Adam F. Falk

Heavy Meson Form-factors From {QCD}

Abstract We calculate the leading QCD radiative corrections to the relations which follow from the decoupling of the heavy quark spin as the quark mass goes to infinity and from the symmetry between systems with different heavy quarks. One of the effects we calculate gives the leading q2-dependence of the form factor of a heavey quark, which in turn dominates the q2-dependence of the form factors of bound states of the heavy quark with light quarks. This, combined with the normalization of the form factor provided by symmetry, gives us a first principles calculation of the heavy meson (or baryon) form factors in the limit of very large heavy quark mass.

Second-order power corrections in the heavy-quark effective theory. I. Formalism and meson form factors.

In the heavy-quark effective theory, hadronic matrix elements of currents between two hadrons containing a heavy quark are expanded in inverse powers of the heavy-quark masses, with coefficients that are functions of the kinematic variable

Nonperturbative contributions to the inclusive rare decays B-->Xs gamma and B-->Xsl+l-

vifmmodecdotelsetextperiodcenteredfi{}{v}^{ensuremath{}}

Leading mass corrections to the heavy quark effective theory

. For the ground-state pseudoscalar and vector mesons, this expansion is constructed at order

Hadrons of arbitrary spin in the heavy-quark effective theory☆

frac{1}{{m}_{Q}^{2}}

Strong decays of excited heavy mesons in chiral perturbation theory

. A minimal set of universal form factors is defined in terms of matrix elements of higher-dimensional operators in the effective theory. The zero recoil normalization conditions following from vector current conservation are derived. Several phenomenological applications of the general results are discussed in detail. It is argued that at zero recoil the semileptonic decay rates for

Hadron spectra for semileptonic heavy quark decay

Bensuremath{rightarrow}Densuremath{ell}ensuremath{nu}

Production, decay, and polarization of excited heavy hadrons

and

Power corrections to leading logs and their application to heavy quark decays

Bensuremath{rightarrow}{D}^{*}ensuremath{ell}ensuremath{nu}

Second-order power corrections in the heavy-quark effective theory. II. Baryon form factors

receive only small second-order corrections, which are unlikely to exceed the level of a few percent. This supports the usefulness of the heavy-quark expansion for a reliable determination of