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Published August 2014 | Published + Submitted
Journal Article Open

Radial excitations of heavy-light mesons from QCD sum rules

Abstract

QCD sum rules are commonly used to predict the characteristics of ground-state hadrons. We demonstrate that two-point sum rules for the decay constants of charmed ( D^(∗),D^(∗)_s ) and bottom ( B^(∗),B^(∗)_s ) mesons can also be modified to estimate the decay constants of the first radial excitations, D^(∗)′,D^(∗)′_s and B^(∗)′,B^(∗)′_s , respectively, provided the masses of these resonances are used as an input. For the radially excited charmed mesons we use available experimental data, whereas the masses of analogous bottom mesons are estimated from the heavy-quark limit. The decay constants predicted for the radial excitations of heavy-light pseudoscalar and vector mesons are systematically smaller than those of the ground states and we comment on the possible origin of this difference. Our results can be used in the sum rule calculations of heavy-to-light form factors and in the factorization approximations for nonleptonic B -meson decays where the decay constants of charmed mesons enter as input parameters.

Additional Information

© 2014 The Authors. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. Funded by SCOAP3 / License Version CC BY 4.0. Received: 5 May 2014; Accepted: 10 July 2014. We thank Thorsten Feldmann for useful comments and Danny van Dyk for a discussion of the statistical analysis. This work is supported by DFG Research Unit FOR 1873 "Quark Flavour Physics and Effective Theories", Contract No. KH 205/2-1. This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited. Funded by SCOAP3 / License Version CC BY 4.0.

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Published - art_10.1140_epjc_s10052-014-2979-z.pdf

Submitted - 1404.5891v2.pdf

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August 23, 2023
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