Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in √s = 13 TeV pp collisions with the ATLAS detector

A search for direct top squark pair production resulting in events with either a same-flavour opposite-sign dilepton pair with invariant mass compatible with a Z boson or a pair of jets compatible with a Standard Model (SM) Higgs boson (h) is presented. Requirements on the missing transverse momentu...

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Detalles Bibliográficos
Autores principales: Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Wahlberg, Hernán Pablo, The ATLAS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Exactas
Física
Beyond Standard Model
Hadron-Hadron scattering (experiments)
Higgs physics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87457
Aporte de:
Aportado por : SEDICI (UNLP) de Universidad Nacional de La Plata .
id I19-R120-10915-87457
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Beyond Standard Model
Hadron-Hadron scattering (experiments)
Higgs physics
spellingShingle Ciencias Exactas
Física
Beyond Standard Model
Hadron-Hadron scattering (experiments)
Higgs physics
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in √s = 13 TeV pp collisions with the ATLAS detector
topic_facet Ciencias Exactas
Física
Beyond Standard Model
Hadron-Hadron scattering (experiments)
Higgs physics
description A search for direct top squark pair production resulting in events with either a same-flavour opposite-sign dilepton pair with invariant mass compatible with a Z boson or a pair of jets compatible with a Standard Model (SM) Higgs boson (h) is presented. Requirements on the missing transverse momentum, together with additional selections on leptons, jets, jets identified as originating from b-quarks are imposed to target the other decay products of the top squark pair. The analysis is performed using proton-proton collision data at √s = 13 TeV collected with the ATLAS detector at the LHC in 2015–2016, corresponding to an integrated luminosity of 36.1 fb<sup>-1</sup>. No excess is observed in the data with respect to the SM predictions. The results are interpreted in two sets of models. In the first set, direct production of pairs of lighter top squarks (t˜<sub>1</sub>) with long decay chains involving Z or Higgs bosons is considered. The second set includes direct pair production of the heavier top squark pairs (t˜<sub>2</sub>) decaying via t˜<sub>2</sub>→ Zt˜<sub>1</sub> or t˜<sub>2</sub>→ ht˜<sub>1</sub>. The results exclude at 95% confidence level t˜<sub>2</sub> and t˜<sub>1</sub> masses up to about 800 GeV, extending the exclusion region of supersymmetric parameter space covered by previous LHC searches.
format Articulo
Articulo
author Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_facet Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernán Pablo
The ATLAS Collaboration
author_sort Alconada Verzini, María Josefina
title Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in √s = 13 TeV pp collisions with the ATLAS detector
title_short Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in √s = 13 TeV pp collisions with the ATLAS detector
title_full Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in √s = 13 TeV pp collisions with the ATLAS detector
title_fullStr Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in √s = 13 TeV pp collisions with the ATLAS detector
title_full_unstemmed Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in √s = 13 TeV pp collisions with the ATLAS detector
title_sort search for direct top squark pair production in events with a higgs or z boson, and missing transverse momentum in √s = 13 tev pp collisions with the atlas detector
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/87457
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