Electroproduction of $\phi(1020)$ Mesons at High $Q^2$ with CLAS

J. P. Santoro E. S. Smith M. Garçon 1 M. Guidal 2 J. M. Laget C. Weiss G. Adams M.J. Amaryan M. Anghinolfi G. Asryan G. Audit 1 H. Avakian H. Bagdasaryan N. Baillie J. Ball J.P. Ball N.A. Baltzell S. Barrow M. Battaglieri I. Bedlinskiy M. Bektasoglu M. Bellis N. Benmouna B.L. Berman A.S. Biselli L. Blaszczyk B.E. Bonner C. Bookwalter S. Bouchigny 2 S. Boiarinov R. Bradford D. Branford W.J. Briscoe W.K. Brooks S. B¨ultmann V.D. Burkert C. Butuceanu J.R. Calarco S.L. Careccia D.S. Carman L. Casey A. Cazes S. Chen L. Cheng P.L. Cole P. Collins P. Coltharp D. Cords P. Corvisiero D. Crabb H. Crannell V. Crede J.P. Cummings D. Dale N. Dashyan R. De Masi 1 E. De Sanctis R. De Vita P.V. Degtyarenko H. Denizli L. Dennis A. Deur S. Dhamija K.V. Dharmawardane K.S. Dhuga R. Dickson C. Djalali G.E. Dodge D. Doughty M. Dugger S. Dytman O.P. Dzyubak H. Egiyan K.S. Egiyan L. El Fassi L. Elouadrhiri P. Eugenio R. Fatemi G. Fedotov R.J. Feuerbach J. Ficenec T.A. Forest A. Fradi 2 H. Funsten G. Gavalian N. Gevorgyan G.P. Gilfoyle K.L. Giovanetti F.X. Girod 1 J.T. Goetz W. Gohn C.I.O. Gordon R.W. Gothe L. Graham K.A. Griffioen M. Guillo N. Guler L. Guo V. Gyurjyan C. Hadjidakis 2 K. Hafidi H. Hakobyan C. Hanretty J. Hardie N. Hassall D. Heddle § F.W. Hersman K. Hicks I. Hleiqawi M. Holtrop C.E. Hyde-Wright Y. Ilieva D.G. Ireland B.S. Ishkhanov E.L. Isupov M.M. Ito D. Jenkins H.S. Jo 2 J.R. Johnstone K. Joo H.G. Juengst N. Kalantarians D. Keller J.D. Kellie M. Khandaker W. Kim A. Klein F.J. Klein A.V. Klimenko M. Kossov Z. Krahn L.H. Kramer V. Kubarovsky J. Kuhn S.E. Kuhn S.V. Kuleshov V. Kuznetsov J. Lachniet J. Langheinrich D. Lawrence Ji Li K. Livingston H.Y. Lu M. MacCormick 2 C. Marchand 1 N. Markov P. Mattione S. McAleer B. Mckinnon J.W.C. McNabb B.A. Mecking S. Mehrabyan J.J. Melone M.D. Mestayer C.A. Meyer T. Mibe K. Mikhailov R. Minehart M. Mirazita R. Miskimen V. Mokeev L. Morand B. Moreno 2 K. Moriya S.A. Morrow 1, 2 M. Moteabbed J. Mueller E. Munevar G.S. Mutchler P. Nadel-Turonski R. Nasseripour S. Niccolai 2 G. Niculescu I. Niculescu B.B. Niczyporuk M.R. Niroula R.A. Niyazov M. Nozar G.V. O'Rielly M. Osipenko A.I. Ostrovidov K. Park S. Park E. Pasyuk C. Paterson S. Anefalos Pereira S.A. Philips J. Pierce N. Pivnyuk D. Pocanic O. Pogorelko I. Popa S. Pozdniakov B.M. Preedom J.W. Price S. Procureur 1 Y. Prok D. Protopopescu L.M. Qin B.A. Raue G. Riccardi G. Ricco M. Ripani B.G. Ritchie G. Rosner P. Rossi F. Sabatié 1 M.S. Saini J. Salamanca C. Salgado V. Sapunenko D. Schott R.A. Schumacher V.S. Serov Y.G. Sharabian D. Sharov N.V. Shvedunov A.V. Skabelin L.C. Smith D.I. Sober D. Sokhan A. Stavinsky S.S. Stepanyan S. Stepanyan B.E. Stokes P. Stoler I.I. Strakovsky S. Strauch M. Taiuti D.J. Tedeschi A. Tkabladze S. Tkachenko L. Todor C. Tur M. Ungaro M.F. Vineyard A.V. Vlassov D.P. Watts L.B. Weinstein D.P. Weygand M. Williams E. Wolin M.H. Wood A. Yegneswaran M. Yurov L. Zana J. Zhang B. Zhao Z.W. Zhao
Abstract : Electroproduction of exclusive $\phi$ vector mesons has been studied with the CLAS detector in the kinematical range $1.6\leq Q^2\leq 3.8$ GeV$^{2}$, $0.0\leq t^{\prime}\leq 3.6$ GeV$^{2}$, and $2.0\leq W\leq 3.0$ GeV. The scaling exponent for the total cross section as $1/(Q^2+M_{\phi}^2)^n$ was determined to be $n=2.49\pm 0.33$. The slope of the four-momentum transfer $t'$ distribution is $b_{\phi}=0.98 \pm 0.17$ GeV$^{-2}$. The data are consistent with the assumption of s-channel helicity conservation (SCHC). Under this assumption, we determine the ratio of longitudinal to transverse cross sections to be $R=0.86 \pm 0.24$. A 2-gluon exchange model is able to reproduce the main features of the data.
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  • ARXIV : 0803.3537

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J. P. Santoro, E. S. Smith, M. Garçon, M. Guidal, J. M. Laget, et al.. Electroproduction of $\phi(1020)$ Mesons at High $Q^2$ with CLAS. To be submitted to Phys Rev C, 15 pages, 18 figures. 2008. <in2p3-00268880>

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