Towards a lattice determination of the B*Bπ coupling | Zendy

UKQCD Collaboration | Zendy; Giulia Maria de Divitiis | Zendy; Luigi Del Debbio | Zendy; Massimo Di Pierro | Zendy; J. M. Flynn | Zendy; Chris Michael | Zendy; J. Peisa | Zendy

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Towards a lattice determination of the B*Bπ coupling

Author(s) -

UKQCD Collaboration,

Giulia Maria de Divitiis,

Luigi Del Debbio,

Massimo Di Pierro,

J. M. Flynn,

Chris Michael,

J. Peisa

Publication year - 1998

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/1998/10/010

Subject(s) - physics , meson , pion , particle physics , quark , lattice (music) , propagator , lattice field theory , quantum electrodynamics , lattice qcd , heavy quark effective theory , coupling (piping) , lagrangian , momentum (technical analysis) , quantum mechanics , mathematical physics , quantum chromodynamics , mechanical engineering , finance , acoustics , engineering , economics

The coupling gB*Bπ is related to the form factor at zero momentum of the axial current between B*- and B-states. This form factor is evaluated on the lattice using static heavy quarks and light quark propagators determined by a stochastic inversion of the fermionic bilinear. The gB*Bπ coupling is related to the coupling g between heavy mesons and low-momentum pions in the effective heavy meson chiral lagrangian. The coupling of the effective theory can therefore be computed by numerical simulations. We find the value g = 0.42(4)(8). Besides its theoretical interest, the phenomenological implications of such a determination are discussed.

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