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T: Fachverband Teilchenphysik

T 18: Flavourphysik (Theorie) 1

T 18.2: Talk

Thursday, March 1, 2012, 17:00–17:15, VG 3.102

Form Factors and Strong Couplings of Heavy Baryons from QCD Light-Cone Sum Rules — •Yuming Wang — Theoretical Physics 1, Department of Physics, Siegen University, 57068, Siegen, Germany

We derive QCD light-cone sum rules for the hadronic matrix elements of the heavy baryon transitions to nucleon. In the correlation functions the heavy baryons are interpolated by three-quark currents and the nucleon distribution amplitudes are used. To eliminate the contributions of negative parity heavy baryons, we combine the sum rules obtained from different kinematical structures. The results are then less sensitive to the choice of the interpolating current. We predict the Lambda(b) to p form factor and calculate the widths of the Lambda(b) to p l nu and Lambda(b) to p pi decays. Furthermore, we consider double dispersion relations for the same correlation functions and derive the light-cone sum rules for the Lambda(c) N D and Sigma(c) N D strong couplings. Their predicted values can be used in the models of charm production in proton-antiproton collisions.