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Title: Search for the electroweak production of supersymmetric particles in root $$\sqrt{s}$$ = 8 TeV $pp$ collisions with the ATLAS detector

Abstract

The ATLAS experiment has performed extensive searches for the electroweak production of charginos, neutralinos, and staus. This article summarizes and extends the search for electroweak supersymmetry with new analyses targeting scenarios not covered by previously published searches. New searches use vector-boson fusion production, initial-state radiation jets, and low-momentum lepton final states, as well as multivariate analysis techniques to improve the sensitivity to scenarios with small mass splittings and low-production cross sections. Results are based on 20 fb$$^{-1}$$ of proton-proton collision data at $$\sqrt{s}$$ = 8 TeV recorded with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. The new and existing searches are combined and interpreted in terms of 95% confidence-level exclusion limits in simplified models, where a single production process and decay mode is assumed, as well as within phenomenological supersymmetric models.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. et al.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
ATLAS Collaboration
OSTI Identifier:
1246817
Report Number(s):
BNL-112031-2016-JA
Journal ID: ISSN 2470-0010; KA1101021
DOE Contract Number:  
SC00112704
Resource Type:
Journal Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Aad, G., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., Adye, T., Affolder, A. A., and Agatonovic-Jovin, T. Search for the electroweak production of supersymmetric particles in root $\sqrt{s}$ = 8 TeV $pp$ collisions with the ATLAS detector. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.93.052002.
Aad, G., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., Adye, T., Affolder, A. A., & Agatonovic-Jovin, T. Search for the electroweak production of supersymmetric particles in root $\sqrt{s}$ = 8 TeV $pp$ collisions with the ATLAS detector. United States. doi:10.1103/PhysRevD.93.052002.
Aad, G., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., Adye, T., Affolder, A. A., and Agatonovic-Jovin, T. Fri . "Search for the electroweak production of supersymmetric particles in root $\sqrt{s}$ = 8 TeV $pp$ collisions with the ATLAS detector". United States. doi:10.1103/PhysRevD.93.052002.
@article{osti_1246817,
title = {Search for the electroweak production of supersymmetric particles in root $\sqrt{s}$ = 8 TeV $pp$ collisions with the ATLAS detector},
author = {Aad, G. and Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Aben, R. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Abreu, R. and Abulaiti, Y. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Adelman, J. and Adomeit, S. and Adye, T. and Affolder, A. A. and Agatonovic-Jovin, T.},
abstractNote = {The ATLAS experiment has performed extensive searches for the electroweak production of charginos, neutralinos, and staus. This article summarizes and extends the search for electroweak supersymmetry with new analyses targeting scenarios not covered by previously published searches. New searches use vector-boson fusion production, initial-state radiation jets, and low-momentum lepton final states, as well as multivariate analysis techniques to improve the sensitivity to scenarios with small mass splittings and low-production cross sections. Results are based on 20 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}$ = 8 TeV recorded with the ATLAS experiment at the Large Hadron Collider. No significant excess beyond Standard Model expectations is observed. The new and existing searches are combined and interpreted in terms of 95% confidence-level exclusion limits in simplified models, where a single production process and decay mode is assumed, as well as within phenomenological supersymmetric models.},
doi = {10.1103/PhysRevD.93.052002},
journal = {Physical Review D},
issn = {2470-0010},
number = ,
volume = 93,
place = {United States},
year = {2016},
month = {3}
}

Works referenced in this record:

The Monte Carlo event generator AcerMC versions 2.0 to 3.8 with interfaces to PYTHIA 6.4, HERWIG 6.5 and ARIADNE 4.1
journal, March 2013

  • Kersevan, Borut Paul; Richter-Wa̧s, Elzbieta
  • Computer Physics Communications, Vol. 184, Issue 3
  • DOI: 10.1016/j.cpc.2012.10.032

Improved luminosity determination in pp collisions at $\sqrt {s} = 7\ \mathrm{TeV}$ using the ATLAS detector at the LHC
journal, August 2013


Upper bounds on supersymmetric particle masses
journal, August 1988


A variable for measuring masses at hadron colliders when missing energy is expected; m T 2 : the truth behind the glamour
journal, September 2003

  • Barr, Alan; Lester, Christopher; Stephens, Phil
  • Journal of Physics G: Nuclear and Particle Physics, Vol. 29, Issue 10
  • DOI: 10.1088/0954-3899/29/10/304

Searches for electroweak production of charginos, neutralinos, and sleptons decaying to leptons and W, Z, and Higgs bosons in pp collisions at 8 TeV
journal, September 2014


Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton–proton collision data
journal, November 2014


NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels
journal, December 2012

  • Czakon, Michal; Mitov, Alexander
  • Journal of High Energy Physics, Vol. 2012, Issue 12
  • DOI: 10.1007/JHEP12(2012)054

Field theory interpretation of supergauges in dual models
journal, November 1971


Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
journal, December 2007


Precision predictions for electroweak superpartner production at hadron colliders with Resummino
journal, July 2013


Event generation with SHERPA 1.1
journal, February 2009


The ATLAS Simulation Infrastructure
journal, September 2010


Radiatively-driven natural supersymmetry at the LHC
journal, December 2013

  • Baer, Howard; Barger, Vernon; Huang, Peisi
  • Journal of High Energy Physics, Vol. 2013, Issue 12
  • DOI: 10.1007/JHEP12(2013)013

Matching NLO QCD computations with parton shower simulations: the POWHEG method
journal, November 2007


Update on vector boson pair production at hadron colliders
journal, November 1999


Total Top-Quark Pair-Production Cross Section at Hadron Colliders Through O ( α S 4 )
journal, June 2013


Squark and gluino production at hadron colliders
journal, May 1997


Search for supersymmetry at $ N \sqrt{s} $ = 8 TeV in final states with jets and two same-sign leptons or three leptons with the ATLAS detector
journal, June 2014

  • Aad, G.; Abbott, B.; Abdallah, J.
  • Journal of High Energy Physics, Vol. 2014, Issue 6
  • DOI: 10.1007/JHEP06(2014)035

Vector boson fusion processes as a probe of supersymmetric electroweak sectors at the LHC
journal, February 2013


MadGraph/MadEvent v4: the new web generation
journal, September 2007


New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
journal, July 2002


Observation and measurement of Higgs boson decays to W W * with the ATLAS detector
journal, July 2015


Dynamics of spontaneous symmetry breaking in the Weinberg-Salam theory
journal, November 1979


Revisiting slepton pair production at the Large Hadron Collider
journal, January 2014

  • Fuks, Benjamin; Klasen, Michael; Lamprea, David R.
  • Journal of High Energy Physics, Vol. 2014, Issue 1
  • DOI: 10.1007/JHEP01(2014)168

Supergauge transformations in four dimensions
journal, February 1974


New parton distributions for collider physics
journal, October 2010


QCD corrections to charged triple vector boson production with leptonic decay
journal, November 2008


Parton distributions for the LHC
journal, July 2009


Low energy dynamical supersymmetry breaking simplified
journal, February 1995


Baryon Number Changing Currents
journal, December 1966

  • Miyazawa, Hironari
  • Progress of Theoretical Physics, Vol. 36, Issue 6
  • DOI: 10.1143/PTP.36.1266

Next-to-next-to-leading logarithm resummation for s -channel single top quark production
journal, March 2010


Dual Theory for Free Fermions
journal, May 1971


Top quark pair production in association with a Z -boson at next-to-leading-order accuracy
journal, March 2012


NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTS
journal, September 2013

  • Hinshaw, G.; Larson, D.; Komatsu, E.
  • The Astrophysical Journal Supplement Series, Vol. 208, Issue 2
  • DOI: 10.1088/0067-0049/208/2/19

Performance of the ATLAS Trigger System in 2010
journal, January 2012


Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation
journal, April 2012


Weak boson fusion production of supersymmetric particles at the CERN LHC
journal, March 2006


NNLO corrections to top pair production at hadron colliders: the quark-gluon reaction
journal, January 2013


Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7$  TeV
journal, March 2011


Three exceptions in the calculation of relic abundances
journal, May 1991


Colour reconnections in Herwig++
journal, November 2012


Vector boson pair production at the LHC
journal, July 2011

  • Campbell, John M.; Ellis, R. Keith; Williams, Ciaran
  • Journal of High Energy Physics, Vol. 2011, Issue 7
  • DOI: 10.1007/JHEP07(2011)018

Implications of dynamical symmetry breaking
journal, February 1976


Softly broken supersymmetry and SU(5)
journal, December 1981


Absolute mass lower limit for the lightest neutralino of the MSSM from e+e− data at s up to 209 GeV
journal, March 2004


New tools for low energy dynamical supersymmetry breaking
journal, March 1996


The anti- k t jet clustering algorithm
journal, April 2008


Inadequacy of zero-width approximation for a light Higgs boson signal
journal, August 2012

  • Kauer, Nikolas; Passarino, Giampiero
  • Journal of High Energy Physics, Vol. 2012, Issue 8
  • DOI: 10.1007/JHEP08(2012)116

Single hadron response measurement and calorimeter jet energy scale uncertainty with the ATLAS detector at the LHC
journal, March 2013


Factorizable dual model of pions
journal, August 1971


Search for supersymmetry in events with four or more leptons in s = 8 TeV p p collisions with the ATLAS detector
journal, September 2014


A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
journal, June 2010

  • Alioli, Simone; Nason, Paolo; Oleari, Carlo
  • Journal of High Energy Physics, Vol. 2010, Issue 6
  • DOI: 10.1007/JHEP06(2010)043

PYTHIA 6.4 physics and manual
journal, May 2006


The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
journal, July 2014

  • Alwall, J.; Frederix, R.; Frixione, S.
  • Journal of High Energy Physics, Vol. 2014, Issue 7
  • DOI: 10.1007/JHEP07(2014)079

One-loop analysis of the electroweak breaking in supersymmetric models and the fine-tuning problem
journal, July 1993


Searches for electroweak neutralino and chargino production in channels with Higgs, Z , and W bosons in p p collisions at 8 TeV
journal, November 2014


Measuring masses of semi-invisibly decaying particle pairs produced at hadron colliders
journal, September 1999


HistFitter software framework for statistical data analysis
journal, April 2015


Tuning Monte Carlo generators: The Perugia tunes
journal, October 2010


Two-loop soft anomalous dimensions for single top quark associated production with a W or H
journal, September 2010


Implications of dynamical symmetry breaking: An addendum
journal, February 1979


Performance of missing transverse momentum reconstruction in proton-proton collisions at $\sqrt{s} = 7~\mbox{TeV}$ with ATLAS
journal, January 2012


Percent-Level-Precision Physics at the Tevatron: Next-to-Next-to-Leading Order QCD Corrections to q q ¯ t t ¯ + X
journal, September 2012


Search for charginos and neutralinos in e+e− collisions at = 189 GeV
journal, January 2000


Low-energy supersymmetry
journal, November 1982


Supersymmetric extension of the SU(3)×SU(2)×U(1) model
journal, June 1982


Herwig++ physics and manual
journal, November 2008


Vector Boson Production at Hadron Colliders: A Fully Exclusive QCD Calculation at Next-to-Next-to-Leading Order
journal, August 2009


Search for associated production of charginos and neutralinos in the trilepton final state using 2.3 fb−1 of data
journal, September 2009


Gauge-symmetry hierarchies
journal, September 1976


Simplified models for a first characterization of new physics at the LHC
journal, April 2009


Phenomenology of the production, decay, and detection of new hadronic states associated with supersymmetry
journal, July 1978


Search for supersymmetry in the vector-boson fusion topology in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
journal, November 2015

  • Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.
  • Journal of High Energy Physics, Vol. 2015, Issue 11
  • DOI: 10.1007/JHEP11(2015)189

Quark Model of Dual Pions
journal, August 1971


Is the neutrino a goldstone particle?
journal, September 1973


A phenomenological model of particle physics based on supersymmetry
journal, April 1982


A lagrangian model invariant under supergauge transformations
journal, March 1974


Hunting quasidegenerate Higgsinos
journal, April 2014


A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
journal, November 2004


Gaugino production in proton-proton collisions at a center-of-mass energy of 8 TeV
journal, October 2012

  • Fuks, Benjamin; Klasen, Michael; Lamprea, David R.
  • Journal of High Energy Physics, Vol. 2012, Issue 10
  • DOI: 10.1007/JHEP10(2012)081

Search for Supersymmetry in p p ¯ Collisions at s = 1.96 TeV Using the Trilepton Signature for Chargino-Neutralino Production
journal, December 2008


Exploration of the MSSM with non-universal Higgs masses
journal, March 2003


Jet energy measurement and its systematic uncertainty in proton–proton collisions at $$\sqrt{s}=7$$ s = 7  TeV with the ATLAS detector
journal, January 2015


Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
journal, October 2014


Top++: A program for the calculation of the top-pair cross-section at hadron colliders
journal, November 2014


Single top production in association with a Z boson at the LHC
journal, June 2013


ALPGEN, a generator for hard multiparton processes in hadronic collisions
journal, July 2003

  • Mangano, Michelangelo L.; Piccinini, Fulvio; Polosa, Antonio D.
  • Journal of High Energy Physics, Vol. 2003, Issue 07
  • DOI: 10.1088/1126-6708/2003/07/001

Single-top production in MC@NLO
journal, March 2006


Super-razor and searches for sleptons and charginos at the LHC
journal, March 2014


Dynamical supersymmetry breaking at low energies
journal, August 1993


Geant4—a simulation toolkit
journal, July 2003

  • Agostinelli, S.; Allison, J.; Amako, K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3
  • DOI: 10.1016/S0168-9002(03)01368-8

Presentation of search results: the CL s technique
journal, September 2002


The MSSM parameter space with non-universal Higgs masses
journal, July 2002


Single-top hadroproduction in association with a W boson
journal, July 2008


Supersymmetry and weak, electromagnetic and strong interactions
journal, September 1976


$$ t\overline t {W^{\pm }} $$ production and decay at NLO
journal, July 2012

  • Campbell, John M.; Ellis, R. Keith
  • Journal of High Energy Physics, Vol. 2012, Issue 7
  • DOI: 10.1007/JHEP07(2012)052

    Works referencing / citing this record:

    A lagrangian model invariant under supergauge transformations
    journal, March 1974


    Supersymmetry and weak, electromagnetic and strong interactions
    journal, September 1976


    Factorizable dual model of pions
    journal, August 1971


    Softly broken supersymmetry and SU(5)
    journal, December 1981


    The Monte Carlo event generator AcerMC versions 2.0 to 3.8 with interfaces to PYTHIA 6.4, HERWIG 6.5 and ARIADNE 4.1
    journal, March 2013

    • Kersevan, Borut Paul; Richter-Wa̧s, Elzbieta
    • Computer Physics Communications, Vol. 184, Issue 3
    • DOI: 10.1016/j.cpc.2012.10.032

    Search for associated production of charginos and neutralinos in the trilepton final state using 2.3 fb−1 of data
    journal, September 2009


    Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation
    journal, April 2012


    NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE ( WMAP ) OBSERVATIONS: COSMOLOGICAL PARAMETER RESULTS
    journal, September 2013

    • Hinshaw, G.; Larson, D.; Komatsu, E.
    • The Astrophysical Journal Supplement Series, Vol. 208, Issue 2
    • DOI: 10.1088/0067-0049/208/2/19

    Presentation of search results: the CL s technique
    journal, September 2002


    New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
    journal, July 2002


    ALPGEN, a generator for hard multiparton processes in hadronic collisions
    journal, July 2003

    • Mangano, Michelangelo L.; Piccinini, Fulvio; Polosa, Antonio D.
    • Journal of High Energy Physics, Vol. 2003, Issue 07
    • DOI: 10.1088/1126-6708/2003/07/001

    Single-top production in MC@NLO
    journal, March 2006


    MadGraph/MadEvent v4: the new web generation
    journal, September 2007


    Search for top squarks decaying to tau sleptons in p p collisions at s = 13 Te V with the ATLAS detector
    journal, August 2018


    Parton distributions for the LHC
    journal, July 2009


    Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7$  TeV
    journal, March 2011


    Single hadron response measurement and calorimeter jet energy scale uncertainty with the ATLAS detector at the LHC
    journal, March 2013


    Improved luminosity determination in pp collisions at $\sqrt {s} = 7\ \mathrm{TeV}$ using the ATLAS detector at the LHC
    journal, August 2013


    Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
    journal, October 2014


    Jet energy measurement and its systematic uncertainty in proton–proton collisions at $$\sqrt{s}=7$$ s = 7  TeV with the ATLAS detector
    journal, January 2015


    HistFitter software framework for statistical data analysis
    journal, April 2015


    Field theory interpretation of supergauges in dual models
    journal, November 1971


    Supergauge transformations in four dimensions
    journal, February 1974


    Low-energy supersymmetry
    journal, November 1982


    Top++: A program for the calculation of the top-pair cross-section at hadron colliders
    journal, November 2014


    A variable for measuring masses at hadron colliders when missing energy is expected; m T 2 : the truth behind the glamour
    journal, September 2003

    • Barr, Alan; Lester, Christopher; Stephens, Phil
    • Journal of Physics G: Nuclear and Particle Physics, Vol. 29, Issue 10
    • DOI: 10.1088/0954-3899/29/10/304

    A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
    journal, November 2004


    PYTHIA 6.4 physics and manual
    journal, May 2006


    The anti- k t jet clustering algorithm
    journal, April 2008


    Event generation with SHERPA 1.1
    journal, February 2009


    Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
    journal, December 2007


    Performance of the ATLAS Trigger System in 2010
    journal, January 2012


    Single-top hadroproduction in association with a W boson
    journal, July 2008


    Precision predictions for electroweak superpartner production at hadron colliders with Resummino
    journal, July 2013


    Measurement of the muon reconstruction performance of the ATLAS detector using 2011 and 2012 LHC proton–proton collision data
    journal, November 2014