Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Jacobo Ruiz de Elvira"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 9, Pp 1-3 (2024)
Externí odkaz:
https://doaj.org/article/b766bd011a0744a2a179cff6d8070de2
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 4, Pp 1-40 (2024)
Abstract We present a comprehensive calculation of the K L → γ ∗ γ ∗ form factor in dispersion theory, using input from the leptonic decays K L → ℓ + ℓ − γ, $${K}_{L}\to {{\ell}}_{1}^{+}{{\ell}}_{1}^{-}{{\ell}}_{2}^{+}{{\ell}}_{2}^{-
Externí odkaz:
https://doaj.org/article/c252f6cac4134086b7c8fd3a13c01a49
Publikováno v:
Physics Letters B, Vol 853, Iss , Pp 138698- (2024)
A reliable determination of the pole parameters and residues of nucleon resonances is notoriously challenging, given the required analytic continuation into the complex plane. We provide a comprehensive analysis of such resonance parameters accessibl
Externí odkaz:
https://doaj.org/article/7d5b0af53299465f9d31ed6f380f44b5
Publikováno v:
Physics Letters B, Vol 843, Iss , Pp 138001- (2023)
In recent years, a persistent tension between phenomenological and lattice QCD determinations of the pion–nucleon σ-term σπN has developed. In particular, lattice-QCD calculations have matured to the point that isospin-violating effects need to
Externí odkaz:
https://doaj.org/article/58d5ef4e33ed4f76b668129c30af67aa
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 8, Pp 1-18 (2022)
Abstract We present a calculation of the C-odd radiative corrections to e + e − → π + π − in a dispersive formalism, concentrating on the leading pion-pole contribution in the virtual box diagrams. In particular, we show how the effect of a g
Externí odkaz:
https://doaj.org/article/812c5280101e4eaea710965d4f8f3d2c
Publikováno v:
Physics Letters B, Vol 825, Iss , Pp 136852- (2022)
We study the pion-mass dependence of the two-pion channel in the hadronic-vacuum-polarization (HVP) contribution to the anomalous magnetic moment of the muon aμHVP, by using an Omnès representation for the pion vector form factor with the phase shi
Externí odkaz:
https://doaj.org/article/0d46f4e36d3f4d439bc71f32c0403802
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 11, Pp 1-30 (2018)
Abstract We carry out an analysis of $$\pi \pi $$ ππ scattering in the $$IJ=00$$ IJ=00 , 11 and 20 channels in configuration space up to a maximal center-of-mass energy $$\sqrt{s}=1.4$$ s=1.4 GeV. We separate the interaction into two regions marked
Externí odkaz:
https://doaj.org/article/b47bb9129d9d45b1bd1de074f3bd57c3
Publikováno v:
Physics Letters B, Vol 760, Iss C, Pp 74-78 (2016)
The pion–nucleon σ-term can be stringently constrained by the combination of analyticity, unitarity, and crossing symmetry with phenomenological information on the pion–nucleon scattering lengths. Recently, lattice calculations at the physical p
Externí odkaz:
https://doaj.org/article/1b9025e6b3b449dd81ad7281ee429ab6
We discuss recent results regarding the interplay between chiral and $U(1)_A$ symmetry restoration, both from the point of view of Ward Identities relating meson susceptibilities and quark condensates, and from the behaviour of light meson resonances
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::353e0501b51a7110bba6cb62f2ad1836
http://arxiv.org/abs/2111.14440
http://arxiv.org/abs/2111.14440
Publikováno v:
E-Prints Complutense. Archivo Institucional de la UCM
Instituto de Salud Carlos III (ISCIII)
Instituto de Salud Carlos III (ISCIII)
For several decades, the $\sigma/f_0(500)$ and $\kappa/K_0^*(700)$ resonances have been subject to long-standing debate. Both their existence and properties were controversial until very recently. In this tutorial review we compare model-independent
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e365c9a545cc1ad85fb1fc1b938ff9e3
https://eprints.ucm.es/id/eprint/66728/
https://eprints.ucm.es/id/eprint/66728/