Low Q**2 jet production at HERA and virtual photon structure

The transition between photoproduction and deep-inelastic scattering is investigated in jet production at the HERA ep collider, using data collected by the H1 experiment. Measurements of the differential inclusive jet cross-sections dsigep/dEt* and dsigmep/deta*, where Et* and eta* are the transverse energy and the pseudorapidity of the jets in the virtual photon-proton centre of mass frame, are presented for 0 < Q2 < 49 GeV2 and 0.3 < y < 0.6. The interpretation of the results in terms of the structure of the virtual photon is discussed. The data are best described by QCD calculations which include a partonic structure of the virtual photon that evolves with Q2.

Note:

20 pages, 5 Figures Report-no: DESY 97-179

positron p: colliding beams
positron p: deep inelastic scattering
photon p: interaction
jet: photoproduction
momentum transfer: low
differential cross section: transverse energy
differential cross section: rapidity dependence
photon: resolved
quantum chromodynamics
H1

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