a0+(980)-resonance production in the reaction pp -&gt; dpi+eta close to the K(bar(K)) threshold

Fedorets, P.; Kondratyuk, L. A.; Kleber, V.; Grishina, V. Yu.; Chernyshev, V. P.; Ströher, H.; Hejny, V.; Kulessa, P.; Watzlawik, K.-H.; Koch, H. R.; Nekipelov, M.; Dymov, S.; Mikirtychiants, S.; Hartmann, M.; Merzliakov, S.; Büscher, M.; Kudryavtsev, A. E.; Tarasov, V. E.; Koptev, V.; Schleichert, R.; Hanhart, C.; Zychor, I.; Ohm, H.

doi:10.1134/S1063778806020153

Journal Article

a0+(980)-resonance production in the reaction pp -> dpi+eta close to the K(bar(K)) threshold

Fedorets, P. ; Büscher, M.FZJ* ; Chernyshev, V. P. ; Dymov, S. ; Grishina, V. Y. ; Hanhart, C.FZJ* ; Hartmann, M.FZJ* ; Hejny, V.FZJ* ; Kleber, V. ; Koch, H. R.FZJ* ; Kondratyuk, L. A. ; Koptev, V. ; Kudryavtsev, A. E. ; Kulessa, P. ; Merzliakov, S. ; Mikirtychiants, S. ; Nekipelov, M.FZJ* ; Ohm, H.FZJ* ; Schleichert, R.FZJ* ; Ströher, H.FZJ* ; Tarasov, V. E. ; Watzlawik, K.-H.FZJ* ; Zychor, I.

2006
AIP New York, NY

Physics of atomic nuclei 69, 306 - 313 (2006) [10.1134/S1063778806020153]

This record in other databases:

Please use a persistent id in citations: http://hdl.handle.net/2128/10637 doi:10.1134/S1063778806020153

Abstract: The reaction pp --> d pi(+) eta has been measured at a beam energry of T-p = 2.65 GeV (p(p) = 3.46 GeV/c) using the ANKE spectrometer at COSY-Julich. The missing-mass distribution of the detected d pi(+) pairs exhibits a peak around the eta mass on top of a strong background of multipion pp --> d pi(+) (n pi) events. The differential cross section d(4) sigma/d Omega(d)d Omega(pi+)dp(d)dp(pi+) for the reaction pp --> d pi(+)eta has been determined model independently for two regions of phase space. Employing a dynamical model for the a(0)(+) production allows one then to deduce a total cross section of sigma(pp; --> da(0)(+) --> d pi(+) eta) = 1.1 +/- 0.3(stat) +/- 0.7(syst) mu b for the production of pi(+)eta via the scalar a(0)(+)(980) resonance and sigma(pp --> d pi(+)eta) = 3.5 +/- 0.3(stat) +/- 1.0(syst) mu b for the nonresonant production. Using the same model as for the interpretation of recent results from ANKE for the reaction pp --> dK(+)(K) over bar (0), the ratio of the total cross sections is sigma(pp --> d(K+(K) over bar (0))(L=0))/sigma(pp --> da(0)(+) --> d pi(+)eta) = 0.029 +/- 0.008(stat) +/- 0.009(syst), which is in agreement with branching ratios in the literature.

Keyword(s): p p: exclusive reaction ; pi+: hadroproduction ; eta: hadroproduction ; deuteron: hadroproduction ; a0(980): intermediate state ; differential cross section ; quark gluon: string model ; mass spectrum: missing-mass ; K anti-K: threshold ; channel cross section ; magnetic spectrometer: experimental results ; Juelich COSY PS ; p p --> deuteron eta pi+ ; a0(980) --> eta pi+ ; 3.46 GeV/c