0000000000068833

AUTHOR

Y. ÜNal

showing 4 related works from this author

Mass and width of the Delta resonance using complex-mass renormalization

2016

The pole mass and width of the Delta resonance are calculated in the relativistic chiral effective field theory approach. We choose a systematic power-counting procedure by applying the complex-mass scheme (CMS).

DeltaPhysicsRenormalization010308 nuclear & particles physicsPhysicsQC1-999Quantum electrodynamics0103 physical sciencesEffective lagrangianEffective field theory010306 general physics01 natural sciencesResonance (particle physics)EPJ Web of Conferences
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Mass and width of theΔ(1232)resonance using complex-mass renormalization

2016

We discuss the pole mass and the width of the $\Delta(1232)$ resonance to third order in chiral effective field theory. In our calculation we choose the complex-mass renormalization scheme (CMS) and show that the CMS provides a consistent power-counting scheme. In terms of the pion-mass dependence, we compare the convergence behavior of the CMS with the small-scale expansion (SSE).

PhysicsParticle physicsNuclear TheoryPhysics::Instrumentation and Detectors010308 nuclear & particles physicsFeynman graph01 natural sciencesResonance (particle physics)RenormalizationHigh Energy Physics - PhenomenologyThird orderHigh Energy Physics - LatticeQuantum electrodynamics0103 physical sciencesConvergence (routing)Effective field theory010306 general physicsNuclear theoryPhysical Review C
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Interaction Of The Vector-Meson Octet With The Baryon Octet In Effective Field Theory

2015

We analyze the constraint structure of the interaction of vector mesons with baryons using the classical Dirac constraint analysis. We show that the standard interaction in terms of two independent SU(3) structures is consistent at the classical level. We then require the self-consistency condition of the interacting system in terms of perturbative renormalizability to obtain relations for the renormalized coupling constants at the one-loop level. As a result we find a universal interaction with one coupling constant which is the same as in the massive Yang-Mills Lagrangian of the vector-meson sector.

PhysicsCoupling constantNuclear and High Energy PhysicsParticle physicsMesonOctetNuclear TheoryHigh Energy Physics::LatticeDirac (software)High Energy Physics::PhenomenologyFOS: Physical sciencesVector meson dominanceNuclear Theory (nucl-th)BaryonRenormalizationHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Vector meson
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Contribution of the $a_1$ meson to the axial nucleon-to-$\Delta$ transition form factors

2018

We analyze the low-$Q^2$ behavior of the axial form factor $G_A(Q^2)$, the induced pseudoscalar form factor $G_P(Q^2)$, and the axial nucleon-to-$\Delta$ transition form factors $C^A_5(Q^2)$ and $C^A_6(Q^2)$. Building on the results of chiral perturbation theory, we first discuss $G_A(Q^2)$ in a chiral effective-Lagrangian model including the $a_1$ meson and determine the relevant coupling parameters from a fit to experimental data. With this information, the form factor $G_P(Q^2)$ can be predicted. For the determination of the transition form factor $C^A_5(Q^2)$ we make use of an SU(6) spin-flavor quark-model relation to fix two coupling constants such that only one free parameter is left.…

Coupling constantPhysicsChiral perturbation theoryMesonNuclear Theory010308 nuclear & particles physicsHigh Energy Physics::LatticeNuclear TheoryHigh Energy Physics::PhenomenologyForm factor (quantum field theory)Coupling (probability)01 natural sciencesHigh Energy Physics - ExperimentPseudoscalarHigh Energy Physics - Phenomenology0103 physical sciencesSU(6)010306 general physicsNucleonNuclear ExperimentMathematical physics
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