Asymmetry Studies in the Production of $$\Lambda^0/\bar \Lambda^0$$, $$\Xi^-/\bar{\Xi}^+$$ and $$\Omega^-/\bar{\Omega}^+$$ Hyperons in 500 GeV/c $$\pi^-$$ - Nucleon Interactions (in Portuguese)
- Rio de Janeiro, CBPF
Using data from fprmilab fixed-target experiment E791, we have measmed for the first time particle/antiparticle production asymmetries for$$\Lambda^0 \Xi^-$$ and $$\Omega^-$$ hyperons in $$\pi^-$$nucleon interactions at 500 GeV /c as joint functions of $$x_F$$ and $$p^2_{\tau}$$ over the ranges $$-0.12 \le x_F \le 0.12$$ and $$0 \le p^2_{\tau} \le 4 (GeV/c)^2$$. There is now direct evidence of a basic asymmetry, even at $$x_F$$ = 0.0, which may be due to associated production. In addition, there are leading-particle-type effects which are qualitativrly like what one would expect from rrcmnbination models or their alternatives. WP used the Dnal Parton Model (DPM) to cakulate the asymmetry for the $$\Lambda^0$$ and compared with the Lund model (PYTHIA /JETSET) predictions and with om experimental results.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1421679
- Report Number(s):
- FERMILAB-THESIS-1998-27; 487150
- Country of Publication:
- United States
- Language:
- Portuguese
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