2019 CAP Congress / Congrès de l'ACP 2019

2-7 June 2019
Simon Fraser University
America/Vancouver timezone
Welcome to the 2019 CAP Congress Program website! / Bienvenue au siteweb du programme du Congrès de l'ACP 2019 !

Improvement of missing transverse momentum reconstruction for ATLAS experiment at LHC

Jun 3, 2019, 11:15 AM
15m
HC126 (Simon Fraser University)

HC126

Simon Fraser University

Oral Competition (Graduate Student) / Compétition orale (Étudiant(e) du 2e ou 3e cycle) Particle Physics / Physique des particules (PPD)

Speaker

Mr Zhelun Li (University of Victoria (CA))

Description

The performance of missing transverse momentum (MET) determination using a new algorithm is presented. The peak luminosity of the LHC in 2017 data-taking reached a new record of $1.90 \cdot 10^{34}$ cm$^{-2}$ s$^{-1}$ and it is aiming to achieve higher luminosity after up-coming upgrades of the Large Hadron Collider (LHC) and produce a larger number of interactions per bunch crossing $<\mu>$. Such increase in pile-up interactions will pose a challenge to the existing MET algorithm. The new pile-up fit (PUfit) algorithm is designed to reduce the sensitivity of the MET to pile-up collisions. The algorithm was tested in di-muon decays of the Z boson in 13 TeV ATLAS data. The Z boson was used as an imaginary source of MET to test and calibrate the algorithm. The estimated resolution and scale were then compared to that produced by the standard offline algorithm. Results of these comparisons will be presented and discussed in this talk.

Primary author

Mr Zhelun Li (University of Victoria (CA))