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Title: Probing the Spin Structure of the Proton Using Polarized Proton-Proton Collisions and the Production of W Bosons

Abstract

This thesis discusses the process of extracting the longitudinal asymmetry, A$$W±\atop{L}$$ describing W → μ production in forward kinematic regimes. This asymmetry is used to constrain our understanding of the polarized parton distribution functions characterizing $$\bar{u}$$ and $$\bar{d}$$ sea quarks in the proton. This asymmetry will be used to constrain the overall contribution of the sea-quarks to the total proton spin. The asymmetry is evaluated over the pseudorapidity range of the PHENIX Muon Arms, 2.1 < |η| 2.6, for longitudinally polarized proton-proton collisions at 510 GeV √s. In particular, I will discuss the statistical methods used to characterize real muonic W decays and the various background processes is presented, including a discussion of likelihood event selection and the Extended Unbinned Maximum Likelihood t. These statistical methods serve estimate the yields of W muonic decays, which are used to calculate the longitudinal asymmetry.

Authors:
 [1]
  1. Univ. of California, Riverside, CA (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1338472
Report Number(s):
BNL-113351-2016-TH
TRN: US1701432
DOE Contract Number:
SC00112704
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PROTON-PROTON INTERACTIONS; W MINUS BOSONS; W PLUS BOSONS; PROTONS; POLARIZED BEAMS; DISTRIBUTION FUNCTIONS; MAXIMUM-LIKELIHOOD FIT; SPIN; ASYMMETRY; U QUARKS; D QUARKS; MUONS; GEV RANGE 100-1000; PARTICLE RAPIDITY; WEAK PARTICLE DECAY; YIELDS

Citation Formats

Beaumier, Michael J. Probing the Spin Structure of the Proton Using Polarized Proton-Proton Collisions and the Production of W Bosons. United States: N. p., 2016. Web. doi:10.2172/1338472.
Beaumier, Michael J. Probing the Spin Structure of the Proton Using Polarized Proton-Proton Collisions and the Production of W Bosons. United States. doi:10.2172/1338472.
Beaumier, Michael J. Mon . "Probing the Spin Structure of the Proton Using Polarized Proton-Proton Collisions and the Production of W Bosons". United States. doi:10.2172/1338472. https://www.osti.gov/servlets/purl/1338472.
@article{osti_1338472,
title = {Probing the Spin Structure of the Proton Using Polarized Proton-Proton Collisions and the Production of W Bosons},
author = {Beaumier, Michael J.},
abstractNote = {This thesis discusses the process of extracting the longitudinal asymmetry, A$W±\atop{L}$ describing W → μ production in forward kinematic regimes. This asymmetry is used to constrain our understanding of the polarized parton distribution functions characterizing $\bar{u}$ and $\bar{d}$ sea quarks in the proton. This asymmetry will be used to constrain the overall contribution of the sea-quarks to the total proton spin. The asymmetry is evaluated over the pseudorapidity range of the PHENIX Muon Arms, 2.1 < |η| 2.6, for longitudinally polarized proton-proton collisions at 510 GeV √s. In particular, I will discuss the statistical methods used to characterize real muonic W decays and the various background processes is presented, including a discussion of likelihood event selection and the Extended Unbinned Maximum Likelihood t. These statistical methods serve estimate the yields of W muonic decays, which are used to calculate the longitudinal asymmetry.},
doi = {10.2172/1338472},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2016},
month = {Mon Aug 01 00:00:00 EDT 2016}
}

Technical Report:

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