Dymov, S; Hartmann, M; Kacharava, A; Khoukaz, A; Komarov, V; Kulessa, P; Kulikov, A; ... Zalikhanov, B; + view all Dymov, S; Hartmann, M; Kacharava, A; Khoukaz, A; Komarov, V; Kulessa, P; Kulikov, A; Kurbatov, V; Macharashvili, G; Merzliakov, S; Mielke, M; Mikirtychiants, S; Nekipelov, M; Nioradze, M; Ohm, H; Rathmann, F; Stroher, H; Tsirkov, D; Uzikov, Y; Valdau, Y; Wilkin, C; Yaschenko, S; Zalikhanov, B; - view fewer (2009) Observation of an "ABC" Effect in Proton-Proton Collisions. PHYS REV LETT , 102 (19) , Article 192301. 10.1103/PhysRevLett.102.192301.

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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 quasiparticle is in the S-1(0) state. At the three higher energies, the missing-mass M-X spectra show a strong enhancement at low M-X, corresponding to an Abashian-Booth-Crowe 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 M-X 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. There is no sign of any resonancelike structure in the energy dependence of the type recently observed for the pn -> d pi(0)pi(0) total cross section.

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