Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-10-29
Phys.Rev. D55 (1997) 3027-3037
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, revtex, 5 figures included using epsf. Some references added; to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.55.3027
We calculate near zero recoil the order $\alpha_s$ corrections to the Bjorken and Voloshin sum rules that bound the $B\to D^{(*)}\ell\bar\nu$ form factors. These bounds are derived by relating the result of inserting a complete set of physical states in a time ordered product of weak currents to the operator product expansion. The sum rules sum over physical states with excitation energies less than a scale $\Delta$. We find that the corrections to the Bjorken bound are moderate, while the Voloshin bound receives sizable corrections enhanced by $\Delta/\Lambda_{QCD}$. With some assumptions, we find that the slope parameter for the form factor $h_{A_1}$ in $B\to D^*\ell\bar\nu$ decay satisfies $0.4\lesssim\rho_{A_1}^2 \lesssim 1.3$.
Boyd Glenn C.
Ligeti Zoltan
Rothstein Ira Z.
Wise Mark B.
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