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

Ivanov, M.A. (Dubna, JINR) ; Körner, J.G. (Mainz U., Inst. Phys.) ; Tran, C.T. (Dubna, JINR)

Published in: Phys.Part.Nucl.Lett.
Year: 2017
Vol.: 14    Num./Issue: 5
Page No: 669-676
Pages: 8

Abstract: 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 ${{R\left( {{D^{\left( * \right)}}} \right) \equiv B\left( {{{\overline B }^0} \to {D^{\left( * \right)}}\tau \overline \upsilon } \right)} \mathord{\left/ {\vphantom {{R\left( {{D^{\left( * \right)}}} \right) \equiv B\left( {{{\overline B }^0} \to {D^{\left( * \right)}}\tau \overline \upsilon } \right)} {B\left( {{{\overline B }^0} \to {D^{\left( * \right)}}\mu \overline \upsilon } \right)}}} \right. \kern-\nulldelimiterspace} {B\left( {{{\overline B }^0} \to {D^{\left( * \right)}}\mu \overline \upsilon } \right)}}$ , as well as the branching $B\left( {{B^ - } \to \tau \overline \upsilon } \right)$ . The corresponding hadronic form factors and leptonic decay constants are calculated in the covariant confined quark model developed by us.

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DOI: 10.1134/S1547477117050053