Experimental determination of the complete spin structure for anti-proton + proton -> anti-Λ+ Λat anti-proton beam momentum of 1.637 GeV/c

Abstract

The reaction anti-proton + proton -> anti-Λ+ Λ-> anti-proton + π^+ + proton + π^- has been measured with high statistics at anti-proton beam momentum of 1.637 GeV/c. The use of a transversely-polarized frozen-spin target combined with the self-analyzing property of Λ/anti-Λdecay allows access to unprecedented information on the spin structure of the interaction. The most general spin-scattering matrix can be written in terms of eleven real parameters for each bin of scattering angle, each of these parameters is determined with reasonable precision. From these results all conceivable spin-correlations are determined with inherent self-consistency. Good agreement is found with the few previously existing measurements of spin observables in anti-proton + proton -> anti-Λ+ Λnear this energy. Existing theoretical models do not give good predictions for those spin-observables that had not been previously measured.

To be published in Phys. Rev. C. Tables of results (i.e. Ref. 24) are available at http://www-meg.phys.cmu.edu/~bquinn/ps185_pub/results.tab 24 pages, 16 figures

References in corpus (10)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• THE PROTON SPIN PUZZLE AND DEPOLARIZATION IN $\bar{p}p\to \bar{\Lambda }\Lambda$
• Hadronic Probes of the Polarized Intrinsic Strangeness of the Nucleon
• A Quark Model of Antilambda-Lambda Production in Pbar-P Interactions
• Measurement of Spin Transfer Observables in Antiproton-Proton -> Antilambda-Lambda at 1.637 GeV/c
• Spin Observables in Antilambda-Lambda Production from Antiproton-Proton Annihilation with a Transverse Inital State Polarization
• Constraints on spin observables in antiproton-proton to antiLambda-Lambda
• Constraints on spin observables in pbar p --> Lambdabar Lambda
• String model description of polarisation and angular distributions in pbar p -> Lambdabar Lambda at low energies
• Measurement of the $\overline{p}p\to K_S{K}_S\eta$ cross section at beam momenta in the regions of 1.45 and 1.7 GeV/c

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