An improved selection optimization method used for the measurement of ZZ production under conditions of ATLAS experiment during LHC Run ll.

24 Sept 2021, 14:15
25m
Oral report Section 4. Relativistic nuclear physics, elementary particle physics and high-energy physics. Section 4. Relativistic nuclear physics, elementary particle physics and high-energy physics

Speaker

Dmitriy Zubov (National Research Nuclear University MEPhI (RU))

Description

The production of a pair of Z-bosons in the llυυ channel (l = e, μ) is studied with the conditions of proton-proton collisions at a centre-of-mass energy of 13 TeV. The generation of signal and background events is performed using the MadGraph5_aMC@NLO Monte Carlo event generator. The Pythia8 and Delphes3 frameworks are used for event showering, hadronization, and detector response simulation.
This report describes an improved cut-based optimization method to maximize signal significance, where signal significance is considered as a multivariate function of the optimized variables.
The described method makes it possible to find the best combination of cuts for kinematic variables corresponding to the best signal/background ratio. An additional option of the method is the ability to find cuts that satisfy various conditions, such as a limit on the number of minimum signal events.

Primary authors

Dmitriy Zubov (National Research Nuclear University MEPhI (RU)) Diana Pyatiizbyantseva (National Research Nuclear University MEPhI (RU)) Evgeny Soldatov (National Research Nuclear University MEPhI (RU))

Presentation materials