Production of the 1S0 diproton in the pp -> pp pi0 reaction at 0.8 GeV

Details Production of the 1S0 diproton in the pp -> pp pi0 reaction at 0.8 GeV Production of the 1S0 diproton in the pp -> pp pi0 reaction at 0.8 GeV

2005-12-22

arxiv.org/abs/nucl-ex/0512035v1

Phys.Lett.B635:270-274,2006

Physics

Nuclear Physics

Nuclear Experiment

10 pages, 5 eps figures, prepared using elsart.cls

Scientific paper

10.1016/j.physletb.2006.03.012

The pp -> pp pi0 differential cross section has been measured with the ANKE spectrometer at COSY-Juelich for pion cms angles between 0 and 15.4 degrees at a proton beam energy of 0.8 GeV. The selection of diproton pairs with an excitation energy E_{pp} < 3 MeV ensures that the final pp system is dominantly in the spin-singlet 1S0 state. The kinematics are therefore very similar to those of pp -> d pi+ but with different spin and isospin transitions. The results will thus provide a crucial extra test of pion production models in nucleon-nucleon collisions. The cross sections, which are over two orders of magnitude smaller than those of pp -> d pi+, show a forward dip, even stronger than that seen at lower energies. This behaviour is well reproduced in a theoretical model that includes P-wave Delta-N states.

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