Study of the p p -> p p pi+ pi- Reaction in the Low-Energy Tail of the Roper Resonance

J. Paetzold , M. Bashkanov , R. Bilger , W. Brodowski , H. Calen , H. Clement , C. Ekstrom , K. Fransson

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J. Greiff S. Haggstrom B. Hoistad J. Johanson A. Johansson T. Johansson K. Kilian S. Kullander A. Kupsc P. Marciniewski B. Morosov W. Oelert R.J.M.Y. Ruber M. Schepkin W. Scobel J. Stepaniak A. Sukhanov A. Turowiecki G.J. Wagner Z. Wilhelmi J. Zabierowski J. Zlomanczuk

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keywords reactionropersigmabeenbranchingcarriedcelsiusdata

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Exclusive measurements of the p p -> p p pi+ pi- reaction have been carried out at Tp = 775 MeV at CELSIUS using the PROMICE/WASA setup. Together with data obtained at lower energy they point to a dominance of the Roper excitation in this process. From the observed interference of its decay routes N* -> N sigma and N* -> Delta pi -> N sigma their energy-dependent relative branching ratio is determined.

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Study of the p p -> p p pi+ pi- Reaction in the Low-Energy Tail of the Roper Resonance

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