Maeda Y, Hartmann M, Keshelashvili I, Barsov S, Büscher M, Dzyuba A, Dymov S, Hejny V, Kacharava A, Kleber V, Koch HR, Koptev V, Kulessa P, Mersmann T, Mikirtytchiants S, Mussgiller A, Nekipelov M, Ohm H, Schleichert R, Stein HJ, Ströher H, Valdau Y, Watzlawik KH, Wilkin C, Wüstner P. Precision measurement of the quasifree pn-->dvarphi reaction close to threshold.
Phys Rev Lett 2006;
97:142301. [PMID:
17155243 DOI:
10.1103/physrevlett.97.142301]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2006] [Indexed: 05/12/2023]
Abstract
The quasifree pn-->dvarphi reaction has been studied at the Cooler Synchrotron COSY-Jülich, using the internal proton beam incident on a deuterium cluster-jet target and detecting a fast deuteron in coincidence with the K+K- decay of the varphi meson. The energy dependence of the total and differential cross sections are extracted for excess energies up to 80 MeV by determining the Fermi momentum of the target neutron on an event-by-event basis. Though these cross sections are consistent with s-wave production, the kaon angular distributions show the presence of p waves at quite a low energy. Production on the neutron is found to be stronger than on the proton but not by as much as for the eta meson.
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