Results 41 to 50 of about 233,246 (223)
Astronomische Nachrichten, EarlyView.ABSTRACT The physics of heavy‐ion collisions is one of the most exciting and challenging directions of science for the last four decades. On the theoretical side one deals with a non‐abelian field theory, while on the experimental side today's largest accelerators are needed to enable these studies.
Marcus Bleicher, Elena Bratkovskaya
wiley +1 more source
Two-pion bound state in sigma channel at finite temperature
, 2004 We study how we can understand the change of the spectral function and the pole location of the correlation function for sigma at finite temperature, which were previously obtained in the linear sigma model with a resummation technique called optimized ...
Munehisa Ohtani +4 more
core +1 more source
Berichte zur Wissenschaftsgeschichte, EarlyView.Abstract Short‐lived, unobservable, and not subject to the usual rules of conservation of energy and momentum, virtual particles—an integral part of the conceptual framework of quantum field theory (QFT)—exhibit a number of curious characteristics which, in recent decades, have in part fueled important discussions about their ontological status ...
Jean‐Philippe Martinez
wiley +1 more source
Meson-baryon sigma terms in QCD Sum Rules
, 2007 We evaluate the pion-nucleon and the pion-Delta sigma terms by employing the method of quantum chromodynamics (QCD) sum rules. The obtained value of the pion-nucleon sigma term is compatible with the larger values already anticipated by the recent ...
Belyaev +45 more
core +1 more source
Chiral Symmetry Restoration and Pion Interaction in Nuclear Matter [PDF]
, 1998 This paper is devoted to the interplay between p-wave, s-wave pion-nucleon/ nucleus interaction and in-medium pion-pion interaction with special emphasis on the role of the nuclear pionic scalar density driving a large amount of chiral symmetry ...
Chanfray, Guy, Davesne, Dany
core +3 more sources
Medical Physics, EarlyView.Abstract Background Geant4, a Monte Carlo Simulation Toolkit extensively used in bio‐medical physics, is in continuous evolution to include newest research findings to improve its accuracy and to respond to the evolving needs of a very diverse user community.
Pedro Arce +57 more
wiley +1 more source
Quark structure of the pion and pion form factor [PDF]
Phys.Rev. D52 (1995) 5295-5307, 1995 We consider the pion structure in the region of low and moderately high momentum transfers: at low $Q^2$, the pion is treated as a composite system of constituent quarks; at moderately high momentum transfers, $Q^2=10\div25\;GeV^2$, the pion \ff is calculated within perturbative QCD taking into account one--gluon hard exchange.
arxiv +1 more source
Decay Widths of X(1835) as Nucleon-Antinucleon Bound State
, 2012 Partial decay widths of various decay channels of the X(1835) are evaluated in the 3P0 quark model, assuming that the X(1835) is a nucleon-antinucleon bound state.
Faessler, Amand +3 more
core +1 more source
Meson-meson scattering lengths at maximum isospin from lattice QCD
, 2021 We summarize our lattice QCD determinations of the pion-pion, pion-kaon and kaon-kaon s-wave scattering lengths at maximal isospin with a particular focus on the extrapolation to the physical point and the usage of next-to-leading order chiral ...
Helmes, Christopher +7 more
core +1 more source
A comparative analysis of GEANT4, MCNP6 and FLUKA on proton‐induced gamma‐ray simulation
Medical Physics, EarlyView.Abstract BackgroundPrecise range verification is essential in proton therapy to minimize treatment margins due to the steep dose fall‐off of proton beams. The emission of secondary radiation from nuclear reactions between incident particles and tissues stands out as a promising method for range verification.
Hugo Freitas +3 more
wiley +1 more source