Phys. Rev. D 81, 074015 (2010) [10 pages]

Isgur-Wise function within a modified heavy-light chiral quark model

Abstract

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Jan O. Eeg^1,* and Krešimir Kumerički^2,†
¹Department of Physics, University of Oslo, P. O. Box 1048 Blindern, N-0316 Oslo, Norway
²Department of Physics, Faculty of Science, University of Zagreb, P. O. Box 331, HR-10002 Zagreb, Croatia

Received 22 December 2009; published 16 April 2010

We consider the Isgur-Wise function ξ(ω) within a new modified version of a heavy-light chiral quark model. While early versions of such models gave an absolute value of the slope that was too small, namely ξ^′(1)≃-0.4 to -0.3, we show how extended version(s) may lead to values around -1, in better agreement with recent measurements. This is obtained by introducing a new mass parameter in the heavy-quark propagator. We also shortly comment on the consequences for the decay modes B→DD̅ .

URL:

http://link.aps.org/doi/10.1103/PhysRevD.81.074015

DOI:

10.1103/PhysRevD.81.074015

PACS:

13.20.He, 12.39.-x, 12.39.Fe, 11.30.Rd

^*Corresponding author.

j.o.eeg@fys.uio.no

^†kkumer@phy.hr

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Phys. Rev. D 81, 074015 (2010) [10 pages]

Isgur-Wise function within a modified heavy-light chiral quark model