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Title: Semi-inclusive Lambda electroproduction in the target fragmentation region at CLAS
Author: Phillips, Jeffrey John
ISNI:       0000 0004 5373 0154
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 2015
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Studies into the spin structure of the proton have been an active area of research after the EMC experiment and others found that only 30% of the total proton spin is carried by the valence quarks. Hadron production in Semi-Inclusive Deep Inelastic Scattering (SIDIS) is one way to study this phenomenon and is the focus of this thesis, which describes the measurement of the polarisation of the Lambda. Hadron production is generally examined in the Current Fragmentation Region (CFR), where the detected hadron originates from the struck quark, in terms of parton distribution and fragmentation functions. Conversely in the Target Fragmentation Region (TFR), the hadron is produced in the fragmentation of the target remnants. In this region the process is described by Fracture Functions which represent the joint probability of producing the final hadron from the target remnants when a parton of the target nucleon is struck by the virtual photon. We propose to aid in the understanding of these functions by extracting the transferred polarisation of Lambda in the SIDIS electroproduction of the hadron from a proton target: ep -> Lambda e' X . In this work, data recorded with the CLAS detector system at Thomas Jefferson National Laboratory during the e1f experimental run with a longitudinally polarised beam on an unpolarised target were analysed. The polarisation of the Lambda has been extracted by using the Maximum Likelihood Extraction (MLE) and Beam Spin Asymmetry (BSA) methods.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics