New Physics Searches with Photons in CDF

A brief review of searches for physics beyond the Standard Model with photons using the CDF detector at the Tevatron is given here. These include searches for supersymmetry, extra dimensions, excited electrons and W/Z$+\gamma$ production, as well as anomalous photon production. Recent results from CDF Run II experiment is presented, but some results from Run I are also reviewed.Comment: To appear in the Proceedings of SUSY 2003, held at the University of Arizona, Tucson, AZ, 5-10 June 200

Searches for Physics Beyond the Standard Model at CMS

Recent results on searches for physics beyond the Standard Model at Large Hadron Collider are presented, based on early LHC data in proton-proton collisions at $\sqrt{s} = 7$ TeV collected by the CMS experiment. Prospects of early SUSY searches at CMS are also outlined.Comment: 6 pages, Proceedings of Hadron Collider Physics Symposium, HCP 2010, Toront

Prompt photon processes in photoproduction at HERA

We present results for the photoproduction of inclusive prompt photons and for prompt photons accompanied by jets, measured with the ZEUS detector at HERA. Cross sections as a function of pseudorapidity and transverse energy are presented for 5 5 GeV in the centre of mass energy range 120-270 GeV. Comparisons are made with predictions from leading logarithm parton shower Monte Carlos and next-to-leading order QCD calculations using currently available models of the photon structure. NLO QCD calculations describe the shape and magnitude of the measurements reasonably well.Comment: Talk given at Photon99 Conference, Freiburg, German

Measurements of Prompt Photon Photoproduction at HERA

Measurements of inclusive prompt photon and prompt photons, together with an accompanying jet, in photoproduction at HERA have been made with the ZEUS detector, using an integrated luminosity of 38.4 pb-1. We have performed two analyses in the study of prompt photon production. First inclusive cross section measurements for prompt photon production have been presented as a function of the pseudorapidity and the transverse energy (etagamma, ETgamma)of the photon, for ETgamma > 5 GeV in the gammap centre-of-mass energy range 134-285 GeV. Comparisons are made with predictions from Monte Carlo models having leading-logarithm parton showers, and with next-to-leading order QCD calculations, using currently available parameterisations of the photon structure. For positive etagamma (proton direction) there is good agreement, but for negative etagamma all predictions fall below the data. None of the available variations of the model parameters was found to be capable of removing the discrepancy with the data. The results indicated a need to review the present theoretical modelling of the parton structure of the photon at high xgamma regions. A study of the intrinsic parton transverse momentum, kT, of the quarks in the proton, as modelled within the framework of the PYTHIA Monte Carlo, has been performed using the kinematical properties of events with a measured jet as well as a prompt photon. A fit to the data gives a value of = 1.39 +/- 0.36+0.12-0.23GeV. This result is compared with earlier high-energy proton-scattering measurements. A rising trend of with interaction energy is confirmed