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27 April 2024

» arxiv » 1306.5130

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Measurement of the $pn o pppi^0pi^-$ Reaction in Search for the Recently Observed Resonance Structure in $dpi^0pi^0$ and $dpi^+pi^-$ systems
P.Adlarson ; W.Augustyniak ; W.Bardan ; M.Bashkanov ; F.S.Bergmann ; M.Berłowski ; H.Bhatt ; M.Büscher ; H.Calén ; I.Ciepał ; H. Clement ; D.Coderre ; E.Czerwiński ; K.Demmich ; E.Doroshkevich ; R.Engels ; W.Erven ; W.Eyrich ; P.Fedorets ; K.Föhl ; K.Fransson ; F.Goldenbaum ; P.Goslawski ; A.Goswami ; K.Grigoryev ; C.--O.Gullström ; F.Hauenstein ; L.Heijkenskjöld ; V.Hejny ; F.Hinterberger ; M.Hodana ; B.Höistad ; A.Jany ; B.R.Jany ; L.Jarczyk ; T.Johansson ; B.Kamys ; G.Kemmerling ; F.A.Khan ; A.Khoukaz ; D.A.Kirillov ; S.Kistryn ; J.Klaja ; H.Kleines ; B.Kłos ; M.Krapp ; W.Krzemień ; P.Kulessa ; A.Kupść ; K.Lalwani ; D.Lersch ; L.Li ; B.Lorentz ; A.Magiera ; R.Maier ; P.Marciniewski ; B.Mariański ; M.Mikirtychiants ; H.--P.Morsch ; P.Moskal ; B.K.Nandi ; H.Ohm ; I.Ozerianska ; E.Perez del Rio ; N.M.Piskunov ; P.Pluciński ; P.Podkopał ; D.Prasuhn ; A.Pricking ; D.Pszczel ; K.Pysz ; A.Pyszniak ; C.F.Redmer ; J.Ritman ; A.Roy ; Z.Rudy ; S.Sawant ; A.Schmidt ; S.Schadmand ; T.Sefzick ; V.Serdyuk ; N.Shah ; M.Siemaszko ; R.Siudak ; T.Skorodko ; M.Skurzok ; J.Smyrski ; V.Sopov ; R.Stassen ; J.Stepaniak ; E.Stephan ; G.Sterzenbach ; H.Stockhorst ; H.Ströher ; A.Szczurek ; T.Tolba ; A.Trzciński ; R.Varma ; G.J.Wagner ; W.Węglorz ; M.Wolke ; A.Wro{ń}ska ; P.Wüstner ; P.Wurm ; A.Yamamoto ; X.Yuan ; J.Zabierowski ; C.Zheng ; M.J.Zieliński ; W.Zipper ; J.Złomańczuk ; P.{Ż}uprański ; M.{Ż}urek ;
Date:	21 Jun 2013
Abstract:	Exclusive measurements of the quasi-free $pn o pppi^0pi^-$ reaction have been performed by means of $pd$ collisions at $T_p$ = 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region $sqrt s$ = (2.35 - 2.46) GeV, which includes the region of the ABC effect and its associated resonance structure. No ABC effect, {it i.e.} low-mass enhancement is found in the $pi^0pi^-$-invariant mass spectrum -- in agreement with the constraint from Bose statistics that the isovector pion pair can not be in relative s-wave. At the upper end of the covered energy region $t$-channel processes for Roper, $Delta(1600)$ and $DeltaDelta$ excitations provide a reasonable description of the data, but at low energies the measured cross sections are much larger than predicted by such processes. Adding a resonance amplitude for the resonance at $m$=~2.37 GeV with $Gamma$ =~70 MeV and $I(J^P)=~0(3^+)$ observed recently in $pn o dpi^0pi^0$ and $pn o dpi^+pi^-$ reactions leads to an agreement with the data also at low energies.
Source:	arXiv, 1306.5130
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