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HK: Hadronen und Kerne

HK 26: Hadronisch wechselwirkende Sonden I

HK 26.3: Talk

Tuesday, March 25, 1997, 15:00–15:15, HS H

Probing leading effects in Σ⁻–nucleus collisions by charm production [1] — •Eugene Chudakov — Universität Heidelberg

Leading effects cause differences between the production of particles which have quarks in common with the beam (leading particles) and those that do not (not-leading particles). In order to explore the role of this effect for the production of charmed hadrons, the WA89 collaboration at CERN studied the production of D-mesons and Λ_c baryons by a 340 GeV/c Σ⁻ hyperon beam. Relative yields of leading (e.g. D⁻) and non-leading (e.g. D⁺) charmed mesons will be compared to results from previous experiments using π⁻ and proton beams [2]. In addition first results on the ratio Λ_c⁺ / Λ_c⁻ will be presented.

[1] supported by the BMBF under contract numbers 05 5HD15I, 06 HD524I and 06 MZ5265

[2] M. Adamovich et al., Phys. Lett. B 305, 402 (1993).