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

Leibovich, Adam K. and Stewart, Iain W. (1998) Semileptonic Λb decay to excited Λc baryons at order ΛQCD/mQ. Physical Review D, 57 (9). pp. 5620-5631. ISSN 0556-2821.

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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.

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Additional Information:© 1998 by The American Physical Society. Received 10 November 1997; published 17 March 1998. We would like to thank Glenn Boyd, Martin Gremm, Zoltan Ligeti, Ira Rothstein, and Mark Wise for discussions. This work was supported in part by the Department of Energy under grant numbers DOE-ER-40682-138 and DE-FG03-92-ER 40701.
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Department of Energy (DOE)DOE-ER-40682-138
Department of Energy (DOE)DE-FG03-92-ER 40701
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11483
Deposited By: Tony Diaz
Deposited On:27 Aug 2008 23:59
Last Modified:08 May 2015 17:42

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