Production of Charmonium States in 225 Gev/c Negative Pion Beryllium Interactions

This thesis reports on the analysis of data obtained during FNAL experiment E610. The Chicago Cyclotron Magnet Spectrometer was used to perform a study of the hadronic production of charmonium. A 225 GeV/c negative pion beam was incident on a beryllium target. The trigger required a dimuon signature which favored opposite sign muon pairs with a large combined p(,(tau)). A search was then made for (chi) mesons of the charmonium spectrum by combining J/(psi) mesons found in the dimuon spectrum with photons detected in a large lead glass shower detector. These events were used to determine the fraction of J/(psi)s produced from (chi)s. A (psi)(3685) signal seen in the dimuon spectrum was used to determine the fraction of J/(psi)s resulting from (psi)(3685). Assuming that these are the only particles decaying to J/(psi), we obtain the fraction of J/(psi)s produced directly in hadronic collisions--0.58 (+OR-) 0.09--which is relevant to the production mechanism for charmonium in strong interactions.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Hahn, Stephen Robert

• Physics, Elementary Particles and High Energy

Language dc:language

eng

Identifier

(UMI)AAI8409941

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/77362