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Light anti-quark flavor asymmetry in the nucleon sea and the nuclear dependence of anti-quarks in nuclei at the SeaQuest Experiment
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Tadepalli, Arun S.. Light anti-quark flavor asymmetry in the nucleon sea and the nuclear dependence of anti-quarks in nuclei at the SeaQuest Experiment. Retrieved from https://doi.org/doi:10.7282/t3-2ccn-7w70

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TitleLight anti-quark flavor asymmetry in the nucleon sea and the nuclear dependence of anti-quarks in nuclei at the SeaQuest Experiment
NameTadepalli, Arun S. (author); Gilman, Ronald (chair); Chou, John Paul (internal member); Ransome, Ron (internal member); Kloet, Wim (internal member); Reimer, Paul (outside member); Rutgers University; School of Graduate Studies
Date Created2019
Other Date2019-10 (degree)
SubjectPhysics and Astronomy, Flavor asymmetry, Quantum flavor dynamics
Extent1 online resource (xxxiii, 270 pages) : illustrations
DescriptionFermilab E906/SeaQuest is an experiment aimed at studying the anti-quark distributions of nucleons and nuclei. The experiment uses a 120 GeV/c proton beam extracted from the Main Injector at Fermilab to collide with various solid and cryogenic targets to study a variety of physics topics. The experiment takes advantage of the Drell-Yan process in order to probe specifically the high-x anti-quark distributions of the target nucleus. The acceptance of the spectrometer is tuned to explore the unprecedentedly high Bjorken-x region, thereby extending our knowledge of the anti-quark sea structure of nucleons and nuclei.
A new Intensity-Extrapolation method was developed to counter the rate dependence challenge at SeaQuest. Using this method, the ratio of cross sections of liquid deuterium and liquid hydrogen, σpd(x)/2σpp(x), was measured in the range0.1≤xT≤0.45. The results have been found to be consistently above 1 for all values of the measured range of xT. Also, a first look at ̄d(x)/ ̄u(x) is presented. The trend of the data points indicate that the ratio is consistently above 1 for the measured range of xT. These results (when combined with more data) will provide a key input in constraining many theoretical models that attempt to explain the origin of the nucleon sea.
Using the same method, the nuclear dependence of the per-nucleon cross section ratio, RpA, of carbon, iron and tungsten versus deuterium studied as a function of xT, pT, and xF are reported. The results for xT are consistent with E772 indicating little nuclear dependence. A striking A (atomic mass) dependence in which there is a depletion of low-pT dimuons and an excess of high-pT dimuons relative to deuterium is reported. Also, an A dependence for the drop in RpA(xF) for increasing xF is presented. An analysis with and without the cut xT>0.16 (which removes the effects of the shadowing) gives consistent results indicating that the effects of shadowing are small. These results (when combined with more data) will address important questions on the modification of anti-quark distributions in nuclei and in modeling energy loss for partons traversing a cold nuclear medium.
NotePh.D.
NoteIncludes bibliographical references
Genretheses, ETD doctoral
Persistent URLhttps://doi.org/doi:10.7282/t3-2ccn-7w70
LanguageEnglish
CollectionSchool of Graduate Studies Electronic Theses and Dissertations
Organization NameRutgers, The State University of New Jersey
RightsThe author owns the copyright to this work.
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