Zobrazeno 1 - 10
of 820
pro vyhledávání: '"Símula S"'
Publikováno v:
EPJ Web of Conferences, Vol 270, p 00015 (2022)
We present the results of the application of the Dispersion Matrix approach to exclusive semileptonic B-meson decays. This method allows to determine the hadronic form factors in a non-perturbative and completely modelindependent way. Starting from l
Externí odkaz:
https://doaj.org/article/5b7daa7d818b48b589ee592eb934ec5f
Publikováno v:
EPJ Web of Conferences, Vol 175, p 13026 (2018)
We present a lattice determination of the vector and scalar form factors of the D → π(K)lv semileptonic decays, which are relevant for the extraction of the CKM matrix elements |Vcd| and |Vcs| from experimental data. Our analysis is based on the g
Externí odkaz:
https://doaj.org/article/48edb6bd7a25430e91e06979ac6c9a4e
Publikováno v:
EPJ Web of Conferences, Vol 175, p 13028 (2018)
We present a new lattice determination of some of the parameters appearing both in the Operator Product Expansion (OPE) analysis of the inclusive semileptonic B-meson decays and in the Heavy Quark Expansion (HQE) of the pseudoscalar (PS) and vector (
Externí odkaz:
https://doaj.org/article/bf28d416a35440c6a5dfa2195cafcf50
Publikováno v:
EPJ Web of Conferences, Vol 175, p 13022 (2018)
We present a preliminary lattice calculation of the D → π and D → K tensor form factors fT (q2) as a function of the squared 4-momentum transfer q2. ETMC recently computed the vector and scalar form factors f+(q2) and f0(q2) describing D → π(
Externí odkaz:
https://doaj.org/article/fd62d197aae74032ac43f739befefdef
Publikováno v:
EPJ Web of Conferences, Vol 175, p 06006 (2018)
We present a lattice calculation of the Hadronic Vacuum Polarization (HVP) contribution of the strange and charm quarks to the anomalous magnetic moment of the muon including leading-order electromagnetic (e.m.) corrections. We employ the gauge confi
Externí odkaz:
https://doaj.org/article/fdf2ba839325450387965fcee91ffd74
Publikováno v:
EPJ Web of Conferences, Vol 192, p 00041 (2018)
Applying the QCD sum-rule machinery in the so-called local-duality shape to heavy-light mesons reveals that, as a consequence of the non-zero mass gap between up and down quarks, the leptonic decay constants of the neutral and charged versions of the
Externí odkaz:
https://doaj.org/article/dba84fa19eba49f48b921fb4d4753b70
Autor:
Giusti Davide, Lubicz Vittorio, Martinelli Guido, Sanfilippo Francesco, Simula Silvano, Tantalo Nazario, Tarantino Cecilia
Publikováno v:
EPJ Web of Conferences, Vol 175, p 06002 (2018)
We present a study of the isospin-breaking (IB) corrections to pseudoscalar (PS) meson masses using the gauge configurations produced by the ETM Collaboration with Nf = 2+1+1 dynamical quarks at three lattice spacings varying from 0.089 to 0.062 fm.
Externí odkaz:
https://doaj.org/article/d1cb055195a54a2b9f87ff829887da95
Publikováno v:
EPJ Web of Conferences, Vol 137, p 06017 (2017)
Compared with lattice QCD, isospin breaking of heavy-meson decay constants from QCD sum rules agrees for D mesons but disagrees (by a factor of four) for B mesons.
Externí odkaz:
https://doaj.org/article/970fed63c1f848ad8098d09f97e3c61c
Publikováno v:
EPJ Web of Conferences, Vol 137, p 13010 (2017)
We determine the strong couplings of three mesons that involve, at least, one ηc or J/ψ meson, within the framework of a constituent-quark model by means of relativistic dispersion formulations. For strong couplings of J/ψ mesons to two charmed me
Externí odkaz:
https://doaj.org/article/9e6e2beeb39f461ca49eab4e119efd38
Publikováno v:
EPJ Web of Conferences, Vol 129, p 00025 (2016)
Revisiting the strong couplings of three mesons, each of which involves at least one charm quark, proves clear disaccord between quark-model and QCD sum-rule results.
Externí odkaz:
https://doaj.org/article/cce9545e21d442dea63724f3864a40f4