Author: Pia Leonie Jones PetrakPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
On Baryon Sigma Terms from Lattice QCD with Wilson Quarks
Author: Pia Leonie Jones PetrakPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Octet Baryon Masses and Sigma Terms from an SU(3) Chiral Extrapolation
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We analyze the consequences of the remarkable new results for octet baryon masses calculated in 2+1- avour lattice QCD using a low-order expansion about the SU(3) chiral limit. We demonstrate that, even though the simulation results are clearly beyond the power-counting regime, the description of the lattice results by a low-order expansion can be significantly improved by allowing the regularisation scale of the effective field theory to be determined by the lattice data itself. The model dependence of our analysis is demonstrated to be small compared with the present statistical precision. In addition to the extrapolation of the absolute values of the baryon masses, this analysis provides a method to solve the difficult problem of fine-tuning the strange-quark mass. We also report a determination of the sigma terms for all of the octet baryons, including an accurate value of the pion-nucleon sigma term and the first determination of the strangeness sigma term based on 2+1-flavour l.
Scientific and Technical Aerospace Reports
Author: Numerical Challenges in Lattice Quantum Chromodynamics
Author: Andreas FrommerPublisher: Springer Science & Business Media
ISBN: 3642583334
Category : Mathematics
Languages : en
Pages : 197
Book Description
Lattice gauge theory is a fairly young research area in Theoretical Particle Physics. It is of great promise as it offers the framework for an ab-initio treatment of the nonperturbative features of strong interactions. Ever since its adolescence the simulation of quantum chromodynamics has attracted the interest of numerical analysts and there is growing interdisciplinary engage ment between theoretical physicists and applied mathematicians to meet the grand challenges of this approach. This volume contains contributions of the interdisciplinary workshop "Nu merical Challenges in Lattice Quantum Chromo dynamics" that the Institute of Applied Computer Science (IAI) at Wuppertal University together with the Von-Neumann-Institute-for-Computing (NIC) organized in August 1999. The purpose of the workshop was to offer a platform for the exchange of key ideas between lattice QCD and numerical analysis communities. In this spirit leading experts from both fields have put emphasis to transcend the barriers between the disciplines. The meetings was focused on the following numerical bottleneck problems: A standard topic from the infancy of lattice QCD is the computation of Green's functions, the inverse of the Dirac operator. One has to solve huge sparse linear systems in the limit of small quark masses, corresponding to high condition numbers of the Dirac matrix. Closely related is the determination of flavor-singlet observables which came into focus during the last years.
Baryon masses and σ-terms [sigma-terms] to second order in the quark masses
![Baryon masses and σ-terms [sigma-terms] to second order in the quark masses PDF](https://books.google.com/books/content/images/frontcover/0vTWzQEACAAJ?fife=w80-h100)
Author: Buḡra BorasoyModern Perspectives in Lattice QCD: Quantum Field Theory and High Performance Computing
Author: Laurent LellouchPublisher: Oxford University Press
ISBN: 0199691606
Category : Mathematics
Languages : en
Pages : 756
Book Description
The aim of the book is to familiarize the new generation of PhD students and postdoctoral fellows with the principles and methods of modern lattice field theory, which aims to resolve fundamental, non-perturbative questions about QCD without uncontrolled approximations.
Physics Briefs
Author: High Energy Physics Index
Author: Publisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 652
Book Description
Baryon masses and _s63-terms [sigma-terms] to second order in the quark masses
![Baryon masses and _s63-terms [sigma-terms] to second order in the quark masses PDF](https://books.google.com/books/content/images/frontcover/fuPEtwAACAAJ?fife=w80-h100)
Author: Buḡra BorasoyMeson-Baryon Scattering Lengths from Mixed-Action Lattice QCD.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The $\pi^+\Sigma^+$, $\pi^+\Xi^0$, $K^+p$, $K^+n$, and $K^0 \Xi^0$ scattering lengths are calculated in mixed-action Lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations at four light-quark masses, and at two light-quark masses on the fine MILC configurations. Heavy Baryon Chiral Perturbation Theory with two and three flavors of light quarks is used to perform the chiral extrapolations. We find no convergence for the kaon-baryon processes in the three-flavor chiral expansion. Using the two-flavor chiral expansion, we find $a_{\pi^+\Sigma^+} =?0.197 ± 0.017$ fm, and $a_{\pi^+\Xi^0} =?0.098 0.017$ fm, where the comprehensive error includes statistical and systematic uncertainties.