منابع مشابه
Production of Prompt Photons
After a brief review of the production dynamics of prompt single photons in hadron collisions, I summarize a new QCD calculation of the transverse momentum distribution of continuum prompt photon pairs produced by QCD subprocesses, including all-orders soft-gluon resummation valid at next-to-next-to-leading logarithmic accuracy. Resummation is necessary to obtain reliable predictions, as well a...
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It is standard in theoretical neutrino astrophysics to use a broken power law approximation, based on the Band function, to describe the average photon flux of the prompt emission of Gamma-Ray Bursts. We will show that this approximation overestimates the contribution of high energy γ-rays (and underestimates low energy γ-rays). As a consequence models that rely on this approximation overestima...
متن کاملPrompt Photons and Particle Momentum Distributions At
Recent results, obtained by the H1 and ZEUS collaborations, are presented on differential cross sections , for inclusive prompt photon production in DIS and for photoproduction of prompt photons accompanied by a hadronic jet. Also presented are cross sections of normalised scaled momentum distribution of charged final state hadrons, measured by H1 in DIS ep collisions at high Q 2 in the Breit f...
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 کاملPrompt photons with associated jets in photoproduction at HERA
Prompt photons, together with an accompanying jet, have been studied in the photoproduction regime of ep scattering with the ZEUS detector at HERA. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leadingorder (NLO) QCD underestimate the γ+jet cross sections for transverse energies of prompt photons below 7 GeV, while the kT -factorisation QCD calculation agre...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2013
ISSN: 1029-8479
DOI: 10.1007/jhep09(2013)007