Czyzykiewicz R, Moskal P, Adam HH, Budzanowski A, Czerwiński E, Gil D, Grzonka D, Hodana M, Janusz M, Jarczyk L, Kamys B, Khoukaz A, Kilian K, Klaja P, Lorentz B, Oelert W, Piskor-Ignatowicz C, Przerwa J, Rejdych B, Ritman J, Sefzick T, Siemaszko M, Smyrski J, Täschner A, Ulbrich K, Winter P, Wolke M, Wüstner P, Zipper W. Mechanism of near-threshold production of the eta meson.
Phys Rev Lett 2007;
98:122003. [PMID:
17501114 DOI:
10.1103/physrevlett.98.122003]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2006] [Indexed: 05/15/2023]
Abstract
Measurements of the analyzing power for the pp-->pp eta reaction have been performed at excess energies of Q=10 and 36 MeV. The determined analyzing power is essentially consistent with zero, implying dominance of the s wave at both excess energies. The angular dependence of the analyzing power, combined with the isospin dependence of the total cross section for the eta meson production in nucleon-nucleon collisions, reveal that the excitation of the nucleon to the S11(1535) resonance is predominantly due to the exchange of the pi meson between the colliding nucleons.
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