Auto-concealment of supersymmetry in extra dimensions

Dimopoulos, Savas; Howe, Kiel; March-Russell, John; Scoville, James

doi:10.1007/JHEP06(2015)041

Title: Auto-concealment of supersymmetry in extra dimensions

Abstract

In supersymmetric (SUSY) theories with extra dimensions the visible energy in sparticle decays can be significantly reduced and its energy distribution broadened, thus significantly weakening the present collider limits on SUSY. The mechanism applies when the lightest supersymmetric particle (LSP) is a bulk state — e.g. a bulk modulino, axino, or gravitino — the size of the extra dimensions ≳ 10^–14 cm, and for a broad variety of visible sparticle spectra. In such cases the lightest ordinary supersymmetric particle (LOSP), necessarily a brane-localised state, decays to the Kaluza-Klein (KK) discretuum of the LSP. This dynamically realises the compression mechanism for hiding SUSY as decays into the more numerous heavier KK LSP states are favored. We find LHC limits on right-handed slepton LOSPs evaporate, while LHC limits on stop LOSPs weaken to ~350 ÷ 410 GeV compared to ~700 GeV for a stop decaying to a massless LSP. Similarly, for the searches we consider, present limits on direct production of degenerate first and second generation squarks drop to ~450 GeV compared to ~800 GeV for a squark decaying to a massless LSP. Auto-concealment typically works for a fundamental gravitational scale of M* ~10 ÷ 100 TeV, a scale sufficiently high thatmore »« less

Authors:

Dimopoulos, Savas ^[1]; Howe, Kiel ^[2]; March-Russell, John ^[3]; Scoville, James ^[4]

Stanford Univ., Stanford, CA (United States)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stanford Univ., Stanford, CA (United States); Univ. of Oxford, Oxford (United Kingdom)
Univ. of Oxford, Oxford (United Kingdom); United States Air Force Institute of Technology, Wright-Patterson Air Force Base, OH (United States)

Publication Date:: Fri Jun 05 00:00:00 EDT 2015

Research Org.:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

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

OSTI Identifier:: 1335084

Report Number(s):: SLAC-PUB-16750
Journal ID: ISSN 1029-8479; arXiv:1412.0805

Grant/Contract Number:: AC02-76SF00515

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: 2015; Journal Issue: 6; Journal ID: ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Phenomenology-HEP; HEPPH; supersymmetry phenomenology; phenomenology of large extra dimensions

Citation Formats


                    Dimopoulos, Savas, Howe, Kiel, March-Russell, John, and Scoville, James. Auto-concealment of supersymmetry in extra dimensions.  United States: N. p., 2015. 
Web.  doi:10.1007/JHEP06(2015)041.

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                    Dimopoulos, Savas, Howe, Kiel, March-Russell, John, & Scoville, James. Auto-concealment of supersymmetry in extra dimensions.  United States.  https://doi.org/10.1007/JHEP06(2015)041

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                    Dimopoulos, Savas, Howe, Kiel, March-Russell, John, and Scoville, James. Fri .  
"Auto-concealment of supersymmetry in extra dimensions".  United States.  https://doi.org/10.1007/JHEP06(2015)041.  https://www.osti.gov/servlets/purl/1335084.

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@article{osti_1335084,

  title        = {Auto-concealment of supersymmetry in extra dimensions},

  author       = {Dimopoulos, Savas and Howe, Kiel and March-Russell, John and Scoville, James},

  abstractNote = {In supersymmetric (SUSY) theories with extra dimensions the visible energy in sparticle decays can be significantly reduced and its energy distribution broadened, thus significantly weakening the present collider limits on SUSY. The mechanism applies when the lightest supersymmetric particle (LSP) is a bulk state — e.g. a bulk modulino, axino, or gravitino — the size of the extra dimensions ≳ 10–14 cm, and for a broad variety of visible sparticle spectra. In such cases the lightest ordinary supersymmetric particle (LOSP), necessarily a brane-localised state, decays to the Kaluza-Klein (KK) discretuum of the LSP. This dynamically realises the compression mechanism for hiding SUSY as decays into the more numerous heavier KK LSP states are favored. We find LHC limits on right-handed slepton LOSPs evaporate, while LHC limits on stop LOSPs weaken to ~350 ÷ 410 GeV compared to ~700 GeV for a stop decaying to a massless LSP. Similarly, for the searches we consider, present limits on direct production of degenerate first and second generation squarks drop to ~450 GeV compared to ~800 GeV for a squark decaying to a massless LSP. Auto-concealment typically works for a fundamental gravitational scale of M* ~10 ÷ 100 TeV, a scale sufficiently high that traditional searches for signatures of extra dimensions are mostly avoided. If superpartners are discovered, their prompt, displaced, or stopped decays can also provide new search opportunities for extra dimensions with the potential to reach M* ~109 GeV. As a result, this mechanism applies more generally than just SUSY theories, pertaining to any theory where there is a discrete quantum number shared by both brane and bulk sectors.},

  doi          = {10.1007/JHEP06(2015)041},

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

  number       = 6,

  volume       = 2015,

  place        = {United States},

  year         = {Fri Jun 05 00:00:00 EDT 2015},

  month        = {Fri Jun 05 00:00:00 EDT 2015}

}

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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
Lessons and prospects from the pMSSM after LHC Run I

Journal Article Cahill-Rowley, M. ; Hewett, J. L. ; Ismail, A. ; ... - Physical Review. D, Particles, Fields, Gravitation and Cosmology

We study SUSY signatures at the 7, 8 and 14 TeV LHC employing the 19-parameter, R-parity conserving p(henomenological)MSSM, in the scenario with a neutralino lightest supersymmetric particle (LSP). Our results were obtained via a fast Monte Carlo simulation of the ATLAS SUSY analysis suite. The flexibility of this framework allows us to study a wide variety of SUSY phenomena simultaneously and to probe for weak spots in existing SUSY search analyses. We determine the ranges of the sparticle masses that are either disfavored or allowed after the searches with the 7 and 8 TeV data sets are combined. We findmore »« less
https://doi.org/10.1103/PhysRevD.91.055002

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Title: Auto-concealment of supersymmetry in extra dimensions

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Citation Formats

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The scale-invariant NMSSM and the 126 GeV Higgs boson journal, February 2013

Is natural SUSY natural? journal, October 2013

Naturalness and the Status of Supersymmetry journal, October 2013

Maximally Natural Supersymmetry journal, September 2014

MSLED: a minimal supersymmetric large extra dimensions scenario journal, January 2005

MSLED, neutrino oscillations and the cosmological constant journal, September 2005

Anisotropic modulus stabilisation: strings at LHC scales with micron-sized extra dimensions journal, October 2011

D-brane models with non-linear supersymmetry journal, June 2002

Consistent gravitino couplings in non-supersymmetric strings journal, August 2001

Non-linear supersymmetry and intersecting D-branes journal, October 2004

Bigger, better, faster, more at the LHC journal, December 2010

How low can SUSY go? Matching, monojets and compressed spectra journal, September 2012

Model-independent bounds on squarks from monophoton searches journal, August 2012

Higher dimensional supersymmetry in 4D superspace journal, March 2002

Compact Hyperbolic Extra Dimensions: Branes, Kaluza-Klein Modes, and Cosmology journal, July 2000

MadGraph 5: going beyond journal, June 2011

PYTHIA 6.4 physics and manual journal, May 2006

CheckMATE: Confronting your favourite new physics model with LHC data journal, February 2015

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

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

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

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

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

Minimal kinematic constraints and m T 2 journal, December 2008

Search for scalar leptons in e+e− collisions at centre-of-mass energies up to 209 GeV journal, February 2002

Search for scalar leptons and scalar quarks at LEP journal, January 2004

Search for anomalous production of di-lepton events with missing transverse momentum in e+ e- collisions at $\sqrt{s} = {}$183-209 GeV journal, February 2004

Searches for supersymmetric particles in e + e- collisions up to 208 GeV and interpretation of the results within the MSSM journal, December 2003

Production of Charginos, Neutralinos, and Sleptons at Hadron Colliders journal, November 1999

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

Constraining compressed supersymmetry using leptonic signatures journal, October 2012

Compressed electroweakino spectra at the LHC journal, March 2014

Search for contact interactions and large extra dimensions in the dilepton channel using proton–proton collisions at $$\sqrt{s}~=$$ s = 8 TeV with the ATLAS detector journal, December 2014

Kaluza-Klein gravitino production with a single photon at e + e − colliders journal, September 2002

Quantum gravity and extra dimensions at high-energy colliders journal, April 1999

Indirect Collider Signals for Extra Dimensions journal, June 1999

Collider Signatures of New Large Space Dimensions journal, March 1999

Graviton loops and brane observables journal, May 2001

Constraints on extra-dimensional theories from virtual-graviton exchange journal, July 2003

Graviton collider effects in one and more large extra dimensions journal, January 2005

Bulk stabilization, the extra-dimensional Higgs portal and missing energy in Higgs events journal, May 2013

A review of the mass measurement techniques proposed for the Large Hadron Collider journal, November 2010

LHC/ILC interplay in SUSY searches journal, May 2008

Measuring Lifetimes of Long-Lived Charged Massive Particles Stopped in LHC Detectors journal, October 2009

Identifying the origin of longevity of meta-stable stau at the LHC journal, January 2012

Split supersymmetry at colliders journal, February 2005

Detecting exotic heavy leptons at the large hadron collider journal, August 2001

Study of chargino-neutralino production at hadron colliders in a long-lived slepton scenario journal, November 2008

Higgsstrahlung from R-hadrons journal, November 2011

Supergravity at colliders journal, May 2004

Geometric couplings and brane supersymmetry breaking journal, November 2001

Brane-worlds pseudo-Goldstinos journal, March 2008

Soft masses in theories with supersymmetry breaking by TeV compactification journal, April 1999

The standard model from extra dimensions journal, October 1998

The Higgs mass as a function of the compactification scale journal, September 2003

Radiative electroweak symmetry breaking from a quasi-localized top quark journal, July 2003

Supersymmetry and electroweak breaking in the interval journal, November 2005

Spontaneous breaking of supersymmetry through dimensional reduction journal, March 1979

How to get masses from extra dimensions journal, January 1979

Superstrings with spontaneously broken supersymmetry and their effective theories journal, May 1989

Supersymmetry breaking in string-derived supergravities journal, October 1989

Gravity-mediated supersymmetry breaking in the brane world journal, February 2002

Effects of Squark Processes on the Axino CDM Abundance journal, July 2002

Axion mediation journal, July 2013

Brane–antibrane kinetic mixing, millicharged particles and SUSY breaking journal, May 2004

Kinetic mixing of the photon with hidden U(1)s in string phenomenology journal, July 2008

The last vestiges of naturalness
journal, March 2014

The scale-invariant NMSSM and the 126 GeV Higgs boson
journal, February 2013

Is natural SUSY natural?
journal, October 2013

Naturalness and the Status of Supersymmetry
journal, October 2013

Maximally Natural Supersymmetry
journal, September 2014

MSLED: a minimal supersymmetric large extra dimensions scenario
journal, January 2005

MSLED, neutrino oscillations and the cosmological constant
journal, September 2005

Anisotropic modulus stabilisation: strings at LHC scales with micron-sized extra dimensions
journal, October 2011

D-brane models with non-linear supersymmetry
journal, June 2002

Consistent gravitino couplings in non-supersymmetric strings
journal, August 2001

Non-linear supersymmetry and intersecting D-branes
journal, October 2004

Bigger, better, faster, more at the LHC
journal, December 2010

How low can SUSY go? Matching, monojets and compressed spectra
journal, September 2012

Model-independent bounds on squarks from monophoton searches
journal, August 2012

Higher dimensional supersymmetry in 4D superspace
journal, March 2002

Compact Hyperbolic Extra Dimensions: Branes, Kaluza-Klein Modes, and Cosmology
journal, July 2000

MadGraph 5: going beyond
journal, June 2011

PYTHIA 6.4 physics and manual
journal, May 2006

CheckMATE: Confronting your favourite new physics model with LHC data
journal, February 2015

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

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

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

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

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

Minimal kinematic constraints and m _{T 2}
journal, December 2008

Search for scalar leptons in e+e− collisions at centre-of-mass energies up to 209 GeV
journal, February 2002

Search for scalar leptons and scalar quarks at LEP
journal, January 2004

Search for anomalous production of di-lepton events with missing transverse momentum in e⁺ e^- collisions at $\sqrt{s} = {}$183-209 GeV
journal, February 2004

Searches for supersymmetric particles in e ⁺ e^- collisions up to 208 GeV and interpretation of the results within the MSSM
journal, December 2003

Production of Charginos, Neutralinos, and Sleptons at Hadron Colliders
journal, November 1999

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

Constraining compressed supersymmetry using leptonic signatures
journal, October 2012

Compressed electroweakino spectra at the LHC
journal, March 2014

Search for contact interactions and large extra dimensions in the dilepton channel using proton–proton collisions at $$\sqrt{s}~=$$ s = 8 TeV with the ATLAS detector
journal, December 2014

Kaluza-Klein gravitino production with a single photon at $e^{+} e^{-}$ colliders
journal, September 2002

Quantum gravity and extra dimensions at high-energy colliders
journal, April 1999

Indirect Collider Signals for Extra Dimensions
journal, June 1999

Collider Signatures of New Large Space Dimensions
journal, March 1999

Graviton loops and brane observables
journal, May 2001

Constraints on extra-dimensional theories from virtual-graviton exchange
journal, July 2003

Graviton collider effects in one and more large extra dimensions
journal, January 2005

Bulk stabilization, the extra-dimensional Higgs portal and missing energy in Higgs events
journal, May 2013

A review of the mass measurement techniques proposed for the Large Hadron Collider
journal, November 2010

LHC/ILC interplay in SUSY searches
journal, May 2008

Measuring Lifetimes of Long-Lived Charged Massive Particles Stopped in LHC Detectors
journal, October 2009

Identifying the origin of longevity of meta-stable stau at the LHC
journal, January 2012

Split supersymmetry at colliders
journal, February 2005

Detecting exotic heavy leptons at the large hadron collider
journal, August 2001

Study of chargino-neutralino production at hadron colliders in a long-lived slepton scenario
journal, November 2008

Higgsstrahlung from R-hadrons
journal, November 2011

Supergravity at colliders
journal, May 2004

Geometric couplings and brane supersymmetry breaking
journal, November 2001

Brane-worlds pseudo-Goldstinos
journal, March 2008

Soft masses in theories with supersymmetry breaking by TeV compactification
journal, April 1999

The standard model from extra dimensions
journal, October 1998

The Higgs mass as a function of the compactification scale
journal, September 2003

Radiative electroweak symmetry breaking from a quasi-localized top quark
journal, July 2003

Supersymmetry and electroweak breaking in the interval
journal, November 2005

Spontaneous breaking of supersymmetry through dimensional reduction
journal, March 1979

How to get masses from extra dimensions
journal, January 1979

Superstrings with spontaneously broken supersymmetry and their effective theories
journal, May 1989

Supersymmetry breaking in string-derived supergravities
journal, October 1989

Gravity-mediated supersymmetry breaking in the brane world
journal, February 2002

Effects of Squark Processes on the Axino CDM Abundance
journal, July 2002

Axion mediation
journal, July 2013

Brane–antibrane kinetic mixing, millicharged particles and SUSY breaking
journal, May 2004

Kinetic mixing of the photon with hidden U(1)s in string phenomenology
journal, July 2008