Radiative Corrections to the Final State of a Single Two-Level Atom

1984 ◽  
pp. 557-561 ◽  
Author(s):  
Josip Seke
Keyword(s):  
Radiative Corrections ◽  
Final State ◽  
Level Atom

scholarly journals NUMERICAL STUDY OF RADIATIVE CORRECTIONS IN THE LOW Q2 REGION AT HERA

1994 ◽  
Vol 09 (18) ◽  
pp. 3229-3244
Author(s):  
K. CHARCHULA ◽  
J. GAJEWSKI
Keyword(s):  
Cross Section ◽  
Numerical Study ◽  
Radiative Corrections ◽  
Hadronic Final State ◽  
Radiative Effects ◽  
Final State ◽  
Cross Section Measurement ◽  
Photoproduction Cross Section ◽  
Section Measurement

A detailed numerical study of radiative corrections in the low Q2 region at the HERA ep collider was performed. The specific case of the total photoproduction cross section measurement was taken as an example. Two different programs, TERAD91 and HER-ACLES4.2, were used to get an estimate of the size of radiative effects. It was found that radiative corrections can be quite large at some points of the space of leptonic (x, y) variables. However, after imposing experimentally feasible cuts on the radiated photon and the hadronic final state one gets corrections at the level of a few per cent.

scholarly journals Processe+e−→3π(γ)with final state radiative corrections

2006 ◽  
Vol 73 (3) ◽  
Author(s):  
S. Bakmaev ◽  
Yu. M. Bystritskiy ◽  
E. A. Kuraev
Keyword(s):  
Radiative Corrections ◽  
Final State

scholarly journals Study of the process e+e-→π+π-γ with the CMD-3 detector at the e+e- collider VEPP-2000

2019 ◽  
Vol 212 ◽  
pp. 04012
Author(s):  
S. S. Tolmachev ◽  
R. R. Akhmetshin ◽  
A. N. Amirkhanov ◽  
A. V. Anisenkov ◽  
V. M. Aulchenko ◽  
...  
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Energy Spectrum ◽  
Photon Energy ◽  
Energy Region ◽  
Radiative Corrections ◽  
Final State ◽  
State Radiation ◽  
Simulation Results ◽  
Photon Energy Spectrum

Existing Monte-Carlo generators with radiative corrections to the e+e-→π+π- process are usually developed under the assumption that pions can be treated as pointlike particles. We study the e+e-→π+π-γ process with final-state radiation and test this assumption using simulated events from the MCGPJ generator based on the scalar QED hypothesis. In order to increase a fraction of events with FSR, the analysis was performed in the energy region to the left from the ρ-meson peak (660÷785 MeV) that is based on the integrated luminosity of about 8.4 pb-1. The experimental data for the photon energy spectrum agree with the simulation results at 1% level.

scholarly journals FERMION MASS SINGULARITIES IN QED AND QCD AND THE MEANING OF THE KINOSHITA-LEE-NAUENBERG THEOREM

1996 ◽  
Vol 11 (37) ◽  
pp. 2921-2931 ◽  
Author(s):  
J.H. FIELD
Keyword(s):  
Radiative Correction ◽  
Quark Mass ◽  
Vacuum Polarization ◽  
Fermion Mass ◽  
Radiative Corrections ◽  
External Scale ◽  
Massless Limit ◽  
Final State

An analysis is presented of radiative corrections due to fermion vacuum polarization for the process e−μ−→e−μ− and the full O(α2) final state QED radiative correction to [Formula: see text]. It is demonstrated that in both cases, the corrections contain next-to-leading logarithmic terms of the form α2 ln [Formula: see text]where Q is the large external scale and m is the fermion mass. These radiative corrections are infinite in the massless limit for any nonvanishing value of α. The role of Landau singularities and the relation of the above results to the Kinoshita-Lee-Nauenberg (KLN) theorem are discussed. Similar considerations also apply to the fermion sector of QCD where m is the quark mass. Thus contrary to many statements to be found in the literature no finite massless version of either QED or QCD can exist.

scholarly journals THE RADIATIVE CORRECTIONS ACCOUNTING IN THE REACTION NEAR-THRESHOLD OF $J/\psi$ PHOTOPRODUCTION

2021 ◽  
Vol 55 (2 (255)) ◽  
pp. 141-147
Author(s):  
Davit A. Martiryan
Keyword(s):  
Lepton Pair ◽  
Electromagnetic Calorimeter ◽  
Radiative Corrections ◽  
Final State ◽  
Jefferson Lab ◽  
Psi Meson ◽  
Electrons And Positrons ◽  
State Selection ◽  
Selection Of ◽  
Near Threshold

The use of the method developed in the CLAS collaboration (Jefferson Lab, USA) of improving leptons momentum for more correct studies of final state selection of quasi-real photoproduction resulting from the reaction to near threshold photoproduction of the $J/\psi$ meson is described. The radiation photons that were detected in electromagnetic calorimeter were studied with electrons and positrons accompanied them in very narrow angles. The method of radiated photon selection of $e^+ e^- p^{\prime}(e^{\prime})$ reaction is given, where $e^+ e^-$ lepton pair is formed during the decay of $J/\psi$ meson.

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