Electroproduction of Neutral Pion Off Helium-4

<p>Deeply virtual exclusive processes offer a unique opportunity to study the internal structure of the nucleon and nuclei. The goal of this work is to extract the beam-spin asymmetry in deeply virtual coherent neutral pion electroproduction, <em>e</em>⁴He → <em>e′</em>⁴He′π⁰, using the CLAS detector in the experimental Hall B at Thomas Jefferson National Accelerator Facility. The data were collected in 2009 with a 6 GeV longitudinally polarized electron beam impinging on a 30 cm long, 6 atm Helium-4 gaseous target. In order to ensure that the process is coherent, a new Radial Time Projection Chamber was used to detect and identify low energy recoil <em>α</em>-particles. The Beam Spin Asymmetry in the coherent deep exclusive regime was measured at <em>Q</em>² = 1.50 GeV^2, X<em>B</em> = 0.18 and −t = 0.14 GeV². The measured asymmetry has an amplitude of 10%±5% and has the opposite sign compared the asymmetry measured for π⁰ production on the proton.</p>

Name thesis:degree_name

Doctor of Philosophy (PhD)

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date.available

2016

Author dc:creator

• Torayev, Bayram

Contributors dc:contributor

• Stephen Bueltmann
• Sabastian Kuhn
• Rocco Schiavilla
• Alex Godunov
• Jennifer Poutsma

• Electroproduction
• Nucleon
• Nuclei
• Polarized electron beam
• Radical time projection chamber
• Nuclear
• Physics

Statement dc:rights

• <p>In Copyright. URI: <a href="http://rightsstatements.org/vocab/InC/1.0/">http://rightsstatements.org/vocab/InC/1.0/</a> This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).</p>

Identifier

9781369571509

OAI identifier oai:identifier

oai:digitalcommons.odu.edu:physics_etds-1006