Magnifying the ATLAS stealth stop splinter: impact of spin correlations and finite widths

Cohen, Timothy; Hopkins, Walter; Majewski, Stephanie; Ostdiek, Bryan

doi:10.1007/jhep07(2018)142

Title: Magnifying the ATLAS stealth stop splinter: impact of spin correlations and finite widths

Abstract

In this paper, we recast a “stealth stop” search in the notoriously difficult region of the stop-neutralino Simplified Model parameter space for which m($$\tilde{t}$$₁)-m($$\tilde{X}$$~$$0\atop{1}$$)≃m_t . The properties of the final state are nearly identical for tops and stops, while the rate for stop pair production is O(10%) of that for $$t\overline{t}$$. Stop searches away from this stealth region have left behind a “splinter” of open parameter space when m($$\overline{t}$$₁)≃m_t . Removing this splinter requires surgical precision: the ATLAS constraint on stop pair production reinterpreted here treats the signal as a contaminant to the measurement of the top pair production cross section using data from s√=7 TeV and 8 TeV in a correlated way to control for some systematic errors. ATLAS fixed m($$\tilde{t}$$₁)≃mtandm($$\tilde{X}$$~$$0\atop{1}$$)=1 GeV, implying that a careful recasting of these results into the full m($$\tilde{t}$$₁)-m($$\tilde{X}$$~$$0\atop{1}$$) plane is warranted. We find that the parameter space with m($$\tilde{X}$$~$$0\atop{1}$$)≲55 GeV is excluded for m($$\tilde{t}$$₁)≃m_t — although this search does cover new parameter space, it is unable to fully pull the splinter. Along the way, we review a variety of interesting physical issues in detail: (i) when the two-body width is a good approximation; (ii) how assuming the narrow width approximation affects the total rate; (iii ) how the production rate is affected when the wrong widths are used; (iv ) what role propagating the spin correlations consistently through the multi-body decay chain plays in the limits. In addition, we provide a guide to using MadGraph for implementing the full production including finite width and spin correlation effects, and we survey a variety of pitfalls one might encounter.

Authors:

Cohen, Timothy ^[1]; Hopkins, Walter ^[1]; Majewski, Stephanie ^[1];

^[1]

Univ. of Oregon, Eugene, OR (United States). Inst. of Theoretical Science and Center for High Energy Physics, Dept. of Physics

Publication Date:: Mon Jul 23 00:00:00 EDT 2018

Research Org.:: Univ. of Oregon, Eugene (United States); Univ. of Oregon, Eugene, OR (United States)

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

OSTI Identifier:: 1499263

Alternate Identifier(s):: OSTI ID: 1736257; OSTI ID: 1756106

Grant/Contract Number:: SC0011640; SC0012008; SC0018191; SC0017996

Resource Type:: Accepted Manuscript

Journal Name:: Journal of High Energy Physics (Online)

Additional Journal Information:: Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 7; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; supersymmetry phenomenology

Citation Formats


                    Cohen, Timothy, Hopkins, Walter, Majewski, Stephanie, and Ostdiek, Bryan. Magnifying the ATLAS stealth stop splinter: impact of spin correlations and finite widths.  United States: N. p., 2018. 
Web.  doi:10.1007/jhep07(2018)142.

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                    Cohen, Timothy, Hopkins, Walter, Majewski, Stephanie, & Ostdiek, Bryan. Magnifying the ATLAS stealth stop splinter: impact of spin correlations and finite widths.  United States.  https://doi.org/10.1007/jhep07(2018)142

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                    Cohen, Timothy, Hopkins, Walter, Majewski, Stephanie, and Ostdiek, Bryan. Mon .  
"Magnifying the ATLAS stealth stop splinter: impact of spin correlations and finite widths".  United States.  https://doi.org/10.1007/jhep07(2018)142.  https://www.osti.gov/servlets/purl/1499263.

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@article{osti_1499263,

  title        = {Magnifying the ATLAS stealth stop splinter: impact of spin correlations and finite widths},

  author       = {Cohen, Timothy and Hopkins, Walter and Majewski, Stephanie and Ostdiek, Bryan},

  abstractNote = {In this paper, we recast a “stealth stop” search in the notoriously difficult region of the stop-neutralino Simplified Model parameter space for which m($\tilde{t}$1)-m($\tilde{X}$~$0\atop{1}$)≃mt . The properties of the final state are nearly identical for tops and stops, while the rate for stop pair production is O(10%) of that for $t\overline{t}$. Stop searches away from this stealth region have left behind a “splinter” of open parameter space when m($\overline{t}$1)≃mt . Removing this splinter requires surgical precision: the ATLAS constraint on stop pair production reinterpreted here treats the signal as a contaminant to the measurement of the top pair production cross section using data from s√=7 TeV and 8 TeV in a correlated way to control for some systematic errors. ATLAS fixed m($\tilde{t}$1)≃mtandm($\tilde{X}$~$0\atop{1}$)=1 GeV, implying that a careful recasting of these results into the full m($\tilde{t}$1)-m($\tilde{X}$~$0\atop{1}$) plane is warranted. We find that the parameter space with m($\tilde{X}$~$0\atop{1}$)≲55 GeV is excluded for m($\tilde{t}$1)≃mt — although this search does cover new parameter space, it is unable to fully pull the splinter. Along the way, we review a variety of interesting physical issues in detail: (i) when the two-body width is a good approximation; (ii) how assuming the narrow width approximation affects the total rate; (iii ) how the production rate is affected when the wrong widths are used; (iv ) what role propagating the spin correlations consistently through the multi-body decay chain plays in the limits. In addition, we provide a guide to using MadGraph for implementing the full production including finite width and spin correlation effects, and we survey a variety of pitfalls one might encounter.},

  doi          = {10.1007/jhep07(2018)142},

  journal      = {Journal of High Energy Physics (Online)},

  number       = 7,

  volume       = 2018,

  place        = {United States},

  year         = {Mon Jul 23 00:00:00 EDT 2018},

  month        = {Mon Jul 23 00:00:00 EDT 2018}

}

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We present a frequentist analysis of the parameter space of the pMSSM10, in which the following ten soft SUSY-breaking parameters are specified independently at the mean scalar top mass scale M_SUSY ≡ √m_{more » $$\tilde{t}$$₁}m_{$$\tilde{t}$$₂} : the gaugino masses M_1,2,3 , the first-and second-generation squark masses m_{$$\tilde{q}$$₁} = m_{$$\tilde{q}$$₂} , the third-generation squark mass m_{$$\tilde{q}$$₃}, a common slepton mass m_{$$\tilde{ℓ}$$} and a common trilinear mixing parameter A , as well as the Higgs mixing parameter μ , the pseudoscalar Higgs mass M_A and tanβ , the ratio of the two Higgs vacuum expectation values. We use the MultiNest sampling algorithm with ~ 1.2 ×10⁹ points to sample the pMSSM10 parameter space. A dedicated study shows that the sensitivities to strongly interacting sparticle masses of ATLAS and CMS searches for jets, leptons + E-slash_T signals depend only weakly on many of the other pMSSM10 parameters. With the aid of the Atom and Scorpion codes, we also implement the LHC searches for electroweakly interacting sparticles and light stops, so as to confront the pMSSM10 parameter space with all relevant SUSY searches. In addition, our analysis includes Higgs mass and rate measurements using the HiggsSignals code, SUSY Higgs exclusion bounds, the measurements of BR(B_s→μ⁺μ^-) by LHCb and CMS, other B -physics observables, electroweak precision observables, the cold dark matter density and the XENON100 and LUX searches for spin-independent dark matter scattering, assuming that the cold dark matter is mainly provided by the lightest neutralino χ-tilde₁⁰ . We show that the pMSSM10 is able to provide a supersymmetric interpretation of (g-2)_μ , unlike the CMSSM, NUHM1 and NUHM2. As a result, we find (omitting Higgs rates) that the minimum χ2=20.5 with 18 degrees of freedom (d.o.f.) in the pMSSM10, corresponding to a χ2 probability of 30.8 %, to be compared with χ2/d.o.f.=32.8/24(31.1/23)(30.3/22) in the CMSSM (NUHM1) (NUHM2). We display the one-dimensional likelihood functions for sparticle masses, and we show that they may be significantly lighter in the pMSSM10 than in the other models, e.g., the gluino may be as light as ~ 1250 GeV at the 68 % CL, and squarks, stops, electroweak gauginos and sleptons may be much lighter than in the CMSSM, NUHM1 and NUHM2. We discuss the discovery potential of future LHC runs, e⁺e^- colliders and direct detection experiments.« less
Cited by 56
https://doi.org/10.1140/epjc/s10052-015-3599-y

Full Text Available
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 Article Aad, G. ; Abajyan, T. ; Abbott, B. ; ... - Physical Review Letters

A search for direct pair production of supersymmetric top squarks (more »« less
Cited by 21
https://doi.org/10.1103/PhysRevLett.109.211802
Search for the direct production of charginos and neutralinos in final states with tau leptons in $$\sqrt{s}$$ =13 TeV pp collisions with the ATLAS detector

Journal Article Aaboud, M. ; Aad, G. ; Abbott, B. ; ... - European Physical Journal. C, Particles and Fields

A search for the direct production of charginos and neutralinos in final states with at least two hadronically decaying tau leptons is presented. The analysis uses a dataset of pp collisions corresponding to an integrated luminosity of 36.1 fb^-1, recorded with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. No significant deviation from the expected Standard Model background is observed. Limits are derived in scenarios ofmore »« less
Cited by 47
https://doi.org/10.1140/epjc/s10052-018-5583-9

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Citation Formats

Unitarity and causality in a renormalizable field theory with unstable particles journal, March 1963

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

Heavy-quark mass dependence in global PDF analyses and 3- and 4-flavour parton distributions journal, October 2010

SDECAY: a Fortran code for the decays of the supersymmetric particles in the MSSM journal, May 2005

Precision corrections to fine tuning in SUSY journal, June 2017

Sneaky light stop journal, April 2015

Measurement of the $$t\overline{t}$$ t t ¯ production cross-section using $$e\mu $$ e μ events with $$b$$ b -tagged jets in $$pp$$ p p collisions at $$\sqrt{s}=7$$ s = 7 and 8 TeV with the ATLAS detector journal, October 2014

Breakdown of the Narrow Width Approximation for New Physics journal, September 2007

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

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 journal, December 2017

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

The more Minimal Supersymmetric Standard Model journal, November 1996

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

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

Probing light stops with stoponium journal, July 2015

Studying the sensitivity of monotop probes to compressed supersymmetric scenarios at the LHC journal, July 2015

Revealing compressed stops using high-momentum recoils journal, March 2016

(Light) stop signs journal, August 2012

Factorization theorem for decaying spinning particles journal, April 1985

Narrow-width approximation limitations journal, June 2007

Uncertainties on α S in global PDF analyses and implications for predicted hadronic cross sections journal, October 2009

Stops and E̸ T : The shape of things to come journal, February 2013

Closing up a light stop window in natural SUSY at LHC journal, April 2016

Fastlim: a fast LHC limit calculator journal, November 2014

Herwig++ physics and manual journal, November 2008

Search for physics beyond the standard model in events with two leptons of same sign, missing transverse momentum, and jets in proton–proton collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV journal, September 2017

Toward full LHC coverage of natural supersymmetry journal, July 2014

Light stop NLSPs at the Tevatron and LHC journal, August 2011

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

Stop production at hadron colliders journal, March 1998

Removing Gaps in the Exclusion of Top Squark Parameter Space journal, November 2014

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

Search for supersymmetry in events with one lepton and multiple jets exploiting the angular correlation between the lepton and the missing transverse momentum in proton–proton collisions at s = 13 TeV journal, May 2018

Monojetlike Searches for Top Squarks with a b Tag journal, May 2015

Hadronic top-quark pair production with NNLL threshold resummation journal, February 2012

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

Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV journal, August 2017

Natural SUSY endures journal, September 2012

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

An introduction to PYTHIA 8.2 journal, June 2015

NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions journal, January 2016

Asymptotic formulae for likelihood-based tests of new physics journal, February 2011

Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations journal, March 2013

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

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

SUSY, the Third Generation and the LHC journal, March 2012

Narrow-width approximation accuracy journal, June 2009

Cornering natural SUSY at LHC Run II and beyond journal, August 2017

Search for new phenomena with the $$M_{\mathrm {T2}}$$ M T 2 variable in the all-hadronic final state produced in proton–proton collisions at $$\sqrt{s} = 13$$ s = 13 $$\,\text {TeV}$$ TeV journal, October 2017

NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions text, January 2016

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

Parton distributions for the LHC text, January 2007

The anti-k_t jet clustering algorithm text, January 2008

Herwig++ Physics and Manual text, January 2008

Narrow-width approximation accuracy text, January 2008

Parton distributions for the LHC text, January 2009

Uncertainties on alpha_S in global PDF analyses and implications for predicted hadronic cross sections text, January 2009

Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation text, January 2011

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

NNLO corrections to top pair production at hadron colliders: the quark-gluon reaction text, January 2012

Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations text, January 2012

Toward Full LHC Coverage of Natural Supersymmetry text, January 2013

Sneaky light stop text, January 2014

Probing Light Stops with Stoponium preprint, January 2015

Revealing Compressed Stops Using High-Momentum Recoils text, January 2015

Cornering Natural SUSY at LHC Run II and Beyond text, January 2016

Narrow-width approximation limitations text, January 2007

Narrow-width approximation accuracy journal, June 2009

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

NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions text, January 2016

Hadronic top-quark pair production with NNLL threshold resummation text, January 2011

Dispelling the N^3 myth for the Kt jet-finder text, January 2005

Breakdown of the Narrow Width Approximation for New Physics text, January 2007

Unitarity and causality in a renormalizable field theory with unstable particles
journal, March 1963

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

Heavy-quark mass dependence in global PDF analyses and 3- and 4-flavour parton distributions
journal, October 2010

SDECAY: a Fortran code for the decays of the supersymmetric particles in the MSSM
journal, May 2005

Precision corrections to fine tuning in SUSY
journal, June 2017

Sneaky light stop
journal, April 2015

Measurement of the $$t\overline{t}$$ t t ¯ production cross-section using $$e\mu $$ e μ events with $$b$$ b -tagged jets in $$pp$$ p p collisions at $$\sqrt{s}=7$$ s = 7 and 8 TeV with the ATLAS detector
journal, October 2014

Breakdown of the Narrow Width Approximation for New Physics
journal, September 2007

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

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
journal, December 2017

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

The more Minimal Supersymmetric Standard Model
journal, November 1996

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

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

Probing light stops with stoponium
journal, July 2015

Studying the sensitivity of monotop probes to compressed supersymmetric scenarios at the LHC
journal, July 2015

Revealing compressed stops using high-momentum recoils
journal, March 2016

(Light) stop signs
journal, August 2012

Factorization theorem for decaying spinning particles
journal, April 1985

Narrow-width approximation limitations
journal, June 2007

Uncertainties on α S in global PDF analyses and implications for predicted hadronic cross sections
journal, October 2009

Stops and ${E̸}_{T}$ : The shape of things to come
journal, February 2013

Closing up a light stop window in natural SUSY at LHC
journal, April 2016

Fastlim: a fast LHC limit calculator
journal, November 2014

Herwig++ physics and manual
journal, November 2008

Search for physics beyond the standard model in events with two leptons of same sign, missing transverse momentum, and jets in proton–proton collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV
journal, September 2017

Toward full LHC coverage of natural supersymmetry
journal, July 2014

Light stop NLSPs at the Tevatron and LHC
journal, August 2011

Total Top-Quark Pair-Production Cross Section at Hadron Colliders Through $O (α_{S}^{4})$
journal, June 2013

Stop production at hadron colliders
journal, March 1998

Removing Gaps in the Exclusion of Top Squark Parameter Space
journal, November 2014

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

Search for supersymmetry in events with one lepton and multiple jets exploiting the angular correlation between the lepton and the missing transverse momentum in proton–proton collisions at $\sqrt{s} = 13 TeV$
journal, May 2018

Monojetlike Searches for Top Squarks with a $b$ Tag
journal, May 2015

Hadronic top-quark pair production with NNLL threshold resummation
journal, February 2012

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

Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV
journal, August 2017

Natural SUSY endures
journal, September 2012

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

An introduction to PYTHIA 8.2
journal, June 2015

NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions
journal, January 2016

Asymptotic formulae for likelihood-based tests of new physics
journal, February 2011

Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
journal, March 2013

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

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

SUSY, the Third Generation and the LHC
journal, March 2012

Narrow-width approximation accuracy
journal, June 2009

Cornering natural SUSY at LHC Run II and beyond
journal, August 2017

Search for new phenomena with the $$M_{\mathrm {T2}}$$ M T 2 variable in the all-hadronic final state produced in proton–proton collisions at $$\sqrt{s} = 13$$ s = 13 $$\,\text {TeV}$$ TeV
journal, October 2017

NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions
text, January 2016

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

Parton distributions for the LHC
text, January 2007

The anti-k_t jet clustering algorithm
text, January 2008

Herwig++ Physics and Manual
text, January 2008

Narrow-width approximation accuracy
text, January 2008

Parton distributions for the LHC
text, January 2009

Uncertainties on alpha_S in global PDF analyses and implications for predicted hadronic cross sections
text, January 2009

Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation
text, January 2011

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

NNLO corrections to top pair production at hadron colliders: the quark-gluon reaction
text, January 2012

Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
text, January 2012

Toward Full LHC Coverage of Natural Supersymmetry
text, January 2013

Sneaky light stop
text, January 2014

Probing Light Stops with Stoponium
preprint, January 2015

Revealing Compressed Stops Using High-Momentum Recoils
text, January 2015

Cornering Natural SUSY at LHC Run II and Beyond
text, January 2016

Narrow-width approximation limitations
text, January 2007

Narrow-width approximation accuracy
journal, June 2009

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

NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions
text, January 2016

Hadronic top-quark pair production with NNLL threshold resummation
text, January 2011

Dispelling the N^3 myth for the Kt jet-finder
text, January 2005

Breakdown of the Narrow Width Approximation for New Physics
text, January 2007