The available information about strange excited mesons is limited and most of the observed states have been reported but not
confirmed. While the low mass region (1.0 - 1.5 GeV) has been extensively studied in the past and states such as the K1(1270), K1(1400),
and K*(1410) have been confirmed by a handful of experiments, little is known about the spin-parity structure of resonances in the higher
K+ π+ π- mass region (1.5-2.0 GeV). Past experiments have used hadron beams to gain access to the K+ π+ π- system, and have provided
extensive information about strange states that made mapping their spectrum possible. Except for the K*(892), none of the excited strange
states has been photoproduced before. We perform a partial wave analysis on a photoproduced K+ π+ π- system produced off a Λ baryon using
the CLAS detector at Jefferson Lab. Using a photon beam incident of a liquid hydrogen target, we are able to reconstruct 16K events of the
γ p -> Λ K+ π+ π- topology. Results from initial data selection confirmed the dominance of two decay modes for a K+ π+ π- resonance:
the K*(892)π+ and the ρ(770)K+. A PWA was carried out in the helicity formalism using the reflectivity basis in the isobar model to
parametrize the decay amplitudes of the resonances. Resonating structures are found in the 1+S wave primarily coupling to K*(892)π+ with a
mass of 1.35 GeV/c2 and to ρ(770)K with a lower mass structure around 1.33 GeV/c2 and a higher mass resonance around 1.73 GeV/c2. The 1-P
also exhibited a significant resonating behavior with a mass of 1.43 GeV/c2 coupling primarily to the K*(892)π+ decay mode. Also observed,
an enhancement around 1.49 GeV/c2 in the 2+D wave strongly coupling to K*2 (1430)π+, and an enhancement in the 2-S wave around 1.76 GeV/c2
coupling primarily to K*2 (1430)π+. / A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for
the degree of Doctor of Philosophy. / Spring Semester 2016. / April 11, 2016. / Data Analysis, Hadrons, KPiPi, Particle Physics, Photoproduction, PWA / Includes bibliographical references. / Paul Eugenio, Professor Directing Dissertation; James Justus, University Representative; Volker
Crede, Committee Member; Simon Capstick, Committee Member; Alexander Ostrovidov, Committee Member; Horst Wahl, Committee
Member.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_360310 |
| Contributors | Al Ghoul, Hussein (authoraut), Eugenio, Paul Michael (professor directing dissertation), Justus, James (university representative), Crede, Volker (committee member), Capstick, Simon (committee member), Ostrovidov, Alexander (committee member), Wahl, Horst D. (committee member), Florida State University (degree granting institution), College of Arts and Sciences (degree granting college), Department of Physics (degree granting department) |
| Publisher | Florida State University |
| Source Sets | Florida State University |
| Language | English, English |
| Detected Language | English |
| Type | Text, text |
| Format | 1 online resource (183 pages), computer, application/pdf |
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