Distributed Parametric Optimization with the Geneva Library

Berlich, Rüdiger; Gabriel, Sven; García, Ariel Oscar; Kunze, M.

doi:10.1007/978-1-4419-8014-4_24

Cited by 12 publications

(19 citation statements)

References 1 publication

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“…This is linked to the case where one keeps the quark-mass dependence of M B and M R in (64). That asks for a further expansion of the system (66,67). In any conventional counting…”

Section: Convergence Studies For the Scalar Bubble-loop Functionmentioning

confidence: 99%

On the convergence of the chiral expansion for the baryon ground-state masses

2018

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We study the chiral expansion of the baryon octet and decuplet masses in the isospin limit. It is illustrated that a chiral expansion of the one-loop contributions is rapidly converging up to quark masses that generously encompasses the mass of the physical strange quark. We express the successive orders in terms of physical meson and baryon masses. In addition, owing to specific correlations amongst the chiral moments, we suggest a reordering of terms that make the convergence properties more manifest. Explicit expressions up to chiral order five are derived for all baryon masses at the one-loop level. The baryon masses obtained do not depend on the renormalization scale. Our scheme is tested against QCD lattice data, where the low-energy parameters are systematically correlated by large-N c sum rules. A reproduction of the baryon masses from PACS-CS, LHPC, HSC, NPLQCD, QCDSF-UKQCD and ETMC is achieved for ensembles with pion and kaon masses smaller than 600 MeV. Predictions for baryon masses on ensembles from CLS as well as all low-energy constants that enter the baryon masses at N 3 LO are made.

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“…This is linked to the case where one keeps the quark-mass dependence of M B and M R in (64). That asks for a further expansion of the system (66,67). In any conventional counting…”

Section: Convergence Studies For the Scalar Bubble-loop Functionmentioning

confidence: 99%

On the convergence of the chiral expansion for the baryon ground-state masses

2018

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“…For any set of the low-energy parameters ten coupled non-linear equations are to be solved on each lattice ensemble considered (see [4]). We apply the evolutionary algorithm of GENEVA 1.9.0-GSI [23] with runs of a population size 2500 on 500 parallel CPU cores.…”

Section: Charmed Baryon Masses From Qcd Lattice Simulationsmentioning

confidence: 99%

Low-energy constants from charmed baryons on QCD lattices

2020

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We study the light quark-mass dependence of charmed baryon masses as measured by various QCD lattice collaborations. A global fit to such data based on the chiral SU(3) Lagrangian is reported on. All low-energy constants that are relevant at next-to-next-to-next-to-leading order (N 3 LO) are determined from the lattice data sets where constraints from sum rules as they follow from large-N c QCD at subleading order are considered. The expected hierarchy for the low-energy constants in the 1/N c expansion is confirmed by our global fits to the lattice data. With our results the low-energy interaction of the Goldstone bosons with the charmed baryon ground states is well constrained and the path towards realistic coupled-channel computations in this sector of QCD is prepared.

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“…For any set of the low-energy parameters nine coupled non-linear equations are to be solved on each lattice ensemble considered. We apply the evolutionary algorithm of GENEVA 1.9.0-GSI [23] with runs of a population size 1500 on 300 parallel CPU cores.…”

Section: Global Fit To Meson Masses From Qcd Lattice Simulationsmentioning

confidence: 99%

On light vector mesons and chiral SU(3) extrapolations

Guo

Lutz

2019

Nuclear Physics A

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A chiral extrapolation of the light vector meson masses in the up, down and strange quark masses of QCD is presented. We apply an effective chiral Lagrangian based on the hadrogenesis conjecture to QCD lattice ensembles of PACS-CS, QCDSF-UKQCD and HSC in the strict isospin limit. The leading orders low-energy constants are determined upon a global fit to the lattice data set. We use the pion and kaon masses as well as the size of the finite volume as lattice ensemble parameters only. The quark mass ratio on the various ensembles are then predicted in terms of our set of low-energy constants. An accurate reproduction of the vector meson masses and quark-mass ratios as provided by the lattice collaborations and the Particle Data Group (PDG) is achieved. Particular attention is paid to the ω − φ mixing phenomenon, which is demonstrated to show a strong quark mass dependence.

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Distributed Parametric Optimization with the Geneva Library

Cited by 12 publications

References 1 publication

On the convergence of the chiral expansion for the baryon ground-state masses

On the convergence of the chiral expansion for the baryon ground-state masses

Low-energy constants from charmed baryons on QCD lattices

On light vector mesons and chiral SU(3) extrapolations

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