GGM1.5 SRee# - CERNR BR(τ 0 0.2 0.4 0.6 0.8 1) L τ BR(0 0.1 0.2 0.3 0.4 0.5 λ i3k = -λ 3ik 0 →...
Transcript of GGM1.5 SRee# - CERNR BR(τ 0 0.2 0.4 0.6 0.8 1) L τ BR(0 0.1 0.2 0.3 0.4 0.5 λ i3k = -λ 3ik 0 →...
GGM 1.5 SR ee
Emma Torró
(on behalf of the ATLAS Collabora;on)
Univ. of Washington -‐ SeaDle
Searches for R-‐Parity viola;ng SUSY with lepton number viola;on
SUSY 2015
Lake Tahoe, USA
28 August 2015 1
Introduc;on
2
R = (-‐1)3(B – L) +2s = +1 for SM par:cles -‐ 1 for SUSY par:cles
• In this talk only Lepton Flavour Viola;ng terms (LFV) are considered.
For BNV see next talk by B. Jackson
�̃±1
�̃01p
p
✏
`
b
b✏
`
W
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
bilinear RPV terms (bRPV)
LLE terms
LQD terms
• Lepton (L) and baryon (B) number viola;on are experimentally constrained but not forbidden by any fundamental reason. • Standard SUSY searches assume R-‐Parity Conserva;on (RPC). • Introducing non-‐zero RPV couplings ! rich phenomenology, can weaken mass and cross-‐ sec;on limits from collider experiments.
Introduc;on • This talk presents the latest results from the ATLAS experiment:
• 20 ]-‐1 of pp LHC collision data at 8 TeV • searches for RPV SUSY with LSPs decaying promptly through LFV couplings for:
• Reinterpreta;on in terms of LFV-‐RPV of searches originally developed to target RPC models. • This talk will focus more on the model descrip;on and interpreta;on of final results than on the analyses. 3
Simplified models pMSSM Ref.
Analysis short name
LLE (g̃g̃)
LQD (g̃g̃)
LQD (q̃q)̃
LLE + LQD
bRPV
4L ✓ Phys. Rev. D. 90, 052001 (2014)
SS/3L ✓ ✓ JHEP 06 (2014) 035
1L ✓ ✓ Phys. Rev. LeD. 114, 161801 (2015)
0L 2-‐6 jets ✓ ✓ JHEP 09 (2014) 176
0L 7-‐10 jets ✓ J. High Energy Phys. 10 (2013) 130
eμ, eτ, μτ ✓ Phys. Rev. LeD. 115, 031801 (2015)
B-‐L (Not covered in this talk. See backup for summary) ATLAS-‐CONF-‐2015-‐015
RPV summary pape
r:
ATLAS-‐CO
NF-‐2015-‐018
• Dedicated analysis searching for heavy resonances
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
RPV summary paper
4 Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
5
4L SS/3L 1L 0L
≥ 4 leptons (≥ 2 e or μ) no jet selec;on
• DZ, ZZ (MC) • Non-‐prompt and fake leptons (data driven)
• Good agreement between expected and observed events in VRs and in SRs in all analyses.
2 SS OR 3 leptons 0 – 3 b-‐jets
• Dbar and W+jets (Normalize MC to data in CRs)
• W+jets, Dbar + single top, Z(νν) + jets, mul;jets. (Normalize MC to data in CRs)
g̃
g̃
�̃01
�̃01
p
p
q q
�00
q
q q
�00
q
• mul;jets (matrix method) • Dbar and W+jets (Normalize MC to data in CR) • Z+jets, DV, st (MC)
1 lepton 3 – 6 jets
no iso leptons ≥ 5 -‐ 6 jets pT(jet1) >160 GeV
no iso leptons 7 -‐ 10 jets pT > 50 or 80 GeV
• See more details on every analysis in backup slides
Analyses considered for the RPV summary paper ATLAS-‐CONF-‐2015-‐018
[GeV]TmissE
250 300 350 400 450 500 550
Even
ts /
100
GeV
0
5
10
15
20
25ATLAS
-1=8 TeV, 20.3 fbsµhard 1L e/
6-jet SR
DataStandard ModelTop QuarksV+jetsFake LeptonsDibosons
)=01χ∼, ±
1χ∼, g~ 1-step, m(g~g~
(1025, 545, 65) GeV
• DW, DZ WW, WZ, ZZ + jets (MC) • Fake leptons, charge-‐flip (data-‐driven)
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
)RτBR(0 0.2 0.4 0.6 0.8 1
) LτBR
(
0
0.1
0.2
0.3
0.4
0.53ikλ = -i3kλ
ν-l+ l→ 0
1χ∼
ν
±
τ± l→ 01χ∼
ijkλ
ν-l+ l→ 0
1χ∼
3i3λ = -i33λ
ν
±
τ± l→ 01χ∼
ν-τ+τ → 01χ∼
ij3λ
ν
±
τ± l→ 01χ∼
GluinoELL {1,2}∈i,j,k
per
eve
ntµ
Mea
n nu
mbe
r of e
+
1
1.5
2
2.5
3
3.5
4
per
eve
ntµ
Mea
n nu
mbe
r of e
+
1
1.5
2
2.5
3
3.5
4
)Rτ →BR(LSP 0 0.2 0.4 0.6 0.8 1
) Lτ →
BR(L
SP
0
0.1
0.2
0.3
0.4
0.5 GluinoELL
Models: LLE terms
LLE couplings with 1st-‐ and 2nd-‐genera;on leptons dominate
LLE couplings with 3rd-‐genera;on leptons dominate
• Simplified model: neutralino LSP decays into two charged leptons and a neutrino • All possible combina;ons of e, μ, τ simulated with LSP BRs varying among 4 extreme cases (l = e, μ):
at least 4 light leptons
at least 2 light leptons
6
(100%) (100%)
(50%)
(50%)
(50%)
(50%)
g̃
g̃
�̃01
�̃01
p
p
q q
�
`
`
⌫
q q
�
`
`
⌫
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
)RτBR(0 0.2 0.4 0.6 0.8 1
) LτBR
(
0
0.1
0.2
0.3
0.4
0.53ikλ = -i3kλ
ν-l+ l→ 0
1χ∼
ν
±
τ± l→ 01χ∼
ijkλ
ν-l+ l→ 0
1χ∼
3i3λ = -i33λ
ν
±
τ± l→ 01χ∼
ν-τ+τ → 01χ∼
ij3λ
ν
±
τ± l→ 01χ∼
GluinoELL {1,2}∈i,j,k
Models: LLE terms
• Simplified model: neutralino LSP decays into two charged leptons and a neutrino • All possible combina;ons of e, μ, τ simulated with LSP BRs varying among 4 extreme cases (l = e, μ):
7
(100%) (100%)
(50%)
(50%)
(50%)
(50%)
g̃
g̃
�̃01
�̃01
p
p
q q
�
`
`
⌫
q q
�
`
`
⌫
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
• Each simulated LLE and LQD sample is generated with a fixed mass ra;o:
• R determines how the available energy is shared between the final-‐state objects
Lower R souer LSP decay products more energe;c par;cles from the NLSP decays
• May affect the choice of the best-‐performing signal region for a given model.
Results on LLE
• Lower limits on the gluino mass for R=0.9, set from: • 4L analysis (SR0noZb: at least 4 light leptons): strongest limits: m(g̃) > 1350 GeV • SS/3L analysis (SR3Lhigh: at least 3 light leptons): weaker limits: m(g̃) > 1140 GeV • Combina;on 4L + SS/3L • Limits weaken as the number of light leptons per event decreases
)RτBR(0 0.2 0.4 0.6 0.8 1
) LτBR
(
0
0.1
0.2
0.3
0.4
0.5
SS3Lboth
4L
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs ν-l+ l→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.9g~) / m(01χ∼m(
GluinoELL
Obs
erve
d M
ass
Exclu
sion
[GeV
]
1150
1200
1250
1300
1350
)RτBR(0 0.2 0.4 0.6 0.8 1
) LτBR
(
0
0.1
0.2
0.3
0.4
0.5
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs ν-l+ l→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.9g~) / m(01χ∼All limits at 95% CL m(
GluinoELL
8
ATLAS-‐CONF-‐2015-‐018
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
• Cases R=0.1, 0.5 similar results, see backup.
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1ij3' λ
qb± l→ 01χ∼
qbν → 01χ∼
ijk' λqq'± l→ 0
1χ∼
qq'ν → 01χ∼
3j3' λqb±τ → 0
1χ∼
qbν → 01χ∼
3jk' λqq'±τ → 0
1χ∼
qq'ν → 01χ∼
SquarkD Gluino, LQDLQ {1,2}∈i,j,k
9
(50%) (50%)
(50%)
(50%)
(50%)
(50%)
(50%) (50%)
• 2 Simplified models: LQD gluino; LQD squark: neutralino LSP decays into two quarks and a lepton
• A specific λ’ijk allows and
€
˜ χ 10 →ℓ iu jdk
€
˜ χ 10 →ν id jdk
g̃
g̃
�̃01
�̃01
p
p
q q
�0
q
`/⌫
q
q q
�0
`/⌫
q
q
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
Models: LQD terms
• All possible combina;ons of e, μ, τ simulated with LSP BRs varying among 4 extreme cases:
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
0L 7-10 jetsj50
j50 + j80
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.5g~) / m(01χ∼m(
GluinoDLQ
Obs
erve
d M
ass
Exclu
sion
[GeV
]
102010401060108011001120114011601180120012201240
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.5g~) / m(01χ∼All limits at 95% CL m(
GluinoDLQ
• Model nominally produces 8 jets ! strongest constraints for R=0.1, 0.5 set by 0L + 7-‐10 jets analysis: m(g̃) > 1180 GeV • Sta;s;cal combina;on of SR with/without b-‐jets ! mass limits shows dependence on BR(b) • Veto on light leptons ! weaker limits in low BR(τ)
• R=0.9: compressed SUSY spectrum ! 0L + 7-‐10 no longer produces best results. • More powerful results for 1L and 0L + 2-‐6 jets analyses. See backup. 10
Results on LQD gluino ATLAS-‐CONF-‐2015-‐018
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
R=0.5
Obs
erve
d M
ass
Exclu
sion
[GeV
]
9209409609801000102010401060108011001120
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼q0
1χ∼ q→ q~q~ →pp
) = 0.5q~) / m(01χ∼All limits at 95% CL m(
SquarkDLQ
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
1L both
0L 2-6 jets6jt+
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼q0
1χ∼ q→ q~q~ →pp
) = 0.5q~) / m(01χ∼m(
SquarkDLQ
• Model nominally produces 6 jets ! strongest constraints set by: • 1L for BR(τ) < 0.1: m(g̃) > 1120 GeV • 0L + 2-‐6 jets analysis for BR(τ) > 0.3: m(g̃) > 1050 -‐ 920 GeV • combina;on of both in BR(τ) = (0.1, 0.3): m(g̃) > 1060 – 980 GeV
• No dependency on BR(b) since neither analysis requires/vetoes on b-‐jets. • Similar result obtained for R=0.9 (see backup).
11
R=0.5
Results on LQD squark ATLAS-‐CONF-‐2015-‐018
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
)+ 1χ∼ b
→ 1t~
BR(
00.10.20.30.40.50.60.70.80.91
[GeV]µ
200 250 300 350 400 450 500 550 600
[GeV
]L,
3q~
m
400
500
600
700
800
900
1000
1100
1200 )+ 1χ∼ b
→ 1t~
BR(
00.10.20.30.40.50.60.70.80.91
ATLAS Preliminary
Natural bRPV pMSSM
• ATLAS searches have set limits on mSUGRA bRPV: m(g) ≥ 1.35 TeV, comparable to RPC limits.
• Here first ;me to explore bRPV Natural SUSY: • t̃ and higgsinos mass < 1 TeV • Other masses: less stringent constraints survive previous limits
• phenomenological MSSM (pMSSM) compa;ble with: • Observed Higgs mass • Measurements of ν oscilla;ons • Main produc;on processes: t̃ t̃ , χ0̃, χ±̃
• Free parameters: • μ (higgsino mass parameter) • mq̃L,3 (leu-‐ handed top and boDom squarks mass ! light for naturalness).
• See further details in backup.
t1 b l ~
t1 t χ01,2
~ ~
t1̃ b χ± 1,2 ~
t1 = LSP ~
Models: bRPV terms
12
t̃
t̃
�̃±1�̃0
1
p
p✏
b ⌫
W
✏
t
⌫
b
b
�̃±1
�̃01p
p
✏
`
b
b✏
`
W
€
€
˜ χ 1± → lbb ≈ 60%
€
˜ χ 10 →Wl ≈ 60%Explored region:
large lepton and b-‐jet mul;plicity
~
χ0, χ± masses increase ~ ~
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
Results on bRPV
[GeV]µ420 440 460 480 500 520 540 560
[GeV
]L,
3q~
m
650
700
750
800
850
900
950 = 1.7 TeVgluino, mµ = 32 = 30, MβNatural bRPV pMSSM: tan
)theorySUSYσ1 ±Observed limit (
)expσ1 ±Expected limit (
All limits at 95% CL
(450
GeV
)0 1χ∼
(500
GeV
)0 1χ∼
(550
GeV
)0 1χ∼
(550 GeV)1t~
(560 GeV)1t~
(570 GeV)1t
~
(580 GeV)1t
~
(580 GeV)1t~
(570 GeV)1t~
(560 GeV)1t~
(550 GeV)1t
~
) + m(t)±
1χ∼
) < m(1b~m(
decays1t~RPV
ATLAS Preliminary = 8 TeVs, -1 L dt = 20.3 fb∫
)theorySUSYσ1 ±Observed limit (
)expσ1 ±Expected limit (
All limits at 95% CL
13
• Strongest constraints set by SR3b in the SS/3L analysis along the en;re plane. • Limit weakens as mq̃L,3 increases due to:
• Contribu;on from b"1 pair produc;on is cri;cal: large meff difficult to produce from t1̃ decays when t1̃ and χ±̃1 degenerate • Increasing b"1 mass, and corresponding decrease in the b"1 b"1 produc;on cross-‐sec;on.
• For mq̃L,3 = 800 GeV, en;re range of μ excluded.
• Lower limits of μ < 455 GeV and mq̃L,3 > 810 GeV within explored region.
ATLAS-‐CONF-‐2015-‐018
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
14
eμ, eτ, μτ resonances
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
Heavy resonances
• Aiming RPV combined LLE + LQD terms • Selec;on:
• Trigger on 1 or 2 leptons (e or μ) • 0 or 1 τhad candidates with 1 prong • Exactly 2 leptons with OSDF • Leptons back to back (Δϕ > 2.7) • mll > 200 GeV (mll < 200 GeV used as VR)
• Main backgrounds: • 2 prompt leptons:
Z/γ* -‐> ττ, Dbar, st Wt channel, dibosons Es;mated using MC
• Jets misiden;fied as leptons (fakes): W+ jets, mul;jets Es;mated normalizing MC to data in CRs
• Good agreement between expected and observed events in VRs and in SRs. 15
Phys. Rev. LeD. 115, 031801 (2015)
Even
ts /
20 G
eV
1−10
1
10
210
310
410
510 Data (1 TeV)τν
∼
ττ →Z Others
Z' (0.75 TeV)Jet fakettTotal SM
-1 = 8 TeV, 20.3 fbsATLAS
µe
Dilepton Mass [GeV]0 200 400 600 800 1000 1200Da
ta/S
M
12
• Dedicated search for the decay of a heavy neutral par;cle into a pair of different flavor leptons via LFV couplings.
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
Models: LQD + LLE terms
16
• Simplified model: tau sneutrino (ν̃τ) LSP decays to eμ, eτ, μτ
• In this case RPV couplings are present both at the produc;on and at the decay vertex.
• Only tau sneutrino is considered here in order to compare with previous searches performed at the Tevatron, but... • The results of this analysis apply to any sneutrino flavour.
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
Results on LLE + LQD
17
[GeV]τν∼m
500 1000 1500 2000 2500 3000)[
fb]
τµ/τ
/eµ
BR
(e×
σ 1
10
210
310
410
-1 = 8 TeV, 20.3fbsATLASµ e→ τν∼
[GeV](Z')τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τ
µ/τ/e
µ B
R(e
× σ
1−10
1
10
210
310
410 µ e→Z' [GeV]τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τ
BR
(e×
σ
1
10
210
310
410
Theory
95% CL Observed limit
95% CL Expected limit
σ1 ±95% CL Expected limit
σ2 ±95% CL Expected limit
τ e→ τν∼
[GeV](Z')τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τ
BR
(e×
σ
1−10
1
10
210
310
410τ e→Z' [GeV]
τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τµ
BR
(×
σ
1
10
210
310
410
τµ → τν∼
[GeV](Z')τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τµ
BR
(×
σ
1−10
1
10
210
310
410τµ →Z'
[GeV]τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τ
µ/τ/e
µ B
R(e
× σ 1
10
210
310
410
-1 = 8 TeV, 20.3fbsATLASµ e→ τν∼
[GeV](Z')τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τ
µ/τ/e
µ B
R(e
× σ
1−10
1
10
210
310
410 µ e→Z' [GeV]τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τ
BR
(e×
σ
1
10
210
310
410
Theory
95% CL Observed limit
95% CL Expected limit
σ1 ±95% CL Expected limit
σ2 ±95% CL Expected limit
τ e→ τν∼
[GeV](Z')τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τ
BR
(e×
σ
1−10
1
10
210
310
410τ e→Z' [GeV]
τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τµ
BR
(×
σ
1
10
210
310
410
τµ → τν∼
[GeV](Z')τν∼m
500 1000 1500 2000 2500 3000
)[fb
]τµ
BR
(×
σ
1−10
1
10
210
310
410τµ →Z'
• Theore;cal predic;ons of σ x BR: assuming λ’311 = 0.11 and λi3k = 0.07 • Lower limits on the ν̃τ mass are 2.0 TeV, 1.7 TeV, and 1.7 TeV for eμ, eτ and μτ channels.
• The observed lower mass limits are a factor of 3 – 4 higher than the best limits from the Tevatron and also more stringent than the previous limits from ATLAS for the same couplings.
Phys. Rev. LeD. 115, 031801 (2015)
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015 • Not a reinterpreta;on! Dedicated search for this model
Summary
18
• R-‐parity viola;on can be a cause of non-‐discovery in general searches for new physics at LHC. • A variety of RPV scenarios are tested either by dedicated searches or by reinterpre;ng previously published ATLAS searches.
• LLE and LQD cases: • Limits on produc;on cross-‐sec;on and spar;cle masses obtained for different LSP mass hypotheses as a func;on of the LSP BRs to boDom quarks and tau leptons.
• Bilinear R-‐parity viola;on in natural pMSSM: • Reinterpreta;on of previous ATLAS searches (SS/3L dominant) • μ = (160, 455) GeV excluded at 95%CL; mq̃L,3 = 800 GeV excluded up to μ = 560 GeV • Limits in natural SUSY with bRPV complement previous studies of mSUGRA model.
LLE LQD gg qq
LLE + LQD
Dominant analysis SS/3L 1L / 0L 1L / 0L eμ, eτhad, μτhad
mass limit m(g̃) > 1040 – 1400 GeV
m(g̃) > 910 -‐ 1220 GeV
R > 0.1: m(g̃) > 910 -‐ 1280 GeV
m(ν̃τ) > (2.0, 1.7, 1.7) TeV for (eμ, eτ, μτ)
reinterpreta;on of previous ATLAS searches dedicated ATLAS search
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
19
Backup
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
Search method
20 Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
[GeV]effm
0 200 400 600 800 1000 1200 1400
Eve
nts
/ 2
50
Ge
V
-210
-110
1
10
210
310
= 8 TeVs-1
L dt = 20.3 fb∫ATLAS Data 2012 Total SM
Reducible ZZ
Ztt tWZ
Higgs VVV
)=(600,400) GeV0
1χ∼,±
1χ∼0, m(≠121λ,
-
1χ∼
+
1χ∼
SR0noZb
• Aiming RPC and RPV with LLE terms
• Selec;on: • ≥ 4 leptons (at least two of them e or μ) • Veto on Z-‐>ll (orthogonal SRs contain Zs) • No jet selec;on: valid for strong and EW
• 3 SRs relevant for LLE:
Four leptons (4L)
21
Phys. Rev. D. 90, 052001 (2014)
• Good agreement between expected and observed events in VRs and in SRs.
• Final result: sta;s;cal combina;on of all considered SRs.
• Main backgrounds: • DZ, ZZ Es;mated from MC • Non-‐prompt and fake leptons Es;mated with data driven methods, checked in VRs
g̃
g̃
�̃01
�̃01
p
p
q q
�
`
`
⌫
q q
�
`
`
⌫
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
• Aiming RPC models where Majorana par;cle pairs decay semileptonically .
• Selec;on: • 2 SS leptons OR 3 leptons • 3 relevant SRs:
• Final result: sta;s;cal combina;on of all considered SRs.
2 same sign leptons / 3 leptons (SS/3L)
• Main backgrounds: • Prompt leptons:
DW, DZ (dominant in SRb), WW, WZ, ZZ + jets (dominant in SRL) Es;mated from MC
• Fake leptons, charge-‐flip Es;mated with data-‐driven method [GeV]effm
200 400 600 800 1000 1200 1400
Eve
nts
/ 6
55 G
eV
1
2
3
4
5
6
7 ATLAS
= 8 TeVs, -1
L dt = 20.3 fb∫
SR3b Region
Data
SM Total
Fake leptons
Charge flip
Top + X
Diboson + Triboson
productiong~-g
~
bs (RPV)→1
t~
t, 1
t~ →g
~
) = (945, 417) GeV1
t~
, g~(
22
JHEP 06 (2014) 035
g̃ t t̃1
t χ̃01 gluino-mediated top squark → t χ̃0
1
b χ̃±1W±(∗) χ̃0
1 gluino-mediated top squark → b χ̃±1
c χ̃01 gluino-mediated top squark → c χ̃0
1
b s gluino-mediated top squark → b s (RPV)
g̃ q q̃(∗)
q̃ q′ χ̃±1
W±(∗)χ̃02
Z(∗)χ̃01 gluino-mediated (or direct) squark → q′ W Z χ̃0
1
W±(∗)χ̃01 gluino-mediated squark → q′W χ̃0
1
l̃±ν, l±ν̃
l̃l, ν̃νgluino-mediated (or direct) squark → sleptons
g̃ q q̃(∗)
q̃ q χ̃02
b̃1 t χ̃±1
W±(∗)χ̃01 direct bottom squark → t χ̃±
1
• Good agreement between expected and observed events in SRs.
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
[GeV]TmissE
250 300 350 400 450 500 550Ev
ents
/ 10
0 G
eV0
5
10
15
20
25ATLAS
-1=8 TeV, 20.3 fbsµhard 1L e/
6-jet SR
DataStandard ModelTop QuarksV+jetsFake LeptonsDibosons
)=01χ∼, ±
1χ∼, g~ 1-step, m(g~g~
(1025, 545, 65) GeV
One lepton (1L) • Aiming a wide variety of models (mSUGRA bRPV among them) with 1L or 2L OS. Here only 1L.
• Selec;on: • 1L + jets • 3 relevant SRs:
• Main backgrounds: • Dbar and W+jets MC normalized to data in CRs with lower met, mT cuts Extrapola;on to SRs tested in VRs
23
Phys. Rev. LeD. 114, 161801 (2015)
• Good agreement between expected and observed events in SRs.
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
0 leptons + 2-‐6 jets (0L + 2-‐6 jets)
• Selec;on: • no isolated leptons • 4 relevant SR with diff. jet mul;plicity :
>=5 jets with pT>60 GeV, at least one jet with pt>160 GeV
24
JHEP 09 (2014) 176
• Aiming a variety of RPC with no leptons in the final state
(incl.) [GeV]effm0 500 1000 1500 2000 2500 3000 3500 4000
Even
ts /
100
GeV
1
10
210
-1L dt = 20.3 fb∫ = 8 TeV)sData 2012 (
SM Total)=3050
1χ∼
)=385,m(±1χ∼
)=465,m(q~ m(q~q~
)=62501χ∼
)=945,m(±1χ∼
)=1265,m(g~ m(g~g~
Multi-jetsW+jets(+X) & single toptt
Z+jetsDiboson
ATLASSR - 6jt+
t+ t+
(incl.) [GeV]effm0 500 1000 1500 2000 2500 3000 3500 4000
Dat
a / M
C
00.5
11.5
22.5
• Main backgrounds • W+jets , combined Dbar + single top, Z(-‐>nunu) + jets and mul;jets . Normalize MC to data in 4 CRs per SR. Checked in several VRs
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
• Aiming RPC models and RPV with BNV
• Selec;on: • No isolated leptons • 13 relevant SRs with different jet and b-‐jet mul;plicity:
• Main backgrounds: • mul;jets Es;mated using matrix method • Dbar and W+jets Normalize MC to data in 1 CR per SR • Z+jets, DV, st Es;mated using MC
25
0 leptons + 7-‐10 jets (0L + 7-‐10 jets) J. High Energy Phys. 10 (2013) 130
g̃
g̃
�̃01
�̃01
p
p
q q
�00
q
q q
�00
q
1/2
Eve
nts
/ 4
Ge
V
-210
-110
1
10
210
310
410
510
610Data
Total background
Multi-jets
ql,ll→ ttSingle top
+W, Ztt + b-jetsν l→W
+ light jetsν l→W
, ll + jetsνν →Z
]:[900,150] [GeV]1
0χ∼,g~[
ATLAS
=8 TeVs, -1L dt = 20.3 fb∫ 50 GeV≥
T 10 jets, p≥
340 GeV≥ ΣJM
]1/2 [GeVTH/missTE
0 2 4 6 8 10 12 14 16D
ata
/Pre
dic
tion
00.5
11.5
2
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
) 1bl + m0
bl)/(m1
bl - m0bl
(m0 0.2 0.4 0.6 0.8 1
Entri
es/0
.05
-110
1
10
210
310
Total backgroundtt
*γZ/Single topOtherB-L stop (500 GeV)B-L stop (800 GeV)B-L stop (1000 GeV)
ATLAS Simulation Preliminary
-1 = 8 TeV, 20.3 fbs
b
b̄
`+
`�
p
p
t̃
t̃⇤
�0
�0
26
B-‐L analysis descrip;on ATLAS-‐CONF-‐2015-‐015
[GeV] 0bl m
0 200 400 600 800 1000 1200
Entri
es/5
0 G
eV
-210
-110
1
10
210
310Total backgroundtt
*γZ/Single topOtherB-L stop (500 GeV)B-L stop (800 GeV)B-L stop (1000 GeV)
ATLAS Simulation Preliminary
-1 = 8 TeV, 20.3 fbs
• Search for a peak in the invariant mass distribu;on of (two pairs of) bl
• Impose a U(1)B-‐L symmetry to the SM with right-‐handed neutrinos • Symmetry is spontaneously broken by right-‐handed sneutrino vev • Simplified model with stop (LSP) pair produc;on
• Selec;on: • 2 OS leptons (e, μ) + 2 bjets (no ETmiss cut!) + Z veto • Check mbl asymmetry for all possible combina;ons of bl • Take the combina;on with smallest mbl asymmetry • Two SRs defined for high sensi;vity to different stop masses
• Signal: small mbl • SM bkg: flat mbl
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
b
b̄
`+
`�
p
p
t̃
t̃⇤
�0
�0
• Main backgrounds: • Dbar and Z+jets Normalize MC to data in CRs • others Es;mated using MC
• Good agreement between data and SM expecta;ons in all VRs and SRs
27
B-‐L analysis results ATLAS-‐CONF-‐2015-‐015
VR Top 1VR Top 1 (ee)
VR Top 1 (mm)
VR Top 1 (em)
VR Top 2VR Top 2 (ee)
VR Top 2 (mm)
VR Top 2 (em)
VR Top 3VR Top 3 (ee)
VR Top 3 (mm)
VR Top 3 (em)
VR Z VR Z (ee)VR Z (mm)
Num
ber o
f eve
nts
1
10
210
310
410
510
ATLAS Preliminary -1 = 8 TeV, 20.3 fbsDatatt
*γZ/Single topOther
VR Top 1VR Top 1 (ee)
VR Top 1 (mm)
VR Top 1 (em)
VR Top 2VR Top 2 (ee)
VR Top 2 (mm)
VR Top 2 (em)
VR Top 3VR Top 3 (ee)
VR Top 3 (mm)
VR Top 3 (em)
VR Z VR Z (ee)VR Z (mm)
tot
σ) /
pr
ed -
nob
s(n -2
0
2
• Limits set on the stop mass range (1.1, 0.5) TeV
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
Obs
erve
d M
ass
Exclu
sion
[GeV
]
1050
1100
1150
1200
1250
1300
1350
)RτBR(0 0.2 0.4 0.6 0.8 1
) LτBR
(
0
0.1
0.2
0.3
0.4
0.5
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs ν-l+ l→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.1g~) / m(01χ∼All limits at 95% CL m(
GluinoELL
Further results on LLE
28
R=0.1
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015 O
bser
ved
Mas
s Ex
clusio
n [G
eV]
1200
1250
1300
1350
1400
)RτBR(0 0.2 0.4 0.6 0.8 1
) LτBR
(
0
0.1
0.2
0.3
0.4
0.5
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs ν-l+ l→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.5g~) / m(01χ∼All limits at 95% CL m(
GluinoELL
Obs
erve
d M
ass
Exclu
sion
[GeV
]
1150
1200
1250
1300
1350
)RτBR(0 0.2 0.4 0.6 0.8 1
) LτBR
(
0
0.1
0.2
0.3
0.4
0.5
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs ν-l+ l→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.9g~) / m(01χ∼All limits at 95% CL m(
GluinoELL
R=0.5 R=0.9
)RτBR(0 0.2 0.4 0.6 0.8 1
) LτBR
(
0
0.1
0.2
0.3
0.4
0.5
SS3Lboth
4L
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs ν-l+ l→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.9g~) / m(01χ∼m(
GluinoELL
limits driven by the SS/3L analysis
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
1L
both0L 2-6 jets
6jt+
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.9g~) / m(01χ∼m(
GluinoDLQ
29
Further results on LQD gluino ATLAS-‐CONF-‐2015-‐018
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
Obs
erve
d M
ass
Exclu
sion
[GeV
]920
940
960
980
1000
1020
1040
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.1g~) / m(01χ∼All limits at 95% CL m(
GluinoDLQ
Obs
erve
d M
ass
Exclu
sion
[GeV
]
102010401060108011001120114011601180120012201240
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.5g~) / m(01χ∼All limits at 95% CL m(
GluinoDLQ
Obs
erve
d M
ass
Exclu
sion
[GeV
]
1080
1100
1120
1140
1160
1180
1200
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.9g~) / m(01χ∼All limits at 95% CL m(
GluinoDLQ
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
0L 7-10 jetsj50
j50 + j80
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.5g~) / m(01χ∼m(
GluinoDLQ
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
0L 7-10 jetsj80
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼qq0
1χ∼ qq→ g~g~ →pp
) = 0.1g~) / m(01χ∼m(
GluinoDLQ
R=0.1 R=0.5 R=0.9
Obs
erve
d M
ass
Exclu
sion
[GeV
]
9209409609801000102010401060108011001120
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼q0
1χ∼ q→ q~q~ →pp
) = 0.5q~) / m(01χ∼All limits at 95% CL m(
SquarkDLQ
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
1L both
0L 2-6 jets6jt+
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼q0
1χ∼ q→ q~q~ →pp
) = 0.5q~) / m(01χ∼m(
SquarkDLQ
Obs
erve
d M
ass
Exclu
sion
[GeV
]
10801100112011401160118012001220124012601280
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼q0
1χ∼ q→ q~q~ →pp
) = 0.9q~) / m(01χ∼All limits at 95% CL m(
SquarkDLQ
)τBR(0 0.1 0.2 0.3 0.4 0.5
BR(b
)
0
0.2
0.4
0.6
0.8
1
1L both0L 2-6 jets
6jt+
ATLAS Preliminary
-1 = 8 TeV, 20.3 fbs qq ν l/→ 01χ∼ 0
1χ∼q0
1χ∼ q→ q~q~ →pp
) = 0.9q~) / m(01χ∼m(
SquarkDLQ
30
Further results on LQD squark ATLAS-‐CONF-‐2015-‐018
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
R=0.5 R=0.9
• and masses increase with μ. • μ>570 GeV ! LPS = t1̃ ! Different phenomenology, not considered here
Exploring bRPV in pMSSM
31
[GeV]L,3
q~m200 400 600 800 1000 1200 1400 1600
m [G
eV]
400
600
800
1000
1200
1400
1600
ATLAS Preliminary
)1b~mass()1t
~mass()2t
~mass(
)+ 1χ∼ b
→ 1t~
BR(
00.10.20.30.40.50.60.70.80.91
[GeV]µ
200 250 300 350 400 450 500 550 600
[GeV
]L,
3q~
m
400
500
600
700
800
900
1000
1100
1200 )+ 1χ∼ b
→ 1t~
BR(
00.10.20.30.40.50.60.70.80.91
ATLAS Preliminary
Natural bRPV pMSSM
t1 < 600 GeV bounded by μ
€
˜ χ 1,20
€
˜ χ 1±
~
t1 b l ~
t1 t χ01,2
~ ~
t1 b χ± 1,2
~ ~
t1 = LSP ~
• Complex phenomenology, discussed for the first ;me in RPV summary paper: ATLAS-‐CONF-‐2015-‐018 • m( , ) vary with mq̃L,3, almost independent of μ.
€
˜ t
€
˜ b
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
χ0, χ± masses increase
• other regions: more compressed spectrum reduces the momentum of par;cles from the t1̃ and b"1 decays and increases signal contamina;ng the valida;on regions of the SS/3L analysis
• Interes;ng region around μ = 550 GeV and mqL,3 = 800 GeV: • m(t1̃) ≈ m(χ±̃1) ≈ m(χ̃01). •
Exploring bRPV in pMSSM
32
)+ 1χ∼ b
→ 1t~
BR(
00.10.20.30.40.50.60.70.80.91
[GeV]µ
200 250 300 350 400 450 500 550 600
[GeV
]L,
3q~
m
400
500
600
700
800
900
1000
1100
1200 )+ 1χ∼ b
→ 1t~
BR(
00.10.20.30.40.50.60.70.80.91
ATLAS Preliminary
Natural bRPV pMSSM takes largest mass available for natural pMSSM scenario (m(t ) ︎ < 580 GeV). < 580 GeV). Maximum possible Δm( , LSP)
€
˜ t 1
€
˜ t 1
• neutralino LSP • t1̃ b χ±̃1,2 kinema;cally accessible to avoid discon;nui;es in the spar;cle decay paDerns
t1̃ b χ±̃1,2
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015
100% ~
Exploring bRPV in pMSSM
33
• Search channels requiring at least one lepton are used to constrain the natural bRPV model. • The lepton requirement is mo;vated by the high branching ra;os of the χ01 and χ±1 to leptons, together with the possibility of addi;onal leptons from RPC SUSY cascades.
• L1 search: too ;ght met cut ! low sensi;vity BUT • Since neutralino LSP is majorana! two LSP can decay to SS leptons st1 = LSP
t̃
t̃
�̃±1�̃0
1
p
p✏
b ⌫
W
✏
t
⌫
b
b
�̃±1
�̃01p
p
✏
`
b
b✏
`
W
)b b
± τ
, b b
± l
→ ± 1χ∼BR
(
00.10.20.30.40.50.60.70.80.91
[GeV]µ
200 250 300 350 400 450 500 550 600 [G
eV]
L,3
q~m
400
500
600
700
800
900
1000
1100
1200 )b b
± τ
, b b
± l
→ ± 1χ∼BR
(
00.10.20.30.40.50.60.70.80.91
ATLAS Preliminary
Natural bRPV pMSSM
• Spar;cle decays determined by bRPV params ε. • RPV can happen before LPS decay
)±
W± l→ 0 1χ∼
BR(
00.10.20.30.40.50.60.70.80.91
[GeV]µ
200 250 300 350 400 450 500 550 600
[GeV
]L,
3q~
m
400
500
600
700
800
900
1000
1100
1200 )±
W± l→ 0 1χ∼
BR(
00.10.20.30.40.50.60.70.80.91
ATLAS Preliminary
Natural bRPV pMSSM
Emma Torró SUSY15 Lake Tahoe, 28 Aug. 2015