Christian, D.C.
[38.763]
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Lambda0 polarization in 800-GeV/c p p --> p(f) (Lambda0 K+).

The E690 collaboration Felix, J. ; Berisso, M.C. ; Christian, D.C. ; et al.
Phys.Rev.Lett. 88 (2002) 061801, 2002.
Inspire Record 560899 DOI 10.17182/hepdata.42919

We report results from a study of Λ0 polarization in the exclusive reaction pp→pf(Λ0K+) at 800−GeV/c. We observe a dependence of the polarization on the Λ0K+ invariant mass with large (+71%) positive polarization at small mass (1.63−GeV/c2) and large (−43%) negative polarization at large mass (2.75−GeV/c2). This observation confirms the result of the CERN ISR R608 experiment and extends the range over which the effect is observed. The strong dependence of the polarization on the Λ0K+ invariant mass suggests that the origin of the polarization is closely related to the production dynamics of the diffractively produced Λ0K+ system.

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Diffractively produced charm final states in 800-GeV/c p p collisions.

Wang, M.H.L.S. ; Berisso, M.C. ; Christian, D.C. ; et al.
Phys.Rev.Lett. 87 (2001) 082002, 2001.
Inspire Record 539652 DOI 10.17182/hepdata.42947

We report the first observation of diffractively produced open charm in 800−GeV/c pp collisions of the type pp→pD*X. We measure cross sections of σdiff(D*+)=(0.185±0.044±0.054)μb and σdiff(D*−)=(0.174±0.034±0.029)μb. Our measurements are based on 4.3×109 events recorded by FNAL E690 in the fixed-target run of 1991. We compare our results with previous fixed-target charm experiments.

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