Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV

Khachatryan, Vardan

doi:10.1140/epjc/s10052-016-4292-5

Title: Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV

Abstract

Results are reported from a search for the pair production of top squarks, the supersymmetric partners of top quarks, in final states with jets and missing transverse momentum. The data sample used in this search was collected by the CMS detector and corresponds to an integrated luminosity of 18.9 inverse femtobarns of proton-proton collisions at a centre-of-mass energy of 8 TeV produced by the LHC. The search features novel background suppression and prediction methods, including a dedicated top quark pair reconstruction algorithm. The data are found to be in agreement with the predicted backgrounds. Exclusion limits are set in simplified supersymmetry models with the top squark decaying to jets and an undetected neutralino, either via a top quark or through a bottom quark and chargino. Models with the top squark decaying via a top quark are excluded for top squark masses up to 755 GeV in the case of neutralino masses below 200 GeV. For decays via a chargino, top squark masses up to 620 GeV are excluded, depending on the masses of the chargino and neutralino.

Authors:

Khachatryan, Vardan ^[1]

Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.

Publication Date:: Tue Aug 16 00:00:00 EDT 2016

Research Org.:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Rice Univ., Houston, TX (United States); Univ. of California, Santa Barbara, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Org.:: CMS Collaboration

OSTI Identifier:: 1288738

Alternate Identifier(s):: OSTI ID: 1411640; OSTI ID: 1595947

Report Number(s):: FERMILAB-PUB-16-107-CMS; CMS-SUS-13-023; CERN-EP-2016-040; arXiv:1603.00765
Journal ID: ISSN 1434-6044; 1425690

Grant/Contract Number:: AC02-07CH11359; AC02-05CH11231; SC0010103; SC0011702

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: European Physical Journal. C, Particles and Fields

Additional Journal Information:: Journal Volume: 76; Journal Issue: 8; Journal ID: ISSN 1434-6044

Publisher:: Springer

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Khachatryan, Vardan. Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV.  United States: N. p., 2016. 
        Web.  doi:10.1140/epjc/s10052-016-4292-5.

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                    Khachatryan, Vardan. Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV.  United States.  https://doi.org/10.1140/epjc/s10052-016-4292-5

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                    Khachatryan, Vardan. 2016.  
        "Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV".  United States.  https://doi.org/10.1140/epjc/s10052-016-4292-5.  https://www.osti.gov/servlets/purl/1288738.

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@article{osti_1288738,

  title        = {Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV},

  author       = {Khachatryan, Vardan},

  abstractNote = {Results are reported from a search for the pair production of top squarks, the supersymmetric partners of top quarks, in final states with jets and missing transverse momentum. The data sample used in this search was collected by the CMS detector and corresponds to an integrated luminosity of 18.9 inverse femtobarns of proton-proton collisions at a centre-of-mass energy of 8 TeV produced by the LHC. The search features novel background suppression and prediction methods, including a dedicated top quark pair reconstruction algorithm. The data are found to be in agreement with the predicted backgrounds. Exclusion limits are set in simplified supersymmetry models with the top squark decaying to jets and an undetected neutralino, either via a top quark or through a bottom quark and chargino. Models with the top squark decaying via a top quark are excluded for top squark masses up to 755 GeV in the case of neutralino masses below 200 GeV. For decays via a chargino, top squark masses up to 620 GeV are excluded, depending on the masses of the chargino and neutralino.},

  doi          = {10.1140/epjc/s10052-016-4292-5},

  url          = {https://www.osti.gov/biblio/1288738},
  journal      = {European Physical Journal. C, Particles and Fields},

  issn         = {1434-6044},

  number       = 8,

  volume       = 76,

  place        = {United States},

  year         = {Tue Aug 16 00:00:00 EDT 2016},

  month        = {Tue Aug 16 00:00:00 EDT 2016}

}

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Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in s = 13 $$ \sqrt{s}=13 $$ TeV pp collisions with the ATLAS detector
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Aaboud, M.; Aad, G.; Abbott, B.
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A search for new phenomena in pp collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV in final states with missing transverse momentum and at least one jet using the $$\alpha _{\mathrm {T}}$$ α T variable
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Searches for pair production of third-generation squarks in $$\sqrt{s}=13$$ s = 13 $$\,\text {TeV}$$ TeV pp collisions
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Sirunyan, A. M.; Tumasyan, A.; Adam, W.
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Search for direct top squark pair production in final states with two leptons in $$\sqrt{s} = 13$$ s = 13 TeV pp collisions with the ATLAS detector
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Title: Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV

Abstract

Citation Formats

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PYTHIA 6.4 physics and manual journal, May 2006

Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in p p Collisions at s = 8 TeV Using the ATLAS Detector journal, April 2015

Model-independent jets plus missing energy searches journal, January 2009

Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at s = 8 TeV journal, September 2014

HERWIG 6: an event generator for hadron emission reactions with interfering gluons (including supersymmetric processes) journal, January 2001

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

Identification and filtering of uncharacteristic noise in the CMS hadron calorimeter journal, March 2010

The catchment area of jets journal, April 2008

Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at √ s = 8 TeV journal, June 2015

Search for direct top squark pair production in events with a $$Z$$ Z boson, $$b$$ b -jets and missing transverse momentum in $$\sqrt{s}=8$$ s = 8 TeV $$pp$$ p p collisions with the ATLAS detector journal, June 2014

The light stop window journal, March 2013

Naturalnes in supersymmetric GUTS journal, June 1981

Supercolor journal, December 1981

Search for direct top-squark pair production in final states with two leptons in pp collisions at $ \sqrt{s} $ = 8 TeV with the ATLAS detector journal, June 2014

Geant4—a simulation toolkit journal, July 2003

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

Search for supersymmetry using razor variables in events with b -tagged jets in p p collisions at s = 8 TeV journal, March 2015

The Jackknife, the Bootstrap and Other Resampling Plans book, January 1982

Simplified models for LHC new physics searches journal, September 2012

Better jet clustering algorithms journal, August 1997

The search for supersymmetry: Probing physics beyond the standard model journal, January 1985

The soft supersymmetry-breaking Lagrangian: theory and applications journal, February 2005

LHC Machine journal, August 2008

Performance of CMS muon reconstruction in pp collision events at √s = 7 TeV journal, October 2012

Rotation of the Andromeda Nebula from a Spectroscopic Survey of Emission Regions journal, January 1970

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

The CMS experiment at the CERN LHC journal, August 2008

Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 $$\,\text {TeV}$$ TeV journal, May 2015

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

Search for scalar top quark production in $ p\bar{p} $ collisions at $ \sqrt{s}=1.96\;\mathrm{TeV} $ journal, October 2012

Polarized charginos (and top quarks) in scalar top quark decays journal, November 2013

Search for a heavy top-quark partner in final states with two leptons with the ATLAS detector at the LHC journal, November 2012

Supergauge transformations in four dimensions journal, February 1974

ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider journal, October 2015

Parton distributions for the LHC journal, July 2009

Confidence level computation for combining searches with small statistics journal, September 1999

Parton distributions with LHC data journal, February 2013

NLO single-top production matched with shower in POWHEG: s - and t -channel contributions journal, September 2009

Supersymmetry, supergravity and particle physics journal, August 1984

Description and performance of track and primary-vertex reconstruction with the CMS tracker journal, October 2014

Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in $ \sqrt{s}=8 $ TeV pp collisions with the ATLAS detector journal, October 2013

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

Polarized tops from stop decays at the LHC journal, March 2009

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

Remarks on Some Nonparametric Estimates of a Density Function journal, September 1956

Searches for supersymmetry based on events with b jets and four W bosons in pp collisions at 8 TeV journal, May 2015

Measurement of the Higgs boson mass from the H → γ γ and H → Z Z * → 4 ℓ channels in p p collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector journal, September 2014

Combined Measurement of the Higgs Boson Mass in p p Collisions at s = 7 and 8 TeV with the ATLAS and CMS Experiments journal, May 2015

Universal interface of TAUOLA: Technical and physics documentation journal, March 2012

Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in p p collisions at s = 8 TeV with the ATLAS detector journal, September 2014

Longitudinally-invariant k⊥-clustering algorithms for hadron-hadron collisions journal, September 1993

Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC journal, September 2012

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC journal, September 2012

Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in s $$ \sqrt{s} $$ = 8 TeV pp collisions with the ATLAS detector journal, November 2014

Measurement of the t t ¯ W $$ t\overline{t}W $$ and t t ¯ Z $$ t\overline{t}Z $$ production cross sections in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector journal, November 2015

Search for Direct Top Squark Pair Production in Final States with One Isolated Lepton, Jets, and Missing Transverse Momentum in $\sqrt{s} = 7 TeV$ $p p$ Collisions Using $4.7 {fb}^{- 1}$ of ATLAS Data
journal, November 2012

Search for a Supersymmetric Partner to the Top Quark in Final States with Jets and Missing Transverse Momentum at $\sqrt{s} = 7 TeV$ with the ATLAS Detector
journal, November 2012

Matching NLO QCD computations and parton shower simulations
journal, June 2002

Upper bounds on supersymmetric particle masses
journal, August 1988

Search for top-squark pair production in the single-lepton final state in pp collisions at $\sqrt{s}=8\ \mathrm{TeV}$
journal, December 2013

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

Identification of b-quark jets with the CMS experiment
journal, April 2013

FastJet user manual: (for version 3.0.2)
journal, March 2012

Search for supersymmetry in hadronic final states with missing transverse energy using the variables α T and b-quark multiplicity in pp collisions at $\sqrt{s} = 8\ \mathrm{TeV}$
journal, September 2013

Search for pair production of the scalar top quark in the electron+muon final state
journal, February 2011

Naturalness, Chiral Symmetry, and Spontaneous Chiral Symmetry Breaking
book, January 1980

The Fast Simulation of the CMS Detector at LHC
journal, December 2011

Determination of jet energy calibration and transverse momentum resolution in CMS
journal, November 2011

Searches for third-generation squark production in fully hadronic final states in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV
journal, June 2015

New parton distributions for collider physics
journal, October 2010

Search for pair production of the scalar top quark in muon+tau final states
journal, April 2012

On Estimation of a Probability Density Function and Mode
journal, September 1962

Gauge models with spontaneously broken local supersymmetry
journal, December 1982

Naturalness constraints in supersymmetric theories with non-universal soft terms
journal, September 1995

Matching NLO QCD and parton showers in heavy flavour production
journal, August 2003

Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at s $$ \sqrt{s} $$ = 8 TeV with the ATLAS detector
journal, September 2014

Naturalness and the Status of Supersymmetry
journal, October 2013

PYTHIA 6.4 physics and manual
journal, May 2006

Measurement of Spin Correlation in Top-Antitop Quark Events and Search for Top Squark Pair Production in $p p$ Collisions at $\sqrt{s} = 8 TeV$ Using the ATLAS Detector
journal, April 2015

Model-independent jets plus missing energy searches
journal, January 2009

Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at $\sqrt{s} = 8 TeV$
journal, September 2014

HERWIG 6: an event generator for hadron emission reactions with interfering gluons (including supersymmetric processes)
journal, January 2001

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

Identification and filtering of uncharacteristic noise in the CMS hadron calorimeter
journal, March 2010

The catchment area of jets
journal, April 2008

Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at √ s = 8 TeV
journal, June 2015

Search for direct top squark pair production in events with a $$Z$$ Z boson, $$b$$ b -jets and missing transverse momentum in $$\sqrt{s}=8$$ s = 8 TeV $$pp$$ p p collisions with the ATLAS detector
journal, June 2014

The light stop window
journal, March 2013

Naturalnes in supersymmetric GUTS
journal, June 1981

Supercolor
journal, December 1981

Search for direct top-squark pair production in final states with two leptons in pp collisions at $ \sqrt{s} $ = 8 TeV with the ATLAS detector
journal, June 2014

Geant4—a simulation toolkit
journal, July 2003

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

Search for supersymmetry using razor variables in events with $b$ -tagged jets in $p p$ collisions at $\sqrt{s} = 8 TeV$
journal, March 2015

The Jackknife, the Bootstrap and Other Resampling Plans
book, January 1982

Simplified models for LHC new physics searches
journal, September 2012

Better jet clustering algorithms
journal, August 1997

The search for supersymmetry: Probing physics beyond the standard model
journal, January 1985

The soft supersymmetry-breaking Lagrangian: theory and applications
journal, February 2005

LHC Machine
journal, August 2008

Performance of CMS muon reconstruction in pp collision events at √s = 7 TeV
journal, October 2012

Rotation of the Andromeda Nebula from a Spectroscopic Survey of Emission Regions
journal, January 1970

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

The CMS experiment at the CERN LHC
journal, August 2008

Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 $$\,\text {TeV}$$ TeV
journal, May 2015

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

Search for scalar top quark production in $ p\bar{p} $ collisions at $ \sqrt{s}=1.96\;\mathrm{TeV} $
journal, October 2012

Polarized charginos (and top quarks) in scalar top quark decays
journal, November 2013

Search for a heavy top-quark partner in final states with two leptons with the ATLAS detector at the LHC
journal, November 2012

Supergauge transformations in four dimensions
journal, February 1974

ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider
journal, October 2015

Parton distributions for the LHC
journal, July 2009

Confidence level computation for combining searches with small statistics
journal, September 1999

Parton distributions with LHC data
journal, February 2013

NLO single-top production matched with shower in POWHEG: s - and t -channel contributions
journal, September 2009

Supersymmetry, supergravity and particle physics
journal, August 1984

Description and performance of track and primary-vertex reconstruction with the CMS tracker
journal, October 2014

Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in $ \sqrt{s}=8 $ TeV pp collisions with the ATLAS detector
journal, October 2013

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

Polarized tops from stop decays at the LHC
journal, March 2009

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

Remarks on Some Nonparametric Estimates of a Density Function
journal, September 1956

Searches for supersymmetry based on events with b jets and four W bosons in pp collisions at 8 TeV
journal, May 2015

Measurement of the Higgs boson mass from the $H \to γ γ$ and $H \to Z Z^{*} \to 4 ℓ$ channels in $p p$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
journal, September 2014

Combined Measurement of the Higgs Boson Mass in $p p$ Collisions at $\sqrt{s} = 7$ and 8 TeV with the ATLAS and CMS Experiments
journal, May 2015

Universal interface of TAUOLA: Technical and physics documentation
journal, March 2012

Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in $p p$ collisions at $\sqrt{s} = 8 TeV$ with the ATLAS detector
journal, September 2014

Longitudinally-invariant k⊥-clustering algorithms for hadron-hadron collisions
journal, September 1993

Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
journal, September 2012

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
journal, September 2012

Search for top squark pair production in final states with one isolated lepton, jets, and missing transverse momentum in s $$ \sqrt{s} $$ = 8 TeV pp collisions with the ATLAS detector
journal, November 2014

Measurement of the t t ¯ W $$ t\overline{t}W $$ and t t ¯ Z $$ t\overline{t}Z $$ production cross sections in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector
journal, November 2015

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

A multidimensional unfolding method based on Bayes' theorem
journal, August 1995

Search for new physics in events with same-sign dileptons and b jets in pp collisions at $ \sqrt{s}=8 $ TeV
journal, March 2013