Exclusive semileptonic decays of bottom and charm baryons are considered within a relativistic three-quark model with a Gaussian shape for the baryon-three-quark vertex and standard quark propagators. We calculate the baryonic Isgur-Wise functions, decay rates and asymmetry parameters. PACS: 12.39.Ki, 13.30.Ce, 14.20.Lq, 14.20.Mr

Recent calculations are presented of top quark polarization in t ¯ t pair production close to threshold. S–P-wave interference gives contributions to all components of the top quark polarization vector. Rescattering of the decay products is considered. Moments of the fourmomentum of the charged lepton in semileptonic top decays are calculated and shown to be very sensitive to the top quark pola...

A bstract Within a chiral SU(15) gauge theory in which the Standard Model fermions are bound states of massless preons, we show that proton-decay operators likely induced at compositeness scale, Λ pre . Our estimate limit imposed by searches for proton decays is &gt; 10 4 TeV 1 / 2 $$ {C}_8^{1/4}\ {m}_{\mathcal{Q}}^{1/2} <m...