experimental searches for susy at the tevatron
DESCRIPTION
Experimental Searches for SUSY at the Tevatron. Monica D’Onofrio IFAE-Barcelona On behalf of the CDF and DØ collaborations SUSY’09 , Boston, USA, June 5-10, 2009. _. The Tevatron. Fermilab. p. p. Highest-energy accelerator currently operational performing very well!. CDF. DØ. - PowerPoint PPT PresentationTRANSCRIPT
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Experimental Searches Experimental Searches for SUSY at the Tevatronfor SUSY at the Tevatron
Monica D’OnofrioIFAE-Barcelona
On behalf of the CDF and DØ collaborationsOn behalf of the CDF and DØ collaborations
SUSY’09SUSY’09 , , Boston, USA, June 5-10, 2009Boston, USA, June 5-10, 2009
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The TevatronThe Tevatron
Monica D'Onofrio, IFAEExperimental Searches for SUSY at the
Tevatron, 6/5/09 2
Proton-antiproton: √s = 1.96 TeV
Typical (peak) initial inst. Luminosity ~ 3.3 (3.5)*1032 cm-2 s-1
Integrated Luminosity/week(month) ~ 75 pb-1/(260 pb-1)
Highest-energy accelerator currently operational performing very well!
p p_
CDF
DØ
Delivered: 6.8 fbDelivered: 6.8 fb-1-1
Fermilab
Integrated luminosity per year
Peak luminosity
year: ‘02 ‘03 ‘04 ‘05 ‘06 ‘07 ‘08 ‘09
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CDF and CDF and DØDØ in RunIIin RunII
Monica D'Onofrio, IFAEExperimental Searches for SUSY at the
Tevatron, 6/5/09 3
DØCDF
Took > 1 year of collisions to get to stable high efficiency
(80-90%)
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Supersymmetry in 30’’Supersymmetry in 30’’
Monica D'Onofrio, IFAEExperimental Searches for SUSY at the
Tevatron, 6/5/09 4
SUSY: New spin-based symmetry relating fermions and bosons:
Naturally solves the hierarchy problem
Q|Boson> = Fermion
Q|Fermion> = Boson
Define R-parity = (-1)3(B-L)+2s
R = 1 for SM particles R = -1 for MSSM partners
gaugino/higgsino mixing
If conserved, provides Dark Matter Candidate
(Lightest Supersymmetric Particle)
No SUSY particles found yet SUSY must be broken > 100 parameters even in “minimal”
models
The Standard Model is theoretically incomplete Require fine tuning, account only for 4% of energy in Universe ….
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Searching for SUSYSearching for SUSY
Monica D'Onofrio, IFAEExperimental Searches for SUSY at the
Tevatron, 6/5/09 5
Signature-based searches: Search for unusual final states with specialized analysis Optimize selection to reduce backgrounds Interpret the results in several models (GMSB, AMSB, RPV-
SUSY etc.)
Model-inspired searches: Explore large regions of parameter space Theory driven: constrained MSSM models used as benchmark mSUGRA, GMSB, etc.
Global searches: Maximize parameter space coverage Less sensitivity but could give hint of deviation from SM
predictions
The breaking mechanism determines the phenomenology and the search strategies
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OutlineOutline “Standard SUSY” searches
mSUGRA-inspired: chargino/neutralino Squarks and gluinos
GMSB-inspired: Chargino/neutralino
“Non-Standard SUSY” searches Bs RPV SUSY (sneutrinos) Long-Lived Particles SUSY Hidden Valleys
Not only SUSY ..
Summary and Conclusions
Monica D'Onofrio, IFAEExperimental Searches for SUSY at the
Tevatron, 6/5/09 6
CDF: http://www-cdf.fnal.gov/physics/exotic/exotic.html
DØ: http://www-d0.fnal.gov/Run2Physics/np/
SUPE
R
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Standard SUSY searches: Standard SUSY searches: mSUGRAmSUGRA
Monica D'Onofrio, IFAEExperimental Searches for SUSY at the
Tevatron, 6/5/09 7
(p
b)
m (GeV)
0,6tan,300
300,100
0
2/10
A
GeVmGeVm
mixing of 3rd generation
leads to light stop,sbottom and stau mass
Squarks andgluinos heavy 1st and 2nd
generation squarks are mass degenerate
Light gauginosalso expected
mSUGRA provides a good reference model (5 parameters) Consider production with highest cross sections
Small masses (chargino/neutralinos) or large couplings (squark/gluino)
Final states depend on sparticle mass hierarchy and mixing (low/high tan)
0,4tan,300
150,100
0
2/10
A
GeVmGeVm
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0022 ±±
1 1 production: “trileptons” production: “trileptons”
Monica D'OnofrioExperimental Searches for SUSY at the
Tevatron, 6/5/09 8
Assume RP conservation, 01 is LSP
Low cross sections (σ x Br < 0.5 pb) Very clean signature:
Missing ET due to undetected 01
3 isolated leptons
Main backgrounds: WW, WZ Drell-Yan, W+jets, ttbar
Rejection using kinematic selections on: Ml+l-, N jets, Missing ET, between leptons...
• 3 identified leptons (e,)• 2 identified leptons + track (l)• “Tight” and “loose” e, categories
• 2 identified leptons + track (l)•+ l and (had decay)•“low-pT” and “high-PT” searches
• 3 identified leptons (e,)• 2 identified leptons + track (l)• “Tight” and “loose” e, categories
• 2 identified leptons + track (l)•+ l and (had decay)•“low-pT” and “high-PT” searches
3.2 fb-1
2.3 fb-1
~
~
~~ ~~
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0022 ±±
1 1 in trileptons: results in trileptons: results
Monica D'OnofrioExperimental Searches for SUSY at the
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DØ (2.3 fb-1)Channel SM expected
Data
CDF (3.2 fb-1)Channel SM expected
Data
Low pT 5.4 0.6 9
Trilepton 1.5 0.2 1
High pT 3.3 0.4 4
Lepton+trk 9.4 1.2 6
Good agreement between data and SM prediction set limit
[email protected] fb-1 results in PRL 101, 251801 (2008)
CDF excludes m±1
< 164 (155 Exp.)
GeV/c2
in the same scenario (with 2.3 fb-1)
DØ excludes m±1
< ~155 (160 Exp.)
GeV/c2
arXiv:0901.0646 (sub.to PLB, 2009)
Study dependency on other parameters - exclude 1
± of 130 GeV/c2 up to tan β =9.6
New!
CDF @ 2 fb-1
m0 = 60 GeV, tan 3, A0=0, >0m0 = 60 GeV, tan 3, A0=0, >0
~~ ~~
~
~ ~
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0022 ±±
1 1 in trileptons: resultsin trileptons: results
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excluded region in mSUGRA m0-m½ space
Key-points: • Lepton coverage in -selection • Luminosity: ~10-20 GeV/c2 gained per 1 fb-1
Key-points: • Lepton coverage in -selection • Luminosity: ~10-20 GeV/c2 gained per 1 fb-1
Use common benchmark scenario: tan(β)=3, A0=0, μ>0
New!
Limits depend on relative -l
masses m2 > ml increases BR to e/ m2 ≈ ml reduces acceptance
to lowest-pT lepton
~~ ~~
~~
~~ ~
~
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HeavyHeavy0022 ±±
1 1 production production
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Assume: m(20,1
±) > m(10)+m(W,Z)
Final state: e+e- pairs (Z), at least 2 jets (W) and Missing ET (> 40, 50, 60 GeV)
Main Background: Z+jets
observed cross sections ~ 1-3 pb
Missing ET > 40 GeV: Data: 7, SM Expected: 6.41 ± 0.95
M0 = 1000 GeV tan β= 10, >0
M0 = 1000 GeV tan β= 10, <0
W, Z bosons on shell
86 < Me+e- < 97 GeV/c2
60 < Mdijet < 95 GeV/c2
New!
L=2.7 fb-1
~~ ~~~~~
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Search for squarks and gluinosSearch for squarks and gluinos
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Search for squark and gluino pair production in final states with 2, 3, or 4 jets and Missing ET 2 jets + ET : qq → qq1
010 (mq < mg)
3 jets + ET : qg → qqq101
0 (mq ~ mg) 4 jets + ET : gg → qqqq1
010 (mq > mg)
Similar results for CDF and DØ, probing sparticle masses ~ 400 GeV/c2
~ ~~ ~~ ~~ ~
~ ~~ ~
~ ~~ ~~ ~~ ~
~ ~~ ~
PLB 660, 449 (2008) PRL 102, 121801 (2009)
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Squarks in Squarks in , jets and Missing E, jets and Missing ETT
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Assume large mixing scenario:• 1 is Next-LSP (“tau-corridor”)• m(g)>>m(q) qRqL dominates
Final states: • ≥ 2 Jets + Missing ET + ≥ 1 (hadronic decay)
Perform 2 analysis (-dijet, -multijet), then combined Optimization on Missing ET and ST = pj1
T + pj2T + E
T
~
Observed: 2 events Exp.: 1.7 0.2 (stat.) +0.6
-
0.3(syst.)
~ ~ ~ ~
Further combined with inclusive squark/gluino analysis in 2/3 jets final states: Exclude m(q) < 410 GeV
~
arXiv:0905.4086 Sub. to PLB
New!
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g-mediated b productiong-mediated b production
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~~ ~~
Light sbottom in large mixing scenarios Dedicated searches for b production If m(b)<m(g) (assuming B.R.bb100%)
Search for b from gluino decays (gg ~ 10 bb)
~
~
~
~~ ~~
~~
2 optimization regions depending on g-b mass difference
~~
Final state: Missing ET + 4 b-jets
Use b-tagging algorithm to identify at least 2 b-jets
2 Neural Network to reject background (top and QCD-multijets)
PRL 102, 221801 (2009)
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Stop searches Stop searches
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Lightest of the squarks
Can be lighter than the top quark due to the large SM top mass
2-, 3-body decays possible
Assumptions for stop searches at the Tevatron: Rp conservation, mstop< mtop
(a) 2-body: if and
(b) 2-body: if allowed
(c) 3-body:
011
~~ ct
vblt ~~1
11
~~mmm bt 1
01~~mmmm bWt
011~~~ bWbt
(a) (b) (c)
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Stop searches: Stop searches:
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Assume 100% B.R. Mass 0
1 in range [45-90] GeV Signature: 2 jets (at least one c-tagged) and Missing ET
011
~~ ct
Stop masses excluded up to 150 GeV/c2 if m(t)-m(01)>60
GeV/c2
~ ~
PLB 665, 1 (2008)
~
New results expected soon!
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Stop searches: Stop searches:
Monica D'OnofrioExperimental Searches for SUSY at the
Tevatron, 6/5/09 17
11~~ bt
Assume on-shell charginos: Signal topology depends on m = mt1 - m
Signature: Missing ET + 2 opposite-sign leptons + 2 b-jets (0 or ≥ 1 tag)
Main background: top production (dilepton) Reconstruct stop mass with a kinematic fit.
bt mmm 11~~
Limits for several dilepton BR for 115 < m(t1)<197 GeV, 44 <m(0
1)< 91 GeV. Fix to m(±1) =105.8 and
125.8 GeV
New!
~ ~
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Stop searches: Stop searches:
Monica D'OnofrioExperimental Searches for SUSY at the
Tevatron, 6/5/09 18
vblt ~~1
Assume sneutrino is LSP Signal topology depends on m = mt1 - m
Signature: Missing ET + 2 opposite-sign leptons + 2 b-jets CDF (1 fb-1): ee, e, ,DØ (1 fb-1):
ee, e
ee+e+
For large m: mt1 < 175 GeV (DØ)mt1 < 180 GeV (CDF)
~ ~
PLB 675, 289 (2009)New
!
~ ~
~~
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GMSB: GMSB: 0022 ±±
1 1 in in + Missing E+ Missing ETT
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G~~0
1
SUSY breaking at scale (10 -100 TeV) Squarks, gluinos and sleptons heavy Gravitino very light (<< MeV) and LSP Neutralino or slepton can be NLSP If NLSP is neutralino
In Rp conservation scenario: 2 NLSP 2+ MET (+X) final states
Assume 01 (NLSP) short-lived
Optimize the +MET analysis for 0 ns lifetime
Significant Missing ET and Large HT
HT = (EM objects) + ETjets +
Missing ET
Very low SM background Z , W l
New!
~~ ~~
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0022 ±±
1 1 in in + Missing E+ Missing ETT : results : results
Monica D'OnofrioExperimental Searches for SUSY at the
Tevatron, 6/5/09 20
Limits on neutralino mass VS lifetime
No excess observed
Mass(01)>149 GeV/c2 for ≤
2 ns (Expected: M(0
1)>141 GeV/c2)
New!
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““Non-Standard” SUSY SearchesNon-Standard” SUSY Searches
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Indirect searches: Bs Indirect searches: Bs
Monica D'OnofrioExperimental Searches for SUSY at the
Tevatron, 6/5/09 22
Sensitive to new physics: SUSY particles show up in loops (or direct decays if Rp violation)
SM: BR = 3.42 10-9
SUSY enhance ~(tan)6
CDF (2 fb-1): Br(Bs→)<5.8×10-8 @
95% CLDØ (2 fb-1): Br(Bs →)<9.3×10-8 @
95%CL
Expected Limits at 5 fb-
1(DØ): Br(Bs →)<5.3×10-8 @
95%CL
Unofficial CDF/DØ comb.: Br(Bs →)<4.5×10-8
New!
Expected Limits at 3.7 fb-
1(CDF): Br(Bs →)<3.3×10-8 @
95%CL
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Search for scalar neutrinosSearch for scalar neutrinos
Monica D'OnofrioExperimental Searches for SUSY at the
Tevatron, 6/5/09 23
Assume RP violation: possible production of single SuperPartner
Search strategy: look at high-mass unlike flavored lepton pairs: e(DØ), eehh (CDF)
probe the ijkMsneutrino parameter space
Update of PRL 100, 241803 (2008) (1. fb-1)
L=1 fb-1
Mass()=500 GeV/c2
σ x BR upper limits of 0.018 pb (eμ), 0.037 pb (eτ), 0.052 pb (μτ) for m() = 800 GeV (with λ'311 = 0.1, λ132=λ133= λ231=0.05)
limits on the σ x BR and RPV couplings λ’311 × λ312
for different sneutrino masses.
~
~
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Charged massive stable particlesCharged massive stable particles
Monica D'OnofrioExperimental Searches for SUSY at the
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Long-lived charginos are expected in some AMSB models
with a “wino-LSP” (small – 10 mass difference)
They would appear like slowly-moving muons
Make use of the time of flight information
CDF: Interpretation for strongly interacting charged massive particles,such as stops with a small stop- mass difference m(stop) > 250 GeV
DØ: interpretation for charged gauginos (higgsinos)
m > 206 GeV
m > 171 GeV
PRL 102 , 161802 (2009 )
arXiv:0902.1266 acc. by PRL
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Supersymmetric Hidden ValleysSupersymmetric Hidden Valleys
Monica D'OnofrioExperimental Searches for SUSY at the
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Mass
GeV
TeV
Visible sector
Hidden sector
SM
SU
SY
Dark
SU
SY
Mess
enger(
s)Phenomenology of SUSY HV similar to GMSB • Cascade to visible LSP• LSP decays into hidden sector
• Photon + dark LSP (X = darkino)• Dark photon(D )+ X (Missing ET)
• Dark photon (~GeV) decays into fermions• BR (0
1 /D X): free parameters
Hidden valley (HV) models: weakly coupled sector Motivated by recent results from PAMELA, ATIC, EGRET, FERMI-LAT,
HESS…
Final State: Missing ET, , a pair of spatially close leptons
Optimize for m(D) < 2.5 GeVnever been
investigated!
~~
~
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SUSY Hidden Valley: resultsSUSY Hidden Valley: results
Monica D'OnofrioExperimental Searches for SUSY at the
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Main background: Multijet events with
real/misidentified photons Wlwith real/misidentified
photons Set limits on chargino mass as a
function of the dark photon mass and BR(0
1 /D X):
m(D) = 1.4 GeV
arXiv:0905.1478 sub. to PRL
New!
~
BR=0.5
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Search for t’
Not only SUSY …Not only SUSY …
Monica D'OnofrioExperimental Searches for SUSY at the
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Many more models explored by CDF/DØ Extra-Dimensions, Lepto-quarks , New gauge bosons, 4th gen. b/t quarks, Compositness, Hidden Valleys …
Many more models explored by CDF/DØ Extra-Dimensions, Lepto-quarks , New gauge bosons, 4th gen. b/t quarks, Compositness, Hidden Valleys …
RS Graviton (m<944 GeVfor k/mp=0.1)
Search for G*, Z’, W’ in DiBoson Resonances
Search for B’
Search for 1st generation LQ in ejej
..and global searches carried out looking for the unknown
Search for high-mass narrow resonances in the diEM channel
RS Graviton (m<767 GeVfor k/mp=0.1)SM Z’ (m<944 GeV)
m(B’) < 325 GeV
m(t’) < 311 GeV
m(LQ) < 292 GeV
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Tevatron BSM Searches @ SUSY09 Tevatron BSM Searches @ SUSY09
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Biscarat Searches for Squarks and Gluinos Using Data from D0 Bhatti Search for Supersymmetry signatures in events with jets or photons at CDF Besancon Search for Charginos and Neutralinos with the D0 detector Strologas Search for trilepton SUSY signal at CDF Ivanov Searches in Dilepton Final States at CDF Ferapontov Searches for Extra Dimensions and for Heavy Resonances in Leptons, Photons, and MET Final States at D0 Goncharov Searches for extra dimensions at CDF Yoo Search for Anomalous Top Quark Production at D0 Moed Top Quark Production (including single top) at CDF Jabeen Search for New Physics Contamination in the Top Quark Samples at D0 Barfuss Searches for Leptoquark production in p p-bar collisions at the D0
experiment Johnson Search for Neutral Long-lived Particles Decaying to b-bbar at D0 Xie Search for Charged Massive Long-Lived Particles Using Data from D0 Culbertson Rare and exotic processes at CDF Gold Searches for new massive vector bosons with CDF Kraus Model Independent Search for New Physics in Leptonic Final States at D0 Gershtein Search for Hidden Valleys with Photons at D0 Ruiz-JimenoRecent results on Bs→μμ and other FCNC decays from the CDF experiment Mackin Search for the Lightest Scalar Top Quark at D0
Biscarat Searches for Squarks and Gluinos Using Data from D0 Bhatti Search for Supersymmetry signatures in events with jets or photons at CDF Besancon Search for Charginos and Neutralinos with the D0 detector Strologas Search for trilepton SUSY signal at CDF Ivanov Searches in Dilepton Final States at CDF Ferapontov Searches for Extra Dimensions and for Heavy Resonances in Leptons, Photons, and MET Final States at D0 Goncharov Searches for extra dimensions at CDF Yoo Search for Anomalous Top Quark Production at D0 Moed Top Quark Production (including single top) at CDF Jabeen Search for New Physics Contamination in the Top Quark Samples at D0 Barfuss Searches for Leptoquark production in p p-bar collisions at the D0
experiment Johnson Search for Neutral Long-lived Particles Decaying to b-bbar at D0 Xie Search for Charged Massive Long-Lived Particles Using Data from D0 Culbertson Rare and exotic processes at CDF Gold Searches for new massive vector bosons with CDF Kraus Model Independent Search for New Physics in Leptonic Final States at D0 Gershtein Search for Hidden Valleys with Photons at D0 Ruiz-JimenoRecent results on Bs→μμ and other FCNC decays from the CDF experiment Mackin Search for the Lightest Scalar Top Quark at D0
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ConclusionsConclusions
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CDF and DØ have a wide and rich program of SUSY searches: Continuously on-going updates of existing results using more
sophisticated techniques and more data Many more results expected for Summer’09 Covering “standard” and unusual scenarios, as well as the
“unconsidered” ones. No evidence of new physics yet, but.. expect to collect and
analyze up to 10 fb-1 of data in the next years Very promising projections GMSB: 10 fb-1
Bs
Stay tuned for more results from the Tevatron!
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Back-upBack-up
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Model independent searchesModel independent searches
Monica D'OnofrioExperimental Searches for SUSY at the
Tevatron, 6/5/09 31
Search for significant deviation from the SM CDF: Use both Vista (model-independent) and Sleuth
(quasi model-independent) to search for new phenomena in 2 fb-1
DØ: Similar Vista/Sleuth approach looking at lepton-based final states in 1 fb-1 : New
!
Out of 180 distributions, 4 significant deviations: + 2 jets + MET (9.3) + + 1 jet + MET (6.6) + MET (4.4) + (4.1)
Difficult modeling: none of these excesses are“sign” for new Physics (Trigger modeling,
Photon mis-identification rate modeling, MC simulation)
PRD 79, 011101 (2009)
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Global searches resultsGlobal searches results
Monica D'OnofrioExperimental Searches for SUSY at the
Tevatron, 6/5/09 32
DØ Sleuth Results (1 fb-1)Final state P
ℓ+ℓ′- + MET 2.9 E-6ℓ + MET 0.00082ℓ+ℓ′- 0.0031ℓ+τ- + MET 0.006ℓ+ τ+ 0.0066
5 most discrepant final states: P = probability that SM background for an individual final state would have a fluctuation at any cut that would be more significant than what is seen in data
No indication of physics beyond the Standard Model.