We present a precise lattice computation of masses and decay constants of pseudoscalar and vector heavy-light mesons with m ℓ = m u/d, m s and m h in the range (m c, ∼ 3m c). We employ the ETMC gauge configurations with both N f = 2 and N f = 2 + 1 + 1 dynamical quarks and the ETMC ratio method to reach the b-quark mass. In the case of the vector decay constants an unusual quenching effect of the strange quark is observed. Specific masses combinations are then analyzed in terms of the Heavy Quark Expansion (HQE) to extract matrix elements up to dimension-6, including , and and with a good precision. These parameters play a crucial role in the inclusive determination of the V ub and V cb matrix elements.
Gambino, P., Lubicz, V., Melis, A., Simula, S. (2019). Masses, decay constants and HQE matrix elements of pseudoscalar and vector heavy-light mesons in LQCD. In Journal of Physics: Conference Series (pp.012005). DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND : Institute of Physics Publishing [10.1088/1742-6596/1137/1/012005].
Masses, decay constants and HQE matrix elements of pseudoscalar and vector heavy-light mesons in LQCD
GAMBINO, PAOLO;Lubicz V.;Simula S.
2019-01-01
Abstract
We present a precise lattice computation of masses and decay constants of pseudoscalar and vector heavy-light mesons with m ℓ = m u/d, m s and m h in the range (m c, ∼ 3m c). We employ the ETMC gauge configurations with both N f = 2 and N f = 2 + 1 + 1 dynamical quarks and the ETMC ratio method to reach the b-quark mass. In the case of the vector decay constants an unusual quenching effect of the strange quark is observed. Specific masses combinations are then analyzed in terms of the Heavy Quark Expansion (HQE) to extract matrix elements up to dimension-6, including , and and with a good precision. These parameters play a crucial role in the inclusive determination of the V ub and V cb matrix elements.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
