Measurements of t¯t differential cross-sections of highly boosted top quarks decaying to all-hadronic final states in pp collisions at √s p = 13 TeV using the ATLAS detector

Measurements are made of differential cross-sections of highly boosted pair-produced top quarks as a function of top-quark and t ̄t system kinematic observables using proton-proton collisions at a center-of- mass energy of ffiffi s p 1⁄4 13 TeV. The data set corresponds to an integrated luminosity o...

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Bibliographic Details
Authors: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The Atlas Collaboration
Format: article
Status:Published version
Publication Date:2018
Country:Argentina
Institution:Universidad Nacional de La Plata
Repository:SEDICI (UNLP)
Language:English
OAI Identifier:oai:sedici.unlp.edu.ar:10915/73188
Online Access:http://sedici.unlp.edu.ar/handle/10915/73188
Access Level:Open access
Keyword:Ciencias Exactas
Física
Atlas detector
cross-sections
all-hadronic
pp collisions
Description
Summary:Measurements are made of differential cross-sections of highly boosted pair-produced top quarks as a function of top-quark and t ̄t system kinematic observables using proton-proton collisions at a center-of- mass energy of ffiffi s p 1⁄4 13 TeV. The data set corresponds to an integrated luminosity of 36.1 fb−1, recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Events with two large- radius jets in the final state, one with transverse momentum pT > 500 GeV and a second with pT > 350 GeV, are used for the measurement. The top-quark candidates are separated from the multijet background using jet substructure information and association with a b-tagged jet. The measured spectra are corrected for detector effects to a particle-level fiducial phase space and a parton-level limited phase space, and are compared to several Monte Carlo simulations by means of calculated χ2 values. The cross- section for t ̄t production in the fiducial phase-space region is 292 7ðstatÞ 71ðsystÞ fb, to be compared to the theoretical prediction of 384 36 fb.

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