Evidence for a 'Narrow' Roper Resonance - the Breathing Mode of the Nucleon

Simple item page
dc.creatorClement, H.
dc.creatorSkorodko, T.
dc.creatorBashkanov, M.
dc.creatorBogoslawsky, D.
dc.creatorCalen, H.
dc.creatorCappellaro, F.
dc.creatorDemiroers, L.
dc.creatorDoroshkevich, E.
dc.creatorEkstrom, C.
dc.creatorFransson, K.
dc.creatorHoistad, L. Gustafsson. B.
dc.creatorIvanov, G.
dc.creatorJacewicz, l M.
dc.creatorJiganov, E.
dc.creatorJohansson, T.
dc.creatorKaskulov, M.
dc.creatorKhakimova, O.
dc.creatorKeleta, S.
dc.creatorKoch, I.
dc.creatorKren, F.
dc.creatorKullander, S.
dc.creatorKupsc, A.
dc.creatorKuznetsov, A.
dc.creatorMarciniewski, P.
dc.creatorMartemyanov, B.
dc.creatorMeier, R.
dc.creatorMorosov, B.
dc.creatorOelert, W.
dc.creatorPauly, C.
dc.creatorPettersson, H.
dc.creatorPetukhov, Y.
dc.creatorPovtorejko, A.
dc.creatorRuber, R. J. M. Y.
dc.creatorSchonning, K.
dc.creatorScobel, W.
dc.creatorShwartz, B.
dc.creatorSopov, V.
dc.creatorStepaniak, J.
dc.creatorThorngren-Engholm, P.
dc.creatorTikhomirov, V.
dc.creatorTurowiecki, A.
dc.creatorWagner, G. J.
dc.creatorWolke, M.
dc.creatorYamamoto, A.
dc.creatorZabierowski, J.
dc.creatorZlomanczuk, J.
dc.date2006-12-11
dc.date.accessioned2026-07-07T07:34:54Z
dc.date.available2026-07-07T07:34:54Z
dc.descriptionAll 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 $π$N or $γ$N reactions. Only in partial wave analyses of $π$N scattering data a clear resonance strcuture gets obvious in the $P_{11}$ partial wave. Very recent measurements of the J/$Ψ$ decay by the BES collaboration and of the $pp \to npπ^+$ reaction at 1.3 GeV by the CELSIUS-WASA collaboration show for the first time a clear resonance structure in the invariant $nπ^+$ 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 $π$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$^* \to $N$σ$, i.e. a monopole transition as expected for the breathing mode of the nucleon.
dc.descriptionCRIMEA06
dc.identifierhttps://arxiv.org/abs/nucl-ex/0612015
dc.identifierhttp://arxiv.org/abs/nucl-ex/0612015
dc.identifierProc. CRIMEA06 Int. Conf. "New trends in High Energy Physics", Yalta, Crimea 2006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/119933
dc.subjectNuclear Experiment
dc.titleEvidence for a 'Narrow' Roper Resonance - the Breathing Mode of the Nucleon
dc.typetext

Files

Collections

arXiv