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Observation of an ABC effect in proton-proton collisions | | S. Dymov
; M. Hartmann
; A. Kacharava
; A. Khoukaz
; V. Komarov
; P. Kulessa
; A. Kulikov
; V. Kurbatov
; G. Macharashvili
; S. Merzliakov
; M. Mielke
; S. Mikirtychiants
; M. Nekipelov
; M. Nioradze
; H. Ohm
; F. Rathmann
; H. Ströher
; D. Tsirkov
; Yu. Uzikov
; Yu. Valdau
; C. Wilkin
; S. Yaschenko
; B. Zalikhanov
; | | Date: |
4 Feb 2009 | | Abstract: | The cross section for inclusive multipion production in the pp->ppX reaction
was measured at COSY-ANKE at four beam energies, 0.8, 1.1, 1.4, and 2.0 GeV,
for low excitation energy in the final pp system, such that the diproton
quasi-particle is in the 1S0 state. At the three higher energies the missing
mass Mx spectra show a strong enhancement at low Mx, corresponding to an ABC
effect that moves steadily to larger values as the energy is increased. Despite
the missing-mass structure looking very different at 0.8 GeV, the variation
with Mx and beam energy are consistent with two-pion production being mediated
through the excitation of two Delta(1232) isobars, coupled to S-- and D--
states of the initial pp system. | | Source: | arXiv, 0902.0715 | | Services: | Forum | Review | PDF | Favorites | |
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