Semileptonic Λb decay to excited Λc baryons at order ΛQCD/mQ

Adam K. Leibovich and Iain W. Stewart
Phys. Rev. D 57, 5620 – Published 1 May 1998
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Abstract

Exclusive semileptonic Λb decays to excited charmed Λc baryons are investigated at order ΛQCD/mQ in the heavy quark effective theory. The differential decay rates are analyzed for the Jπ=1/2 Λc(2593) and the Jπ=3/2 Λc(2625). They receive 1/mc,b corrections at zero recoil that are determined by mass splittings and the leading order Isgur-Wise function. With some assumptions, we find that the branching fraction for Λb decays to these states is 2.5–3.3%. The decay rate to the helicity ±3/2 states, which vanishes for mQ, remains small at order ΛQCD/mQ since 1/mc corrections do not contribute. Matrix elements of weak currents between a Λb and other excited Λc states are analyzed at zero-recoil to order ΛQCD/mQ. Applications to baryonic heavy quark sum rules are explored.

  • Received 10 November 1997

DOI:https://doi.org/10.1103/PhysRevD.57.5620

©1998 American Physical Society

Authors & Affiliations

Adam K. Leibovich

  • California Institute of Technology, Pasadena, California 91125
  • Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213

Iain W. Stewart

  • California Institute of Technology, Pasadena, California 91125

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Issue

Vol. 57, Iss. 9 — 1 May 1998

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