Physics Letters B (Aug 2017)

Differential cross sections and polarization observables from CLAS K⁎ photoproduction and the search for new N⁎ states

  • A.V. Anisovich,
  • K. Hicks,
  • E. Klempt,
  • V.A. Nikonov,
  • A. Sarantsev,
  • W. Tang,
  • D. Adikaram,
  • Z. Akbar,
  • M.J. Amaryan,
  • S. Anefalos Pereira,
  • R.A. Badui,
  • J. Ball,
  • M. Battaglieri,
  • V. Batourine,
  • I. Bedlinskiy,
  • A.S. Biselli,
  • W.J. Briscoe,
  • V.D. Burkert,
  • D.S. Carman,
  • A. Celentano,
  • S. Chandavar,
  • T. Chetry,
  • G. Ciullo,
  • L. Clark,
  • P.L. Cole,
  • N. Compton,
  • M. Contalbrigo,
  • V. Crede,
  • A. D'Angelo,
  • N. Dashyan,
  • R. De Vita,
  • E. De Sanctis,
  • A. Deur,
  • C. Djalali,
  • M. Dugger,
  • R. Dupre,
  • H. Egiyan,
  • A. El Alaoui,
  • L. El Fassi,
  • P. Eugenio,
  • E. Fanchini,
  • G. Fedotov,
  • A. Filippi,
  • J.A. Fleming,
  • N. Gevorgyan,
  • Y. Ghandilyan,
  • K.L. Giovanetti,
  • F.X. Girod,
  • C. Gleason,
  • R.W. Gothe,
  • K.A. Griffioen,
  • L. Guo,
  • C. Hanretty,
  • N. Harrison,
  • M. Hattawy,
  • M. Holtrop,
  • S.M. Hughes,
  • Y. Ilieva,
  • D.G. Ireland,
  • B.S. Ishkhanov,
  • E.L. Isupov,
  • D. Jenkins,
  • H. Jiang,
  • H.S. Jo,
  • S. Joosten,
  • D. Keller,
  • G. Khachatryan,
  • M. Khandaker,
  • W. Kim,
  • F.J. Klein,
  • V. Kubarovsky,
  • L. Lanza,
  • P. Lenisa,
  • K. Livingston,
  • I.J.D. MacGregor,
  • N. Markov,
  • B. McKinnon,
  • C.A. Meyer,
  • M. Mirazita,
  • V. Mokeev,
  • R.A. Montgomery,
  • A. Movsisyan,
  • E. Munevar,
  • C. Munoz Camacho,
  • G. Murdoch,
  • P. Nadel-Turonski,
  • L.A. Net,
  • A. Ni,
  • S. Niccolai,
  • I. Niculescu,
  • M. Osipenko,
  • A.I. Ostrovidov,
  • M. Paolone,
  • R. Paremuzyan,
  • K. Park,
  • E. Pasyuk,
  • P. Peng,
  • W. Phelps,
  • S. Pisano,
  • O. Pogorelko,
  • J.W. Price,
  • Y. Prok,
  • A.J.R. Puckett,
  • B.A. Raue,
  • M. Ripani,
  • B.G. Ritchie,
  • G. Rosner,
  • P. Roy,
  • F. Sabatié,
  • R.A. Schumacher,
  • Y.G. Sharabian,
  • Iu. Skorodumina,
  • G.D. Smith,
  • D. Sokhan,
  • N. Sparveris,
  • I. Stankovic,
  • S. Stepanyan,
  • S. Strauch,
  • V. Sytnik,
  • Ye. Tian,
  • M. Ungaro,
  • H. Voskanyan,
  • E. Voutier,
  • N.K. Walford,
  • D.P. Watts,
  • M.H. Wood,
  • N. Zachariou,
  • J. Zhang,
  • I. Zonta

Journal volume & issue
Vol. 771
pp. 142 – 150

Abstract

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The reaction γp→K⁎+Λ was measured using the CLAS detector for photon energies between the threshold and 3.9 GeV at the Thomas Jefferson National Accelerator Facility. For the first time, spin-density matrix elements have been extracted for this reaction. Differential cross sections, spin density matrix elements, and the Λ recoil polarization are compared with theoretical predictions using the BnGa partial wave analysis. The main result is the evidence for significant contributions from N(1895)1/2− and N(2100)1/2+ to the reaction. Branching ratios for decays into K⁎Λ for these resonances and further resonances are reported. Keywords: Baryon spectroscopy, Meson photoproduction, Polarization observables