scholarly journals Mixed QCD⊗QED corrections to exclusive Drell Yan production using the qT -subtraction method

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Leandro Cieri ◽  
Daniel de Florian ◽  
Manuel Der ◽  
Javier Mazzitelli
Keyword(s):  
Subtraction Term ◽  
Subtraction Method ◽  
Final State ◽  
Hadronic Collisions

Abstract In this work we extend the qT -subtraction formalism, originally developed for QCD corrections, to the case of mixed QCD⊗QED corrections, and apply it to the fully exclusive calculation of the $$ \mathcal{O}\left({\alpha}_s\alpha \right) $$ O α s α contribution to the production of an off-shell Z boson in hadronic collisions. We present explicit results for the subtraction term and the hard factor, therefore providing all the ingredients needed for the application of the formalism up to $$ \mathcal{O}\left({\alpha}_s\alpha \right) $$ O α s α . To study the phenomenological impact we consider the decay of the off-shell Z boson into a pair of neutrinos, and present kinematical distributions for the final-state leptons at LHC energies.

scholarly journals Threshold resummation for hadronic collisions with three particles in the final state

2016 ◽  
Author(s):  
Anna Kulesza ◽  
Leszek Motyka ◽  
Tomasz Stebel ◽  
Vincent Theeuwes
Keyword(s):  
Final State ◽  
Threshold Resummation ◽  
Hadronic Collisions

scholarly journals Azimuthal correlations in photoproduction and deep inelastic ep scattering at HERA

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
◽  
I. Abt ◽  
R. Aggarwal ◽  
V. Aushev ◽  
O. Behnke ◽  
...  
Keyword(s):  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Neutral Current ◽  
Collective Behaviour ◽  
High Multiplicity ◽  
Centre Of Mass ◽  
Mass Energy ◽  
Final State ◽  
Azimuthal Correlations ◽  
Hadronic Collisions

Abstract Collective behaviour of final-state hadrons, and multiparton interactions are studied in high-multiplicity ep scattering at a centre-of-mass energy $$ \sqrt{s} $$ s = 318 GeV with the ZEUS detector at HERA. Two- and four-particle azimuthal correlations, as well as multiplicity, transverse momentum, and pseudorapidity distributions for charged-particle multiplicities Nch ≥ 20 are measured. The dependence of two-particle correlations on the virtuality of the exchanged photon shows a clear transition from photoproduction to neutral current deep inelastic scattering. For the multiplicities studied, neither the measurements in photoproduction processes nor those in neutral current deep inelastic scattering indicate significant collective behaviour of the kind observed in high-multiplicity hadronic collisions at RHIC and the LHC. Comparisons of PYTHIA predictions with the measurements in photoproduction strongly indicate the presence of multiparton interactions from hadronic fluctuations of the exchanged photon.

scholarly journals Correlations of High-pT Hadrons and Jets in ALICE

Universe ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. 124
Author(s):  
Filip Krizek
Keyword(s):  
Energy Transport ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Jet Quenching ◽  
Relativistic Heavy Ion Collisions ◽  
High Transverse Momentum ◽  
Subtraction Method ◽  
Final State ◽  
Ion Collisions ◽  
Quenching Phenomenon

There are two prominent experimental signatures of quark–gluon plasma creation in ultra-relativistic heavy-ion collisions: the jet quenching phenomenon and the azimuthal-momentum space-anisotropy of final-state particle emission. Recently, the latter signature was also observed in lighter collision systems such as p–Pb or pp. This raises a natural question of whether in these systems, the observed collectivity is also accompanied by jet quenching. In this paper, we overview ALICE measurements of the jet quenching phenomenon studied using semi-inclusive distributions of track-based jets recoiling from a high-transverse momentum ( p T ) hadron trigger in Pb–Pb and p–Pb collisions at LHC energies. The constructed coincidence observable, the per trigger normalized yield of associated recoil jets, is corrected for the complex uncorrelated jet background, including multi-partonic interactions, using a data-driven statistical subtraction method. In the p–Pb data, the observable was measured in events with different underlying event activity and was utilized to set an upper limit on the average medium-induced out-of-cone energy transport for jets with resolution parameter R = 0.4 . The associated jet momentum shift was found to be less than 0.4 GeV/c at 90% confidence.

Nanoscale Servo Control for Galvano Scanner Using Final-State Control

2009 ◽  
Vol 129 (9) ◽  
pp. 938-944 ◽  
Author(s):  
Mitsuo Hirata ◽  
Takahiro Kidokoro ◽  
Shinji Ueda
Keyword(s):  
Servo Control ◽  
State Control ◽  
Final State

Multiple vehicles detection and tracking for intelligent transport systems using machine learning approaches

2019 ◽  
Vol 70 (3) ◽  
pp. 214-224
Author(s):  
Bui Ngoc Dung ◽  
Manh Dzung Lai ◽  
Tran Vu Hieu ◽  
Nguyen Binh T. H.
Keyword(s):  
Machine Learning ◽  
Gaussian Mixture ◽  
Research Field ◽  
Transport Systems ◽  
Learning Approaches ◽  
Subtraction Method ◽  
Intelligent Transport Systems ◽  
Intelligent Transport ◽  
Detection And Tracking ◽  
Multiple Vehicles

Video surveillance is emerging research field of intelligent transport systems. This paper presents some techniques which use machine learning and computer vision in vehicles detection and tracking. Firstly the machine learning approaches using Haar-like features and Ada-Boost algorithm for vehicle detection are presented. Secondly approaches to detect vehicles using the background subtraction method based on Gaussian Mixture Model and to track vehicles using optical flow and multiple Kalman filters were given. The method takes advantages of distinguish and tracking multiple vehicles individually. The experimental results demonstrate high accurately of the method.

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