Nonresonant semileptonic heavy quark decay

Hadron spectra for semileptonic heavy quark decay.

We calculate the leading perturbative and power corrections to the hadronic invariant mass and energy spectra in semileptonic heavy hadron decays. We apply our results to the B system. Moments of the invariant mass spectrum, which vanish in the parton model, probe gluon bremsstrahlung and nonperturbative effects. Combining our results with recent data on B meson branching ratios, we obtain a lo...

Doubly heavy quark baryon spectroscopy and semileptonic decay

Working in the framework of a nonrelativistic quark model we evaluate the spectra and semileptonic decay widths for the ground state of doubly heavy Ξ and Ω baryons. We solve the three-body problem using a variational ansatz made possible by the constraints imposed by heavy quark spin symmetry. In order to check the dependence of our results on the inter-quark interaction we have used five diff...

Semileptonic baryon decays with a heavy quark.

The semileptonic decay of spin-l/2 baryons is examined in the spectator quarkmodel, with special attention given to Ab + A,ev and nb + &ev. The polarization of the virtual-W and of the daughter baryon is also considered, along with the joint angular distribution between the charged lepton and the daughter baryon polarization vector. The Ab decays with about equal mixtures of transverseto longit...

Perturbative Strong Interaction Corrections to the Heavy Quark Semileptonic Decay Rate

We calculate the part of the order αs correction to the semileptonic heavy quark decay rate proportional to the number of light quark flavors, and use our result to set the scale for evaluating the strong coupling in the order αs term according to the scheme of Brodsky, Lepage and Mackenzie. Expressing the decay rate in terms of the heavy quark pole mass mQ, we find the scale for the MS strong ...

Heavy Quark Spectroscopy and Decay