Results 111 to 120 of about 15,261 (206)

NONEQUILIBRIUM CHIRAL DYNAMICS AND EFFECTIVE LAGRANGIANS [PDF]

Non-Perturbative QCD, 2002
Talk given at the Sixth Workshop on Non-Perturbative Quantum Chromodynamics, Paris, 5-9 June 2001 (to appear in the Proceedings).
openaire   +2 more sources

Reconciling threshold and subthreshold expansions for pion–nucleon scattering

Physics Letters B, 2017
Heavy-baryon chiral perturbation theory (ChPT) at one loop fails in relating the pion–nucleon amplitude in the physical region and for subthreshold kinematics due to loop effects enhanced by large low-energy constants.
D. Siemens, J. Ruiz de Elvira, E. Epelbaum, M. Hoferichter, H. Krebs, B. Kubis, U.-G. Meißner   +6 more
doaj   +1 more source

A new theory framework for the electroweak radiative corrections in K l3 decays

Journal of High Energy Physics, 2020
We propose a new theory framework to study the electroweak radiative corrections in K l3 decays by combining the classic current algebra approach with the modern effective field theory. Under this framework, the most important O $$ \mathcal{O} $$ (G F α)
Chien-Yeah Seng, Daniel Galviz, Ulf-G. Meißner   +2 more
doaj   +1 more source

The pseudo-Goldstone spectrum of 2-colour QCD at finite density

, 2003
We examine the spectrum of 2-colour lattice QCD with 4 continuum flavours at a finite chemical potential ($\mu$) for quark-number, on a $12^3 \times 24$ lattice.
A. Nakamura, B. Vanderheyden, B.C. Barrois, C.R. Allton, D. Bailin, D. K. Sinclair, D. Toublan, D.T. Son, D.T. Son, J. B. Kogut, J. Gasser, J.B. Kogut, J.B. Kogut, J.B. Kogut, J.B. Kogut, J.B. Kogut, J.B. Kogut, J.B. Kogut, K. Splittorff, K. Splittorff, K. Splittorff,, M. Alford, P. de Forcrand, P.R. Crompton, P.R. Crompton, R. Aloisio, R. Aloisio, R. Rapp, S. Choe, S. Hands, S. Hands, Z. Fodor, Z. Fodor   +32 more
core   +1 more source

Remarks on the pion–nucleon σ-term

Physics Letters B, 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 point have
Martin Hoferichter, Jacobo Ruiz de Elvira, Bastian Kubis, Ulf-G. Meißner   +3 more
doaj   +1 more source

Mesonic low-energy constants

, 2014
We review the status of the coupling constants of chiral Lagrangians in the meson sector, the so-called low-energy constants (LECs). Special emphasis is put on the chiral $SU(2)$ and $SU(3)$ Lagrangians for the strong interactions of light mesons.
Bijnens, Johan, Ecker, Gerhard
core   +1 more source

Vector two-point functions in finite volume using partially quenched chiral perturbation theory at two loops

Journal of High Energy Physics, 2017
We calculate vector-vector correlation functions at two loops using partially quenched chiral perturbation theory including finite volume effects and twisted boundary conditions.
Johan Bijnens, Johan Relefors
doaj   +1 more source

Hadronic light-by-light contribution to aμ: extended Nambu-Jona-Lasinio, chiral quark models and chiral Lagrangians

EPJ Web of Conferences, 2016
This talk discusses our old work on the hadronic light-by-light contribution to the muon anomalous magnetic moment and some more recent contributions. I discuss the various contributions starting with pseudoscalar meson exchange, the quark- and pion-loop,
Bijnens Johan
doaj   +1 more source

Off-shell effects in dilepton production from hot interacting mesons

, 1997
The production of dielectrons in reactions involving a_1 mesons and pions is studied. We compare results obtained with different phenomenological Lagrangians that have been used in connection with hadronic matter and finite nuclei.
A. Drees, B. A. Li, C. Gale, C. Song, C. Song, C. Song, Charles Gale, G. Carter, G. Ecker, G. Janssen, G. Penso, G. Q. Li, H. B. O’Connell, H. Gomm, Hildegard Meyer-Ortmanns, J. K. Kim, James V. Steele, John W. Harris, K. Haglin, L. Xiong, N. M. Kroll, P. Ko, R. M. Barnett, R. Rapp, Song Gao, T. N. Pham, Z. Huang   +26 more
core   +1 more source

A proof of concept for matchete: an automated tool for matching effective theories. [PDF]

Eur Phys J C Part Fields, 2023
Fuentes-Martín J, König M, Pagès J, Thomsen AE, Wilsch F.   +4 more
europepmc   +1 more source