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Differential cross section and recoil polarization measurements for the gamma p to K+ Lambda reaction using CLAS at Jefferson Lab

M.E. Mccracken M. Bellis C.A. Meyer M. Williams K.P. Adhikari M. Anghinolfi J. Ball 1 M. Battaglieri B.L. Berman A.S. Biselli D. Branford W.J. Briscoe W.K. Brooks V.D. Burkert S.L. Careccia D.S. Carman P.L. Cole P. Collins V. Crede A. d'Angelo A. Daniel N. Dashyan R. de Vita E. de Sanctis A. Deur B. Dey S. Dhamija R. Dickson C. Djalali D. Doughty M. Dugger R. Dupre A. El Alaoui P. Eugenio S. Fegan A. Fradi 2 M.Y. Gabrielyan K.L. Giovanetti F.X. Girod 1 J.T. Goetz W. Gohn R.W. Gothe K.A. Griffioen M. Guidal 2 K. Hafidi H. Hakobyan C. Hanretty N. Hassall K. Hicks M. Holtrop Y. Ilieva D.G. Ireland H.S. Jo 2 D. Keller M. Khandaker P. Khetarpal W. Kim A. Klein F.J. Klein V. Kubarovsky S.V. Kuleshov V. Kuznetsov K. Livingston M. Mayer J. Mcandrew B. Mckinnon M.D. Mestayer T. Mineeva M. Mirazita V. Mokeev B. Moreno 1 K. Moriya B. Morrison H. Moutarde 1 E. Munevar P. Nadel-Turonski S. Niccolai 2 G. Niculescu I. Niculescu M. Osipenko A.I. Ostrovidov K. Park S. Park E. Pasyuk S. Anefalos Pereira Y. Perrin 3 S. Pisano 2 O. Pogorelko S. Pozdniakov J.W. Price S. Procureur 1 Y. Prok D. Protopopescu B. Quinn B.A. Raue G. Ricco M. Ripani B.G. Ritchie G. Rosner P. Rossi F. Sabatié 1 M.S. Saini J. Salamanca D. Schott R.A. Schumacher E. Seder H. Seraydaryan Y.G. Sharabian D.I. Sober D. Sokhan S.S. Stepanyan P. Stoler S. Strauch M. Taiuti D.J. Tedeschi S. Tkachenko M. Ungaro B. Vernarsky M.F. Vineyard D. Watts E. Voutier 3 L.B. Weinstein D.P. Weygand M.H. Wood L. Zana
Abstract : We present measurements of the differential cross section and Lambda recoil polarization for the gamma p to K+ Lambda reaction made using the CLAS detector at Jefferson Lab. These measurements cover the center-of-mass energy range from 1.62 to 2.84 GeV and a wide range of center-of-mass K+ production angles. Independent analyses were performed using the K+ p pi- and K+ p (missing pi -) final-state topologies; results from these analyses were found to exhibit good agreement. These differential cross section measurements show excellent agreement with previous CLAS and LEPS results and offer increased precision and a 300 MeV increase in energy coverage. The recoil polarization data agree well with previous results and offer a large increase in precision and a 500 MeV extension in energy range. The increased center-of-mass energy range that these data represent will allow for independent study of non-resonant K+ Lambda photoproduction mechanisms at all production angles.
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Submitted on : Tuesday, April 6, 2010 - 12:46:12 PM
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M.E. Mccracken, M. Bellis, C.A. Meyer, M. Williams, K.P. Adhikari, et al.. Differential cross section and recoil polarization measurements for the gamma p to K+ Lambda reaction using CLAS at Jefferson Lab. Physical Review C, American Physical Society, 2010, 81, pp.025201. ⟨10.1103/PhysRevC.81.025201⟩. ⟨in2p3-00470352⟩

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