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23 April 2024

» arxiv » 1507.0325

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First measurement of the helicity asymmetry E in $eta$ photoproduction on the proton
I. Senderovich ; B.T. Morrison ; M. Dugger ; B.G. Ritchie ; E. Pasyuk ; R. Tucker ; J. Brock ; C. Carlin ; C.D. Keith ; D.G. Meekins ; M.L. Seely ; D. R ; M. D ; P. Collins ; K.P. Adhikari ; D. Adikaram ; Z. Akbar ; M.D. Anderson ; S. Anefalos Pereira ; R.A. Badui ; J. Ball ; N.A. Baltzell ; M. Battaglieri ; V. Batourine ; I. Bedlinskiy ; A.S. Biselli ; S. Boiarinov ; W.J. Briscoe ; W.K. Brooks ; V.D. Burkert ; D.S. Carman ; A. Celentano ; S. Chandavar ; G. Charles ; L. Colaneri ; P.L. Cole ; M. Contalbrigo ; O. Cortes ; V. Crede ; A. D'Angelo ; N. Dashyan ; R. De Vita ; E. De Sanctis ; A. Deur ; C. Djalali ; R. Dupre ; H. Egiyan ; A. El Alaoui ; L. El Fassi ; A. Fradi ; L. Elouadrhiri ; P. Eugenio ; G. Fedotov ; S. Fegan ; A. Filippi ; J.A. Fleming ; B. Garillon ; Y. Ghandilyan ; G.P. Gilfoyle ; K.L. Giovanetti ; F.-X. Girod ; D.I. Glazier ; J.T. Goetz ; W. Gohn ; E. Golovatch ; R.W. Gothe ; K.A. Griffioen ; M. Guidal ; L. Guo ; K. Hafidi ; H. Hakobyan ; C. Hanretty ; M. Hattawy ; K. Hicks ; D. Ho ; M. Holtrop ; S.M. Hughes ; Y. Ilieva ; D.G. Ireland ; B.S. Ishkhanov ; D. Jenkins ; H. Jiang ; H.S. Jo ; K. Joo ; S. Joosten ; D. Keller ; G. Khachatryan ; M. Khandaker ; A. Kim ; F.J. Klein ; V. Kubarovsky ; M.C. Kunkel ; P. Lenisa ; K. Livingston ; H.Y. Lu ; I.J.D. MacGregor ; P. Mattione ; B. McKinnon ; C.A. Meyer ; T. Mineeva ; V. Mokeev ; R.A. Montgomery ; A. Movsisyan ; C. Munoz Camacho ; P. Nadel-Turonski ; L.A. Net ; S. Niccolai ; G. Niculescu ; I. Niculescu ; M. Osipenko ; K. Park ; S. Park ; P. Peng ; W. Phelps ; S. Pisano ; O. Pogorelko ; J.W. Price ; Y. Prok ; A.J.R. Puckett ; M. Ripani ; A. Rizzo ; G. Rosner ; P. Roy ; F. Sabatie ; C. Salgado ; D. Schott ; R.A. Schumacher ; E. Seder ; A. Simonyan ; Iu. Skorodumina ; G.D. Smith ; D.I. Sober ; D. Sokhan ; N. Sparveris ; S. Stepanyan ; P. Stoler ; I.I. Strakovsky ; S. Strauch ; V. Sytnik ; Ye Tian ; M. Ungaro ; H. Voskanyan ; E. Voutier ; N.K. Walford ; X. Wei ; M.H. Wood ; N. Zachariou ; L. Zana ; J. Zhang ; Z.W. Zhao ; I. Zonta ;
Date:	1 Jul 2015
Abstract:	Results are presented for the first measurement of the double-polarization helicity asymmetry E for the $eta$ photoproduction reaction $gamma p ightarrow eta p$. Data were obtained using the FROzen Spin Target (FROST) with the CLAS spectrometer in Hall B at Jefferson Lab, covering a range of center-of-mass energy W from threshold to 2.15 GeV and a large range in center-of-mass polar angle. As an initial application of these data, the results have been incorporated into the J"ulich model to examine the case for the existence of a narrow $N^*$ resonance between 1.66 and 1.70 GeV. The addition of these data to the world database results in marked changes in the predictions for the E observable using that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances.
Source:	arXiv, 1507.0325
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