Strange quark momentum fraction from overlap fermion

Mingyang Sun; Yi Bo Yang; Keh Fei Liu; Ming Gong

Strange quark momentum fraction from overlap fermion

Mingyang Sun, Yi Bo Yang, Keh Fei Liu, Ming Gong

Physics And Astronomy

Research output: Contribution to journal › Conference article › peer-review

Abstract

We present a calculation of (x)_s for the strange quark in the nucleon. We also report the ratio of the strange (x) to that of u/d in the disconnected insertion which will be useful in constraining the global fit of parton distribution functions at small x. We adopt overlap fermion action on 2 + 1 flavor domain-wall fermion configurations on the 24³ x 64 lattice with a light sea quark mass which corresponds to m_π = 330 MeV. Smeared grid Z₃ sources are deployed to calculate the nucleon propagator with low-mode substitution. Even-odd grid sources and time-dilution technique with stochastic noises are used to calculate the high mode contribution to the quark loop. Low mode averaging (LMA) for the quark loop is applied to reduce the statistical error of the disconnected insertion calculation. We find the ratio (x)_s/(x)^DI_u/_d = 0.78(3) in this study.

Original language	English
Article number	142
Journal	Proceedings of Science
Volume	Part F130500
State	Published - 2014
Event	32nd International Symposium on Lattice Field Theory, LATTICE 2014 - New York, United States Duration: Jun 23 2014 → Jun 28 2014

Bibliographical note

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

ASJC Scopus subject areas

General

Cite this

@article{64d3275e96ba47df82f78c704763e545,

title = "Strange quark momentum fraction from overlap fermion",

abstract = "We present a calculation of (x)s for the strange quark in the nucleon. We also report the ratio of the strange (x) to that of u/d in the disconnected insertion which will be useful in constraining the global fit of parton distribution functions at small x. We adopt overlap fermion action on 2 + 1 flavor domain-wall fermion configurations on the 243 x 64 lattice with a light sea quark mass which corresponds to mπ = 330 MeV. Smeared grid Z3 sources are deployed to calculate the nucleon propagator with low-mode substitution. Even-odd grid sources and time-dilution technique with stochastic noises are used to calculate the high mode contribution to the quark loop. Low mode averaging (LMA) for the quark loop is applied to reduce the statistical error of the disconnected insertion calculation. We find the ratio (x)s/(x)DIu/d = 0.78(3) in this study.",

author = "Mingyang Sun and Yang, {Yi Bo} and Liu, {Keh Fei} and Ming Gong",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.; 32nd International Symposium on Lattice Field Theory, LATTICE 2014 ; Conference date: 23-06-2014 Through 28-06-2014",

year = "2014",

language = "English",

volume = "Part F130500",

}

TY - JOUR

T1 - Strange quark momentum fraction from overlap fermion

AU - Sun, Mingyang

AU - Yang, Yi Bo

AU - Liu, Keh Fei

AU - Gong, Ming

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

PY - 2014

Y1 - 2014

N2 - We present a calculation of (x)s for the strange quark in the nucleon. We also report the ratio of the strange (x) to that of u/d in the disconnected insertion which will be useful in constraining the global fit of parton distribution functions at small x. We adopt overlap fermion action on 2 + 1 flavor domain-wall fermion configurations on the 243 x 64 lattice with a light sea quark mass which corresponds to mπ = 330 MeV. Smeared grid Z3 sources are deployed to calculate the nucleon propagator with low-mode substitution. Even-odd grid sources and time-dilution technique with stochastic noises are used to calculate the high mode contribution to the quark loop. Low mode averaging (LMA) for the quark loop is applied to reduce the statistical error of the disconnected insertion calculation. We find the ratio (x)s/(x)DIu/d = 0.78(3) in this study.

AB - We present a calculation of (x)s for the strange quark in the nucleon. We also report the ratio of the strange (x) to that of u/d in the disconnected insertion which will be useful in constraining the global fit of parton distribution functions at small x. We adopt overlap fermion action on 2 + 1 flavor domain-wall fermion configurations on the 243 x 64 lattice with a light sea quark mass which corresponds to mπ = 330 MeV. Smeared grid Z3 sources are deployed to calculate the nucleon propagator with low-mode substitution. Even-odd grid sources and time-dilution technique with stochastic noises are used to calculate the high mode contribution to the quark loop. Low mode averaging (LMA) for the quark loop is applied to reduce the statistical error of the disconnected insertion calculation. We find the ratio (x)s/(x)DIu/d = 0.78(3) in this study.

UR - http://www.scopus.com/inward/record.url?scp=85030112629&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85030112629&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:85030112629

VL - Part F130500

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 142

T2 - 32nd International Symposium on Lattice Field Theory, LATTICE 2014

Y2 - 23 June 2014 through 28 June 2014

ER -

Strange quark momentum fraction from overlap fermion

Abstract

Bibliographical note

ASJC Scopus subject areas

Other files and links

Fingerprint

Cite this