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@ARTICLE{Zielinski:19480,
      author       = {Zielinski, M. J. and Moskal, P. and Kupsc, A.},
      title        = {{R}eaction pp $-\>$ pp pi pi pi as a background for
                      hadronic decays of the eta ' meson},
      journal      = {The European physical journal / A},
      volume       = {47},
      issn         = {1434-6001},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {PreJuSER-19480},
      pages        = {93},
      year         = {2011},
      note         = {The work was partially supported by the European Commission
                      through the Research Infrastructures action of the
                      Capacities Program. Call: FP7-INFRASTRUCTURES-2008-1, Grant
                      Agreement No. 227431, by the PrimeNet, by the FFE grants
                      from the Research Center Julich, by the MPD programme of the
                      Foundation for Polish Science through structural funds of
                      the European Union and by the DOCTUS programme of
                      Malopolskie Centre of Entrepreneurship through structural
                      funds of the European Union.},
      abstract     = {Isospin violating hadronic decays of the eta and eta '
                      mesons into 3 pi mesons are driven by a term in the QCD
                      Lagrangian proportional to the mass difference of the d and
                      u quarks. The source giving large yield of the mesons for
                      such decay studies are pp interactions close to the
                      respective kinematical thresholds. The most important
                      physics background for eta, eta ' -> pi pi pi is coming from
                      direct three-pion production reactions. In case of the eta
                      meson the background for the decays is relatively low
                      (approximate to $10\%).$ The purpose of this article is to
                      provide an estimate of the direct pion production background
                      for the eta ' -> 3 pi decays. Using the inclusive data from
                      the COSY-11 experiment we have extracted the differential
                      cross-section for the pp -> pp-multipion production
                      reactions with the invariant mass of the pions equal to the
                      eta ' meson mass and estimated an upper limit for the signal
                      to background ratio for studies of the eta ' ->
                      pi(+)pi(-)pi(0)decay.},
      keywords     = {background: upper limit (INSPIRE) / eta(958): rare decay
                      (INSPIRE) / pi: multiple production (INSPIRE) / isospin:
                      violation (INSPIRE) / differential cross section (INSPIRE) /
                      missing-mass (INSPIRE) / kinematics (INSPIRE) / COSY-11
                      (INSPIRE) / p p: inelastic scattering (INSPIRE) / eta:
                      hadroproduction (INSPIRE) / threshold (INSPIRE) / mass
                      spectrum: (3pi) (INSPIRE) / channel cross section: energy
                      dependence (INSPIRE) / experimental results (INSPIRE) /
                      Juelich COSY PS (INSPIRE) / p p --> 2p anything (INSPIRE) /
                      p p --> 2p pi+ pi- pi0 (INSPIRE) / eta --> pi+ pi- pi0
                      (INSPIRE)},
      cin          = {IKP-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IKP-1-20111104},
      pnm          = {Physik der Hadronen und Kerne / HADRONPHYSICS2 - Study of
                      Strongly Interacting Matter (227431)},
      pid          = {G:(DE-Juel1)FUEK413 / G:(EU-Grant)227431},
      shelfmark    = {Physics, Nuclear / Physics, Particles $\&$ Fields /
                      13.60.Le / 13.75.-n / 13.85.Lg / 25.40.-h / 29.20.Dh},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000295170900010},
      eprint       = {1107.4278},
      howpublished = {arXiv:1107.4278},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1107.4278;\%\%$},
      doi          = {10.1140/epja/i2011-11093-4},
      url          = {https://juser.fz-juelich.de/record/19480},
}