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23 April 2024

» arxiv » nucl-ex/0612015

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Evidence for a 'Narrow' Roper Resonance - the Breathing Mode of the Nucleon
H. Clement ; T. Skorodko ; M. Bashkanov ; D. Bogoslawsky ; H. Calen ; F. Cappellaro ; L. Demiroers ; E. Doroshkevich ; C. Ekstrom ; K. Fransson ; L. Gustafsson. B. Hoistad ; G. Ivanov ; l M. Jacewicz ; E. Jiganov ; T. Johansson ; M. Kaskulov ; O. Khakimova ; S. Keleta ; I. Koch ; F. Kren ; S. Kullander ; A. Kupsc ; A. Kuznetsov ; P. Marciniewski ; B. Martemyanov ; R. Meier ; B. Morosov ; W. Oelert ; C. Pauly ; H. Pettersson ; Y. Petukhov ; A. Povtorejko ; R. J. M. Y. Ruber ; K. Schonning ; W. Scobel ; B. Shwartz ; V. Sopov ; J. Stepaniak ; P. Thorngren-Engholm ; V. Tikhomirov ; A. Turowiecki ; G. J. Wagner ; M. Wolke ; A. Yamamoto ; J. Zabierowski ; J. Zlomanczuk ;
Date:	11 Dec 2006
Journal:	Proc. CRIMEA06 Int. Conf. "New trends in High Energy Physics", Yalta, Crimea 2006
Abstract:	All the time since its discovery the N$^$(1440) baryon state, commonly known as Roper resonance, has been a state with many question marks - despite of its 4-star ranking in the particle data book. One reason is that it does not produce any explicit resonance-like structures in the observables of $pi$N or $gamma$N reactions. Only in partial wave analyses of $pi$N scattering data a clear resonance strcuture gets obvious in the $P_{11}$ partial wave. Very recent measurements of the J/$Psi$ decay by the BES collaboration and of the $pp o nppi^+$ reaction at 1.3 GeV by the CELSIUS-WASA collaboration show for the first time a clear resonance structure in the invariant $npi^+$ mass spectrum for the Roper resonance at M $approx$ 1360 MeV with a width of about 150 MeV. These values agree very favorably with the pole position results of recent $pi$N phase shift analyses. In consequence of this very low-lying pole postion, which is roughly 100 MeV below the nominal value, the decay properties have to be reinvestigated. From our two-pion production data we see that the decay mainly proceeds via N$^ o $N$sigma$, i.e. a monopole transition as expected for the breathing mode of the nucleon.
Source:	arXiv, nucl-ex/0612015
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