P-wave dominance in the pd -> 3He pi+ pi- reaction near threshold measured with the MOMO experiment at COSY
arXiv (Cornell University)(1998)
摘要
The cross section of the pd -> 3He pi+ pi - reaction has been measured at the
MOMO facility in a kinematically complete experiment at a c. m. excess energy
of Q = 70 MeV. The energy and angular distributions show that the reaction is
dominated by p-wave pi+ pi- pairs. This is in complete contrast to the results
of inclusive measurements at somewhat higher energies which show a strong
s-wave ABC enhancement at low pi pi masses. There are however indications of
p-wave pion pairs from other experiments at low Q.
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关键词
cross section
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