Heavy-Quark Mass and Heavy-Meson Decay Constants from QCD Sum Rules

Journal Article · Mon May 23 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3575035· OSTI ID:21513327

Lucha, Wolfgang ^[1]; Melikhov, Dmitri ^[1]; Simula, Silvano ^[2]

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1. Institute for High Energy Physics, Austrian Academy of Sciences, Nikolsdorfergasse 18, A-1050 Vienna (Austria)
2. NFN, Sezione di Roma III, Via della Vasca Navale 84, I-00146 Roma (Italy)

We present a sum-rule extraction of decay constants of heavy mesons from the two-point correlator of heavy-light pseudoscalar currents. Our primary concern is to control the uncertainties of the decay constants, induced by both input QCD parameters and limited accuracy of the sum-rule method. Gaining this control is possible by applying our novel procedure for the extraction of hadron observables utilizing Borel-parameter-depending dual thresholds. For the charmed mesons, we obtain f{sub D} (206.2{+-}7.3{sub (OPE){+-}}5.1{sub (syst)}) MeV and f{sub D{sub s}} (245.3{+-}15.7{sub (OPE){+-}}4.5{sub (syst)}) MeV. In the case of the beauty mesons, the decay constants prove to be extremely sensitive to the exact value of the b-quark MS mass m-bar{sub b}(m-bar{sub b}). By matching our sum-rule prediction for f{sub B} to the lattice outcomes, the very accurate b-mass value m-bar{sub b}(m-bar{sub b}) = (4.245{+-}0.025) GeV is found, which yields f{sub B} = (193.4{+-}12.3{sub (OPE){+-}}4.3{sub (syst)}) MeV and f{sub B{sub s}} (232.5{+-}18.6{sub (OPE){+-}}2.4{sub (syst)}) MeV.

• OSTI ID: 21513327
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1343; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
B QUARKS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
C QUARKS
CHARM PARTICLES
CHARMED MESONS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
EQUATIONS
EXTRACTION
FERMIONS
FIELD THEORIES
FORECASTING
GEV RANGE
GEV RANGE 01-10
HADRONS
MASS
MESONS
MEV RANGE
PARTICLE DECAY
PERTURBATION THEORY
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
SEPARATION PROCESSES
SUM RULES
T QUARKS
TOP PARTICLES