Results 21 to 30 of about 344 (138)
European Physical Journal C: Particles and Fields, 2023 We calculate the complete T matrices of the elastic light pseudoscalar meson and heavy meson scattering to the third order in heavy meson chiral perturbation theory. We determine the low-energy constants by fitting the phase shifts and scattering lengths
Bo-Lin Huang +3 more
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The role of meson exchanges in light-by-light scattering
Physics Letters B, 2017 We discuss the role of meson exchange mechanisms in γγ→γγ scattering. Several pseudoscalar (π0, η, η′(958), ηc(1S), ηc(2S)), scalar (f0(500), f0(980), a0(980), f0(1370), χc0(1P)) and tensor (f2(1270), a2(1320), f2′(1525), f2(1565), a2(1700)) mesons are ...
Piotr Lebiedowicz, Antoni Szczurek
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Decay of the pseudoscalar glueball into vector, axial-vector, scalar and pseudoscalar mesons
European Physical Journal C: Particles and Fields, 2023 We resume the investigation of the ground-state pseudoscalar glueball, $$J^{PC}=0^{-+}$$ J PC = 0 - + , by computing its two- and three-body decays into vector and axial-vector quark-antiquark meson fields additional to scalar and pseudoscalar mesons ...
Walaa I. Eshraim
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Spectra and decay rates of bb̄ meson using Gaussian wave function
EPJ Web of Conferences, 2015 Using the Gaussian wave function mass spectra and decay rates of bb̄ meson are investigated in the framework of phenomenological quark anti-quark potential (coulomb plus power) model consisting of relativistic corrections to the kinetic energy term.
Rai Ajay Kumar +2 more
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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
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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
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EPJ Web of Conferences, 2018 The firm understanding of standard quark-antiquark states (including excited states) is necessary to search for non-conventional mesons with the same quantum numbers.
Piotrowska M., Giacosa F.
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European Physical Journal C: Particles and Fields, 2019 We study the scattering of the light-flavor pseudoscalar mesons ($$\pi , K, \eta $$ π,K,η ) off the ground-state charmed mesons ($$D,D_s$$ D,Ds ) within chiral effective field theory.
Zhi-Hui Guo +4 more
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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
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Mass Spectrum of Noncharmed and Charmed Meson States in Extended Linear-Sigma Model
ParticlesThe 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 +2 more
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