Application of Straw Tube Detectors to Hyperon Studies

S. Jowzaeea,b for the COSY-TOF collaboration aInstitute of Physics, Jagiellonian University, St. Łojasiewicza 11, 30-348 Kraków, Poland bJülich Center for Hadron Physics, Forschungszentrum Jülich, 52428 Jülich, Germany

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A high statistics measurement of the p̅p→ pK+Λ reaction was done with the COSY-TOF experiment. The proton beam was polarized up to more than 80%, and its momentum was 2.95 GeV/c. The reconstruction of the pK+Λ events was done only with the straw tube tracker due to the higher spatial resolution of the straw tube tracker compared to other subdetectors. The Dalitz plot of the pK+Λ events was analyzed to understand the reaction mechanism and presented in this paper. The Dalitz plot shows that the COSY-TOF experiment provides complete kinematic coverage of the phase space of this reaction which made it ideal for p̅p → pK+Λ reaction analysis. The influence of different physical effects as pΛ final state interaction, excited nucleon states (N*-resonances) and a coupled channel effect of NΣ-pΛ (NΣ cusp effect) produce significant structures in the Dalitz plot. The angular distribution of the particles in the CMS and helicity frame was also presented in this paper.

DOI: 10.12693/APhysPolA.127.1552 PACS numbers: 14.20.Jn, 13.75.Cs, 29.40.Gx