituent light quark mass larger than for other quantities studied in previous papers. For a light quark mass in the range 250 to 300 MeV and a quark condensate in the range -(250-270 MeV)^3 we find the value (2.5 +- 0.6) GeV^-1. This value is in agreement with the value of \beta extracted from experiment 2.7 +- 0.2 GeV^-1.

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