The distribution of the fundamental constituents, the quarks and gluons, is expected to be different in pions, kaons, and nucleons. However, experimental data are sparse. As a result, there has been persistent doubt about the behaviour of the pion's valence quark structure function at large ...
In the SPS energy range it is conjectured [12] that the nuclear fireball undergoes a phase transition from bound hadronic matter to a deconfined quark–gluon plasma (QGP) state. This conjecture is supported by the observation that excitation functions of the K+/π+, Λ/π, and Ξ−/...
The kaon's glue and sea distributions are similar to those in the pion, although the inclusion of mass-dependent splitting functions introduces some differences on the valence-quark domain. This study should stimulate improved analyses of existing data and motivate new experiments sensitive to all $...
A rainbow-ladder truncation of QCD's Dyson-Schwinger equations, constrained by existing applications to hadron physics, is employed to compute the valence-quark parton distribution functions of the pion and kaon. Comparison is made to pi-N Drell-Yan data for the pion's u-quark distribution and...
In contrast with our previous analysis, where we only distinguished between valence-quark, sea-quark, and gluon fragmentation, we are now able to treat all partons independently and to properly incorporate the charm and bottom thresholds. Because of the sizable energy gap between PEP and LEP, ...
Quasi-distribution amplitudes for pion and kaon via the nonlocal chiral-quark model 来自 arXiv.org 喜欢 0 阅读量: 40 作者:Nam,Seung-il 摘要: We investigate the pseudoscalar (PS) meson (π and K) quasi-distribution amplitude (QDA), which is supposed to be an asymptotic analog to the ...
The studies of quark-antiquark-gluon hybrid mesons would improve our understanding of these exotic mesons. COMPASS may improve previous Primakoff polarizability and Hybrid studies by two to three orders of magnitude. Appendixes A (Pion and Kaon Polarizabilities at COMPASS) and B (Hybrid Meson ...
Pion-photon and kaon-photon transition distribution amplitudes in the Nambu–Jona-Lasinio model 2024, arXiv Quark stars in the pure pseudo-Wigner phase 2023, Research Square Parton distribution functions and QCD coupling constant from LHC and non-LHC data 2022, arXiv Generalized quasi-, Ioffe-tim...
A search for the exotic theta+ pentaquark in gamma d going to pion-pion-neutral kaon-antikaon The existence of exotic hadrons not allowed by a naive qqq and qq quark model would provide an opportunity to study the strong reaction in rare form. The pentaquark state named theta +, with ...
(uPDFs). In addition to purely gluonic terms the present approach includes also quark degrees of freedom. Phenomeno- logical fragmentation functions from the literature are used. The new mechanisms are responsible for π + - π − asymmetry. In contrast to standard collinear approach, applica- ...