Masses and decay constants of D(s)* and B(s)* mesons with Nf = 2 + 1 + 1 twisted mass fermions

Abstract

We present a lattice calculation of the masses and decay constants of D * (s) and B * (s) mesons using the gauge configurations produced by the European Twisted Mass Collaboration (ETMC) with N f = 2 + 1 + 1 dynamical quarks at three values of the lattice spacing a ∼ (0.06 − 0.09) fm. Pion masses are simulated in the range M π (210 − 450) MeV, while the strange and charm sea-quark masses are close to their physical values. We compute the ratios of vector to pseudoscalar masses and decay constants for various values of the heavyquark mass m h in the range 0.7m phys c m h 3m phys c

Strong Isospin Breaking in the Decay Constants of Heavy-Light Mesons from Local-Duality QCD Sum Rules

“…to related lattice-QCD results f H (m ud ) and f H (m s ) at a physical quark mass [26,27]. Figures 3 and 4 then yield, in nearly perfect agreement with the conventional findings [28], the f H q differences [2-5] (m ud ), for the light-quark mass m q varying in the interval (0, m s ), resulting from the three ansatzes considered by Ref.…”

Local-duality QCD sum rules for strong isospin breaking in the decay constants of heavy–light mesons

“…(1.1) for N = 0 and N = 1, using in its l.h.s. the results of recent lattice QCD simulations for f B * [13] and the experimental value for M B * [14]. Figure 1(b) shows the truncated series of power corrections including operators of dimension up to 6 for both N = 0 and N = 1.…”

“…the leading order (LO), NLO and NNLO perturbative contributions and the condensates up to dimension 6, while the l.h.s. is calculated adopting the known values for fB *[13] and MB *[14]. (b) Truncated power corrections including condensates up to dimension 6 for N = 0 (see Sect.…”

$D^*Dρ$ and $B^*Bρ$ strong couplings in light-cone sum rules

“…The masses of quarks in MS scheme and the values of decay constants are listed in Table I, and values of the parameters in ρ DAs are listed in Table II, which are extracted from the method of QCDSR [9,28]. [34,35] and decay constants [9,[36][37][38], with the scale dependent quantity f T ρ given at µ 0 = 1.0 GeV.…”