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Title:Probing the flavor dependence of proton's light-quark sea in the SeaQuest experiment at Fermilab
Author(s):Dove, Jason
Director of Research:Peng, Jen-Chieh
Doctoral Committee Chair(s):Makins, Naomi
Doctoral Committee Member(s):Shelton, Jessie; Abbamonte, Peter
Department / Program:Physics
Discipline:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):nuclear
physics
proton
fixed target
parton distribution function
Fermilab
deep-inelastic scattering
E906
SeaQuest
Abstract:Surprisingly large flavor asymmetry of the light-quark sea in the proton was reported in deep-inelastic scattering and Drell-Yan experiments. The Bjorken-$x$ dependence of the $\bar{d}/\bar{u}$ ratio extracted from the Fermilab E866 experiment also revealed an intriguing drop at the highest values of $x$. The Fermilab E906/SeaQuest experiment was designed to measure $\bar{d}/\bar{u}$ with improved accuracy at high Bjorken-$x$. By detecting high-mass dimuon events produced in the interaction of 120 GeV proton beam with liquid hydrogen (LH$_2$) and deuterium (LD$_2$) targets, the SeaQuest experiment probes the $\bar{d}/\bar{u}$ ratio up to $x\approx 0.45$. Data collection has been completed and the status of data analysis for SeaQuest is presented. Two different methods for extracting the LD$_2$/LH$_2$ Drell-Yan cross section ratios for $0.1\leq x \leq 0.45$ are presented and the results are in reasonable agreement. These ratios allow for the extraction of $\bar{d}/\bar{u}$ revealing an absence of the drop at large $x$ reported earlier by E866. Results from this work are compared with various theoretical models for the flavor structure of the nucleon sea.
Issue Date:2020-07-23
Type:Thesis
URI:http://hdl.handle.net/2142/109313
Rights Information:Copyright 2020 Jason Dove
Date Available in IDEALS:2021-03-05
Date Deposited:2020-12


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