Abstract
The exclusive production of ρ{variant}0mesons in deep inelastic electron-proton scattering has been studied using the ZEUS detector. Cross sections have been measured in the range 7 < Q2< 25 GeV2for λ*p centre of mass (c.m.) energies 40 to 130 GeV. The λ*p → ρ{variant}0p cross section exhibits a Q-(4.2±0.8-0.5 +1.4)dependence and both longitudinally and transversely polarised ρ{variant}0's are observed. The λ*p → ρ{variant}0p cross section rises strongly with increasing c.m. energy, when compared with NMC data at lower energy, which cannot be explained by production through soft pomeron exchange. The data are compared with perturbative QCD calculations where the rise in the cross section reflects the increase in the gluon density at low x.
| Original language | English |
|---|---|
| Pages (from-to) | 601-616 |
| Number of pages | 16 |
| Journal | Physics Letters B |
| Volume | 356 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1995 Aug 24 |
Bibliographical note
Funding Information:I4 Supported by DAAD and European Community Program PRAXIS XXI. I5 Now at Dr. Seidel InformationssystemeF, rankfurt/M. “Now at Inst. of Accelerating Systems Applications (IASA). Athens. ” Now at Mercer ManagementC onsulting, Munich. I8 Now with OPAL Collaboration, Faculty of Physics at Univ. of Freiburg. I9 Now at SAS-Institut GmbH, Heidelberg. ‘O Also supportedb y DESY. ” Now at GSI Darmstadt. 22A lso supportedb y NSERC. 2J Now at Institutef or Cosmic Ray Research,U niversity of Tokyo. 24P artially supportedb y CAM.
Funding Information:
’ Supported by Worldlab, Lausanne, Switzerland. ’ Also at IROE Florence, Italy. 3 Now at Univ. of Salerno and INFN Napoli, Italy. 4 Supported by EU HCM contract ERB-CHRX-CT93-0376. s Now at Mijbelhaus Kramm, Lessen. h Now a self-employed consultant. ’ Now also at University of Torino. ’ Alfred P. Sloan Foundation Fellow. ‘) Presently at Columbia Univ., supported by DAAD/HSPII-AUFE. I” Now at Inst. of Computer Science, Jagellonian Univ., Cracow. ‘I Now at Comma-Soft, Bonn. I2 Visitor from Florida State University. ” Now at Univ. of Mainz.
Funding Information:
25N ow at Carleton University, Ottawa. Canada. % Now at Departmento f Energy, Washington. 27N ow at HEP Div., Argonne National Lab.. Argonne, IL, USA. 2XN ow at Oxford Magnet Technology, Eynsham, Oxon. “) On leave and partially supportedb y DESY 1993-95. “’ Supported by a MlNERVA Fellowship. ” Partially supported by DESY. ‘? Now at Centre for Subatomic Research,U niv.of Alberta, Canada and TRIUME Vancouver, Canada. ” Supported by the Natural Sciences and Engineering Research Council of Canada (NSERC). w Supported by the FCAR of Qukbec, Canada. 1s Supported by the German Federal Ministry for Research and Technology (BMFT). ” Supportedb y the MINERVA Gesellschaftf iir ForschunGgm bH, and by the lsrael Academy of Science. ” Supportedb y the German Israeli Foundation, and by the Israel Academy of Science. ix Supported by the Italian National Institute for Nuclear Physics (INFN). “) Supported by the Japanese Ministry of Education, Science and Culture (the Monbusho) and its grants for Scientific Research. “‘Supported by the Korean Ministry of Education and Korea Science and Engineering Foundation. ” Supportedb y the NetherlandsF oundation for Researcho n Matter (FOM). ” Supportedb y the Polish StateC ommitteef or Scientific Research (grant No. SPB/P3/202/93) and the Foundation for Polish-German Collaboration (proj. No. 506/92). ” Supportedb y the Polish StateC ommitteef or Scientific Research (grant No. PB 861/2/91 and No. 2 2372 9102, grant No. PB 2 2376 9102 and No. PB 2 0092 9101). J.I Partially supported by the German Federal Ministry for Research and Technology (BMFT). j5 Supported by the German Federal Ministry for Research and Technology (BMm), the Volkswagen Foundation, and the Deutsche Forschungsgemeinschaft. J5 Supported by the Spanish Ministry of Education and Science through funds provided by CICYT. 47S upported by the Particle Physics and Astronomy Research Council. 4xS upported by the US Departmentof Energy. ” Supported by the US National Science Foundation.
ASJC Scopus subject areas
- Nuclear and High Energy Physics