Distinguishing exotic states from scattering states in lattice QCD

This work explores the problem of distinguishing potentially interesting new exotic states in QCD from conventional scattering states using lattice QCD, and addresses the specific case of the search for localized resonances in a system of five quarks. We employ a complete basis of local interpolating operators, as well as a number of spatially distributed operators, to search for localized resonances in the system of five quarks. Motivated by initially promising experimental searches for the 8+(1540) pentaquark, we have set out to implement new approaches, both on the theoretical and computational side, to allow for calculations deemed infeasible by other groups searching for pentaquarks on the lattice. We restrict our system of five quarks to the quantum numbers of the O+(1540) pentaquark and get an insight into the structure of its states, calculate their energies and explore their properties. Finally, we use the obtained results to discriminate between scattering and exotic states. The calculation is performed in the quenched approximation with heavy Wilson fermions.

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Physics

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2008

Author dc:creator

• Sigaev, Dmitry

Advisor dc:contributor.advisor

• John W. Negele.

• 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/1721.1/45441

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/45441