Looking for new physics in leptonic and semileptonic decays of B-meson

We probe possible new physics (NP) effects beyond the standard model (SM) in the decays ({overline B ^0} to pi tau overline upsilon ,{overline B ^0} to rho tau overline upsilon ,and{overline B ^0} to tau overline upsilon ), based on an effective Hamiltonian including non-SM operators. Experimental constraints on different NP scenarios are provided by recent measurements of the ratios ({{Rleft( {{D^{left( * right)}}} right) equiv Bleft( {{{overline B }^0} to {D^{left( * right)}}tau overline upsilon } right)} mathord{left/ {vphantom {{Rleft( {{D^{left( * right)}}} right) equiv Bleft( {{{overline B }^0} to {D^{left( * right)}}tau overline upsilon } right)} {Bleft( {{{overline B }^0} to {D^{left( * right)}}mu overline upsilon } right)}}} right. kern-nulldelimiterspace} {Bleft( {{{overline B }^0} to {D^{left( * right)}}mu overline upsilon } right)}}), as well as the branching (Bleft( {{B^ - } to tau overline upsilon } right)). The corresponding hadronic form factors and leptonic decay constants are calculated in the covariant confined quark model developed by us.