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), University of Vienna, 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
- General Physics and Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/85d5ce31-170e-4e8e-a478-09a1973fd206