منابع مشابه
Isolated photons at HERA
This contribution describes two recent measurements of isolated photons appearing in photoproduction (measured by ZEUS) and deep inelastic scattering (measured by H1) at the ep collider HERA. 1. Introduction Isolated photons with high transverse momentum in the final state are a sensitive probe of the dynamics of the hard sub-process, since they are largely insensitive to hadronisation and frag...
متن کاملPhotoproduction of isolated photons at HERA in NLO QCD
The NLO QCD calculation for the photoproduction of the isolated photon with a large pT at the HERA ep collider is presented. The single resolved photon contribution and the QCD corrections of order αs to the Born term are consistently included. The sizeable NNLO contributions, the box and the double resolved photon subprocesses, are taken into account in addition. The importance of the isolatio...
متن کاملObservation of Isolated High-ET Photons in Photoproduction at HERA
Events containing an isolated prompt photon with high transverse energy, together with a balancing jet, have been observed for the first time in photoproduction at HERA. The data were taken with the ZEUS detector, in a γp centre of mass energy range 120–250 GeV. The fraction of the incoming photon energy participating in the production of the prompt photon and the jet, xγ , shows a strong peak ...
متن کاملPrompt Photons in Photoproduction at HERA
The production of prompt photons in photoproduction reactions in the ZEUS experiment is discussed. Cross sections for inclusive prompt photons and for prompt photons accompanied by jets are compared with theory, and the latter are used to determine the effective transverse momentum of the quarks in the proton.
متن کاملIsolated Lepton Events at HERA ∗
observed at HERA by the H1 collaboration was announced more than 10 years ago [1]. An excess of HERA I events above a priori expectations (not confirmed by ZEUS, where the analysis was performed in a more restricted phase space, see [2]) has given rise to many speculations on physics beyond the Standard Model. These events continued to appear in runs at HERA II. Both H1 and ZEUS have recently p...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2008
ISSN: 1742-6596
DOI: 10.1088/1742-6596/110/2/022048