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

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

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  • Media type: E-Article
  • Title: a0+(980)-resonance production in the reaction pp -> dpi+eta close to the K(bar(K)) threshold
  • Contributor: Fedorets, P. [Author]; Büscher, M. [Author]; Kondratyuk, L. A. [Author]; Koptev, V. [Author]; Kudryavtsev, A. E. [Author]; Kulessa, P. [Author]; Merzliakov, S. [Author]; Mikirtychiants, S. [Author]; Nekipelov, M. [Author]; Ohm, H. [Author]; Schleichert, R. [Author]; Ströher, H. [Author]; Chernyshev, V. P. [Author]; Tarasov, V. E. [Author]; Watzlawik, K.-H. [Author]; Zychor, I. [Author]; Dymov, S. [Author]; Grishina, V. Yu. [Author]; Hanhart, C. [Author]; Hartmann, M. [Author]; Hejny, V. [Author]; Kleber, V. [Author]; Koch, H. R. [Author]
  • imprint: AIP, 2006
  • Published in: Physics of atomic nuclei 69, 306 - 313 (2006). doi:10.1134/S1063778806020153
  • Language: English
  • DOI: https://doi.org/10.1134/S1063778806020153
  • ISSN: 1063-7788
  • Keywords: a0(980): intermediate state ; magnetic spectrometer: experimental results ; a0(980) --> eta pi+ ; differential cross section ; deuteron: hadroproduction ; K anti-K: threshold ; p p --> deuteron eta pi+ ; 3.46 GeV/c ; pi+: hadroproduction ; quark gluon: string model ; Juelich COSY PS ; channel cross section ; mass spectrum: missing-mass ; eta: hadroproduction ; p p: exclusive reaction
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  • Description: 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.
  • Access State: Open Access