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

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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 - Particles, Fields, Gravitation and Cosmology
Volume	85
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.85.054502
Publication status	Published - 1 Mar 2012

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Hart, A., Booth, S., Boyle, P., Del Debbio, L., Horsley, R., Kennedy, A., Kenway, R., Pendleton, B. & Zanotti, J.
EU government bodies
1/01/10 → 31/12/13
Project: Research

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Horsley, R., Bali, G., Collins, S., Gockeler, M., Nakamura, Y., Nobile, A., Pleiter, D., Rakow, P., Schafer, A., Schierholz, G., Sternbeck, A., & Zanotti, J. (2012). The strange and light quark contributions to the nucleon mass from lattice QCD. Physical Review D - Particles, Fields, Gravitation and Cosmology, 85(5), [054502]. https://doi.org/10.1103/PhysRevD.85.054502

Horsley, Roger ; Bali, Gunnar ; Collins, Sara ; Gockeler, Meinulf ; Nakamura, Yoshifumi ; Nobile, Andrea ; Pleiter, Dirk ; Rakow, Paul ; Schafer, Andreas ; Schierholz, Gerrit ; Sternbeck, Andrea ; Zanotti, James. / The strange and light quark contributions to the nucleon mass from lattice QCD. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2012 ; Vol. 85, No. 5.

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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 <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.",

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

year = "2012",

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doi = "10.1103/PhysRevD.85.054502",

language = "English",

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journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

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The strange and light quark contributions to the nucleon mass from lattice QCD. / Horsley, Roger; Bali, Gunnar; Collins, Sara; Gockeler, Meinulf; Nakamura, Yoshifumi; Nobile, Andrea; Pleiter, Dirk; Rakow, Paul; Schafer, Andreas; Schierholz, Gerrit; Sternbeck, Andrea; Zanotti, James.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 85, No. 5, 054502, 01.03.2012.

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

TY - JOUR

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 <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.

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 <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.

U2 - 10.1103/PhysRevD.85.054502

DO - 10.1103/PhysRevD.85.054502

M3 - Article

VL - 85

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 1550-7998

IS - 5

M1 - 054502

ER -

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

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