Page 1
Long-lived charged particlesat FCC-hh and FCC-he
Sho IWAMOTO
Based on
hh: Jonathan L. Feng, SI, Yael Shadmi, Shlomit Tarem [1505.02996](collected in FCC-hh report [1606.00947])
he: Kechen Wang, SI, Monica D’Onofrio, Georges Azuelos [17??.?????](subgroup in BSM@ep collaboration)
2 Nov. 2017Seminar @ Tohoku University
Page 2
0. Collider Physics basic
1. LLCPs
2. Future colliders (FCC-hh and FCC-he)
3. LLCP searches at FCC-hh
4. LLCP searches at FCC-he
C o n t e n t s
Based on
hh: Jonathan L. Feng, SI, Yael Shadmi, Shlomit Tarem [1505.02996](collected in FCC-hh report [1606.00947])
he: Kechen Wang, SI, Monica D’Onofrio, Georges Azuelos [17??.?????](subgroup in BSM@ep collaboration)
/812
Page 3
0. Collider Physics basic
1. LLCPs
2. Future colliders (FCC-hh and FCC-he)
3. LLCP searches at FCC-hh
4. LLCP searches at FCC-he
C o n t e n t s
Based on
hh: Jonathan L. Feng, SI, Yael Shadmi, Shlomit Tarem [1505.02996](collected in FCC-hh report [1606.00947])
he: Kechen Wang, SI, Monica D’Onofrio, Georges Azuelos [17??.?????](subgroup in BSM@ep collaboration)
/813
Page 4
SUSY searches at the LHC : Nothing found
4 /81
Page 5
SUSY searches at the LHC : Nothing found
5 /81
Page 6
SUSY searches at the LHC : Nothing found
6 /81
"charm-tagging"
Page 7
SUSY searches at the LHC : Nothing found
7 /81
"charm-tagging" in
Page 8
SUSY searches at the LHC : Nothing found
8 /81
1705.04650 / ATLAS-CONF-2017-022
Page 9
SUSY searches at the LHC : Nothing found
9 /81
ATL-PHYS-PUB-2014-010https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsFPhttps://twiki.cern.ch/twiki/bin/view/AtlasPublic/UpgradePhysicsStudies
Page 10
SUSY searches at the LHC : Nothing found
10 /81
ATL-PHYS-PUB-2014-010https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsFPhttps://twiki.cern.ch/twiki/bin/view/AtlasPublic/UpgradePhysicsStudies
1705.04650 / ATLAS-CONF-2017-022
Page 11
Muon g-2 anomaly?
11 /81
Endo, Hamaguchi, SI, Yoshinaga [1303.4256]
SI, Yanagida, Yokozaki [1407.4226]Bino(LSP) , Wino, L/R-slepton, and stau masses are shown.
Endo, Hamaguchi, Ishikawa, SI, Yokozaki [1212.3935]
Page 12
Searches for electroweakino
12 /81
CMS Summary plot https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsSUSATLAS-CONF-2017-039
Page 13
CMS Summary plot https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsSUSATLAS-CONF-2017-039
Searches for electroweakino
13 /81
ATL-PHYS-PUB-2014-010https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsFPhttps://twiki.cern.ch/twiki/bin/view/AtlasPublic/UpgradePhysicsStudies
Page 14
Searches for electroweakino
14 /81
discovery@3000/fbcorresponding exclusion@36/fb
CMS Summary plot https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsSUS
ATL-PHYS-PUB-2014-010https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsFPhttps://twiki.cern.ch/twiki/bin/view/AtlasPublic/UpgradePhysicsStudies
Page 15
Searches for electroweakino
15 /81
discovery@3000/fbcorresponding exclusion@36/fb
ATLAS-CONF-2017-039
ATL-PHYS-PUB-2014-010https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsFPhttps://twiki.cern.ch/twiki/bin/view/AtlasPublic/UpgradePhysicsStudies
Page 16
0. Collider Physics basic
• What do "discovery" and "exclusion" mean?
• How do they distinguish "e" and "μ"?
C o n t e n t s
/8116
Page 17
0. Collider Physics basic
• What do "discovery" and "exclusion" mean?
• How do they distinguish "e" and "μ"?
C o n t e n t s
/8117
Page 18
0. Collider Physics basic
• What do "discovery" and "exclusion" mean?
blackboard
C o n t e n t s
/8118
Page 19
0. Collider Physics basic
• How do they distinguish "e" and "μ"?
C o n t e n t s
/81190 1 2 3 4 5 10 [m]
inner detectors(trackers)
calorimeters muon spectrometer
Ecal Hcal
Page 20
Figure from Groom, Mokhov, Striganov, Atom. Nucl. Data Tab. 78 (2001) 183-356[also in PDG Review “Passage of particles through matter”] /8120
Page 21
1. LLCPs
2. Future colliders (FCC-hh and FCC-he)
3. LLCP searches at FCC-hh
4. LLCP searches at FCC-he
C o n t e n t s
Based on
hh: Jonathan L. Feng, SI, Yael Shadmi, Shlomit Tarem [1505.02996](collected in FCC-hh report [1606.00947])
he: Kechen Wang, SI, Monica D’Onofrio, Georges Azuelos [17??.?????](subgroup in BSM@ep collaboration)
/8121
Page 22
Classes of Long-Lived Charged Particles (in Collider Experiments)
Particle property
➢ Heavy colored hadronize
➢ Heavy non-colored
➢ Light non-colored, milli-charged dedicated searches
Lifetime
R-hadron /stopping particles
m > O(100)GeV
➢ “stable” ➢ “in-flight decay”
/8122
Page 23
Why should we search for LLCP? — three viewpoints
experimental
➢ …why not?
➢ relevant for detector design
phenomenology
theoretical … SUSY?
➢ GMSB scenario: light gravitino long-lived sleptons
➢ split-SUSY: extremely heavy squarks long-lived gluino
long lifetime an actor in early Universe
non-standard DM/cosmology with LLCP next slides
FCC-hh will(?) cover most of thestandard thermal-WIMP scenario
From a talk by Phil Harris at FCC WEEK 2017
/8123
Page 24
Stable LLCPs in Cosmology
Dark Matter (especially to ameliorate DM over-abundance)
➢ co-annihilation
➢ super-WIMP scenario
Li problem
➢ MSSM with
Sato, Shimomura, Yamanaka [1604.04769]
Harigaya, Kaneta, Matsumoto [1403.0715],Ellis, Olive, Zheng [1404.5571], etc.
"Physics at the FCC-hh" Report [1606.00947]
/8124
Page 25
Super-WIMP:
➢ NLSP slepton + LSP gravitino
late-time decay
Super-WIMP scenario
frozen-out
SM
SM
thermal relic with
Feng, Rajaraman, Takayama [ph/0306024]
/8125
Page 26
Super-WIMP:
Super-WIMP scenario
(short-lived)
LLCP search target
(BBN/CMB constraintsare relevant.)
/8126
Page 27
Stable LLCPs in Cosmology
Dark Matter (especially to ameliorate DM over-abundance)
➢ co-annihilation
➢ super-WIMP scenario
Li problem
➢ MSSM with
Sato, Shimomura, Yamanaka [1604.04769]
Harigaya, Kaneta, Matsumoto [1403.0715],Ellis, Olive, Zheng [1404.5571], etc.
"Physics at the FCC-hh" Report [1606.00947]
/8127
Page 28
Stable LLCPs in Cosmology
Dark Matter (especially to ameliorate DM over-abundance)
➢ co-annihilation
➢ super-WIMP scenario
Li problem
➢ MSSM with
Sato, Shimomura, Yamanaka [1604.04769]
Harigaya, Kaneta, Matsumoto [1403.0715],Ellis, Olive, Zheng [1404.5571], etc.
"Physics at the FCC-hh" Report [1606.00947]
(as we see soon.)
non-colored LLCP… covered in this talk
(slepton / stau as benchmarks)
colored LLCP( hadronize: “R-hadron”)
/8128
Page 29
Models for “in-flight decay” LLCPs
Simple MSSM models
➢ Pure-Wino dark matter
➢ Pure-Higgsino dark matter
long-lived because of small δm
Other MSSM models
➢ Gauge-Mediation
➢ R-parity violation
mass10 TeV
1 TeV
all others
Same SU(2) multiplet mass degenerate
(
from EW loop corrections)
/8129
Page 30
Models for “in-flight decay” LLCPs
Simple MSSM models
➢ Pure-Wino dark matter
➢ Pure-Higgsino dark matter
long-lived because of small δm
Other MSSM models
➢ Gauge-Mediation
➢ R-parity violation
60mm
7mm
/8130
Page 31
Models for “in-flight decay” LLCPs
Simple MSSM models
➢ Pure-Wino dark matter
➢ Pure-Higgsino dark matter
long-lived because of small δm
Other MSSM models
➢ Gauge-Mediation
➢ R-parity violation
Beneke, Hellmann, Ruiz-Femenia [1411.6930]
(but DM underabundantfor “observable” region)
60mm
7mm
/8131
Page 32
Models for “in-flight decay” LLCPs
Simple MSSM models
➢ Pure-Wino dark matter
➢ Pure-Higgsino dark matter
long-lived because of small δm
Other MSSM models
➢ Gauge-Mediation (keV )
➢ R-parity violation
with -LSP
long-livedbecause of tiny couplings.
(but DM underabundantfor “observable” region)
60mm
7mm
/8132
Page 33
Models for “in-flight decay” LLCPs
Simple MSSM models
➢ Pure-Wino dark matter
➢ Pure-Higgsino dark matter
long-lived because of small δm
Other MSSM models
➢ Gauge-Mediation (keV )
➢ R-parity violation
with -LSP
long-livedbecause of tiny couplings.
(but DM underabundantfor “observable” region)
60mm
7mm
for Gauge-Mediation: “gravity is weak”,
for R-parity violation: “if RpV is tiny”.any cτ
/8133
Page 34
Models for “in-flight decay” LLCPs
Simple MSSM models
➢ Pure-Wino dark matter
➢ Pure-Higgsino dark matter
long-lived because of small δm
Other MSSM models
➢ Gauge-Mediation (keV )
➢ R-parity violation
with -LSP
long-livedbecause of tiny couplings.
(but DM underabundantfor “observable” region)
60mm
7mm
any cτ
Summary of motivations
34
Dark Mattter
➢ co-annihilation
➢ super-WIMP scenario
Li problem
➢ MSSM with
/8134
Page 35
1. LLCPs
➢ Introduction & Motivations
➢ How to search? & Current bounds
2. Future colliders (FCC-hh and FCC-he)
3. LLCP searches at FCC-hh
4. LLCP searches at FCC-he
C o n t e n t s
Based on
hh: Jonathan L. Feng, SI, Yael Shadmi, Shlomit Tarem [1505.02996](collected in FCC-hh report [1606.00947])
he: Kechen Wang, SI, Monica D’Onofrio, Georges Azuelos [17??.?????](subgroup in BSM@ep collaboration)
/8135
Page 36
How to search for non-colored LLCP?
(1) “stable” non-colored LLCPs
p p
/8136
Page 37
How to search for non-colored LLCP?
(1) “stable” non-colored LLCPs
p p
/8137
Page 38
How to search for non-colored LLCP?
(1) “stable” non-colored LLCPs
p p
/8138
Page 39
0 1 2 3 4 5 10 [m]
inner detectors(trackers)
calorimeters muon spectrometer
hadron
Ecal Hcal
light
“stable” muon-like but heavy
/8139
Page 40
mass measurement = p & β measurements
“Stable” LLCPs = muon detection + mass measurement
momentum & velocity
➢momentum ➢ velocity
• TOF [time-of-flight]
• dE/dx [ionization energy loss]
/8140
Page 41
mass measurement = p & β measurements
“Mass measurement” to distinguish long-lived sleptons
momentum & velocity
➢momentum ➢ velocity
• TOF [time-of-flight]
• dE/dx [ionization energy loss]
ATLAS muon data: Δβ = 2.4%
/8141
Page 42
LLCP searches at LHC Run 2 CMS-PAS-EXO-16-036 / 1606.05129
/8142
Page 43
LLCP searches at LHC Run 2
Drell-Yan only:
incl. cascade decay(assuming some GMSB model)
360 660 1200 1700–1800 /8143
Page 44
HL-LHC
current HL-LHC
gluino: 1.7 TeV 2.2 TeV?
stop: 1.2 TeV 1.7 TeV?
stau (GMSB): 660 GeV 1.2 TeV?
stau (DY): 360 GeV 1.0 TeV?
CMS-PAS-EXO-14-007 (sept. 2016)
(or discovery?)
/8144
Page 45
How to search for non-colored LLCP?
(2) “in-flight decay” non-colored LLCPs
p p
/8145
Page 46
How to search for non-colored LLCP?
(2) “in-flight decay” non-colored LLCPs
p p
/8146
Page 47
How to search for non-colored LLCP?
(2) “in-flight decay” non-colored LLCPs
p p
/8147
Page 48
How to search for non-colored LLCP?
(2) “in-flight decay” non-colored LLCPs
p p
“in-flight decay” LLCPs= disappearing tracks
/8148
Page 49
Current LHC bounds
[ns]t
1-10 1 10
[GeV
]1± c~
Low
er li
mit
on m
100
200
300
400
500
600
700
800
900
1000Expected limits
Observed limits Eur. Phys. J. C (2015) 75:407Pixel dE/dx
Phys. Rev. D 88, 112006 (2013)Disappearing track
JHEP 01 (2015) 068Stable charged
ATLAS-CONF-2017-017Disappearing track (pixel-only)
95% CL limits.
not includedtheorySUSYs
=8 TeVs, -118.4-20.3 fb
=13 TeVs, -136 fb
PreliminaryATLAS
Status: March 2017]0
W~
[~1
0c~ ±p ® ]
±W~
[~1
±c~
=1)gb=0, h(r for Inner Detector Calo MS
Sta
ble
[m]tc
2-10 1-10 1 10
/8149
Page 50
1. LLCPs
➢ Introduction & Motivations
➢ How to search? & Current bounds
2. Future colliders (FCC-hh and FCC-he)
3. LLCP searches at FCC-hh
4. LLCP searches at FCC-he
C o n t e n t s
Based on
hh: Jonathan L. Feng, SI, Yael Shadmi, Shlomit Tarem [1505.02996](collected in FCC-hh report [1606.00947])
he: Kechen Wang, SI, Monica D’Onofrio, Georges Azuelos [17??.?????](subgroup in BSM@ep collaboration)
/8150
Page 51
FCC-hh
27 km, 8.3 T, beam = 7 TeV
FCC-hh80–100 km, ~16 T, beam = 50 TeV
(FCC-ee as a potential first step)
CDR in 2018
* HE-LHC27 km, 16 Tbeam = 13.5 TeV
[conceptual design report]
/8151
Page 52
25
FCC Study Status and Plans
Michael Benedikt
3rd FCC Week, Berlin, 29 May 2017
Draft Schedule Considerations
20 22 24 26 28 30 32 34 38 40
Civil Engineering FCC-hh ring
Dipole short models
16 T dipole indust. prototypes
16 T dipoles preseries
16 T series productionSC
Mag
net
s
CE FCC-ee ring + injector
FC
C-h
hF
CC
-ee
HE
-LH
C
Strategy Update 2026 – assumed project decision
Installation HE-LHC
LHC Modification
42
Technical Design Phase
36
Installation + test FCC-ee
Installation + test FCC-hh
CE TL to LHC
LHC Removal
Dipole long models
Injector
FCC-hh
From M. Benedikt’s talk @ 3rd FCC Week, 29 May 2017
Magnet R&D: 20+ years
/8152
Page 53
FCC-he
from “Energy Recovery Linacs”
LHC + e- beam = LHeC
FCC-hh + e- beam = FCC-he
/8153
Page 54
Active toward CDR
Mar 2015 : FCC week 2015 @ Washington D.C.
Apr 2016 : FCC week 2016 @ Rome
Jan 2017 : FCC physics workshop @ CERN
May 2017 : FCC week 2017 @ Berlin
Sep 2017 : LHeC/FCC-eh workshop @ CERN
Jan 2018 : FCC physics workshop @ CERN
Apr 2018 : FCC week 2018 @ Amsterdam
/8154
Page 55
1. LLCPs
➢ Introduction & Motivations
➢ How to search? & Current bounds
2. Future colliders (FCC-hh and FCC-he)
3. LLCP searches at FCC-hh
4. LLCP searches at FCC-he
Based on
hh: Jonathan L. Feng, SI, Yael Shadmi, Shlomit Tarem [1505.02996](collected in FCC-hh report [1606.00947])
he: Kechen Wang, SI, Monica D’Onofrio, Georges Azuelos [17??.?????](subgroup in BSM@ep collaboration)
/8155
Page 56
LLCPs at FCC-hh LLCPs at LHC
➢ same production mechanism; just with a higher energy.
e.g., Drell–Yan process (or from cascade decay)
➢ same detection method.
“in-flight decay” disappearing track.
“stable” muon-like track + β measurement (heavy = slow)
➢ Two extras:
muon radiative energy loss
LLCP momentum resolutions
LLCPs at FCC-hh
[R. Sawada’s talk in FCC week 2017]
5σ @2.6 TeV Wino
/8156
Page 57
LLCPs at FCC-hh LLCPs at LHC
➢ same production mechanism; just with a higher energy.
e.g., Drell–Yan process (or from cascade decay)
➢ same detection method.
“in-flight decay” disappearing track.
“stable” muon-like track + β measurement (heavy = slow)
➢ Two extras:
muon radiative energy loss
LLCP momentum resolutions
LLCPs at FCC-hh
[R. Sawada’s talk in FCC week 2017]
5σ @2.6 TeV Wino
/8157
Page 58
Figure from Groom, Mokhov, Striganov, Atom. Nucl. Data Tab. 78 (2001) 183-356[also in PDG Review “Passage of particles through matter”]
Muon energy loss in matter
/8158
Page 59
Figure from Groom, Mokhov, Striganov, Atom. Nucl. Data Tab. 78 (2001) 183-356[also in PDG Review “Passage of particles through matter”]
Muon energy loss in matter
➢ Bremsstrahlung
➢ Photonuclear interaction
➢ e+ - e− pair-production
Muon radiative energy loss
/8159
Page 60
Muon energy loss in “calorimeter”
“calorimeter”: approximated by iron (Fe) with 3m thickness.
some of μ (PT > 500 GeV): > 30 GeV energy deposit.
Feng, SI, Shadmi, Tarem [1505.02996]
[Simulated with GEANT 4]
/8160
Page 61
Assumptions
Detector
➢ similar to ATLAS/CMS
➢ β-resolution same as ATLAS(resolution: 2.4%)
Signal: Madgraph5 +Pythia6 + Delphes3
(calculated at the LO)
BKG: “Snowmass 2013”BKG set for 100TeV
Pile-up not considered
-selection flow
Event selection
Feng, SI, Shadmi, Tarem [1505.02996]
/8161
Page 62
SR
signalSM BKG
LLCP selection flow
Event categorization
Result: cut flow
-selection flow
Event selection
Eloss reduces 34% of BKG
Feng, SI, Shadmi, Tarem [1505.02996]
/8162
Page 63
Result: Expected exclusion limit Feng, SI, Shadmi, Tarem [1505.02996]
/8163
Page 64
Result: Expected exclusion limit
mixing-angle dependence
Feng, SI, Shadmi, Tarem [1505.02996]
/8164
Page 65
Result: Expected exclusion limit
mixing-angle dependence
Feng, SI, Shadmi, Tarem [1505.02996]
/8165
Page 66
LLCPs at FCC-hh LLCPs at LHC
➢ same production mechanism; just with a higher energy.
e.g., Drell–Yan process (or from cascade decay)
➢ same detection method.
“in-flight decay” disappearing track.
“stable” muon-like track + β measurement (heavy = slow)
➢ Two extras:
muon radiative energy loss
LLCP momentum resolutions
LLCPs at FCC-hh
[Ryu Sawada’s talk in FCC week 2017]
5σ @2.6 TeV Wino
/8166
Page 67
Momentum resolution for very-large pT
ATLAS 7 TeV results on muon momentum resolution
ATLAS [1404.4562]; see also [1201.4704]
Inner Detector, |η|<1.05 Muon Spectrometer
/8167
Page 68
Result: LLCP histogram on mass Feng, SI, Shadmi, Tarem [1505.02996]
FCC-hh trk. goal: 10–20% @ 10 TeV(Michele Selvaggi’s talk in FCC physics workshop )
cf. ATLAS 7 TeV commissioning:
(ID-barrel, MS-barrel, MS-extbarrel) = (38%, 14%, 6%) @ 1 TeV
(too optimistic)
/8168
Page 69
Result: LLCP histogram on mass Feng, SI, Shadmi, Tarem [1505.02996]
(too pessimistic?)
FCC-hh trk. goal: 10–20% @ 10 TeV(Michele Selvaggi’s talk in FCC physics workshop )
cf. ATLAS 7 TeV commissioning:
(ID-barrel, MS-barrel, MS-extbarrel) = (38%, 14%, 6%) @ 1 TeV
/8169
Page 70
Summary: LLCPs at FCC-hh
100 TeV FCC-hhmass reach
“Muon radiative energy loss”
➢ Bremsstrahlung
➢ Photonuclear interaction
➢ e+-e- pair-production
34% of BKG reduction
0.3ab−1 1ab−1 3ab−1
Exclusion 1.8–2.3 2.4–3.1 3.2–4.0
Discovery 1.6–2.2 2.3–3.0 3.1–4.0 in TeV
/8170
Page 71
1. LLCPs
➢ Introduction & Motivations
➢ How to search? & Current bounds
2. Future colliders (FCC-hh and FCC-he)
3. LLCP searches at FCC-hh
4. LLCP searches at FCC-he
Based on
hh: Jonathan L. Feng, SI, Yael Shadmi, Shlomit Tarem [1505.02996](collected in FCC-hh report [1606.00947])
he: Kechen Wang, SI, Monica D’Onofrio, Georges Azuelos [17??.?????](subgroup in BSM@ep collaboration)
/8171
Page 72
FCC-he for…
FCC-he targets:
➢ PDFs & strong coupling
➢ Higgs & Electroweak physics
➢ QCD (heavy quark PDFs)
➢ low-x physics (non-linear QCD?) : x < 10-6
What’s MORE?Any power to New Physics? BSM ep team
Figures from Jan Kretzschmar’s and Paul Newman’s talks in LHeC and FCC-eh Workshop, Sep. 2017
/8172
Page 73
FCC-he for…
BSM ep team
[from a talk by Kechen Wang @ FCC week 2017]
/8173
Page 74
Models for “in-flight decay” LLCPs
Simple MSSM models
➢ Pure-Wino dark matter
➢ Pure-Higgsino dark matter
long-lived because of small δm
Other MSSM models
➢ Gauge-Mediation (keV )
➢ R-parity violation
with -LSP
long-livedbecause of tiny couplings.
(but DM underabundantfor “observable” region)
60mm
7mm
any cτ
Models for “in-flight decay” LLCPs @ FCC-he
74
Dark Mattter
➢ co-annihilation
➢ super-WIMP scenario
Li problem
➢ MSSM with
/8174
Page 75
Simplest models: 4-body production; … (´・ω・`)
➢ Pure-Wino / Pure-Higgsino LSP
➢ Slepton LSPdisappearing track (or “kink”)
R-parity violation orgravitational interaction
disappearing track
degenerate in mass
However, the simplest scenarios have tiny cross sections; less promising than LHC.
/8175
Page 76
Introducing co-LSP allows 3-body production
➢ Pure-Wino / Pure-Higgsino LSP + left-handed selectron
➢ Slepton LSP + Bino (or Wino)
If one more SUSY particles are as light as the LSP, the production greatly enhances.
/8176
Page 77
Nominal production cross section (without acceptances /
efficiencies)
With no polarization.
Shaded region is excluded by ATLAS (13TeV, 36/fb)
“3-body” model assumes 9 GeV
With 3-body prod., FCC-he may compete w/ LHC. ( good for verification of FCC-hh)
LHeC; 3-bodyLHeC; 4-body
FCC-he; 4-body (pure-Wino)
FCC-he; 3-body (pure-Wino + L-selec.)
LHC14
x30
excluded by ATLAS
/8177
Page 78
Nominal production cross section (without acceptances /
efficiencies)
With no polarization.
“3-body” model assumes
With 3-body prod., FCC-he may compete w/ LHC. ( good for verification of FCC-hh)
LHeC; 3-body
FCC-he; 4-body (right-handed slepton)
LHC14
x100
/8178
Page 79
FCC-he in-flight decay LLCPs with reconstruction efficiency
LLCPs are required to decay after 3 layers of IDs.(=~ to leave 3 hits in ID)
Higgsino-only scenario: less promising because of smaller cτ.
• “Wino+slep” model is promising.• reco eff. is governed by the innermost layers
closer / more-precise layers would help a lot.
With no polarization.
Shaded region is excluded by ATLAS (13TeV, 36/fb)
“3-body” process assumes 9 GeV.
FCC-he; 4-body (pure-Wino)
FCC-he; 3-body (pure-Wino + L-selec.)
/8179
Page 80
Models for “in-flight decay” LLCPs
Simple MSSM models
➢ Pure-Wino dark matter
➢ Pure-Higgsino dark matter
long-lived because of small δm
Other MSSM models
➢ Gauge-Mediation (keV )
➢ R-parity violation
with -LSP
long-livedbecause of tiny couplings.
(but DM underabundantfor “observable” region)
60mm
Summary of in-flight decay LLCP searches @ FCC-he
80
Dark Mattter
➢ co-annihilation
➢ super-WIMP scenario
Li problem
➢ MSSM with
-->
any cτ
7mm
lifetime too short trying to improve by
identifying daughter particles…
“single SUSY particle”
tiny σ due to 4-body process; HL-LHC will be better.
If with another sparticle for3-body “co-production”
FCC-he will be competitivewith HL-LHC.
➢ Pure-Wino LSP +
➢ Slepton LSP + Bino (or Wino)
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Summary: LLCPs at FCC-hh
100 TeV FCC-hhmass reach
“Muon radiative energy loss”
➢ Bremsstrahlung
➢ Photonuclear interaction
➢ e+-e- pair-production
34% of BKG reduction
0.3ab−1 1ab−1 3ab−1
Exclusion 1.8–2.3 2.4–3.1 3.2–4.0
Discovery 1.6–2.2 2.3–3.0 3.1–4.0 in TeV
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