Results 1 to 10 of about 96,721 (266)

Direct photon production and PDF fits reloaded [PDF]

open access: yesEuropean Physical Journal C: Particles and Fields, 2018
Direct photon production in hadronic collisions provides a handle on the gluon PDF by means of the QCD Compton scattering process. In this work we revisit the impact of direct photon production on a global PDF analysis, motivated by the recent ...
John M. Campbell   +3 more
doaj   +2 more sources

Multi-crystal native-SAD phasing at 5 keV with a helium environment

open access: yesIUCrJ, 2022
De novo structure determination from single-wavelength anomalous diffraction using native sulfur or phosphorus in biomolecules (native-SAD) is an appealing method to mitigate the labor-intensive production of heavy-atom derivatives and selenomethionyl ...
Akira Karasawa   +6 more
doaj   +1 more source

Measurement of the production cross section of pairs of isolated photons in pp collisions at 13 TeV with the ATLAS detector

open access: yesJournal of High Energy Physics, 2021
A measurement of prompt photon-pair production in proton-proton collisions at s $$ \sqrt{s} $$ = 13 TeV is presented. The data were recorded by the ATLAS detector at the LHC with an integrated luminosity of 139 fb −1.
The ATLAS collaboration   +2890 more
doaj   +1 more source

NLO QCD corrections to exclusive quarkonium-pair production in photon–photon collision

open access: yesEuropean Physical Journal C: Particles and Fields, 2020
We calculate the next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to the exclusive processes $$\gamma +\gamma \rightarrow {\mathcal {Q}}+{\mathcal {Q}}$$ γ+γ→Q+Q , with $${\mathcal {Q}}=J/\psi ,\ \eta _c,\ \Upsilon $$ Q=J/ψ,ηc,Υ , or $
Hao Yang, Zi-Qiang Chen, Cong-Feng Qiao
doaj   +1 more source

Photon fragmentation in the antenna subtraction formalism

open access: yesJournal of High Energy Physics, 2022
The theoretical description of photon production at particle colliders combines direct photon radiation and fragmentation processes, which can not be separated from each other for definitions of photon isolation used in experimental measurements.
Thomas Gehrmann, Robin Schürmann
doaj   +1 more source

Isolated photon and photon+jet production at NNLO QCD accuracy

open access: yesJournal of High Energy Physics, 2020
We describe the calculation of the next-to-next-to-leading order (NNLO) QCD corrections to isolated photon and photon-plus-jet production, and discuss how the experimental hadron-level photon definition and isolation criteria can be approximated in the ...
Xuan Chen   +4 more
doaj   +1 more source

Quadrupole radiation and e+e− pair production in the collision of nonrelativistic nuclei

open access: yesPhysics Letters B, 2021
We analyze the one-photon mechanism of e+e− pair production in the collision of nonrelativistic nuclei. The contribution of electric quadrupole radiation of virtual photon to the corresponding cross section is found. The effect of the finite nuclear size
I.V. Obraztsov, A.I. Milstein
doaj   +1 more source

Simulating hard photon production with Whizard

open access: yesEuropean Physical Journal C: Particles and Fields, 2020
One of the important goals of the proposed future $$\hbox {e}^{+}\hbox {e}^{-}$$ e+e- collider experiments is the search for dark matter particles using different experimental approaches.
J. Kalinowski   +3 more
doaj   +1 more source

Cosmological relaxation through the dark axion portal

open access: yesJournal of High Energy Physics, 2022
The dark axion portal is a coupling of an axion-like particle to a dark photon kinetically mixed with the visible photon. We show how this portal, when applied to the relaxion, can lead to cosmological relaxation of the weak scale using dark photon ...
Valerie Domcke, Kai Schmitz, Tevong You
doaj   +1 more source

Pre-equilibrium Photon and Dilepton Production [PDF]

open access: yesEPJ Web of Conferences
We use QCD kinetic theory to compute photon and dilepton production in the chemically equilibrating out-of-equilibrium quark-gluon plasma created in the early stages of high-energy heavy-ion collisions.
Garcia-Montero Oscar   +3 more
doaj   +1 more source

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