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EW Multiplet DM at the FCC-hh
4th FCC Physics and Experiments Workshop, CERN November 11, 2020
M.J. Ramsey-Musolf • T.D. Lee Institute &
Shanghai Jiao Tong Univ. • UMass-Amherst
My pronouns: he/him/his
• [email protected] • 微信 : mjrm-china
Collaborators: • Cheng-Wei Chiang • Giovanna Cottin • Yong Du [1] • Kaori Fuyuto
• Nicole Bell • Matthew Dolan • Leon Friedrich [2] • Raymond Volkas
[1] UMass Amherst [2] U Melbourne
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References
• 2001.05335: N. Bell, M. Dolan, L. Friedrich, MJRM, R. Volkas
• 2003.07867: C.-W. Chiang, G. Cottin, Y. Du, K. Fuyuto, MJRM
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Key Ideas for this Talk
• EW Multiplet DM is in interesting target for the LHC and prospective future colliders
• Disappearing charged track searches provide a particularly powerful probe
• There exists the potential for a high degree of complementarity with direct detection experiments
• The FCC-hh sensitivity depends strongly on pile-up issues ! important challenge for future experimental development
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Outline
I. Context & Questions
II. The Real Triplet Extension
III. Collider & DM Phenomenology
IV. Outlook
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I. Context & Questions
• Are there any DM scenarios that the LHC and future colliders can test definitively ?
• For what fraction of the DM relic density are collider searches sensitive in these scenarios ?
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Dark Matter
6 Thanks: Z. Liu, T. Lin
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Dark Matter
7 Thanks: Z. Liu, T. Lin
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EWPT & Dark Sector: EW Multiplets Cirelli & Strumia ‘05
Real Triplet
“Minimal Scalar DM”
Higgsino
Wino Triplet
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EWPT & Dark Sector: EW Multiplets Cirelli & Strumia ‘05
Real Triplet
“Minimal Scalar DM”
Higgsino
Wino Triplet
Signature: Disappearing charge track S+ ! SDM + π+ (soft)
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WIMP Dark Matter Probes
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Disappearing Charged Track
DM Interactions
χ0SM
SM
χ+
X X = j, V, h
χ0
π+
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Dark Sector: EW Multiplets Mono-jet, DCT, Mono-Z J.F. Zurita
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Dark Sector EW Multiplets @ FCC-hh
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II. Real Triplet Scalar Extension: ΣSM
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The ΣSM
Σ ~ (1, 3, 0)
DM and collider pheno set by EW gauge interactions (fixed by rep) and Higgs portal:
Higgs portal interaction: not widely considered in earlier work
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Mass Spectrum
Small mass splitting due to EW radiative corrections
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For mΣ >> mZ ! Δ mΣ = 166 MeV
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Decays
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Σ+ ! Σ0 + soft
Signature: Disappearing charged track
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III. ΣSM: Collider & DM Phenomenology
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DCT: Real Triplet DM (2008) Basic signature: Charged track disappearing after ~ 5 cm
SM Background: QCD jZ and jW w/ Z !νν & W!lν
Trigger: Monojet (ISR) + large ET
Cuts: large ET hard jet One 5cm track
Fileviez Perez, Patel, MRM, Wang ‘08
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DCT: Real Triplet DM @ LHC (2008) Basic signature: Charged track disappearing after ~ 5 cm
SM Background: QCD jZ and jW w/ Z !νν & W!lν
Trigger: Monojet (ISR) + large ET
Cuts: large ET hard jet One 5cm track
Cirelli et al:
MΣ = 500 GeV:
ΩΣ / ΩCDM ~ 0.1
Fileviez Perez, Patel, MRM, Wang ‘08
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ATLAS DCT Limits: SUSY (AMSB)
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χ+ ! χ0 + soft
1712.02118
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ATLAS DCT Limits: Recast
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• 2001.05335: Simple extrapolation based on cross sections
• 2003.07867: Detailed validation using AMSB model & efficiency map
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ATLAS DCT Limits: Recast
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• 2001.05335: Simple extrapolation based on cross sections
mΣ > 250 GeV
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ATLAS DCT Limits: Recast
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• 2003.07867: Detailed validation using AMSB model & efficiency map
• Trigger: ISR jet
• Selection: pTmiss > 140 GeV, no electrons
or muons, pT and Δφ requirements
• Tracklet selection
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ATLAS DCT Limits: Recast
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• 2003.07867: Detailed validation using AMSB model & efficiency map
pT > 100 GeV
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Project to HL LHC & FCC-hh
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• Employ our real triplet UFO model for event generation
• Includes Higgs portal interaction (coupling a2 )
• HL-LHC: statistics
• FCC-hh: follow 1901.02987 (a) rescale selection requirements (b) include pile-up scenarios ; retain ATLAS tracklet requirements
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Project to HL LHC & FCC-hh
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• Impact of Higgs portal coupling: low mΣ
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Current LHC Limit & HL-LHC Projection
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* Assumes Δ mΣ = 160 MeV
Current*: mΣ > 275 GeV
HL-LHC*: mΣ > 520 GeV
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FCC- hh Projection
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Pile up scenarios
Reach depends significantly on pile up effects
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Real Triplet DM: ΩDM
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Real Triplet DM: ΩDM & Colliders
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ΩΣ / ΩDM
Bound state
Red: LHC Black: FCC-hh
• Significant correlation: a2 , mΣ , ΩΣ
• FCC-hh exclusion: ΩΣ / ΩDM =1 for a2 = 0 (optimistic pile-up) ; successively smaller fraction for larger | a2 |
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Real Triplet DM: Direct Detection & Colliders
31 Red: LHC Black: FCC-hh
• Significant correlation: a2 , mΣ , direct detection limits
• FCC-hh exclusion: can
fill XENON 20t “blind spot” or correlate observations for mΣ < 3 TeV (optimistic pile up scenario)
XENON 1t excl (2018)
XENON 20t proj. excl.
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IV. Outlook
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• EW Multiplet DM is in interesting target for the LHC and prospective future colliders
• Disappearing charged track searches provide a particularly powerful probe
• There exists the potential for a high degree of complementarity with direct detection experiments
• The FCC-hh sensitivity depends strongly on pile-up issues ! important challenge for future experimental development
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Back Up Slides
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EWPT & Dark Sector: EW Multiplets
λeff = 5
λeff = 0
λeff = 2
No co-annihilation No Sommerfeld
EWPT
Saturate ΩDM
W. Chao, G.-J. Ding, X.-G. He, MJRM 1812.07829
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EW Multiplet DM: Direct Detection
Nuc
Nuc
h
χ0
χ0
λeff
Nuc
Nuc
W
W
χ0
χ0
Gauge interactions Higgs portal interactions
W. Chao, G.-J. Ding, X.-G. He, MJRM 1812.07829
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EW Multiplet DM: Direct Detection
λeff = 1 allowed
W. Chao, G.-J. Ding, X.-G. He, MJRM 1812.07829
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EW Multiplet DM: Direct Detection
λeff = 1 allowed
EWPT favored
W. Chao, G.-J. Ding, X.-G. He, MJRM 1812.07829