Lattice QCD Study of B-meson Decay Constants from ETMC

A. Bussone , N. Carrasco , P. Dimopoulos , R. Frezzotti , V. Gim\'enez , G. Herdo\'iza , P. Lami , V. Lubicz

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C. Michael E. Picca L. Riggio G.C. Rossi F. Sanfilippo A. Shindler S. Simula C. Tarantino

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classification ✦ hep-lat hep-ph

keywords constantsdecaylatticemesonsimulationsaccountallowaround

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We discuss a lattice QCD computation of the $B$-meson decay constants by the ETM collaboration where suitable ratios allow to reach the bottom quark sector by combining simulations around the charm-quark mass with an exactly known static limit. The different steps involved in this ratio method are discussed together with an account of the assessment of various systematic effects. A comparison of results from simulations with two and four flavour dynamical quarks is presented.

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Lattice QCD Study of B-meson Decay Constants from ETMC

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