Decay Constants of Beauty Mesons from QCD Sum Rules

Author(s)
Wolfgang Lucha, Dmitri Melikhov, Silvano Simula
Abstract

Our recently completed analysis of the decay constants of both pseudoscalar and vector beauty mesons reveals that in the bottom- quark sector two specific features of the sum- rule predictions show up: ( i) For the input value of the bottom- quark mass in the (MS) over bar scheme (mb) over bar((mb) over bar) approximate to 4.18 GeV, the sum-rule result f(B) approximate to 210- 220 MeV for the B meson decay constant is substantially larger than the recent lattice- QCD finding f(B) approximate to 190 MeV. Requiring QCD sum rules to reproduce the lattice- QCD value of fB yields a significantly larger b-quark mass: (mb) over bar((mb) over bar) = 4.247 GeV. ( ii) Whereas QCD sum- rule predictions for the charmed- meson decay constants f(D), f(Ds), f(D)* and f(D)*(s) are practically independent of the choice of renormalization scale, in the beauty sector the results for the decay constantsand especially for the ratio f(B)*/f(B)-prove to be very sensitive to the specific scale setting.

Organisation(s)
Particle Physics
External organisation(s)
Österreichische Akademie der Wissenschaften (ÖAW), Universität Wien, Anuchin Research Institute and Museum of Anthropology, Istituto Nazionale di Fisica Nucleare (INFN), Roma
No. of pages
6
DOI
https://doi.org/10.1051/epjconf/20148000046
Publication date
2014
Peer reviewed
Yes
Austrian Fields of Science 2012
103034 Particle physics
Keywords
ASJC Scopus subject areas
Physics and Astronomy(all)
Portal url
https://ucris.univie.ac.at/portal/en/publications/decay-constants-of-beauty-mesons-from-qcd-sum-rules(85d5ce31-170e-4e8e-a478-09a1973fd206).html