Results 1 to 10 of about 348 (137)

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, Pena Carlos, Preti David, Romero José Ángel, Ugarrio Javier   +4 more
doaj   +1 more source

Mass Spectrum of Noncharmed and Charmed Meson States in Extended Linear-Sigma Model

Particles
The mass spectrum of different meson particles is generated using an effective Lagrangian of the extended linear-sigma model (eLSM) for scalar and pseudoscalar meson fields and quark flavors, up, down, strange, and charm.
Azar I. Ahmadov, Azzah A. Alshehri, Abdel Nasser Tawfik   +2 more
doaj   +1 more source

Meson electromagnetic form factors

EPJ Web of Conferences, 2012
The electromagnetic structure of the pseudoscalar meson nonet is completely described by the sophisticated Unitary&Analytic model, respecting all known theoretical properties of the corresponding form factors.
Dubničková Anna Z., Dubnička Stanislav   +1 more
doaj   +1 more source

Model discrimination in pseudoscalar-meson photoproduction

Physics Letters B, 2016
To learn about a physical system of interest, experimental results must be able to discriminate among models. We introduce a geometrical measure to quantify the distance between models for pseudoscalar-meson photoproduction in amplitude space ...
J. Nys, J. Ryckebusch, D.G. Ireland, D.I. Glazier   +3 more
doaj   +1 more source

Probing the transversity spin structure of a nucleon in neutrino-production of a charmed meson

EPJ Web of Conferences, 2016
Including O(mc) terms in the coefficient functions and/or O(mD) twist 3 contributions in the heavy meson distribution amplitudes leads to a non-zero transverse amplitude for exclusive neutrino production of a D pseudoscalar charmed meson on an ...
Pire B., Szymanowski L., Wagner J.
doaj   +1 more source

Relativistic corrections to the pair Bc-meson production in e+e− annihilation

Nuclear Physics B, 2016
Relativistic corrections to the pair Bc-meson production in e+e−-annihilation are calculated. We investigate a production of pair pseudoscalar, vector and pseudoscalar+vector Bc-mesons in the leading order perturbative quantum chromodynamics and ...
A.A. Karyasov, A.P. Martynenko, F.A. Martynenko   +2 more
doaj   +1 more source

The glueball content of ηc

Physics Letters B, 2022
We carry out the first lattice QCD derivation of the mixing energy and the mixing angle of the pseudoscalar charmonium and glueball on two gauge ensembles with Nf=2 degenerate dynamical charm quarks. The mixing energy is determined to be 49(6) MeV on the
Renqiang Zhang, Wei Sun, Ying Chen, Ming Gong, Long-Cheng Gui, Zhaofeng Liu   +5 more
doaj   +1 more source

Gamma-gamma physics and meson transition form factors [PDF]

EPJ Web of Conferences, 2020
I summarize recent experimental results for two photon production of mesons. These processes include the neutral pion, η and η′ transition form factors and two photon production of pseudoscalar meson pairs.
Kupsc Andrzej
doaj   +1 more source

Covariant Spectator Theory of heavy–light and heavy mesons and the predictive power of covariant interaction kernels

Physics Letters B, 2017
The Covariant Spectator Theory (CST) is used to calculate the mass spectrum and vertex functions of heavy–light and heavy mesons in Minkowski space. The covariant kernel contains Lorentz scalar, pseudoscalar, and vector contributions.
Sofia Leitão, Alfred Stadler, M.T. Peña, Elmar P. Biernat   +3 more
doaj   +1 more source

Exploring solutions to the muon g-2 anomaly in a 3-3-1 model under flavor constraints

European Physical Journal C: Particles and Fields
The magnetic moment of the muon can receive significant two-loop contributions from a light pseudoscalar. Notably, the spectrum of scalars of 3-3-1 models includes one pseudoscalar.
A. Doff, João Paulo Pinheiro, C. A. de S. Pires   +2 more
doaj   +1 more source