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10351.xml
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<oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1/" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><id>10351</id><datestamp>2020-03-09</datestamp><setSpec>DDC:5:53:530</setSpec>
<dc:title xml:lang="en">A lattice QCD study of nucleon structure with physical quark masses</dc:title>
<dc:creator>Hasan, Nesreen</dc:creator>
<dc:date>2020-03-09</dc:date>
<dc:identifier>http://elpub.bib.uni-wuppertal.de/edocs/dokumente/fbc/physik/diss2019/hasan</dc:identifier>
<dc:identifier>http://elpub.bib.uni-wuppertal.de/servlets/DocumentServlet?id=10351</dc:identifier>
<dc:identifier>urn:nbn:de:hbz:468-20200305-121945-5</dc:identifier>
<dc:identifier>https://doi.org/10.25926/19rj-ej28</dc:identifier>
<dc:identifier>http://elpub.bib.uni-wuppertal.de/servlets/DerivateServlet/Derivate-9678/dc1949.pdf</dc:identifier>
<dc:description xml:lang="en"><p>In this work, we compute various nucleon structure observables using the lattice regularization
of quantum chromodynamics, lattice QCD. Our calculations are performed
using 2 + 1-flavor ensembles with clover-improved Wilson fermions and cover three
sets of observables:<br>
The first set includes the computation of nucleon isovector axial, scalar, and tensor
charges. In particular, we focus on controlling the unwanted contributions from
excited states. Those charges quantify the coupling of nucleons to quark-level interactions
and play an important role in the analysis of the Standard Model and Beyond
the Standard Model (BSM) physics.<br>
The second set of observables includes the nucleon charge and axial radii measured
using a new and model-independent approach. We developed this approach to enable
the computation of the nucleon radii directly at zero momentum transfer and avoid the
systematic uncertainty originating from the large extrapolation commonly included
in the conventional methods used for measuring quantities like the nucleon charge
radius. Systematic errors of this kind have been proposed as a possible explanation
of the radius puzzle which refers to the > 5σ discrepancy between the experimental
electronic and muonic determinations of the charge radius of the proton.<br>
We perform the calculations of the nucleon charges and radii on two gauge ensembles
at the physical pion mass and with different lattice spacings.<br>
The last set of our calculation is devoted to measuring the nucleon axial form factors.
This calculation includes both quark-connected and -disconnected diagrams, which
allows us to determine the up, down, and strange form factors. This calculation is
done using a single ensemble with pion mass 317 MeV.</dc:description>
<dc:subject>500 Naturwissenschaften und Mathematik » 530 Physik » 530 Physik</dc:subject>
<dc:subject>Fakultät für Mathematik und Naturwissenschaften » Physik » Dissertationen</dc:subject>
<dc:type>Wissenschaftliche Abschlussarbeiten » Dissertation</dc:type>
<dc:language>eng</dc:language>
<dc:format>application/pdf</dc:format>
<dc:type>Text</dc:type>
</oai_dc:dc>