Author: R. HorsleyPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Isospin Splittings of Meson and Baryon Masses from Three-flavor Lattice QCD + QED
Author: R. HorsleyBaryon Mass Splittings and Strong [math][mi Mathvariant
![Baryon Mass Splittings and Strong [math][mi Mathvariant PDF](https://books.google.com/books/content/images/frontcover/NnKgAQAACAAJ?fife=w80-h100)
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 29
Book Description
We study SU(3) flavor breaking corrections to the relation between the octet baryon masses and the nucleon-meson CP-violating interactions induced by the QCD theta term. We work within the framework of SU(3) chiral perturbation theory and work through next-to-next-to-leading order in the SU(3) chiral expansion, which is O(m_q^2). At lowest order, the CP-odd couplings induced by the QCD theta term are determined by mass splittings of the baryon octet, the classic result of Crewther et al. We show that for each isospin-invariant CP-violating nucleon-meson interaction there exists one relation which is respected by loop corrections up to the order we work, while other leading-order relations are violated. With these relations we extract a precise value of the pion-nucleon coupling g_0 by using recent lattice QCD evaluations of the proton-neutron mass splitting. In addition, we derive semi-precise values for CP-violating coupling constants between heavier mesons and nucleons and discuss their phenomenological impact on electric dipole moments of nucleons and nuclei.
Meson-Baryon Scattering Lengths from Mixed-Action Lattice QCD.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 27
Book Description
The??+,?+?°, K+p, K+n, {bar K}°?+, and {bar K}°?° 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{sub {pi}+?+} = -0.197 ± 0.017 fm, and a{sub {pi}+?°} = -0.098 ± 0.017 fm, where the comprehensive error includes statistical and systematic uncertainties.
Gribov-90 Memorial Volume: Field Theory, Symmetry, And Related Topics - Proceedings Of The Memorial Workshop Devoted To The 90th Birthday Of V N Gribov
Author: Yuri L DokshitzerPublisher: World Scientific
ISBN: 9811238413
Category : Science
Languages : en
Pages : 528
Book Description
Vladimir Naumovich Gribov is one of the creators of modern theoretical physics. The concepts and methods that Gribov has developed in the second half of the 20th century became cornerstones of the physics of high energy hadron interactions (relativistic theory of complex angular momenta, a notion of the vacuum pole — Pomeron, effective reggeon field theory), condensed matter physics (critical phenomena), neutrino oscillations, and nuclear physics.His unmatched insights into the nature of the quantum field theory helped to elucidate, in particular, the origin of classical solutions (instantons), quantum anomalies, specific problems in quantization of non-Abelian fields (Gribov anomalies, Gribov horizon), and the role of light quarks in the color confinement phenomenon.The Memorial Workshop devoted to Gribov's 90th birthday was cancelled due to the coronavirus pandemic in 2020; however, this did not deter the collection of many new studies in challenging theoretical physics problems across a broad variety of topics, and shared memories about their colleague, great teacher and friend. The contributions of this memorial volume affirms the everlasting impact of Gribov's scientific heritage upon the physics of the 21st century.
Strangeness and Charge Symmetry Violation in Nucleon Structure
Author: Phiala Elisabeth ShanahanPublisher: Springer
ISBN: 3319314386
Category : Science
Languages : en
Pages : 224
Book Description
This thesis discusses two key topics: strangeness and charge symmetry violation (CSV) in the nucleon. It also provides a pedagogical introduction to chiral effective field theory tailored to the high-precision era of lattice quantum chromodynamics (QCD). Because the nucleon has zero net strangeness, strange observables give tremendous insight into the nature of the vacuum; they can only arise through quantum fluctuations in which strange–antistrange quark pairs are generated. As a result, the precise values of these quantities within QCD are important in physics arenas as diverse as precision tests of QCD, searches for physics beyond the Standard Model, and the interpretation of dark matter direct-detection experiments. Similarly, the precise knowledge of CSV observables has, with increasing experimental precision, become essential to the interpretation of many searches for physics beyond the Standard Model. In this thesis, the numerical lattice gauge theory approach to QCD is combined with the chiral perturbation theory formalism to determine strange and CSV quantities in a diverse range of observables including the octet baryon masses, sigma terms, electromagnetic form factors, and parton distribution functions. This thesis builds a comprehensive and coherent picture of the current status of understanding of strangeness and charge symmetry violation in the nucleon.
Mass of the B(c) Meson in Three-flavor Lattice QCD.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 4
Book Description
The authors use lattice QCD to predict the mass of the B{sub c} meson. They use the MILC Collaborations publicly available ensembles of lattice gauge fields, which have a quark sea with two flavors (up and down) much lighter than a third (strange). The final result is m{sub B{sub c}} = 6304 ± 120{sup +18} MeV. The first error bar is a sum in quadrature of statistical and systematic uncertainties, and the second is an estimate of heavy-quark discretization effects.
Particle Physics Reference Library
Author: Herwig SchopperPublisher: Springer Nature
ISBN: 3030382079
Category : Heavy ions
Languages : en
Pages : 632
Book Description
This first open access volume of the handbook series contains articles on the standard model of particle physics, both from the theoretical and experimental perspective. It also covers related topics, such as heavy-ion physics, neutrino physics and searches for new physics beyond the standard model. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access
Isospin Splittings in the Decuplet Baryon Spectrum from Dynamical QCD+QED
Author: Mass Splittings in the Baryon Octet and the Nucleon [omikron]-term in Lattice QCD
![Mass Splittings in the Baryon Octet and the Nucleon [omikron]-term in Lattice QCD PDF](https://books.google.com/books/content/images/frontcover/ptXAPgAACAAJ?fife=w80-h100)
Author: S. GüskenHigh Energy Physics Index
Author: Publisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 606
Book Description