On the numerical analysis of triplet pair production cross-sections and the mean energy of produced particles for modelling electron-photon cascade in a soft photon field

1999 ◽  
Vol 25 (8) ◽  
pp. 1733-1747 ◽  
Author(s):  
V Anguelov ◽  
S Petrov ◽  
L Gurdev ◽  
J Kourtev
Keyword(s):  
Numerical Analysis ◽  
Pair Production ◽  
Cross Sections ◽  
Production Cross ◽  
Soft Photon ◽  
Photon Field ◽  
Triplet Pair ◽  
The Mean ◽  
Electron Photon

scholarly journals Top quark studies with the ATLAS detector

2015 ◽  
Vol 39 ◽  
pp. 1560092
Author(s):  
Marcella Capua
Keyword(s):  
Pair Production ◽  
Cross Sections ◽  
Top Quark ◽  
W Boson ◽  
Production Cross ◽  
Charge Asymmetry ◽  
Atlas Detector ◽  
Top Quark Production ◽  
Top Pair Production ◽  
8 Tev

The latest top quark studies in proton-proton collisions at a centre-of-mass energy of 7 and 8 TeV with the ATLAS detector are reported. We present recent results on the top pair production inclusive cross-sections, top pair production differential cross-section in the resolved and boosted regimes, single top-quark production cross-sections measured in the t-channel, s-channel and W-boson associated processes, as well as the determination of the CKM matrix element [Formula: see text]. The results are compared with theoretical expectations. Latest ATLAS results on top properties will be also shown in terms of direct and pole mass, spin correlations and charge asymmetry.

scholarly journals Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at $$ \sqrt{s} $$ = 7 TeV

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
A. M. Sirunyan ◽  
◽  
A. Tumasyan ◽  
W. Adam ◽  
F. Ambrogi ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Particle Multiplicity ◽  
Proton Proton ◽  
Proton Collisions ◽  
Relative Production ◽  
The Mean ◽  
Activity Dependence ◽  
Proton Proton Collisions ◽  
Number Of Particles

Abstract The ratios of the production cross sections between the excited ϒ(2S) and ϒ(3S) mesons and the ϒ(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. The data are from proton-proton collisions at $$ \sqrt{s} $$ s = 7 TeV, corresponding to an integrated luminosity of 4.8 fb−1, collected with the CMS detector at the LHC. Evidence of a decrease in these ratios as a function of the particle multiplicity is observed, more pronounced at low transverse momentum $$ {p}_{\mathrm{T}}^{\upmu \upmu} $$ p T μμ . For ϒ(nS) mesons with $$ {p}_{\mathrm{T}}^{\upmu \upmu} $$ p T μμ > 7 GeV, where most of the data were collected, the correlation with multiplicity is studied as a function of the underlying event transverse sphericity and the number of particles in a cone around the ϒ(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean $$ {p}_{\mathrm{T}}^{\upmu \upmu} $$ p T μμ values for the ϒ(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases.

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