B to rho ell nu form factors in lattice QCD

Details B to rho ell nu form factors in lattice QCD B to rho ell nu form factors in lattice QCD

2004-02-20

arxiv.org/abs/hep-lat/0402023v2

JHEP 0405:035,2004

Physics

High Energy Physics

High Energy Physics - Lattice

15 pages, 5 figures, corrected abstract, typos corrected

Scientific paper

10.1088/1126-6708/2004/05/035

We present results from quenched lattice QCD for the form factors for the decay $B\to\rho l\nu$. The calculations are performed using a nonperturbatively improved action and operators at two values of the lattice spacing. The bottom quark mass is reached by extrapolation from simulations performed with heavy quark masses around the charm mass. Our primary result is for the partially integrated decay rate $\Gamma_{PI}$ over the range $12.7\gev^2 < q^2 < 18.2\gev^2$: \Gamma_PI = (4.9^{+12}_{-10}{+0}_{-14}) X 10^12 s^-1

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