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Higgsino DM Is Dead

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Higgsino DM Is Dead Cornering Higgsino at the LHC Satoshi Shirai (Kavli IPMU) Based on H. Fukuda, N. Nagata, H. Oide, H. Otono, and SS, “Higgsino Dark Matter in High-Scale Supersymmetry,” JHEP 1501 (2015) 029, “Higgsino Dark Matter or Not,” Phys.Lett. B781 (2018) 306 “Cornering Higgsino: Use of Soft Displaced Track ”, arXiv:1910.08065 1. Higgsino Dark Matter 2. Current Status of Higgsino @LHC mono-jet, dilepton, disappearing track 3. Prospect of Higgsino Use of soft track 4. Summary 2 DM Candidates • Axion • (Primordial) Black hole • WIMP • Others… 3 WIMP Dark Matter Weakly Interacting Massive Particle DM abundance DM Standard Model (SM) particle 500 GeV DM DM SM Time 4 WIMP Miracle 5 What is Higgsino? Higgsino is (pseudo)Dirac fermion Hypercharge |Y|=1/2 SU(2)doublet <1 TeV 6 Pure Higgsino Spectrum two Dirac Fermions ~ 300 MeV Radiative correction 7 Pure Higgsino DM is Dead DM is neutral Dirac Fermion HUGE spin-independent cross section 8 Pure Higgsino DM is Dead DM is neutral Dirac Fermion Purepure Higgsino Higgsino HUGE spin-independent cross section 9 Higgsino Spectrum (with gaugino) With Gauginos, fermion number is violated Dirac fermion into two Majorana fermions 10 Higgsino Spectrum (with gaugino) 11 Higgsino Spectrum (with gaugino) No SI elastic cross section via Z-boson 12 [N. Nagata & SS 2015] Gaugino induced Observables Mass splitting DM direct detection SM fermion EDM 13 Correlation These observables are controlled by gaugino mass Strong correlation among these observables for large tanb 14 Correlation These observables are controlled by gaugino mass Strong correlation among these observables for large tanb XENON1T constraint 15 Viable Higgsino Spectrum 16 Current Status of Higgsino @LHC 17 Collider Signals of DM p, e- DM DM is invisible p, e+ DM 18 Collider Signals of DM p, e- DM DM is invisible p, e+ DM Additional objects are needed to see DM. Missing energy (MET) search gluon photon, … 19 Mono-jet Signatures 100 GeV Higgsino difficult to Higgsino signal 20 Collider Signals of DM p, e- DM DM is invisible p, e+ DM Additional objects are needed to see DM. Missing energy (MET) search gluon photon, … New observable are needed for efficient BG reduction Decay of heavier Higgsino component 21 Current Constraint(higgsino) disappearing track 22 Current Constraint(higgsino) XENON1T disappearing track 23 Almost Pure Higgsino Spectrum Radiative correction 24 LHC Signals p Meta-stable track + MET p + Soft pion? gluon O(1-10)cm 25 Current Constraint(higgsino) XENON1T disappearing track 26 Current Constraint(higgsino) XENON1T Blind Spot disappearing track 27 LHC Signals p Meta-stable track + MET p + Soft pion? gluon <<O(1)cm 28 Use Soft Track 29 Event Display Signal BG ( Z > vv) 30 Signal P P 31 Signal P P One Soft track 32 Signal P P d0 resolution One Soft track 33 Event Display Signal BG ( Z > vv) 34 Background ● Main BG event: Mono boson production: Z > vv ● O(100) tracks per event ● Tracks tend to be soft ● Most of tracks are close to each other ● Secondary track: long-lived particles decay: Ks, strange baryon ● Large impact parameter ● Primary track of large angle scattering with detector material: ● Fake track with large impact parameter 35 Background ● Main BG event: Mono boson production: Z > vv ● O(100) tracks per event ● Tracks tend to be soft ● Most of tracks are close to each other ● Secondary track: long-lived particles decay: Ks, strange baryon ● Large impact parameter ● Primary track of large angle scattering with detector material: ● Fake track with large impact parameter 36 Background vs Signal Signal: 150 GeV Higgsino Delta m = 500 MeV: red line ctau = 2 mm Delta m = 1 GeV : blue line ctau = 0.1 mm 37 Background vs Signal Signal region Signal region Signal: 150 GeV Higgsino Signal region Delta m = 500 MeV: red line ctau = 2 mm Delta m = 1 GeV : blue line ctau = 0.1 mm 38 Event Selection “Mono-jet event” with MET>500 GeV and Signal track satisfying Acceptance rate for Higgsino with 0.5 GeV Delta M ~ 5%. Background ~ 0.5% 50%: Kshort, Sigma,..., 30%: Mis-measurement, 20% Pileup 39 Result [H. Fukuda, N. Nagata, H. Oide, H. Otono, && SS, 2019] Run2 # of BG ~ 250. 40 Result [H. Fukuda, N. Nagata, H. Oide, H. Otono, && SS, 2019] LZ Run2 # of BG ~ 250. 41 Summary Compressed Higgsino has phenomenological importance Higgsino DM likely provide meta-stable particles ● Complementray to DM direct detecion ● Disappering track ● Soft tracks ● Can fill “Delta M” gap region Application to other BSM models: Slepton coannihilation, minimal DM, wino. 42 Inelastic Scattering In DM direct detection, the recoil energy is O(100) keV Mass difference < O(100) keV is excluded 43 ABCD Method In reality, we need data drive background estimation. Acceptance rate of Signal track is almost independent on MET. A, B, C: Control regions: D: Signal region B D S(d0) 6 By using observed data for A, B ,C we can estimate # of signal region D A C D = B x C / A 0 300 500 MET 44 ABCD Method In reality, we need data drive background estimation. Acceptance rate of Signal track is almost independent on MET. Mock data Pythia8 Run2 B D A: 103302 B: 2574 S(d0) 6 C: 10691 D: 261 A C Estimation by ABCD method: D = B x C / A 0 = 266 +-6 300 500 MET BG systematic error ~3%. 45 Full Result 46 Event Display 47.
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