Results 61 to 70 of about 27,535 (267)
Leading isospin-breaking effects on the lattice [PDF]
, 2017 Isospin is an almost exact symmetry of strong interactions and the corrections to the isosymmetric limit are, in general, at the percent level. For several hadronic quantities, such as pseudoscalar meson masses or the kaon leptonic and semileptonic decay
Giusti, D.
core +2 more sources
Study of b⟶c Induced B¯∗⟶Vℓν¯ℓ Decays
Advances in High Energy Physics, Volume 2020, Issue 1, 2020., 2020 In this paper, we investigate the tree‐dominated B¯u,d,s,c∗⟶Vℓ−ν¯ℓ (V=Du,d∗,Ds∗,J/ψ and ℓ = e, μ, τ) decays in the Standard Model with the relevant form factors obtained in the light‐front quark model. These decays involve much more helicity states relative to the corresponding B¯∗⟶Pℓ−ν¯ℓ and B¯⟶Vℓ−ν¯ℓ decays, and moreover, the contribution of ...
Qin Chang +4 more
wiley +1 more source
Pseudoscalar mesons and mixing models [PDF]
Zeitschrift f�r Physik C Particles and Fields, 1981 We take the charmonium state at 2.98 GeV to be the ηc and show that it can be included in quadratic and linear mass matrix mixing models, and also in those having radial excited states, in a way consistent with perturbative QCD. The effect on the models of the Crystal Ball measurement of BR (ι→γη′)/BR(ι→γη) is studied and the ratio is found to depend ...
A. B. Rimmer, F.D. Gault
openaire +2 more sources
Heavy-quark spin symmetry breaking in the Born-Oppenheimer approximation
Journal of High Energy Physics, 2023 Heavy-quark spin symmetry is explicitly broken by the mass splitting between a heavy-light pseudoscalar meson and its vector partner. This fact plays a pivotal role in the physics of states whose mass lies close to the threshold of an open-flavor meson ...
R. Bruschini
doaj +1 more source
B-meson decay constants: a more complete picture from full lattice QCD [PDF]
, 2015 We extend the picture of $B$-meson decay constants obtained in lattice QCD beyond those of the $B$, $B_s$ and $B_c$ to give the first full lattice QCD results for the $B^*$, $B^*_s$ and $B^*_c$.
A. T. Lytle +7 more
core +2 more sources
Effects of light-by-light scattering in the Lamb shift and hyperfine structure of muonic hydrogen [PDF]
EPJ Web of Conferences, 2019 We calculate the meson exchange contribution to the interaction operator of muon and proton, which is determined by the meson coupling with two photon state.
Dorokhov A. E. +3 more
doaj +1 more source
Heavy Meson Masses in the \epsilon-Regime of HM\chi PT
, 2011 The pseudoscalar and vector heavy meson masses are calculated in the \epsilon-regime of Heavy Meson Chiral Perturbation Theory to order \epsilon^4. The results of this calculation will allow the determination of low-energy coefficients (LECs) directly ...
C. G. Boyd, L. Liu, Raúl A. Briceño
core +1 more source
Pseudoscalar and vector meson form factors from lattice QCD [PDF]
, 2007 We present a study of the pseudoscalar and vector meson form factors, calculated using the Fat-Link Irrelevant Clover (FLIC) action in the framework of Quenched Lattice QCD.
A. G. Williams +9 more
core +2 more sources
Amplitude ambiguities in pseudoscalar meson photoproduction [PDF]
Physical Review C, 1996 7 ...
Greg Keaton, Ron L. Workman
openaire +4 more sources
A tmQCD mixed-action approach to flavour physics
EPJ Web of Conferences, 2018 We discuss a mixed-action approach in which sea quarks are regularised using non-perturbatively O(a) improved Wilson fermions, while a fully-twisted tmQCD action is used for valence quarks.
Herdoíza Gregorio +4 more
doaj +1 more source