Search results for "Effective lagrangian"

showing 2 items of 42 documents

Charge fluctuations and electric mass in a hot meson gas

2006

Net-Charge fluctuations in a hadron gas are studied using an effective hadronic interaction. The emphasis of this work is to investigate the corrections of hadronic interactions to the charge fluctuations of a non-interacting resonance gas. Several methods, such as loop, density and virial expansions are employed. The calculations are also extended to SU(3) and some resummation schemes are considered. Although the various corrections are sizable individually, they cancel to a large extent. As a consequence we find that charge fluctuations are rather well described by the free resonance gas.

gas [meson]Nuclear and High Energy PhysicsNuclear TheoryMesonresonance [gas]HadronFOS: Physical sciencesElectric chargeResonance (particle physics)fluctuation [charge]susceptibilityVirial theoremNuclear Theory (nucl-th)Nuclear physicsmass [rho(770)]electric [mass]unitarityddc:530Resummationnumerical calculationsinteraction [pi pi]Physicshigher-order [correction]effective Lagrangianvirial [expansion]High Energy Physics::PhenomenologySU(3) [symmetry]Charge (physics)relativistic [expansion]quantum [statistics]Quantum electrodynamicsQuark–gluon plasmaPhysical Review C
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Role of the N-*(1535) in the J/psi -> pp and J/psi -> p(+)Lambda reactions

2009

We study the J/psi -> p eta p and J/psi -> pK(+)Lambda reactions with a unitary chiral approach. We find that the unitary chiral approach, which generates the N-*(1535) dynamically, can describe the data reasonably well, particularly the ratio of the integrated cross sections. This study provides further support for the unitary chiral description of the N-*(1535). We also discuss some subtle differences between the coupling constants determined from the unitary chiral approach and those determined from phenomenological studies

ratio [width]High Energy Physics::LatticeJ/psi(3100) --> p anti-p etaJ/psi(3100) --> Lambda anti-p K+Físicahadronic decay [J/psi(3100)]coupling constant [N(1535)]mass spectrumwidth [J/psi(3100)]unitarityddc:530chiral [effective Lagrangian]numerical calculations
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