The strange and light quark contributions to the nucleon mass from lattice QCD

Roger Horsley; Gunnar Bali; Sara Collins; Meinulf Gockeler; Yoshifumi Nakamura; Andrea Nobile; Dirk Pleiter; Paul Rakow; Andreas Schafer; Gerrit Schierholz; Andrea Sternbeck; James Zanotti

doi:10.1103/PhysRevD.85.054502

The strange and light quark contributions to the nucleon mass from lattice QCD

Roger Horsley, Gunnar Bali, Sara Collins, Meinulf Gockeler, Yoshifumi Nakamura, Andrea Nobile, Dirk Pleiter, Paul Rakow, Andreas Schafer, Gerrit Schierholz, Andrea Sternbeck, James Zanotti

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We determine the strangeness and light quark fractions of the nucleon mass by computing the quark line connected and disconnected contributions to the matrix elements m_q <N|qbar q|N> in lattice QCD, using the non-perturbatively improved Sheikholeslami-Wohlert Wilson Fermionic action. We simulate n_F=2 mass degenerate sea quarks with a pion mass of about 285 MeV and a lattice spacing a approx 0.073 fm. The renormalization of the matrix elements involves mixing between contributions from different quark flavours. The pion-nucleon sigma-term is extrapolated to physical quark masses exploiting the sea quark mass dependence of the nucleon mass. We obtain the renormalized values \sigma_{\pi N} = 38(12) MeV at the physical point and f_{T_s}=\sigma_s/m_N= 0.012(14)^{+10}_{-3} for the strangeness contribution at our larger than physical sea quark mass.

Original language	English
Article number	054502
Number of pages	10
Journal	Physical Review D
Volume	85
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.85.054502
Publication status	Published - 1 Mar 2012

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10.1103/PhysRevD.85.054502

EC: STRONGNET
Hart, A. (Principal Investigator), Booth, S. (Co-investigator), Boyle, P. (Co-investigator), Del Debbio, L. (Co-investigator), Horsley, R. (Co-investigator), Kennedy, A. (Co-investigator), Kenway, R. (Co-investigator), Pendleton, B. (Co-investigator) & Zanotti, J. (Co-investigator)
EU government bodies
1/01/10 → 31/12/13
Project: Research

Cite this

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title = "The strange and light quark contributions to the nucleon mass from lattice QCD",

abstract = "We determine the strangeness and light quark fractions of the nucleon mass by computing the quark line connected and disconnected contributions to the matrix elements m_q in lattice QCD, using the non-perturbatively improved Sheikholeslami-Wohlert Wilson Fermionic action. We simulate n_F=2 mass degenerate sea quarks with a pion mass of about 285 MeV and a lattice spacing a approx 0.073 fm. The renormalization of the matrix elements involves mixing between contributions from different quark flavours. The pion-nucleon sigma-term is extrapolated to physical quark masses exploiting the sea quark mass dependence of the nucleon mass. We obtain the renormalized values \sigma_{\pi N} = 38(12) MeV at the physical point and f_{T_s}=\sigma_s/m_N= 0.012(14)^{+10}_{-3} for the strangeness contribution at our larger than physical sea quark mass.",

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T1 - The strange and light quark contributions to the nucleon mass from lattice QCD

AU - Horsley, Roger

AU - Bali, Gunnar

AU - Collins, Sara

AU - Gockeler, Meinulf

AU - Nakamura, Yoshifumi

AU - Nobile, Andrea

AU - Pleiter, Dirk

AU - Rakow, Paul

AU - Schafer, Andreas

AU - Schierholz, Gerrit

AU - Sternbeck, Andrea

AU - Zanotti, James

PY - 2012/3/1

Y1 - 2012/3/1

N2 - We determine the strangeness and light quark fractions of the nucleon mass by computing the quark line connected and disconnected contributions to the matrix elements m_q in lattice QCD, using the non-perturbatively improved Sheikholeslami-Wohlert Wilson Fermionic action. We simulate n_F=2 mass degenerate sea quarks with a pion mass of about 285 MeV and a lattice spacing a approx 0.073 fm. The renormalization of the matrix elements involves mixing between contributions from different quark flavours. The pion-nucleon sigma-term is extrapolated to physical quark masses exploiting the sea quark mass dependence of the nucleon mass. We obtain the renormalized values \sigma_{\pi N} = 38(12) MeV at the physical point and f_{T_s}=\sigma_s/m_N= 0.012(14)^{+10}_{-3} for the strangeness contribution at our larger than physical sea quark mass.

AB - We determine the strangeness and light quark fractions of the nucleon mass by computing the quark line connected and disconnected contributions to the matrix elements m_q in lattice QCD, using the non-perturbatively improved Sheikholeslami-Wohlert Wilson Fermionic action. We simulate n_F=2 mass degenerate sea quarks with a pion mass of about 285 MeV and a lattice spacing a approx 0.073 fm. The renormalization of the matrix elements involves mixing between contributions from different quark flavours. The pion-nucleon sigma-term is extrapolated to physical quark masses exploiting the sea quark mass dependence of the nucleon mass. We obtain the renormalized values \sigma_{\pi N} = 38(12) MeV at the physical point and f_{T_s}=\sigma_s/m_N= 0.012(14)^{+10}_{-3} for the strangeness contribution at our larger than physical sea quark mass.

U2 - 10.1103/PhysRevD.85.054502

DO - 10.1103/PhysRevD.85.054502

M3 - Article

SN - 1550-7998

VL - 85

JO - Physical Review D

JF - Physical Review D

IS - 5

M1 - 054502

ER -

The strange and light quark contributions to the nucleon mass from lattice QCD

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