Results 51 to 60 of about 84,997 (274)
First direct lattice-QCD calculation of the x -dependence of the pion parton distribution function [PDF]
Physical Review D, 2018 We present the first direct lattice-QCD calculation of the Bjorken-$x$ dependence of the valence quark distribution in the pion. Using large-momentum effective theory (LaMET), we calculate the boosted pion state with long Wilson link operators.
Jian-Hui Zhang +5 more
semanticscholar +1 more source
Pion wave-function as a bound system in 3 + 1 dimensional QCD
Results in Physics, 2017 We investigate the Bethe-Salpeter-like amplitude in 3 + 1 dimensions. This involves a system comprising a quark and an antiquark combined by gauge fields to satisfy gauge invariance. We derive the equation of motion for this system and construct a series
Teruo Kurai
doaj +1 more source
Pion distribution amplitude from Euclidean correlation functions: Exploring universality and higher-twist effects [PDF]
Physical Review D, 2018 Building upon our recent study [G. S. Bali et al., Eur. Phys. J. C 78, 217 (2018)], we investigate the feasibility of calculating the pion distribution amplitude from suitably chosen Euclidean correlation functions at large momentum.
G. Bali +9 more
semanticscholar +1 more source
THEORETICAL ASPECTS OF THE PION-PION INTERACTION [PDF]
International Journal of Modern Physics A, 2006 We give a brief review of the theoretical description of low energy pion-pion scattering by the combined use of Chiral Perturbation Theory and Roy equations, an update of the Regge parametrization of ππ cross sections at high energies, and a short discussion of the scalar radius of the pion.
Irinel Caprini +2 more
openaire +3 more sources
The investigation of K+π−, π+K− and π+π− atoms
EPJ Web of Conferences, 2016 Theory, using Low Energy QCD, predicts with high precision the pion-pion and pion-kaon scattering lengths. There is accurate relation between K+π− and π+K− atoms lifetime and pion-kaon S-wave scattering lengths with isospin 1/2 and 3/2.
Yazkov Valeriy
doaj +1 more source
Constraining axionlike particles from rare pion decays [PDF]
Physical Review D, 2019 Ultraviolet completions for axion-like particles (ALPs) lighter than the neutral pion generically induce ALP-neutral pion mixing, and are therefore sensitive to direct constraints on the mixing angle.
W. Altmannshofer, S. Gori, D. Robinson
semanticscholar +1 more source
QCD phase diagram in a magnetic background for different values of the pion mass [PDF]
Physical Review D, 2018 We investigate the behavior of the pseudocritical temperature of Nf=2+1 QCD as a function of a static magnetic background field for different values of the pion mass, going up to mπ≃660 MeV.
M. D’Elia +3 more
semanticscholar +1 more source
Pion-pion scattering at low energy [PDF]
Nuclear Physics B, 1997 We present technical details of the evaluation of the elastic pi-pi scattering amplitude to two loops in chiral perturbation theory. In particular, we elaborate on the renormalization procedure at the two-loop order and on the evaluation of the relevant Feynman diagrams that can all be expressed in terms of elementary functions. For the sake of clarity,
G. Ecker +4 more
openaire +4 more sources
Large-mass regime of the dilaton-pion low-energy effective theory [PDF]
Physical Review D, 2018 Numerical data of the SU(3) gauge theory with $N_f=8$ fermions in the fundamental representation suggest the existence of a large-mass regime, where the fermion mass is not small relative to the confinement scale, but nevertheless the dilaton-pion low ...
M. Golterman, Y. Shamir
semanticscholar +1 more source
Nature, 1976 Pion-Pion Interactions in Particle Physics. By B. R. Martin, D. Morgan and G. Shaw. Pp. xi+460. (Academic: London and New York, May 1976.) £16; $40.50.
openaire +2 more sources