scholarly journals New method of sampling the Klein-Nishina probability distribution for all incident photon energies above 1 keV (a revised complete account). [Monte Carlo method, differential cross sections]

1978 ◽  
Author(s):  
C.J. Everett ◽  
E.D. Cashwell
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Probability Distribution ◽  
Cross Sections ◽  
Differential Cross ◽  
New Method ◽  
Differential Cross Sections ◽  
Incident Photon ◽  
Complete Account

Differential cross sections for proton compton scattering at incident photon energies between 900 MeV and 1150 MeV

1985 ◽  
Vol 254 ◽  
pp. 458-474 ◽  
Author(s):  
T. Ishii ◽  
K. Egawa ◽  
A. Imanishi ◽  
S. Kato ◽  
Y. Takeuchi ◽  
...  
Keyword(s):  
Compton Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Incident Photon

scholarly journals Analysis of Isolated Photons in Photoproduction in PYTHIA

2019 ◽  
Keyword(s):  
Monte Carlo ◽  
Cross Sections ◽  
Differential Cross ◽  
Transverse Energy ◽  
Differential Cross Sections ◽  
Zeus Detector ◽  
The Cross ◽  
Isolated Photons ◽  
First Time ◽  
Photon Signal

Collision of particles at high energies at accelerators is the main source of data used to obtain deeper understanding of the fundamental interactions and the structure of the matter. Processes of isolated photon production have provided many tests of theoretical descriptions of the universe on scales smaller than the proton. This work is dedicated to the analysis of the large amount of collision data that has been accumulated at ZEUS in 2004-2007 period and new methods of processing isolated photons that have been proposed. The authors develop software algorithms that allow obtaining the signal of isolated photons from the data collected on the ZEUS detector at electron-proton collider HERA, calculating the differential cross sections, and comparing the measured data with PYTHIA Monte Carlo predictions. Taking into account the features of the ZEUS detector, the photon signal is separated from the background events and the number of isolated photons is calculated. Computational mathematical and numerical methods have been used to simulate the interaction of particles in the detector. Monte Carlo predictions for differential cross sections as functions of the pseudorapidity and transverse energy of the photon ηg, ETg and the jet ηjet, ETjet, and the fraction of the photon momentum хgmeas carried by the interacting parton have been calculated and compared with the experimental data. The results of the study are compared with the previous studies and show for the first time that all isolated photon HERA measurements are consistent with each other. New results show improved uncertainties. The formation of isolated inclusive photons and photons with the accompanying jet was measured in photoproduction with ZEUS detector at HERA collider using the integrated luminosity of 374 ± 7 pb-1. For the first time, more complex Monte-Carlo simulation models of isolated photons for ZEUS detector were generated and applied, and the description of the photon signal was improved. It has been found that PYTHIA describes the shape of the cross section as a function of ηg well enough, but does not fully reproduce the shape of ETg, ETjet, and the middle region of хgmeas, while ηjet is described not very well. The reason for this discrepancy can be the lack of corrections of higher orders in the predictions for cross sections of direct photons. Scaling of the cross sections obtained with PYTHIA improves the description of ETg and ηg. The unsatisfactory description of ηjet indicates that further studies are required.

UGR CALCULATION BASED ON THE LUMINANCE SPATIAL-ANGULAR DISTRIBUTION

2020 ◽  
Vol 2020 (4) ◽  
pp. 25-32
Author(s):  
Viktor Zheltov ◽  
Viktor Chembaev
Keyword(s):  
Monte Carlo ◽  
Angular Distribution ◽  
Monte Carlo Method ◽  
Visual Task ◽  
New Method ◽  
Lighting System ◽  
Preliminary Assessment ◽  
System A ◽  
The Monte Carlo Method

The article has considered the calculation of the unified glare rating (UGR) based on the luminance spatial-angular distribution (LSAD). The method of local estimations of the Monte Carlo method is proposed as a method for modeling LSAD. On the basis of LSAD, it becomes possible to evaluate the quality of lighting by many criteria, including the generally accepted UGR. UGR allows preliminary assessment of the level of comfort for performing a visual task in a lighting system. A new method of "pixel-by-pixel" calculation of UGR based on LSAD is proposed.

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