Heavy meson masses and decay constants from relativistic heavy quarks in full lattice QCD

McNeile, C., Davies, C.T.H. , Follana, E., Hornbostel, K. and Lepage, G.P. (2012) Heavy meson masses and decay constants from relativistic heavy quarks in full lattice QCD. Physical Review D, 86(7), 074503. (doi: 10.1103/PhysRevD.86.074503)

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Abstract

We determine masses and decay constants of heavy-heavy and heavy-charm pseudoscalar mesons as a function of heavy quark mass using a fully relativistic formalism known as highly improved staggered quarks for the heavy quark. We are able to cover the region from the charm quark mass to the bottom quark mass using MILC ensembles with lattice spacing values from 0.15 fm down to 0.044 fm. We obtain fBc=0.427(6)  GeV; mBc=6.285(10)  GeV and fηb=0.667(6)  GeV. Our value for fηb is within a few percent of fΥ, confirming that spin effects are surprisingly small for heavyonium decay constants. Our value for fBc is significantly lower than potential model values being used to estimate production rates at the LHC. We discuss the changing physical heavy-quark mass dependence of decay constants from heavy-heavy through heavy-charm to heavy-strange mesons. A comparison between the three different systems confirms that the Bc system behaves in some ways more like a heavy-light system than a heavy-heavy one. Finally we summarize current results on decay constants of gold-plated mesons.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Follana, Dr Eduardo and McNeile, Dr Craig and Davies, Professor Christine
Authors: McNeile, C., Davies, C.T.H., Follana, E., Hornbostel, K., and Lepage, G.P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:1550-7998
Published Online:02 October 2012
Copyright Holders:Copyright © 2012 American Physical Society
First Published:First published in Physical Review D 86(7):074503
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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