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26 April 2024

» arxiv » nucl-ex/0501027

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a0+(980)-resonance production in the reaction pp -> dpi+eta close to the K(bar(K)) threshold
P. Fedorets ; M. Buescher ; V.P. Chernyshev ; S. Dymov ; V.Yu. Grishina ; C. Hanhart ; M. Hartmann ; V. Hejny ; V. Kleber ; H.R. Koch ; L.A. Kondratyuk ; V. Koptev ; A.E. Kudryavtsev ; P. Kulessa ; S. Merzliakov ; S. Mikirtychiants ; M. Nekipelov ; H. Ohm ; R. Schleichert ; H. Stroeher ; V.E. Tarasov ; K.-H. Watzlawik ; I. Zychor ;
Date:	28 Dec 2004
Subject:	nucl-ex hep-ph
Abstract:	The reaction pp -> dpi+eta has been measured at a beam energy of T=2.65 GeV (p=3.46 GeV/c) using the ANKE spectrometer at COSY-Juelich. The missing mass distribution of the detected dpi+ pairs exhibits a peak around the eta mass on top of a strong background of multi-pion pp -> dpi+(n(pi)) events. The differential cross section d^4(sigma)/d(Omega_d)d(Omega_pi+)d(p_d)d(p_pi+) for the reaction pp -> dpi+eta has been determined model independently for two regions of phase space. Employing a dynamical model for the a0+ production allows one then to deduce a total cross section of sigma(pp -> da0+ -> dpi+eta)=(1.1 +/- 0.3_(stat) +/- 0.7_(syst)) microbarn for the production of pi+eta via the scalar a0+(980) resonance and sigma(pp -> dpi+eta) = (3.5 +/- 0.3_(stat) +/- 1.0_(syst)) microbarn for the non-resonant production. Using the same model as for the interpretation of recent results from ANKE for the reaction pp -> dK+(bar(K0)), the ratio of the total cross sections is sigma(pp -> d(K+(bar(K0)))_(L=0))/sigma(pp -> da0+ -> dpi+eta) = 0.029 +/- 0.008_(stat) +/- 0.009_(syst), which is in agreement with branching ratios in the literature.
Source:	arXiv, nucl-ex/0501027
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