B decay constants from NRQCD with dynamical fermions

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.55.1630· OSTI ID:450561

Collins, S; Heller, U M; Sloan, J H ^[1]; Shigemitsu, J ^[2]; Khan, A A; Davies, C T ^[3]

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1. SCRI, Florida State University, Tallahassee, Florida 32306-4052 (United States)
2. The Ohio State University, Columbus, Ohio 43210 (United States)
3. University of Glasgow, Glasgow, G12 8QQ (Scotland)

We present a lattice investigation of the heavy-light meson decay constants using Wilson light quarks and NRQCD heavy quarks, partially including the effects of dynamical sea quarks. We calculate the pseudoscalar and vector decay constants over a wide range in heavy quark mass and are able to perform a detailed analysis of heavy quark symmetry. We find consistency between the extrapolation of the NRQCD results and the static case, as expected. We find the slope of the decay constants with 1/M is significantly larger than naive expectations and the results of previous lattice calculations. For the first time we extract the nonperturbative coefficients of the slope arising from the O(1/M) heavy quark interactions separately and show the kinetic energy of the heavy quark is dominant and responsible for the large slope. In addition, we find that significant systematic errors remain in the decay constant extracted around the B meson mass due to truncating the NRQCD series at O(1/M). We estimate the higher order contributions to f{sub B} are approximately 20{percent}, roughly the same size as the systematic errors introduced by using the Wilson action for light quarks. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 450561
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 3 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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