Dijet production in polarized proton-proton collisions at [the square root of sigma] = 200 GeV

Polarized deep inelastic scattering (DIS) experiments indicate that quarks only carry approximately 30% of the proton spin, which led to interest in measuring the contributions of other components. Through polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC), the world's only polarized proton collider, it is possible to make an extraction of the polarized gluon distribution function [delta]g(x). This function describes the contribution of the gluon polarization to the proton spin. This thesis presents a measurement of the p + p ---> Jet + Jet + X (dijet) cross section from the 2005 RHIC running period and a measurement of the longitudinal double spin asymmetry ALL from the 2009 RHIC running period, both made using the Solenoidal Tracker at RHIC (STAR). The cross section is measured over the invariant mass range 20 < M < 116 GeV/c 2 with systematic uncertainties between 20 and 50%, driven by the jet energy scale uncertainty. The asymmetry is measured over the invariant mass range 20 < M < 80 GeV/c 2 in three different detector acceptances. The asymmetry measurement is compared to several theory scenarios in each of the detector acceptances, which allows extraction of the shape of the polarized gluon distribution function [delta]g(x). The results are consistent with a small, but positive, total gluon polarization.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Physics.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2011

Author dc:creator

• Walker, Matthew (Matthew Hsing Hung)

Advisor dc:contributor.advisor

• Bernd Surrow.

• Physics.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/68880

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/68880