Measurement of the reaction γp→φp in deep inelastic e+p scattering at HERA
M. DerrickUniversity andD. KrakauerUniversity andS. MagillArgonne National Laboratory , Argonne , IL , USAD. MikunasNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)B. MusgraveArgonne National Laboratory , Argonne , IL , USAJ.R. OkrasińskiArgonne National Laboratory , Argonne , IL , USAJ. RepondArgonne National Laboratory , Argonne , IL , USAR. StanekArgonne National Laboratory , Argonne , IL , USAR. L. TalagaArgonne National Laboratory , Argonne , IL , USAH. ZhangArgonne National Laboratory , Argonne , IL , USAM.C.K. MattinglyAndrews University, Berrien Springs, MI, USAG. BariUniversity andM. BasileUniversity andL. BellagambaUniversity andD. BoscheriniNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)A. BruniAndrews University , Berrien Springs , MI , USAG. BruniAndrews University , Berrien Springs , MI , USAP. BruniINFN Bologna , Bologna , ItalyG. Cara RomeoUniversity andG. CastelliniUniversity andL. CifarelliUniversity andF. CindoloNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)A. ContinINFN Bologna , Bologna , ItalyM. CorradiINFN Bologna , Bologna , ItalyI. GialasNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)P. GiustiUniversity andG. IacobucciUniversity andG. LaurentiUniversity andG. LéviNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)A. MargottiINFN Bologna , Bologna , ItalyT. MassamNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)R. NaniaINFN Bologna , Bologna , ItalyF. PalmonariNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)A. PoliniG. SartorelliUniversity andY. Zamora GarciaINFN Bologna , Bologna , ItalyA. ZichichiINFN Bologna , Bologna , ItalyChristoph AmelungUniversity andA. BornheimJ. CrittendenUniversity andR. DeffnerNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)T. DoekerNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)M. EckertNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)L. FeldNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)A. FreyM. GeertsUniversity andM. GrotheUniversity andH. HartmannUniversity andK. HeinlothNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)L. HeinzNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)E. HilgerINFN Bologna , Bologna , ItalyH.‐P. JakobU. KatzS. MengelUniversity andE. PaulPhysikalisches Institut der Universitiit Bonn , Bonn , GermanyMark PfeifferPhysikalisches Institut der Universitiit Bonn , Bonn , GermanyCh. RembserNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)D. SchrammNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)J. StammUniversity andR. WedemeyerNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)S. Campbell-RobsonUniversity andA. CassidyW. N. CottinghamPhysikalisches Institut der Universitiit Bonn , Bonn , GermanyN. DycePhysics Laboratory , University of Bristol , Bristol , UKB. FosterPhysics Laboratory , University of Bristol , Bristol , UKS. GeorgePhysics Laboratory , University of Bristol , Bristol , UKM.E. HayesG.P. HeathH. F. HeathCalabria University , Physics Dept. and INFN , Cosenza , ItalyDavid PiccioniPhysikalisches Institut der Universitiit Bonn , Bonn , GermanyD. G. RoffPhysics Laboratory , University of Bristol , Bristol , UKR.J. TapperPhysics Laboratory , University of Bristol , Bristol , UKR. YoshidaNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)M. ArneodoUniversity andR. AyadCalabria University , Physics Dept. and INFN , Cosenza , ItalyM. CapuaNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)A. GarfagniniCalabria University , Physics Dept. and INFN , Cosenza , ItalyL. IannottiNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)M. SchioppaNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)G. SusinnoPhysics Laboratory , University of Bristol , Bristol , UKA. CaldwellInst. of Nuclear Physics , Cracow , PolandN. CartigliaNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)Z. JingCalabria University , Physics Dept. and INFN , Cosenza , ItalyW. LiuCalabria University , Physics Dept. and INFN , Cosenza , ItalyJ. A. ParsonsCalabria University , Physics Dept. and INFN , Cosenza , ItalyS. RitzColumbia University , Nevis Labs. , Irvington on Hudson , N.Y. , USAF. SciulliNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)P.B. StraubPhysics Laboratory , University of Bristol , Bristol , UKL. WaiUniversity of TurinS. YangCalabria University , Physics Dept. and INFN , Cosenza , ItalyQ. M. ZhuColumbia University , Nevis Labs. , Irvington on Hudson , N.Y. , USAP. BorzemskiInst. of Nuclear Physics , Cracow , PolandJ. J. ChwastowskiInst. of Nuclear Physics , Cracow , PolandA. EskreysInst. of Nuclear Physics , Cracow , PolandZ. JakubowskiColumbia University , Nevis Labs. , Irvington on Hudson , N.Y. , USAM. PrzybycieńM. ZacharaColumbia University , Nevis Labs. , Irvington on Hudson , N.Y. , USAL. ZawiejskiNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)L. AdamczykNIKHEF and University of Amsterdam, The Netherlands4343supported by the Netherlands Foundation for Research on Matter (FOM)B. BednarekFaculty of Physics and Nuclear Techniques , Academy of Mining and Metallurgy , Cracow , Poland
1996en
ABI
Annotatsiya
The production of φ mesons in the reaction e+p → e+φp (φ → K+K−), for 7 < Q2 < 25 GeV2 and virtual photon-proton centre of mass energies (W) in the range 42–134 GeV, has been studied with the ZEUS detector at HERA. When compared to lower energy data at similar Q2, the results show that the γ∗p → φp cross section rises strongly with W. This behaviour is similar to that previously found for the γ∗p → ϱ0p cross section. This strong dependence cannot be explained by production through soft pomeron exchange. It is, however, consistent with perturbative QCD expectations, where it reflects the rise of the gluon momentum density in the proton at small x. The ratio of σ(φ)σ(ϱ0), which has previously been determined by ZEUS to be 0.065 ± 0.013 (stat.) in photoproduction at a mean W of 70 GeV, is measured to be 0.18 ± 0.05 (stat.) ± 0.03 (syst.) at a mean Q2 of 12.3 GeV2 and mean W of ≈ 100 GeV and is thus approaching at large Q2 the value of 29 predicted from the quark charges of the vector mesons and a flavour independent production mechanism.
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