Virtual Photon Structure from Jet Production at HERA
نویسندگان
چکیده
The feasibility of measuring parton distribution functions of of virtual photons via the jet production at HERA is investigated. Production of jets in ep collisions at HERA offers one of the ways of studying the structure of the virtual photon. Due to the fact that this structure needs time to develop, parton distribution functions (PDF) fi(x, P , Q) of the virtual photon, probed at the hard scattering scale Q, are expected to be decreasing functions of the magnitude P 2 of its virtuality. As P 2 approaches Q from below fq(x, P , Q) should approach parton model formula f i (x, P , Q) ≡ 3α 2π [
منابع مشابه
ar X iv : h ep - p h / 97 07 27 7 v 1 8 J ul 1 99 7 PRA – HEP / 97 – 10 VIRTUAL PHOTON STRUCTURE FROM JET PRODUCTION
Some aspects of extracting the information on the structure of virtual photons from jet production in ep and e + e − collisions are discussed. 1 Virtual particles-why, where and how? Measuring the dependence of the structure of the photon at short distance on its virtuality provides new information on strong interaction dynamics. The results of first attempts in this direction have recently bee...
متن کاملar X iv : h ep - p h / 98 10 45 0 v 1 2 2 O ct 1 99 8 Virtual Photon Structure from Low Q 2 Jet Production
We review next-to-leading order calculations of oneand two-jet production in ep collisions at HERA for photon virtualities in the range 1 < Q < 100 GeV. Soft and collinear singularities are extracted using the phase space slicing method. Numerical results are presented for HERA conditions with the Snowmass jet definition. The transition between photoproduction and deep-inelastic scattering is s...
متن کاملJet Production by Virtual Photons
The production of jets is studied in collisions of virtual photons, γp and γγ, specifically for applications at HERA and LEP2. Photon flux factors are convoluted with matrix elements involving either direct or resolved photons and, for the latter, with parton distributions of the photon. Special emphasis is put on the range of uncertainty in the modeling of the resolved component. The resulting...
متن کاملLow Q Jet Production at HERA in Next-to-Leading Order QCD
We present next-to-leading order calculations of oneand two-jet production in eP collisions at HERA for photon virtualities in the range 1 < Q2 < 100 GeV2 . Soft and collinear singularities are extracted using the phase space slicing method. Numerical results are presented for HERA conditions with the Snowmass jet definition. The transition between photoproduction and deep-inelastic scattering ...
متن کاملJet Cross Sections and Jet Shapes in Photoproduction
The main source of jets at HERA a comes from collisions between protons and quasi-real photons (Q ≈ 0, where Q is the virtuality of the photon) emitted by the electron beam (photoproduction). At lowest order QCD, two hard scattering processes contribute to jet production : the resolved process, in which a parton from the photon interacts with a parton from the proton, producing two jets in the ...
متن کامل