/ Experiment-Nucl


Evidence for excitation of two resonance states in the isovector two-baryon system with a mass of 2.2 GeV/ c2


Komarov, V. (Dubna, JINR) ; Tsirkov, D. (Dubna, JINR) ; Azaryan, T. (Dubna, JINR) ; Bagdasarian, Z. (Tbilisi State U.) ; Dymov, S. (Julich, Forschungszentrum) ; Gebel, R. (Julich, Forschungszentrum) ; Gou, B. (Lanzhou, Inst. Modern Phys.) ; Kacharava, A. (Julich, Forschungszentrum) ; Khoukaz, A. (Munster U.) ; Kulikov, A. (Dubna, JINR) ; Kurbatov, V. (Dubna, JINR) ; Lorentz, B. (Julich, Forschungszentrum) ; Macharashvili, G. (Tbilisi State U.) ; Mchedlishvili, D. (Tbilisi State U.) ; Merzliakov, S. (Julich, Forschungszentrum) ; Mikirtytchiants, S. (St. Petersburg, INP) ; Ohm, H. (Julich, Forschungszentrum) ; Papenbrock, M. (Munster U.) ; Rathmann, F. (Julich, Forschungszentrum) ; Serdyuk, V. (Julich, Forschungszentrum) ; Shmakova, V. (Dubna, JINR) ; Ströher, H. (Julich, Forschungszentrum) ; Trusov, S. (SINP, Moscow) ; Uzikov, Yu. (Dubna, JINR) ; Valdau, Yu. (Bonn U., HISKP)

Published in: Phys.Rev.
Year: 2016
Vol.: C93    Num./Issue: 6
Page No: 065206
Pages: 9
Year: 2016-06-17 published

Abstract: We report on measurements of the differential cross section dσ/dΩ and the first measurement of the analyzing power Ay in the Δ(1232) excitation energy region of the reaction pp→{pp}sπ0 where {pp}s is a S01 proton pair. The experiment has been performed with the ANKE spectrometer at COSY-Jülich. The data reveal a peak in the energy dependence of the forward {pp}s differential cross section, a minimum at zero degrees of its angular distribution, and a large analyzing power. The results present a direct manifestation of two two-baryon resonance-like states with JP=2− and 0− and an invariant mass of 2.2GeV/c2.


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Total numbers of views: 630
Numbers of unique views: 236
DOI: 10.1103/PhysRevC.93.065206
 Record created 2016-07-04, last modified 2016-07-04



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