Decay Constants of Beauty Mesons from QCD Sum Rules

Autor(en)

Wolfgang Lucha, Dmitri Melikhov, Silvano Simula

Abstrakt

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(en)

Teilchenphysik

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW), Lomonosov Moscow State University (MSU), Istituto Nazionale di Fisica Nucleare (INFN), Roma

Anzahl der Seiten

6

DOI

https://doi.org/10.1051/epjconf/20148000046

Publikationsdatum

2014

Peer-reviewed

Ja

ÖFOS 2012

103034 Teilchenphysik

Schlagwörter

ASJC Scopus Sachgebiete

Physics and Astronomy(all)

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/decay-constants-of-beauty-mesons-from-qcd-sum-rules(85d5ce31-170e-4e8e-a478-09a1973fd206).html