Strangeness and glue in the nucleon from lattice QCD

Strangeness and glue in the nucleon from lattice QCD

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Abstract

We study the strangeness contribution to nucleon matrix elements using N_f = 2 + 1 dynamical clover fermion configurations generated by the CP-PACS/JLQCD collaboration. In order to evaluate the disconnected insertion (DI), we use the Z(4) stochastic method, along with unbiased subtraction from the hopping parameter expansion which reduces the off-diagonal noises in the stochastic method. Furthermore, we find that using many nucleon sources for each configuration is effective in improving the signal. Our results for the quark contribution to the first moment hxi_q in the DI, and the strangeness magnetic moment show that the statistical errors are under control with these techniques. We also study the gluonic contribution to the nucleon using the overlap operator to construct the gauge field tensor, F_µ . The application to the calculation of first moment, hxi_G, gives a good signal in quenched lattice QCD.

Original language	English
Journal	Proceedings of Science
Volume	66
State	Published - 2008
Event	26th International Symposium on Lattice Field Theory, LATTICE 2008 - Williamsburg, United States Duration: Jul 14 2008 → Jul 19 2008

Bibliographical note

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

Funding

We thank the CP-PACS/JLQCD collaboration for their configurations. This work was supported in part by U.S. DOE grant DE-FG05-84ER40154. Research of N.M. is supported by Ra-manujan Fellowship. The calculation was performed on supercomputers at Jefferson Laboratory and the University of Kentucky.

Funders	Funder number
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research Laboratory	DE-FG05-84ER40154

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Cite this

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title = "Strangeness and glue in the nucleon from lattice QCD",

abstract = "We study the strangeness contribution to nucleon matrix elements using Nf = 2 + 1 dynamical clover fermion configurations generated by the CP-PACS/JLQCD collaboration. In order to evaluate the disconnected insertion (DI), we use the Z(4) stochastic method, along with unbiased subtraction from the hopping parameter expansion which reduces the off-diagonal noises in the stochastic method. Furthermore, we find that using many nucleon sources for each configuration is effective in improving the signal. Our results for the quark contribution to the first moment hxiq in the DI, and the strangeness magnetic moment show that the statistical errors are under control with these techniques. We also study the gluonic contribution to the nucleon using the overlap operator to construct the gauge field tensor, Fµ . The application to the calculation of first moment, hxiG, gives a good signal in quenched lattice QCD.",

author = "Takumi Doi and Mridupawan Deka and Dong, {Shao Jing} and Terrence Draper and Liu, {Keh Fei} and Devdatta Mankame and Nilmani Mathur and Thomas Streuer",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.; 26th International Symposium on Lattice Field Theory, LATTICE 2008 ; Conference date: 14-07-2008 Through 19-07-2008",

year = "2008",

language = "English",

volume = "66",

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TY - JOUR

T1 - Strangeness and glue in the nucleon from lattice QCD

AU - Doi, Takumi

AU - Deka, Mridupawan

AU - Dong, Shao Jing

AU - Draper, Terrence

AU - Liu, Keh Fei

AU - Mankame, Devdatta

AU - Mathur, Nilmani

AU - Streuer, Thomas

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

PY - 2008

Y1 - 2008

N2 - We study the strangeness contribution to nucleon matrix elements using Nf = 2 + 1 dynamical clover fermion configurations generated by the CP-PACS/JLQCD collaboration. In order to evaluate the disconnected insertion (DI), we use the Z(4) stochastic method, along with unbiased subtraction from the hopping parameter expansion which reduces the off-diagonal noises in the stochastic method. Furthermore, we find that using many nucleon sources for each configuration is effective in improving the signal. Our results for the quark contribution to the first moment hxiq in the DI, and the strangeness magnetic moment show that the statistical errors are under control with these techniques. We also study the gluonic contribution to the nucleon using the overlap operator to construct the gauge field tensor, Fµ . The application to the calculation of first moment, hxiG, gives a good signal in quenched lattice QCD.

AB - We study the strangeness contribution to nucleon matrix elements using Nf = 2 + 1 dynamical clover fermion configurations generated by the CP-PACS/JLQCD collaboration. In order to evaluate the disconnected insertion (DI), we use the Z(4) stochastic method, along with unbiased subtraction from the hopping parameter expansion which reduces the off-diagonal noises in the stochastic method. Furthermore, we find that using many nucleon sources for each configuration is effective in improving the signal. Our results for the quark contribution to the first moment hxiq in the DI, and the strangeness magnetic moment show that the statistical errors are under control with these techniques. We also study the gluonic contribution to the nucleon using the overlap operator to construct the gauge field tensor, Fµ . The application to the calculation of first moment, hxiG, gives a good signal in quenched lattice QCD.

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M3 - Conference article

AN - SCOPUS:85030092498

VL - 66

JO - Proceedings of Science

JF - Proceedings of Science

T2 - 26th International Symposium on Lattice Field Theory, LATTICE 2008

Y2 - 14 July 2008 through 19 July 2008

ER -

Strangeness and glue in the nucleon from lattice QCD

Abstract

Bibliographical note

Funding

ASJC Scopus subject areas

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