DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron Search for SUSY at the Tevatron Andrey Loginov Yale University DIS 2009, Madrid, Spain, 26-30 April 2009 For CDF and DØ Collaborations -1-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Search for SUSY at the Tevatron
Andrey Loginov
Yale University
DIS 2009, Madrid, Spain, 26-30 April 2009
For CDF and DØ Collaborations
-1-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Why
Standard Model (SM)
• The SM describes data from colliderexperiments very well
• The only particle missing is Higgs boson
– Directly sensitive to ΛUV(unlike other SM particles)
– Enormous quantum corrections:
∆m2H = −|λf |2
8π2 Λ2UV + . . .
• The predicted high energy behavioris unphysical at the TeV scale
• Didn’t predict massive neutrinos
• Cosmology data needs more:Dark Matter Candidate
-2-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Why
Cosmology
• Galaxy Rotation
• Requires massive stable particles
• The theory should
– Describe early Universe physics
– Predict relic density (WMAP data)
-3-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
SUSY
• Higgs boson mass quantum corrections
Hf
(a)
S
H(b)
∆m2H = 1
8π2(λS − |λf |2)Λ2UV + . . .
•Q|Boson〉 = |Fermion〉,Q|Fermion〉 = |Boson〉
• R-Parity: PR = (−1)3(B−L)+2s
1 for SM, -1 for superpartners
• R-parity is conserved:
– The SUSY particles produced in pairs
– Dark Matter candidate
• Supersymmetry is broken
• 32 new particles, 105 new parameters2 4 6 8 10 12 14 16 18
Log10(Q/1 GeV)
0
10
20
30
40
50
60
α−1
α1−1
α2−1
α3−1
-4-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
SUSYNames Spin PR Gauge Eigenstates Mass Eigenstates
Higgs bosons 0 +1 H0u H0
d H+u H−
d h0 H0 A0 H±
uL uR dL dR (same)
squarks 0 −1 sL sR cL cR (same)
tL tR bL bR t1 t2 b1 b2
eL eR νe (same)
sleptons 0 −1 µL µR νµ (same)
τL τR ντ τ1 τ2 ντ
neutralinos 1/2 −1 B0 W 0 H0u H0
d χ01 χ0
2 χ03 χ0
4
charginos 1/2 −1 W± H+u H−
d χ±1 χ±
2
gluino 1/2 −1 g (same)goldstino
(gravitino)1/2
(3/2)−1 G (same)
-5-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Where: Tevatron
• pp Collisions• √s=1.96 TeV• Lpeak = 3.7×1032 cm−2s−1
Store Number T
otal
Lum
inos
ity (p
b-1)
0
1000
2000
3000
4000
5000
6000
1000 2000 3000 4000 5000 6000
1 4 7 10 1 4 7101 4 7 1 4 7101 7101 4 7101 4 72002 2003 2004 20052006 2007 2008 2009Year
Month
DeliveredTo tape
•>6 fb−1 delivered, >5 fb−1 on tape
• In this talk: up to 4.1 fb−1 results
-6-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Where: CDF and DØ
Calorimeter
Shielding
Toroid
Muon Chambers
Muon Scintillators
η = 0 η = 1
η = 2
[m]
η = 3
–10 –5 0 5 10
–5
0
5
Detectors and identified objects:• Trackers: e, µ, jets• Calorimeters: e, µ, jets, 6ET• Muon Detectors: µ, soft µ′s from jets
-7-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics
Data-driven backgrounds are crucial
• Jets misID as leptons
– Isolation etc.
• Fake 6ET (mismeasured jet, lost µ)
Tracking Iso:∑
ptrackT in η − φ
Calorimeter Iso:∑
EtowerT in η − φ
Jet with a displaced vertex:“b-tag”, “HF-jet”
-8-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics
• StopTop sample is large and pure, top dileptons are under control
• Sbottom4 b-quarks in the final state
• RPV ντ
Single sparticle production is allowed
• Direct production of the GauginosLighter, EWK production cross sections, leptonic final states
• Squarks and Gluinos:Heavy, but strong production cross-section
• CHAMPs (Charged MAssive Stable Particles)“slow moving muons”
-9-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: Stop
• t → bχ±1 → bχ0
1`ν (mt1< mt)
• on-shell charginos• tt sample: ` 6ET + 2 b − jets
Mass (GeV)t~100 150 200 250 300 350
Even
ts/2
0 G
eV
0
5
10
15
20
25
Mass (GeV)t~100 150 200 250 300 350
Even
ts/2
0 G
eV
0
5
10
15
20
25data
Stop (DIL BR = 0.30)
=172.5 GeV)t
Top (M
Z + Heavy Flavor
Z + Light Flavor
Dibosons
Fakes
=135 GeVt~M=125.8 GeV±χ∼M=58.8 GeV0χ∼M
)-1CDF Run II Preliminary (2.7 fb
Reconstructed Stop Mass, B-Tagged Channel
2) GeV/c1t~M(
135 140 145 150 155 160 165 170 175 180 185
2) G
eV/c
0 1χ∼M
(
45
50
55
60
65
70
75
80
85 2)=125.8 GeV/c±1
χ∼M(b)=1
1±χ∼→1t
~BR(
Observed 95% CL)-1CDF Run II Preliminary (2.7 fb
l)=0.25ν10χ∼→
1±χ∼(2BR
l)=0.50ν10χ∼→
1±χ∼(2BR
l)=1.0ν10χ∼→
1±χ∼(2BR
Excluded by LEP
-10-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: Stop
• t → `bν (mχ±
1> mt)
•DØ ee, eµ• CDF ee, eµ, µµ
DØ: arXiv 0811.0459 (accepted to PLB)
(GeV)TS50 100 150 200 250 300 350
Even
ts /
74 G
eV
-110
1
10
210
50 100 150 200 250 300 350-110
1
10
210
Inst. Bkg.Diboson
ee→ *γZ/ττ → *γZ/
ttDataSignal ASignal B
(f)-1DØ, L = 1 fb
DataSt
(GeV)TS100 150 200 250 300 350 400
Even
ts /
20 G
eV
1
10
210
100 150 200 250 300 350 400
1
10
210Inst. Bkg.Diboson
τ τ->*γZ/tt
DataSignal ASignal B
(f)-1DØ, L = 1 fb
DataSt_new
A/B: m(t, ν) = (140, 110)/(170, 90) GeV
, GeVTE20 40 60 80 100 120 140 160 180 200
# of
eve
nts/
12 G
eV
-210
-110
1
10
210 )µµ+µ, Cut Group c (ee+eTE
-1CDF Run II Preliminary, 1 fb
2)=75 GeV/cν∼)=150, m(t~m(
stop signall+fakesHF(data)Drell-Yandibosontt
data
, GeVTE20 40 60 80 100 120 140 160 180 200
# of
eve
nts/
12 G
eV
-210
-110
1
10
210
]2 [GeV/c t~ M60 80 100 120 140 160 180 200
]2
[GeV
/c ν∼
M
40
50
60
70
80
90
100
110
120
130 bν∼ l → t~Scalar top in the Dilepton Channel:
b
+ M
ν∼
< M
t~ M
AlephL3
OpalLEP
CDF Preliminaryb)=100%ν∼ l→t~ Br (τ,µe,
∑-1Run II, 1 fb
CDF ExpectedCDF Observed
-1DØ Run II 1 fb
]2 [GeV/c t~ M60 80 100 120 140 160 180 200
]2
[GeV
/c ν∼
M
40
50
60
70
80
90
100
110
120
130
Brand new result from CDF!-11-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: Sbottom (from gluino decay)
• g → bb, b → bχ01
• 6ET + 4 b − jets, 2.5 fb−1 (CDF)• 2 NN (small and large ∆m
gb)
• 1 and 2 b-tags samples
NN Output-1.5 -1 -0.5 0 0.5 1 1.5
N-Ev
ents
0
2
4
6
8
10)=315b~)=335, M(g~Signal M(
CDF DataEWK BOSONSTOPMistagsInclusive Multijets
NN Output-1.5 -1 -0.5 0 0.5 1 1.5
N-Ev
ents
0
2
4
6
8
10
CDF Run II Preliminary -1 L dt=2.5 fb∫
Two inclusive b-tags
NN Output-1.5 -1 -0.5 0 0.5 1 1.5
N-Ev
ents
0
2
4
6
8
10)=315b~)=335, M(g~Signal M(
CDF DataEWK BOSONSTOPMistagsInclusive Multijets
NN Output-1.5 -1 -0.5 0 0.5 1 1.5
N-Ev
ents
0
2
4
6
8
10
CDF Run II Preliminary -1 L dt=2.5 fb∫
Two inclusive b-tags
)2Gluino Mass (GeV/c200 250 300 350 400
)2
Sbot
tom
Mas
s (G
eV/c
100
150
200
250
300
350
)2Gluino Mass (GeV/c200 250 300 350 400
)2
Sbot
tom
Mas
s (G
eV/c
100
150
200
250
300
350
CDF Run I excluded
kinem
atica
lly for
bidde
n
1b~
b→ g~
2) = 60 GeV/cχ∼M(2) = 500 GeV/cq~M(
-1Run II 156 pbExcluded Limit
-1DØ Run II 310 pbSbottom Pair ProductionExcluded Limit
)2Gluino Mass (GeV/c200 250 300 350 400
)2
Sbot
tom
Mas
s (G
eV/c
100
150
200
250
300
350CDF Run II Preliminary
-1 L dt=2.5 fb∫Observed 95% CL limitExpected 95% CL limit b (100% BR)b~ → g~
(100% BR)10χ∼ b→ b~
DØ PRL 97 171806 (2006), 310 pb−1
-12-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: RPV ντ
• CDF @ 1 fb−1: eµ, µτ ,eτ•DØ @ 4.1 fb−1: eµ
(GeV)µeM0 50 100 150 200 250 300
Even
ts/1
0 G
eV
-110
1
10
0 50 100 150 200 250 300-110
1
10
DATA
*γZ/
diboson
ttbar
γw+jet/
= 100 GeV)τν∼
signal (M
preliminary-1DØ, 3.1 fb
W∆L=1 = 12λ
ijkLiLjek + λ′ijkLiQjdk + µ′iLiHu
)2 (GeV/cµInvariant Mass of e100 200 300 400 500 600 700
)2Ev
ents
/(10
GeV
/c
-210
-110
1
10
210
310
)2 (GeV/cµInvariant Mass of e100 200 300 400 500 600 700
)2Ev
ents
/(10
GeV
/c
-210
-110
1
10
210
310)-1CDF Run II Preliminary (1 fb
) signal2(500 GeV/cτν∼=0.05132λ=0.10, 311’λ
DataPhysics Backgrounds
t , WW, t ττ → *γZ/Fake Backgrounds
+ jetsγ, W(+jets), dijets, µµ → *γZ/
Channelµe
)2 (GeV/cτµVisible Mass of 100 200 300 400 500 600 700
)2Ev
ents
/(10
GeV
/c
-210
-110
1
10
210
)2 (GeV/cτµVisible Mass of 100 200 300 400 500 600 700
)2Ev
ents
/(10
GeV
/c
-210
-110
1
10
210)-1CDF Run II Preliminary (1 fb
) signal2(500 GeV/cτν∼=0.05233λ=0.10, 311’λ
DataPhysics Backgrounds
t , WW, t ττ → *γZ/Fake Backgrounds
, dijetsµµ → *γW(+jets), Z/
Channelτµ
)2 (GeV/cτVisible Mass of e100 200 300 400 500 600 700
)2Ev
ents
/(10
GeV
/c
-210
-110
1
10
210
)2 (GeV/cτVisible Mass of e100 200 300 400 500 600 700
)2Ev
ents
/(10
GeV
/c
-210
-110
1
10
210
)-1CDF Run II Preliminary (1 fb) signal2(500 GeV/cτν∼=0.05133λ=0.10, 311’λ
DataPhysics Backgrounds
t , WW, t ττ → *γZ/Fake Backgrounds
ee→ *γ + jets, W(+jets), Z/γDijets,
Channelτe
Meµ Mµτ Meτ
-13-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: RPV ντ
(GeV)τν∼M
100 150 200 250 300
311
’ λ95
% C
L
0
0.001
0.002
0.003
0.004
0.005
0.006=0.005312λ=0.01312λ=0.02312λ=0.07312λ
preliminary-1DØ, 4.1 fb
DØ:
• All RPV couplings are null butλ′311 and λ321 = λ312
• λ′311 ≤ 0.12, λ321 ≤ 0.07for Mντ < 100GeV
(GeV)τν∼M
100 150 200 250 300
)(fb)
µ B
R(e
× σ95
% C
L
0
5
10
1520
25
30
35
40
45
50
Observed LimitExpected Limit
σ1 ±Expected Limit σ2 ±Expected Limit
preliminary-1DØ, 4.1 fb
)2 Mass (GeV/cτν∼100 200 300 400 500 600 700 800
) (pb
)τµ
Br (
× σ95
% C
L
-210
-110
1
)2 Mass (GeV/cτν∼100 200 300 400 500 600 700 800
) (pb
)τµ
Br (
× σ95
% C
L
-210
-110
1
τµ → τν∼ → pN.L.O. p
=0.05233λ=0.10,311’λ
Observed
Expected
σ1
-1CDF Run II Preliminary, 1 fb
-14-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: Chargino/Neutralino
DØ: arXiv 0901.0646
• ee, µµ, eµ, τµ + trk(e,µ,τ ) + 6ET
(GeV)eem0 50 100 150 200 250
Even
ts /
10 G
eV
-210
-110
1
10
210
(GeV)eem0 50 100 150 200 250
Even
ts /
10 G
eV
-210
-110
1
10
210Data
*, YγZ/Multijet
γW+jet/WW,ZZWZ
Data *, YγZ/
Multijet
γW+jet/WW,ZZWZ
tt
SUSY 1SUSY 2
-1DØ, 2.3 fbeel selection
CDF: PRL 101, 251801 (2008)
• 3 leptons (e, µ) + 6ET• 2 leptons (e, µ) + trk(e,µ,τ ) + 6ET
CDF 2fb−1, dilepton+trk:
7 vs 6.4±1.1 (all channels)fake ` 1.4, DY 3.0, dibosons 1.6, tt 0.5
-15-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: Chargino/Neutralino
mSUGRA: 5 parametersm0, m1/2, tanβ, A0, sign(µ)
A0 = 0, tanβ = 3, µ > 0
Chargino Mass (GeV)100 110 120 130 140 150 160
BR(
3l) (
pb)
×) 20 χ∼ 1± χ∼ (σ
0
0.1
0.2
0.3
)20χ∼)>M(l~); M(
10χ∼2M(≈)
20χ∼M(≈)
1±χ∼M(
>0, no slepton mixingµ=3, βtan
-1DØ, 2.3 fb
LEP
3l-max
0large-m
Observed LimitExpected Limit
Chargino Mass (GeV)100 110 120 130 140 150 160
BR(
3l) (
pb)
×) 20 χ∼ 1± χ∼ (σ
0
0.1
0.2
0.3
3`-max:m( ˜, ν) > m(χ±1 , χ0
2),
no ˜ mixing
(GeV)0m0 50 100 150 200 250
(GeV
)1/
2m
150
200
250
300
(GeV)0m0 50 100 150 200 250
(GeV
)1/
2m
150
200
250
300 DØ observed limitDØ expected limitCDF observed
)-1limit (2.0 fb
LEP Chargino Limit
LEPSleptonLimit
-1DØ, 2.3 fbmSUGRA
> 0µ = 0, 0
= 3, Aβtan20χ∼
1±χ∼Search for
)2
0χ∼
M(
≈) l~M(
)1±χ∼
M(
≈) ν∼M
(
(GeV)0m0 50 100 150 200 250
(GeV
)1/
2m
150
200
250
300
βtan 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
BR(
3l) (
pb)
×) 20 χ∼ 1± χ∼ (σ
0
0.1
0.2
0.3
mSUGRA
) = 1 GeV20χ∼) - M(1τ∼)= 130 GeV; M(
1±χ∼M(
-1DØ, 2.3 fb
LEPObserved LimitExpected Limit
βtan 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
BR(
3l) (
pb)
×) 20 χ∼ 1± χ∼ (σ
0
0.1
0.2
0.3
-16-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: Squark/Gluino
• squark q → qχ01, gluino g → qqχ0
1• 2 jets + 6ET: mq < mg ⇒ qq• 3 jets + 6ET: mq ∼ mg ⇒ qg• 4 jets + 6ET: mq > mg ⇒ gg• Reject leptons. Main backgrounds:
QCD, Z → νν+j, W → `ν+j, tt
CDF: PRL 102, 121801 (2009)
(3jets)[GeV] TH200 300 400 500 600 700 800 900
even
ts /
30 G
eV
-110
1
10
210
3 MET>120 HT>330≥ jetN CDF Run II Preliminary
)-1Data (L = 2.0 fbQCD + non QCD Bkg.non QCD Bkg.Total Syst. Uncertainty
2 = 249 GeV/cg~
Bkg.+Sig. M2 = 270 GeV/cs~ M
(3jets)[GeV] TH200 300 400 500 600 700 800 900
even
ts /
30 G
eV
-110
1
10
210
DØ: Phys. Lett. B 660 , 449 (2008)2j: low-m0, 3j: mq ≈ mg, 4j: high-m0
(GeV)TE0 50 100 150 200 250 300 350 400 450 500
Even
ts /
20 G
eV
-110
1
10
210
310
(GeV)TE0 50 100 150 200 250 300 350 400 450 500
Even
ts /
20 G
eV
-110
1
10
210
310 -1DØ, L=2.1 fb
DataSM BackgroundFitted QCDSUSY
(b)
-17-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: Squark/Gluino
CDF: PRL 102, 121801 (2009)
)2 (GeV/cg~M0 100 200 300 400 500 600
)2 (G
eV/c
q~M
0
100
200
300
400
500
600CDF Run II Preliminary -1L=2.0 fb
no mSUGRAsolution
LEP 1 + 2
UA1
UA2
FNAL Run I
g~
= Mq~M
)2 (GeV/cg~M0 100 200 300 400 500 600
)2 (G
eV/c
q~M
0
100
200
300
400
500
600observed limit 95% C.L.expected limit
<0µ=5, β=0, tan0A
Theoretical uncertainties includedin the calculation of the limit
mg ≈ mq: mg > 392 GeVany mq: mg > 280 GeVmq < 378 GeV : mg > 423 GeV
mq > 379 GeVmg > 308 GeV
Gluino Mass (GeV)0 100 200 300 400 500 600
Squa
rk M
ass
(GeV
)0
100
200
300
400
500
600
-1DØ, L=2.1 fb<0µ=0,
0=3, Aβtan
UA1
UA2
LEP
CDF
IB
DØ IA
DØ IB
DØ II
no mSUGRAsolution
±χ∼LEP2 ±l~LEP2
DØ: Phys. Lett. B 660 , 449 (2008)
-18-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: Squark/Gluino
-19-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: CHAMPs
• Charged MAssive Stable Particles• Appear as “slow moving muons”• stop, stau, chargino, ...
CDF: arXiv 0902.1266, sub.to PRL
• Time of Flight (TOF) detector• Tracking•W → eν, Z → ee for TOF studies
DØ: arXiv 0809.0472, sub.to PRL
• Timing in µ system ⇒ the speed•M(µµ)• 1)Zµµ, 2)(1 − v)/σv < 0
Invariant Mass (GeV)0 200 400 600 800 1000
Even
ts
1
10
210
310
410∅(a) D Background
Stau (300 GeV)
Speed Significance Product0 50 100 150 200
Even
ts
10
210
310
410
510 ∅(b) D BackgroundStau (300 GeV)
-20-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Physics: CHAMPs
• Charged MAssive Stable Particles• Appear as “slow moving muons”• stop, stau, chargino, ...
CDF: arXiv 0902.1266, sub.to PRL
)2Stop Mass (GeV/c100 120 140 160 180 200 220 240 260
Cros
s se
ctio
n (p
b)
-210
-110
1
10 Stop Production cross section (NLO)µCross section limit from central
-1 = 1.03 fbL dt ∫
CDF Run II Preliminary
Same result implies:
• σch < 10fb at 95% CL for pchT >
40GeV , |ηch| < 1, 0.4 < βch < 0.9
DØ: arXiv 0809.0472, sub.to PRL
Mass [GeV]50 100 150 200 250 300
Cros
s se
ctio
n [p
b]
-310
-210
-110
1
10
Mass [GeV]50 100 150 200 250 300
Cros
s se
ctio
n [p
b]
-310
-210
-110
1
10Observed Cross Section LimitExpected Cross Section LimitNLO Cross Section PredictionNLO Cross Section Uncertainty
-1 1.1 fb∅D(b)
Limits for chargino mass for pair pro-duced gaugino-like charginos
-21-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Summary
• Supersymmetry is not discovered... yet
• Tevatron, CDF, DØ are running very well
• Data sample is getting bigger
– Expect 2-3 times more data to analyze
– Can look at the rarer signatures
– Keep digging and pushing limits
• CDF Exotics:http://www-cdf.fnal.gov/physics/exotic/exotic.html
• DØ Exotics:http://www-d0.fnal.gov/Run2Physics/WWW/results/np.htm
-22-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Summary
• Keep your eyes open for the unexpected :)
-23-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
Summary
• Stay tuned!
SUSY particle Scenario Mass Limit (GeV)
Squark and Gluino mSUGRA, low tanβ ≈ 400
Sbottom Br(g → bb) ≈ 100% ≈ 300
Stau RPV, λ′311 6=0, λ321 = λ312 6=0 ≈ 200
Chargino mSUGRA, 3` − max scenario ≈ 140
Stop Long life-time (CHAMP) ≈ 250
-24-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
-BACKUP-SLIDES-
mSUGRA
-25-
DIS 2009, Madrid, Spain, 26-30 April 2009 Andrey Loginov Search for SUSY at the Tevatron
mSUGRA
In mSUGRA, symmetry breaking is via gravitational interactions and theSUSY parameter space is reduced to only 5 parameters:
•m0: the universal scalar mass at the grand unification scale ΛGUT•m1/2: the universal gaugino mass at ΛGUT•A0: the universal trilinear coupling at ΛGUT• tanβ: the ratio of the vacuum expectation values of the two Higgs fields• µ: the sign of the Higgs-mixing mass parameter
2 4 6 8 10 12 14 16 18Log10(Q/1 GeV)
0
100
200
300
400
500
600
Mas
s [G
eV]
m0
m1/2
(µ2+m02)1/2
squarks
sleptons
M1
M2
M3
Hd
Hu
-26-