Pion-pion p-wave dominance in the pd -> He-3 pi(+)pi(-) reaction near threshold
1999
The cross section for the pd-->He-3 pi(+)pi(-) reaction has been measured in a kinematically complete experiment at a c.m. excess energy of Q = 70 MeV. The striking energy and angular distributions are reproduced in a simple model calculation when it is assumed 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 beam energies which show a strong s-wave ABC enhancement at low pi pi masses. [S0556-2813(99)51111-4].
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