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Title:Measurement of high-mass dimuon production for p+p and p+d collisions with 120 GeV proton beam at Fermilab
Author(s):Prasad, Shivangi
Director of Research:Peng, Jen-Chieh
Doctoral Committee Chair(s):Beck, Douglas H
Doctoral Committee Member(s):Willenbrock, Scott S; Fields, Brian D
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Absolute cross section
Abstract:SeaQuest is a fixed-target experiment at Fermilab using 120 GeV proton beam from the Main Injector. High-mass muon pairs from the interaction of proton beam with various liquid and solid targets were detected in a newly constructed spectrometer. The primary goal of the experiment is to study the sea quark contents in nucleons and nuclei. In particular, the Drell-Yan cross-section ratios for liquid deuterium over hydrogen will allow the measurement of sea quark asymmetry, $\bar{d}/\bar{u}$, for Bjorken-{\it x} ranging from 0.1 to 0.45, extending the measurements of the previous experiment NuSea/E866. Improved statistics expected at SeaQuest for ${\it x}>0.25$ will allow us to check the surprising behaviour of $\bar{d}/\bar{u}$ at large {\it x} observed in NuSea. Additionally, SeaQuest data also provides the opportunity to study other very interesting physics. One such physics is the absolute p+d and p+p Drell-Yan differential cross-section ($M^3d^2\sigma/dMdx_F$). The measurement of the Drell-Yan cross-section allows improved constraints on the magnitude and shape of sea and valence parton distribution functions (PDFs). In particular, the p+d measurement is sensitive to the $\bar{d}(x)+\bar{u}(x)$ distribution. This quantity is required for extracting $\bar{d}(x)-\bar{u}(x)$ from $\bar{d}(x)/\bar{u}(x)$. The current global PDFs for light sea quarks are very poorly constrained beyond Bjorken-{\it x} $>$ 0.3. SeaQuest coverage in dimuon mass ($M_{\mu^-\mu^+}$) ranging from 4.2 GeV to 8.8 GeV (equivalently $\sqrt{\tau}$ in range 0.3 to 0.9 ) and Feynman-{\it x} ($x_F$) ranging from 0 to 0.8 will extend the measurement from NuSea. Current results are presented in chapter 5. A comparison of E866 p+d and E772 p+d measurement is presented in chapter 8. The transverse momentum dependence of the Drell-Yan cross-sections has also been presented. Results on double differential cross sections ($d^2\sigma/dMdp_T$ and $d^2\sigma/dx_Fdp_T$) from p+d and p+p Drell-Yan data from SeaQuest are presented in chapter 7. The analysis of $p_T$ distribution from SeaQuest data will provide the value of $$ for the lowest value of $\sqrt{s}$ in the study of dependence of $$ on $\sqrt{s}$. Additionally, $p_T$ data from existing Drell-Yan experiments have been analyzed and compiled systematically to study possible dependence such as $$ on $x_F$ and $M_{\mu^{-}\mu^{+}}$ of dimuon. The only published result on the dependence of $$ on $x_F$ has been reported by pion induced Drell-Yan experiment, E615. This thesis presents the dependence of $$ on $x_F$ for proton-induced Drell-Yan data from E866 and E906.
Issue Date:2020-11-19
Rights Information:Copyright 2020 Shivangi Prasad
Date Available in IDEALS:2021-03-05
Date Deposited:2020-12

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