CERN Accelerating science

ATLAS Slides
Report number ATL-PHYS-SLIDE-2020-067
Title Measurements of $K^{0}_{S}$ and $\Lambda^0$ production in $t \bar{t}$ dileptonic events in $pp$ collisions at $\sqrt{s}=7~TeV$ with the ATLAS detector.
Author(s) Calvente Lopez, Sergio (Physics Department, Universidad Autonoma de Madrid)
Corporate author(s) The ATLAS collaboration
Collaboration ATLAS Collaboration
Submitted by on 18 Mar 2020
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords TOP ; QCD ; TOP
Abstract Measurements of $K_S^0$ and $\Lambda^0$ production in $t\bar{t}$ final states have been performed. They are based on a data sample with integrated luminosity of 4.6 $\mathrm{fb}^{-1}$ from proton--proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the ATLAS detector at the Large Hadron Collider. Neutral strange particles are separated into three classes, depending on whether they are contained in a jet, with or without a $b$-tag, or not associated with a selected jet. The aim is to look for differences in their main kinematic distributions. A comparison of data with several Monte Carlo simulations using different hadronisation and fragmentation schemes, colour reconnection models and different tunes for the underlying event has been made. The production of neutral strange particles in $t\bar{t}$ dileptonic events is found to be well described by current Monte Carlo models for $K_S^0$ and $\Lambda^0$ production within jets, but not for those produced outside jets.

 Zapis kreiran 2020-03-18, zadnja izmjena 2020-03-18

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