Asymmetries Between the Production of Ds- and Ds+ Mesons from 500 GeV/c pi- Nucleon Interactions as Functions of x_F and square of p_t

Abstract

This paper presents measurements of the production of Ds- mesons relative to Ds+ mesons as functions of x_F and square of p_t for a sample of 2445 Ds decays to phi pi. The Ds mesons were produced in Fermilab experiment E791 with 500 GeV/c pi- mesons incident on one platinum and four carbon foil targets. The acceptance-corrected integrated asymmetry in the x_F range -0.1 to 0.5 for Ds+- mesons is 0.032 +- 0.022 +- 0.022, consistent with no net asymmetry. The results, as functions of x_F and square of p_t, are compared to predictions and to the large production asymmetry observed for D+- mesons in the same experiment. These comparisons support the hypothesis that production asymmetries come from the fragmentation process and not from the charm quark production itself.

Latex file (11 pages) and three eps files for figures This paper has been accepted for publication by Physics Letters B

References in corpus (1)

• The E791 Parallel Architecture Data Acquisition System

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