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Title A study of 3-pi production in gamma-p -> n-pi+pi+pi- and gamma-p -> Delta++pi+pi-pi- with CLAS at Jefferson Lab ->n
Abstract Apart from the mesons that the constituent quark model predicts, QCD allows for additional states beyond the qq system. Previous experiments have performed partial wave analysis on pion-production data and claim observation of an exotic JPC = 1-+ state decaying via p-pi. The g12 experiment took place at Jefferson Lab using the CLAS spectrometer, a liquid hydrogen target was used and a tagged photon beam. By studying the reactions gamma-p -> n-pi+pi+pi- and gamma-p -> Delta++pi+pi-pi-, the photoproduction of mesons decaying to 3-pi was studied using two different but complimentary channels. Events are selected with low four-momentum transfer to the baryon, in order to enhance one pion exchange production. For both 3-pi systems the data exhibit two intermediate decays, p-pi and f2pi. For the gamma-p -> n-pi+pi+pi- reaction over 600k events were acquired resulting in the largest 3 photoproduction dataset to date. The exotic JPC = 1-+ partial wave does not show resonant behavior and more
Author(s) Aristeidis Tsaris
Publication Date May 2016
Document Type Thesis
Primary Institution Thomas Jefferson National Accelerator Facility, Newport News
Affiliation Exp Nuclear Physics / Experimental Halls / Hall B
Funding Source Nuclear Physics (NP)
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-PHY-16-2443 OSTI Number: 1351257
LANL Number: Other Number: DOE/OR/23177-4115
Associated with an experiment Yes
Experiment Number(s)
E04-005
E04-017
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Thesis
Thesis Type PhD
Advisor Institution
1. Dennis Weygand Florida State University
Attachments/Datasets/DOI Link
Document(s)
Dataset(s) (none)
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