Measuring the Nucleon Strangeness and Related Matrix Elements Using Lattice QCD

Persistent Link:
http://hdl.handle.net/10150/202951
Title:
Measuring the Nucleon Strangeness and Related Matrix Elements Using Lattice QCD
Author:
Freeman, Walter
Issue Date:
2011
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
We calculate the strange quark content of the nucleon, <N|ss|N> − <0|ss|0> using a novel method with the MILC lattice QCD gauge ensembles. The strangeness of the nucleon is related to the interaction cross section between dark matter and ordinary nuclear matter (e.g. in detectors) in many models. Previous results for this quantity suffered from uncontrolled systematic errors and/or large statistical uncertainties. The first result using our methods was the first modern calculation of the strangeness of the nucleon[76] with good control of systematic errors and reasonably small statistical errors, greatly reducing the uncertainty in dark matter detection cross sections. A refinement of this method allows for further reduction of statistical error. On the MILC Asqtad data, we obtain <N|ss|N> = 0.637(55)(stat)(74)(sys). The results obtained from this method are consistent with those obtained from other commonly-used methods applied to the MILC data. We also calculate the disconnected part of the pion-nucleon sigma term and the intrinsic charm of the nucleon using this method. The intrinsic charm has large statistical errors but is consistent with a perturbative calculation.
Type:
text; Electronic Dissertation
Keywords:
MILC; Nucleon strangeness; Quark condensate; Physics; Computational physics; Lattice QCD
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Physics
Degree Grantor:
University of Arizona
Advisor:
Toussaint, Doug

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleMeasuring the Nucleon Strangeness and Related Matrix Elements Using Lattice QCDen_US
dc.creatorFreeman, Walteren_US
dc.contributor.authorFreeman, Walteren_US
dc.date.issued2011-
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractWe calculate the strange quark content of the nucleon, <N|ss|N> − <0|ss|0> using a novel method with the MILC lattice QCD gauge ensembles. The strangeness of the nucleon is related to the interaction cross section between dark matter and ordinary nuclear matter (e.g. in detectors) in many models. Previous results for this quantity suffered from uncontrolled systematic errors and/or large statistical uncertainties. The first result using our methods was the first modern calculation of the strangeness of the nucleon[76] with good control of systematic errors and reasonably small statistical errors, greatly reducing the uncertainty in dark matter detection cross sections. A refinement of this method allows for further reduction of statistical error. On the MILC Asqtad data, we obtain <N|ss|N> = 0.637(55)(stat)(74)(sys). The results obtained from this method are consistent with those obtained from other commonly-used methods applied to the MILC data. We also calculate the disconnected part of the pion-nucleon sigma term and the intrinsic charm of the nucleon using this method. The intrinsic charm has large statistical errors but is consistent with a perturbative calculation.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjectMILCen_US
dc.subjectNucleon strangenessen_US
dc.subjectQuark condensateen_US
dc.subjectPhysicsen_US
dc.subjectComputational physicsen_US
dc.subjectLattice QCDen_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplinePhysicsen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorToussaint, Dougen_US
dc.contributor.committeememberStafford, Charlesen_US
dc.contributor.committeememberBickel, Williamen_US
dc.contributor.committeememberCronin, Alexen_US
dc.contributor.committeememberShupe, Michaelen_US
dc.contributor.committeememberToussaint, Dougen_US
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