Production of charm mesons by high energy neutrons

"The charmed mesons D""'±, DO, and D; have been observed in neutron-nucleus collisions at the FNAL Tevatron. A sample of 134 ± 19 events was investigated in the decay D""'±-+ D°1r± with the subsequent decay mode D°-+ K+ K-. The cross section per nucleon for D""'±, at most probable energy ...;s = 35 GeV, was measured to be: d:(xf) . BR = 2.11 ± .43 (±.63)JLb/nucleon Xf for 0.0 < x f < 0.14 (xf = .07). The branching ratio (BR) is defined as: BR =BR(D'"" -+ D1r) x BR(D -+ K+ K-). The dependence of the cross section per nucleus on number of nucleons in the target was fit to a form A a and it was found that a = .96 .17. A sample of 64 ±.16 D; events was investigated for the decay D; -+ 4>1r±. The differential cross section for D; production averaged over the particle and antiparticle states is: 1 (dO'(D+) dO'(D-») BR· ""2 dx fS + dx / = 2.85 ± 0.80 ± .86 JLb/nucleon at x f = 0.175 where the first error is statistical and the second error is systematic. The branching fraction is defined as BR =BR(Ds -+ 4>n'), and a linear A dependence was assumed."

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Shipbaugh, Calvin Leroy

Contributors dc:contributor

• Wiss, J.E.

• FNAL Tevatron
• charm mesons
• high energy neutrons
• neutron-nucleus collisions

Statement dc:rights

• 1988 Calvin Leroy Shipbaugh

Language dc:language

en

Identifier

3478307

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/23910