Possibilities for MeV-GeV DM at accelerators Gordan Krnjaic, Nhan - - PowerPoint PPT Presentation
Possibilities for MeV-GeV DM at accelerators Gordan Krnjaic, Nhan Tran, Andrew Whitbeck [Fermilab] P REFACE AND OUTLINE Not going to go into the physics and motivation in much detail Just some quick overview of the various possibilities New: a muon
Gordan Krnjaic, Nhan Tran, Andrew Whitbeck [Fermilab]
Just some quick overview of the various possibilities New: a muon beam fixed target experiment at FNAL
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Pseudo-Dirac Fermion Relic Target Majorana Relic Target Elastic & Inelastic Scalar Relic Targets Pseudo-Dirac Fermion Relic Target Majorana Relic Target Elastic & Inelastic Scalar Relic Targets
1 10 102 103 10-16. 10-14. 10-12. 10-10. 10-8. 10-6. 10-4. mc @MeVD y = e2aD HmcêmA'L4
Thermal Relic Targets & Current Constraints
HPseudoLDirac Fermion Inelastic Scalar Majorana Fermion Elastic Scalar
1 10 102 103 10-55. 10-53. 10-51. 10-49. 10-47. 10-45. 10-43. 10-41. 10-39. 10-37. 10-35. mDMHMeVL se Hcm2L
Direct Detection Targets Accelerator Targets
all the direct detection bounds (current and future)Accelerators provide strong complementarity to DD over a range of thermal targets because it can produce DM candidates relativistically
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Missing mass / momentum / energy Beam dump
Scalar Relic Target
BaBar
LHC LEP E787/949@BNL PADME@LNF NA64 @CERN
Pseudo-Dirac Relic Target
VEPP-3 @BINP MMAPS @Cornell DarkLight @JLab
Belle II
LDMX @SLAC
Majorana Relic Target
1 10 102 103 10-16 10-15 10-14 10-13 10-12 10-11 10-10 10-9 10-8 10-7 10-6 10-5 10-4
m [MeV] y = 2D (m /mA')4
Missing Mass/Momentum Experiments (Kinetic Mixing)
Scalar Relic Target Pseudo-Dirac Relic Target
LSND
BDX
E137
MiniBooNE
Majorana Relic Target
1 10 102 103 10-16 10-15 10-14 10-13 10-12 10-11 10-10 10-9 10-8 10-7 10-6 10-5 10-4
m [MeV] y = 2D (m /mA')4
All Beam Dump Experiments (Kinetic Mixing)
LDMX Will come back to proton beam dumps
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1) Model independent test of g-2 anomaly 2) Probe models of muon-philic dark matter
GK, Yoni Kahn (Princeton), NT, AW, arXiv: 1803.XXXXX
https://indico.fnal.gov/event/16719
HCAL ECAL recoil tracker tagging tracker Dipole Magnet target 1m Ecal is based on CMS HGCal Si calorimeter has high radiation tolerance and good MIP tracking Hcal: Fe/Scintillator sampling calo high sampling fraction is good for high efficiency neutron detection Synergy with CMS HCal calorimeter readout electronics (QIE)
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tagging tracker Magnet ECal HCal recoil tracker σ(p)/p ~ % 20 cm 50 X0
CMS HL-LHC ECal Endcap Fe-Scintillator HCal
(CMS electronics)
Strip tracker (D0, HPS)
Target
main difference
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~1e13 PoTTargets
Zoom in: M-Test proton beam 120 GeV target π,e,μ detector hall #1 detector hall #2 block of iron (12ft.) μ
Seaquest
Phase 1: MTest “Shovel ready” 1010 Muons on target, 50 X0 target ~100 days with 105 muons per spill Phase 2: NM4, Seaquest 1013 Muons on target, 50 X0 target 3 years with 107 muons per spill
See talk by R.G. Van de Water at PAC https://indico.fnal.gov/event/15726/session/3/material/0/0.pdf
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SBND Inelastic π0 SBND NCE Electron LSND E137 BaBar K +→π++invisible Electron/Muon g-2 J/ψ→invisible Relic Density MiniBooNE Direct Detection
10-2 10-1 1 10-13 10-12 10-11 10-10 10-9 10-8 10-7 10-6 mχ(GeV) Y=ϵ2α'(mχ/mV)4
mV=3mχ
αD=0.5
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beam dump will probe scalar relic density line.
electron (low mass) channels complement each other.
will improve DM search for masses > 50 MeV. Direct Detec0on Lower Limits g-2 anomaly
MiniBooNE
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funding for or finding a beam line + funding for a detector = challenge
Possibilities:
DASEL (SLAC), CEBAF (JLAB), SPS (CERN) Timelines are vague/fluid — there is a phase-1 and phase-2
Need to find time at FTBF , but beam line exists Only need a few months Could be engineering run for LDMX-e detector
Complementary to LDMX-e/μ in mass and couplings
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