Flavor Dependence of Hadroproduced Charm Strange Mesons

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/1425821· OSTI ID:1425821

Jedicke, Robert ^[1]

---

1. Toronto U.

Experiment 769 at the Tagged Photon Laboratory of the Fermi National Accelerator Laboratory wrote approximately 400x$10^6$ events to tape from the reactions of a tagged hadronic beam consisting of $$\pi$$, K and p. The interactions took place within a foil target assembly including targets ofW, Be, Cu and Al. We use the D8 meson to determine ifthere exists a dependence of the production properties of the meson on the incident beam particle flavour. A total sample of 83±13 $$D_s$$ mesons in the $$\phi \pi$$ and $K^* K$ decay modes yields 29±8, 15±5 and 5.6±4.2 $$D_s$$ mesons using only the transverse energy trigger for the $$\pi$$, K and p beams respectively. This is the world's largest sample of kaon induced $$D_s$$ mesons. This indicates an average $$\sigma$$ •B (normalizing B($$D_s \to tK^*K$$) to B($$D_s \to \phi \pi$$)) over the two modes of 0.036±0.015μb/nucleon, 0.044±0.018μb/nucleon and 0.035±0.025μb/nucleon for each of the three different beam particles respectively using $$A^{0.95 ± 0.05}$$ for $$X_F$$ > O. These values are consistent with recent measurements by the ACCMOR collaboration at CERN. The absolute cross sections for production of $$D_s$$ by each of the three beam particles are calculated using the world average of the branching ratio to the $$\phi \pi$$ decay mode. Assuming that all systematic errors cancel, the ratio of the K to $$\pi$$ absolute $$D_s$$ production cross section is found to be 1.2 ± 0.7 for $$X_F$$ > O. The $$X_F$$ and $PT^2$ distributions of the Ds mesons for all three beam particles are also presented. All of these results are compared to QCD predictions as well as the LUND Monte Carlo. The differential distributions are consistent to within errors with other experimental results. We find no evidence for a flavour dependence of the production of the $$D_s$$ meson in the total and differential cross sections.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1425821
• Report Number(s): FERMILAB-THESIS-1992-06; UMI-315-73775-1; 347308
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS