SU(3) Corrections to B -> D l nu Form Factors at O(1/M)

Details SU(3) Corrections to B -> D l nu Form Factors at O(1/M) SU(3) Corrections to B -> D l nu Form Factors at O(1/M)

1995-02-16

arxiv.org/abs/hep-ph/9502311v1

Nucl.Phys. B451 (1995) 177-193

Physics

High Energy Physics

High Energy Physics - Phenomenology

uuencoded, 24 pages, 6 eps figures, uses lanlmac/harvmac (suggest `b' size) and epsf.tex (if you want auto-insertion of figs).

Scientific paper

10.1016/0550-3213(95)00339-T

We compute the O(1/M,m_s) heavy quark and SU(3) corrections to B_s -> D_s e nu form factors. In the limit of vanishing light quark mass, B_s -> D_s e nu form factors are given in terms of the the B -> D e nu form factors, the leading order chiral parameter g, and two O(1/M) chiral parameters $g_1$ and $g_2$. All the chiral parameters can be extracted, in principle, from other heavy meson decays. Analytic counterterms proportional to the strange quark mass are presented for completeness, but no predictive power remains when they are included. Anomalously large loop corrections warn of poor convergence of the heavy quark chiral symmetry expansion for these processes. This suggests that naive extrapolations of B \to D form factors relying on heavy quark and chiral symmetries, as often used in monte carlo simulations of lattice QCD, may incur large errors.

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