Nuclear and Particle Physics Colloquium 22
Place: Room 316, Old Main Building, Beihang University
Time: 08:30-10:00, November 18, 2015
Title: Testing the nature of resonances in B, D, Lambda_b weak decays and Pentaquarks of hidden charm
Speaker: Prof. Eulogio Oset, IFIC and Valencia University, Spain
In this talk I will address several problems related to B, D and Lambda_b weak decay into three final hadrons where several resonances are clearly seen. Some of them are peculiar and do not correspond to ordinary mesons and baryons, of q qbar or qqq nature, but they are more complex structures, like the f0(980),a0(980), kappa(800) and Lambda(1405). I will show how to interpret the experimental results, mostly from LCHb, with elements of the chiral unitary approach, and how these experiments offer a new insight on the structure of these hadrons.
I will address the Lambda_b -> J/psi K- p decay from this perspective, done before the LHCb experiment, where a contribution from the Lambda(1405) was predicted, and compare with the results of the experiment. I will also show results for a baryon of hidden charm predicted before the experiment and then our interpretation of the pentaquark signals seen in the experiment.
I will also show results for the Lambda_b -> J/psi pi- p decay, where a peak in the J/psi p mass distribution is seen, which has repercussion on possible mechanisms suggested to explain the "pentaquark" peak of the recent LHCb experiment.