Strange quark contributions to nucleon mass and spin from lattice QCD

Abstract

Contributions of strange quarks to the mass and spin of the nucleon, characterized by the observables f_Ts and Delta s, respectively, are investigated within lattice QCD. The calculation employs a 2+1-flavor mixed-action lattice scheme, thus treating the strange quark degrees of freedom in dynamical fashion. Numerical results are obtained at three pion masses, m_pi = 495 MeV, 356 MeV, and 293 MeV, renormalized, and chirally extrapolated to the physical pion mass. The value extracted for Delta s at the physical pion mass in the MSbar scheme at a scale of 2 GeV is Delta s = -0.031(17), whereas the strange quark contribution to the nucleon mass amounts to f_Ts =0.046(11). In the employed mixed-action scheme, the nucleon valence quarks as well as the strange quarks entering the nucleon matrix elements which determine f_Ts and Delta s are realized as domain wall fermions, propagators of which are evaluated in MILC 2+1-flavor dynamical asqtad quark ensembles. The use of domain wall fermions leads to mild renormalization behavior which proves especially advantageous in the extraction of f_Ts.

29 pages, 5 figures; version accepted by journal. Minute reformulations, typos fixed

References in corpus (11)

• Hadronic Uncertainties in the Elastic Scattering of Supersymmetric Dark Matter
• Continuum Limit Physics from 2+1 Flavor Domain Wall QCD
• Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea
• Nucleon sigma term and strange quark content from lattice QCD with exact chiral symmetry
• Measurement of Parton Distributions of Strange Quarks in the Nucleon from Charged-Kaon Production in Deep-Inelastic Scattering on the Deuteron
• The Polarised Valence Quark Distribution from semi-inclusive DIS
• Global Analysis of Nucleon Strange Form Factors at Low $Q^2$
• Nucleon Structure from Lattice QCD Using a Nearly Physical Pion Mass
• Two-loop renormalization of vector, axial-vector and tensor fermion bilinears on the lattice
• Nucleon strange quark content from two-flavor lattice QCD with exact chiral symmetry
• Strange Quark Contribution to the Vector and Axial Form Factors of the Nucleon: Combined Analysis of G0, HAPPEx, and Brookhaven E734 Data

Cited by in corpus (63)

• micrOMEGAs3.1 : a program for calculating dark matter observables
• The QCD axion, precisely
• FLAG Review 2019
• FLAG Review 2021
• Update on scalar singlet dark matter
• QCD and strongly coupled gauge theories: challenges and perspectives
• Parton distributions and lattice QCD calculations: a community white paper
• The Scalar Strange Content of the Nucleon from Lattice QCD
• Roy-Steiner-equation analysis of pion-nucleon scattering
• Probing exotic phenomena at the interface of nuclear and particle physics with the electric dipole moments of diamagnetic atoms: A unique window to hadronic and semi-leptonic CP violation
• From quarks to nucleons in dark matter direct detection
• The nucleon spin and momentum decomposition using lattice QCD simulations
• WIMP-nucleon scattering with heavy WIMP effective theory
• $\pi$N and strangeness sigma terms at the physical point with chiral fermions
• Nucleon axial form factors using lattice QCD simulations with a physical value of the pion mass
• Hypernuclear matter in a complete SU(3) symmetry group
• Strangeness and charmness content of nucleon from overlap fermions on 2+1-flavor domain-wall fermion configurations
• A viable QCD axion in the MeV mass range
• Up, down, and strange nucleon axial form factors from lattice QCD
• Chiral Effective Theory of Dark Matter Direct Detection
• Direct determinations of the nucleon and pion $\sigma$ terms at nearly physical quark masses
• Standard Model anatomy of WIMP dark matter direct detection I: weak-scale matching
• FLAG Review 2024
• Octet-baryon axial-vector charges and SU(3)-breaking effects in the semileptonic hyperon decays
• Uncertainties in WIMP Dark Matter Scattering Revisited
• Baryon mass splittings and strong CP violation in SU(3) Chiral Perturbation Theory
• Scalar strangeness content of the nucleon and baryon sigma terms
• Light Axial Vectors, Nuclear Transitions, and the ${}^8$Be Anomaly
• Flavor Structure of the Nucleon Sea
• Two Component Higgs-Portal Dark Matter
• Constraining the strangeness content of the nucleon by measuring the $\varphi$ meson mass shift in nuclear matter
• Disconnected contributions to the spin of the nucleon
• Moments of $\varphi$ meson spectral functions in vacuum and nuclear matter
• Review of the electric dipole moment of light nuclei
• Phi meson spectral moments and QCD condensates in nuclear matter
• Lattice Calculation of Nucleon Isovector Axial Charge with Improved Currents
• Signals of the QCD axion with mass of 17 MeV/c^2: nuclear transitions and light meson decays
• Octet baryon isovector charges from $N_f=2+1$ lattice QCD
• Strange and Charm Quark Spins from Anomalous Ward Identity
• Nuclear Reactions from Lattice QCD
• The Role of Nucleon Strangeness in Supernova Explosions
• Nucleon Sigma Terms with $N_f=2+1$ O($a$)-improved Wilson fermions
• Evolution Equations for Connected and Disconnected Sea Parton Distributions
• Renormalization Group Effects in Dark Matter Interactions
• Quark scalar, axial, and pseudoscalar charges in the Schwinger-Dyson formalism
• Dark matter in the $SO(5)\times U(1)$ gauge-Higgs unification
• Consistency between SU(3) and SU(2) chiral perturbation theory for the nucleon mass
• Chiral Effective Theory Methods and their Application to the Structure of Hadrons from Lattice QCD
• Perturbative Renormalization and Mixing of Quark and Glue Energy-Momentum Tensors on the Lattice
• Review of Hadron Structure Calculations on a Lattice
• Strange quark helicity in the proton from chiral effective theory
• Quark and Glue Components of the Proton Spin from Lattice Calculation
• Disconnected quark loop contributions to nucleon observables using $N_f=2$ twisted clover fermions at the physical value of the light quark mass
• Quark Spin in Proton from Anomalous Ward Indentity
• Strange quark content of the nucleon and dark matter searches
• Recent progress in hadron structure from Lattice QCD
• Dark matter from unification
• Symmetric point flavour singlet axial vector current renormalization at two loops
• Disconnected Quark Loop Contributions to Nucleon Structure
• New Physics Searches from Nucleon Matrix Elements in Lattice QCD
• Recent Progress in Lattice QCD
• Connected and disconnected quark contributions to hadron spin
• Lattice QCD calculations of the quark and gluon contributions to the proton spin