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Experimental study of the P11(1440) and D13(1520) resonances from the CLAS data on ep→e′π+π−p′

V.I. Mokeev V.D. Burkert L. Elouadrhiri G.V. Fedotov E.N. Golovatch R.W. Gothe B.S. Ishkhanov E.L. Isupov K.P. Adhikari M. Aghasyan M. Anghinolfi H. Avakian H. Baghdasaryan J. Ball 1 N.A. Baltzell M. Battaglieri V. Batourine I. Bedlinskiy A.S. Biselli C. Bookwalter S. Boiarinov W.J. Briscoe W.K. Brooks D.S. Carman A. Celentano G. Charles 1 P.L. Cole M. Contalbrigo V. Crede A. d'Angelo A. Daniel N. Dashyan R. de Vita E. de Sanctis A. Deur C. Djalali D. Doughty R. Dupre A. El Alaoui P. Eugenio S. Fegan A. Fradi K.L. Giovanetti F.X. Girod W. Gohn L. Graham K.A. Griffioen B. Guegan 2 M. Guidal 2 L. Guo K. Hafidi H. Hakobyan C. Hanretty K. Hicks D. Ho M. Holtrop Y. Ilieva D.G. Ireland H.S. Jo K. Joo D. Keller M. Khandaker P. Khetarpal A. Kim W. Kim A. Klein F.J. Klein S. Koirala A. Kubarovsky V. Kubarovsky S.V. Kuleshov N.D. Kvaltine K. Livingston H.Y. Lu I.J.D. Macgregor Y. Mao N. Markov David Martinez M. Mayer B. Mckinnon C.A. Meyer T. Mineeva M. Mirazita H. Moutarde 1 E. Munevar P. Nadel-Turonski C.S. Nepali A.I. Ostrovidov L.L. Pappalardo R. Paremuzyan K. Park S. Park E. Pasyuk S. Anefalos Pereira S. Pisano O. Pogorelko S. Pozdniakov J.W. Price S. Procureur 1 D. Protopopescu B.A. Raue G. Ricco D. Rimal M. Ripani G. Rosner P. Rossi F. Sabatié 1 M.S. Saini C. Salgado D. Schott R.A. Schumacher E. Seder H. Seraydaryan Y.G. Sharabian G.D. Smith L.C. Smith D.I. Sober D. Sokhan S. Stepanyan S.S. Stepanyan P. Stoler I.I. Strakovsky S. Strauch W. Tang C.E. Taylor Ye Tian S. Tkachenko A. Trivedi M. Ungaro M.F. Vineyard H. Voskanyan E. Voutier 3 N.K. Walford M.H. Wood N. Zachariou Z.W. Zhao I. Zonta
Abstract : The transition helicity amplitudes from the proton ground state to the $P_{11}(1440)$ and $D_{13}(1520)$ excited states ($\gamma_{v}pN^*$ electrocouplings) were determined from the analysis of nine independent one-fold differential $\pi^{+} \pi^{-} p$ electroproduction cross sections off a proton target, taken with CLAS at photon virtualities 0.25\enskip {\rm GeV$^{2}$} $<$ $Q^{2}$ $<$ 0.60 \enskip {\rm GeV$^{2}$}. The phenomenological reaction model was employed for separation of the resonant and non-resonant contributions to the final state. The $P_{11}(1440)$ and $D_{13}(1520)$ electrocouplings were obtained from the resonant amplitudes parametrized within the framework of a unitarized Breit-Wigner ansatz. They are consistent with results obtained in the previous CLAS analyses of the $\pi^+n$ and $\pi^0p$ channels. The successful description of a large body of data in dominant meson-electroproduction channels off protons with the same $\gamma_{v}pN^*$ electrocouplings offers clear evidence for the reliable extraction of these fundamental quantities from meson-electroproduction data. This analysis also led to the determination of the long-awaited hadronic branching ratios for the $D_{13}(1520)$ decay into $\Delta\pi$ (24%-32%) and $N\rho$ (8%-17%).
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V.I. Mokeev, V.D. Burkert, L. Elouadrhiri, G.V. Fedotov, E.N. Golovatch, et al.. Experimental study of the P11(1440) and D13(1520) resonances from the CLAS data on ep→e′π+π−p′. Physical Review C, American Physical Society, 2012, 86, pp.035203. ⟨10.1103/PhysRevC.86.035203⟩. ⟨in2p3-00732442⟩

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