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Teruki Kamon
CMS Results:
Higgs and SUSY
December 2012 1 CMS: Higgs and SUSY
Mitchell Institute for Fundamental Physics and Astronomy
Texas A&M University
&
Department of Physics
Kyungpook National University
HEP Seminar, University of Tukuba
December 5, 2012
Higgs and SUSY
CMS & PFlow Algorithm
Higgs Analyses
– ZZ
– WW
– gg
– tt
– bb
– Combo
SUSY?
Summary
OUTLINE
December 2012 2 CMS: Higgs and SUSY
https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsHIG
December 2012 3 CMS: Higgs and SUSY
H
Who Wanted “Higgs Boson”?
December 2012 4 CMS: Higgs and SUSY
Authors Article F. Englert and R. Brout Phys. Rev. Lett. 13 (1964) 321
P. W. Higgs Phys. Lett. 12 (1964) 132
P. W. Higgs Phys. Rev. Lett. 13 (1964) 508
G. S. Guralnik, C. R. Hagen, and T. W. B. Kibble Phys. Rev. Lett. 13 (1964) 585
We Did …
The six authors of the 1964 PRL papers, who received the 2010 J. J. Sakurai Prize for
their work. From left to right: Kibble, Guralnik, Hagen, Englert, Brout. Right: Higgs.
December 2012 5 CMS: Higgs and SUSY
Production & Decays SM & MSSM
December 2012 6 CMS: Higgs and SUSY
URL: https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsHIG
Search Strategy
All the mass
range is
reachable
(actually large
part of it has
already been
excluded).
All channels
being
investigated.
December 2012 7 CMS: Higgs and SUSY
126 GeV
October 2010
December 2012 8 CMS: Higgs and SUSY
SUSY
December 13, 2011 Delivered by LHC : 5.72 fb-1
Recorded by CMS : 5.20 fb-1
(about 92%)
High quality data : 4.7 fb-1
December 2012 9 CMS: Higgs and SUSY
Keep in mind they are preliminary results; Keep in mind they are small numbers; Keep in mind we will run in the next year.
Newly approved
analysis including
VBF Hgg (was not
in the CERN
seminar)
Enhanced sensitivity
in the low mass
region
Global p-value (with
LEE) is 2.1 sigma
January 2012
December 2012 10 CMS: Higgs and SUSY
We have observed a new boson
with a mass of
125.3 ± 0.6 GeV at 4.9 s !
[GeV]4lm
Eve
nts
/ 3
GeV
0
2
4
6
8
10
12
[GeV]4lm
Eve
nts
/ 3
GeV
0
2
4
6
8
10
12 Data
Z+X
*,ZZgZ
=126 GeVHm
m, 2e2m7 TeV 4e, 4
m, 2e2m8 TeV 4e, 4
CMS Preliminary -1 = 8 TeV, L = 5.26 fbs ; -1 = 7 TeV, L = 5.05 fbs
[GeV]4l
m80 100 120 140 160 180
July 4, 2012
December 2012 11 CMS: Higgs and SUSY
Higgs Signal Strengths
Production and decay rates could be
deviated from the SM expectation
through SUSY particles in loop-
induced processes
Could be …
December 2012 12 CMS: Higgs and SUSY
SUSY
SUSY is : a) Supersymmetrized Standard Model
(“Democratic” solution between Fermions and Bosons);
b) An elegant solution to solve the problem associated with the Higgs mass around 1 TeV;
+
Unification!
c) Beautifully connecting the Standard Model with an ultimate unification of the fundamental interactions around 1 TeV;
d) Cosmologically consistent with a Dark Matter candidate around 1 TeV.
e) There must be a light Higgs boson:
below ~150 GeV.
13
Supersymmetry (SUSY)
CMS 2011 Physics
Very rare decays Searches for new physics with MET
Precision measurements
No signs of new physics (yet)
even in 2012
14 December 2012 14 CMS: Higgs and SUSY
FCNC in Bsmm
Br(Bsmm)
2
+
15
This is one of interesting rare decays to test new physics such as SUSY:
Br(Bsmm)SM ~ 3 x 10-9
Br(Bsmm)SUSY ~ Br(Bsmm)SM x (10 ~ 1000)
December 2012 15 CMS: Higgs and SUSY
LHCb at HCP2012
New
December 2012 16 CMS: Higgs and SUSY
Implications
[Light 3rd Generation SUSY Particles] Light stop direct stop production
Light stau direct EWKino production
[Lightest SUSY Particles] Higgsino LSP chargino and neutralinos below 200 GeV, with mass
splittings of order 10 GeV. It is very difficult for LHC to observe these
particles. See, for example, Papucci, Ruderman, Weiler, arXiv:1110.6926; Baer, Barger, Huang, Tata, arXiv:1203.553
[Ruling out Minimal Models] mGMSB and mAMSB are ruled out;
mSUGRA : A0 = 0 is ruled out; stau-neutralino is mostly ruled out. See, for example, Howard Baer, Vernon Barger, Azar Mustafayev, “Neutralino dark matter in mSUGRA/CMSSM with a 125 GeV light Higgs scalar”, JHEP 1205 (2012) 091, DOI: 10.1007/JHEP05(2012)091, e-Print: arXiv:1202.4038 [hep-ph]
[Moving to Non-minimal Models]
Where We Stand …
17 December 2012 CMS: Higgs and SUSY
SUSY Probe Metric at LHC
Minimal SUGRA
Non-Universal
SUGRA
),tan,,( 01/20
2~0
1
Ammh
D
),,tan,,( 01/20
2~0
1
m
Ammh D
July 4, 2012
E
Dec 13, 2011
Tevatron
Precision
We test a minimal case first, followed by “non-minimal” cases.
December 2012 18 CMS: Higgs and SUSY
December 2012 19 CMS: Higgs and SUSY
CMS Detector
g
m
g
m m
m
December 2012 20 CMS: Higgs and SUSY
CMS Detector
December 2012 21 CMS: Higgs and SUSY
Excellent tracker, High resolution EM calorimeter,
Redundant muon detector, Good hadron calorimeter
Particle ID
December 2012 22 CMS: Higgs and SUSY
Collider Detectors
ATLAS CMS CDF II D0 II
Magnetic
field
2 T solenoid +
toroid (0.5 T barrel
1 T endcap)
4 T solenoid +
return yoke
1.4T solenoid 2T solenoid
+ toroid (1.8T)
Tracker Si pixels, strips +
TRT
σ/pT ≈ 5x10-4 pT +
0.01
Si pixels, strips
σ/pT ≈ 1.5x10-4 pT +
0.005
Si strips + drift
chamber
Si strips +
scintillating fiber
EM
calorimeter
Pb+LAr
σ/E ≈ 10%/√E +
0.007
PbWO4 crystals
σ/E ≈ 3%/√E 0.003
Pb+scintillator
σ/E ≈ 13.5%/√E
0.015 in barrel
U+LAr
Hadronic
calorimeter
Fe+scint. / Cu+LAr
(10λ)
σ/E ≈ 50%/√E
0.03
Brass+scintillator (7
λ + catcher)
σ/E ≈ 100%/√E
0.05
Iron+scintillator
σ/E ≈ 50%/√E 0.03
in barrel
U+LAr (Cu or
stainless in outer
hadronic)
Muon σ/pT ≈ 2% @ 50GeV
to 10% @ 1TeV
(ID+MS)
σ/pT ≈ 1% @ 50GeV
to 10% @ 1TeV
(DT/CSC+Tracker)
Rapidities to 1.4 Rapidities to 2.0
December 2012 23 CMS: Higgs and SUSY
All physics objects (charged hadrons, neutral hadrons, g, e, m, t jets, MET) are reconstructed with the PF algorithm.
Basic idea:
– Reconstruct and identify all different types of particles
– Apply corresponding calibrations
– The list of “particles” is given to the jet clustering and missing ET
(MET) reconstruction algorithm
Particle Flow (PF) Algorithm
December 2012 24 CMS: Higgs and SUSY
Particle Flow (PF) Algorithm
Improvements in all the reconstructed objects
Jets and MET : resolution and energy scale improved by 2-5
times w.r.t. calorimeter based reconstruction
Lepton isolation : background rejection improved by a factor 2 at
same efficiency
Exellent reconstruction and identification for th
See the following pages for basic concept December 2012 25 CMS: Higgs and SUSY
All physics objects (charged hadrons, neutral hadrons, g, e, m, t jets, MET) are reconstructed with the PF algorithm.
Basic idea:
– Reconstruct and identify all different types of particles
– Apply corresponding calibrations
– The list of “particles” is given to the jet clustering and missing ET
(MET) reconstruction algorithm
Charged hadrons
~65% of jet energy
Use the high resolution tracker
~1% at 100 GeV
December 2012 26 CMS: Higgs and SUSY
Photons
~25% of jet energy
Use high resolution / good
granularity ECAL
Granularity: 0.02 ()
Energy resolution: ~2%/E
December 2012 CMS: Higgs and SUSY
Neutral hadrons
~10% of jet energy
Use HCAL
Granularity: 0.1 ()
Energy resolution: ~100%/E
December 2012 CMS: Higgs and SUSY
Jet:
Charged hadron (solid)
Photon (dashed line)
Neutral hadron (dotted line)
Particles clustered in jets
December 2012 CMS: Higgs and SUSY
December 2012 30 CMS: Higgs and SUSY
7 TeV: Phys. Lett. B 710 (2012) 403
7+8 TeV: Phys. Lett. B 716 (2012) 30
and CMS-HIG-12-015
and https://twiki.cern.ch/twiki/bin/view/CMSPublic/Hig12015TWiki
December 2012 31 CMS: Higgs and SUSY
L = 5.1 fb-1 (7 TeV) + 5.3 fb-1 (8 TeV)
pT1 > m(gg)/3 & pT2 > m(gg) /4 ; M = 2Eg1 Eg2 (1 – cosq) Photon ID MVA based on shower topology and isolation;
Di-photon MVA classifications with signal-like
kinematics, good mass resolution, per-event vertex
probability, photon-likelihood.
6 categories optimized for the best expected limits (4 di-
photon MVA categories; 2 di-jet tagged categories).
Backgrounds are fit to data Irreducible BG: pp gg
Photon + jet: pp gj g “g”
Dijet : pp jj “g” “g”
Z ee “g” “g”
Fakes – largely controlled by isolation, lateral shower shapes,
electron track veto, Ehad/Eg
BDT trained on simulated Higgs and g+jet events
Highlights of Di-photon Analysis
December 2012 32 CMS: Higgs and SUSY
PbWO4 Crystals in CMS
December 2012 33 CMS: Higgs and SUSY
M(gg) Resolution : dE/E
December 2012 34 CMS: Higgs and SUSY
5x5 crystals
3x3 crystals
(uncorrected) 3x3 crystals
(corrected)
Simulation
Calibration
December 2012 35 CMS: Higgs and SUSY
Calibration
December 2012 36 CMS: Higgs and SUSY
M(gg) Resolution : Vertexing
December 2012 37 CMS: Higgs and SUSY
pT1 > m(gg)/3 & pT2 > m(gg) /4
Photon ID using MVA based on
shower topology and isolation;
Di-photon MVA classifications
with signal-like kinematics, good
mass resolution, per-event
vertex probability, photon-
likelihood.
6 categories optimized for the
best expected limits (4 di-photon
MVA categories; 2 di-jet tagged
categories).
BDT trained on simulated Higgs
and g+jet events
Di-photon Categories
December 2012 38 CMS: Higgs and SUSY
Di-jet tagged Di-Photon
Two (one in 2011) classes of events (according to mjj) with S/B an order
of magnitude larger than inclusive classes Sensitivity increases by
10% December 2012 39 CMS: Higgs and SUSY
Decay products
Highest energy jets in the event selected with large pseudo-rapidity
gap Enriches in VBF content and rejects background
Di-photon BG Modeling Background model fit to the m(gg) distribution for the 6 categories,
together with a simulated signal (mH = 125 GeV). The sum of the event
classes together with the sum of the five fits is also shown.
Background modeling: polynomial shape with order from 3 to 5.
Potential bias from background model is less than 20% of statistical
uncertainty.
December 2012 40 CMS: Higgs and SUSY
[First 4 classes] A 5th order polynomial function in 100-180 GeV is found to be unbiased in either excluding or finding the Higgs boson signal, compared to the statistical uncertainties of the fit. [VBF] A 2nd (3rd) order polynomial function
[Consistency check] The di-photon mass spectrum that is observed after the full event selection is found to agree with the distribution predicted by MC simulation, within the uncertainties on the cross sections of the contributing processes which is estimated to be about 15%.
Di-photon BG Modeling
Cat 0 Cat 1 Cat 2
Cat 3
December 2012 41 CMS: Higgs and SUSY
VBF tight VBF loose
Di-photon S/B-weighted Mass
Each event class is weighted by its S/(S+B) only for
visualization purpose
December 2012 42 CMS: Higgs and SUSY
Mgg= 125.1 GeV 0.4 (stat) 0.6 (syst)
July 4: 125.3 ± 0.6 GeV (stat+syst)
Di-photon : P-Value
125 GeV … The largest excess (above the expected SM background) for
a Higgs boson mass hypothesis with a local significance of 4.1 sigma.
The global significance of observing an excess with a local significance
greater than 4.1 sigma anywhere in the search range 110-150 GeV is
estimated to be 3.2 sigma.
December 2012 43 CMS: Higgs and SUSY
Di-photon Signal Strength
Combined best-fit signal strength for
a SM Higgs boson mass hypothesis of
125 GeV:
s/sSM = 1.56 + 0.43
Signal strength is compatible across
signal categories.
December 2012 44 CMS: Higgs and SUSY
1
Di-photon Summary Expected exclusion limits on s x Br(HSMgg) at 95% CL are
0.76 times the SM cross section at ~125 GeV.
The SM Higgs boson (HSMgg) in the mass ranges [114-
211], [129-132], [138-149] are excluded at 95% CL.
The largest excess above the expected SM background is
observed for a Higgs boson mass hypothesis of 125.1
0.4 (stat)0.6 (syst) GeV with a local (global) significance
of 4.1 (3.2) sigma.
More data are required to ascertain the nature of this
excess.
December 2012 45 CMS: Higgs and SUSY
December 2012 46 CMS: Higgs and SUSY
H ZZ
HZZ4l / 2l2tau (l = e, mu) 5.1 fb-1 (7 TeV, 2011) + 12.2 fb-1 (8 TeV, 2012)
CMS Public Analysis Summary HIG-12-041
HZZ2l2nu 5 fb-1 (7 TeV, 2011) + 5 fb-1 (8 TeV, 2012)
CMS Public Analysis Summary HIG-12-023
HZZ2l2q 5 fb-1 (7 TeV, 2011)
CMS Public Analysis Summary HIG-11-027,
http://arxiv.org/abs/1202.1416, JHEP 04 (2012) 036
December 2012 47 CMS: Higgs and SUSY
H ZZ 4l : Selection
December 2012 48 CMS: Higgs and SUSY
H ZZ 4l : Candidates
December 2012 49 CMS: Higgs and SUSY
H ZZ 4l : m4l
Good agreement between predicted
and observed ZZ continuum.
Z 4l peak is in place and in
agreement with prediction.
Fit of the Z 4l peak shows
δm ~ 0.4 ± 0.28 GeV
and expected resolution.
X ZZ 4l peak is
there and increasing
in statistics
corresponding to
luminosity and
expectation of H ZZ
4l
For m4l = 121.5 ... 130.5 GeV:
o Expected background: 6.5
events
o Expected signal (mH = 126 GeV):
12.5 events
o Signal:Background ~ 2:1
o Observed: 17 events
December 2012 50 CMS: Higgs and SUSY
A A B
17 events
Kinematic Discriminants (KD) To enhance signal vs. background discrimination
Validated with independent implementations of the kinematic discriminants
either using directly the matrix element from JHUGen, MCFM, MADGRAPH,
or CalcHEP, standalone or within the generalized MEKD framework, or using
the Boosted Decision Trees (BDT) multivariate classification technique
trained with the MC samples, and similar performance was observed.
December 2012 51 CMS: Higgs and SUSY
A
B
H ZZ 4l : KD Observed data points (with event-by-event calculated m(4l)-errors) in
black on top of background (left) and the SM Higgs signal at 126 GeV
expectations.
Two approaches checked: simple 1D (mass) fit to discriminate between
signal and background and 2D using: )m|K(P)m(P)K,m(P l4Dl4Dl4
December 2012 52 CMS: Higgs and SUSY
A
B
H ZZ 4l : p-value
7 TeV and 8 TeV: consistent growth of
the peak around 125 GeV.
P-value corresponds to 4.5s.
(ICHEP was: 3.2s)
Other peaks: random fluctuations
(look-elsewhere effect).
December 2012 53 CMS: Higgs and SUSY
1D (m4l) results vs. 2D (KD+m4l).
H ZZ 4l : JP
December 2012 54 CMS: Higgs and SUSY
0+
0-
17 events
H ZZ 4l : JP
0+ vs. 0-:
Expected separation: 1.93 σ
Observed:
0- : is consistent with
observation within 2.45 σ
(2.4% using CLs)
0+ : is within 0.53 σ
December 2012 55 CMS: Higgs and SUSY
H ZZ 4 leptons: Mass
Measured mass:
126.20.6(stat.) 0.2(syst.)
GeV
Uncertainty dominated by
statistical component e
“free” improvement next time
we update results.
Systematics: dominated by
resolution uncertainty.
-‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--Note: Same mass with worse
precision obtained w/o KD or
event-by-event errors as
extra dimensions.
3D Fit (m4l, KD, dm4l)
December 2012 56 CMS: Higgs and SUSY
H ZZ 4l+2l2tau
Even if we already likely
found the SM Higgs boson...
Limit results for the whole
mass interval are:
Check for consistency (vs.
SM prediction)
One could also re-use
limits by re-scaling to s*BR
of a preferred model.
December 2012 57 CMS: Higgs and SUSY
H ZZ 2l2nu
Best “exclusion channel”:
back in 2011 excluded widest
interval of possible masses
with a handful of data.
ICHEP 2012 results: 273-600
GeV excluded.
December 2012 58 CMS: Higgs and SUSY
H ZZ Summary 4.5 sigma of local significance for m(X) ~ 126 GeV
Signal strength: 0.8 +0.35 -0.28 at 126 GeV
0- is consistent with observation within 2.45 sigma (2.4%
using CLs)
0+ is consistent within 0.5 sigma
Upper limits at 95% confidence level exclude the SM
Higgs boson in the ranges 113–116 GeV, 129–720 GeV
(together with 2l2tau).
Agreement with the SM prediction in the whole mass
range.
Results are consistent with previous publications and
with expectations.
December 2012 59 CMS: Higgs and SUSY
December 2012 60 CMS: Higgs and SUSY
Observed Upper Limits HIG-12-045
December 2012 61 CMS: Higgs and SUSY
125
P-Values HIG-12-045
December 2012 62 CMS: Higgs and SUSY
125
Signal Strengths HIG-12-045
December 2012 63 CMS: Higgs and SUSY
Signal Strength
December 2012 64 CMS: Higgs and SUSY
December 2012 65 CMS: Higgs and SUSY
--
--
-
-
0
0
0
0
2
1
0
m
m
scMssM
ccMcsM
scMccMM
ssMcsMM
WZWZ
WZWZ
WZWZ
WZWZ
~Μ
New to Probe h2
Light stop + Higgsino LSP
December 2012 66 CMS: Higgs and SUSY
SUSY World with Lighter 3rd Generation SUSY Particles? Light stop direct stop production
Light stau direct EWKino production
How to Probe Colorless SUSY Sector? 1) Tagging energetic jets (+ MET) from cascade decays
2) Tagging leptons
VBF as a SUSY Probe
What to do with (i) heavy
1st/2nd generation squarks
and gluino, and (ii) small
M?
December 2012 67 CMS: Higgs and SUSY
What to do with (i) heavy
1st/2nd generation squarks
and gluino, and (ii) small
M? 3) VBF (arXiv:1210.0964)
Bhaskar Dutta, Alfredo Gurrola,
Will Johns, Teruki Kamon,
Paul Sheldon, Kuver Sinha
SUSY World with Lighter 3rd Generation SUSY Particles? Light stop direct stop production
Light stau direct EWKino production
How to Probe Colorless SUSY Sector? 1) Tagging energetic jets (+ MET) from cascade decays
2) Tagging leptons
December 2012 68 CMS: Higgs and SUSY
VBF as a SUSY Probe
Higgs Signal Strengths
Production and decay rates could be
deviated from the SM expectation
through SUSY particles in loop-
induced processes
Could be …
SUSY
December 2012 69 CMS: Higgs and SUSY
SUSY VBF at the LHC
))((pp01
0111 tt ++++ ~~jj~~jj
t decay products
arXiv:1210.0964
2 fb
December 2012 70 CMS: Higgs and SUSY
VBF Diagrams ++ WjjWpp
++ 11pp ~~jj
December 2012 71 CMS: Higgs and SUSY
VBF Kinematics
Large MET, large M(jj), large pT jets
arXiv:1210.0964
)( 21 j,jM TE
)( 1jpT
GeV 30)()(
GeV 90)(
GeV 180)()(
011
01
021
-t
+
+
~M~M
~M
~M~~M
Benchmark Point:
Baseline “VBF + MET” Selection:
See the next page …
December 2012 72 CMS: Higgs and SUSY
Baseline VBF+MET Selection
GeV 75 MET GeV; 650)(
0 ;24
GeV 75 )(jp GeV; 50(j)p with jets 2
21
21
1TT
j,jM
.
2 Scenarios
30 GeV 30 GeV
December 2012 73 CMS: Higgs and SUSY
Case 1: Taus via VBF
))((pp01
0111 tt ++++ ~~jj~~jj ))((pp
01
01
021
-+++ ttt ~~jj~~jj
December 2012 74 CMS: Higgs and SUSY
Tau Selection
-1fb 25
20 GeV
Benchmark Point
1% f 55%;
)12( 20/20p with taus 2 T
t
.
December 2012 75 CMS: Higgs and SUSY
Tau Trigger 20 GeV
30 GeV
25 GeV
December 2012 76 CMS: Higgs and SUSY
2Taus+2Jets+MET
2.41
1.77
1.66
BS/S +
BS/S +
BS/S +
December 2012 77 CMS: Higgs and SUSY
Case 2: Muons in VBF
))((pp01
0111 mm ++++ ~~jj~~jj
)12( 20/15p with muons isolated 2 T .
December 2012 78 CMS: Higgs and SUSY
2Muons+2Jets+MET
BS/S +
BS/S +
BS/S +
6.05
4.46
4.15
December 2012 79 CMS: Higgs and SUSY
Case 1 vs. Case 2 )12( 20/15)(pT .m
1% f 55%;
)12( 20/20)(pT
t
t
.
Lower pT cuts help..
December 2012 80 CMS: Higgs and SUSY
Sleptons via VBF (at 14 TeV)
Z/g
~
~
t~
[Taken from Fig. 2 of arXiv:9912232]
slepton production cross sections at 14
TeV. They are pointing out that slepton
pairs produced via VBF in anomaly
mediated supersymmetry breaking (AMSB)
model have very characteristic and almost
clean signal at the LHC.
2 fb
~
t~
Z/g
December 2012 81 CMS: Higgs and SUSY
(e.g.) Light Stau Phenomenology arXiv:1205.5842
Marcela Carena, Stefania Gori, Nausheen R. Shah,
Carlos E. M. Wagner, Lian-Tao Wang
Complementary Slepton Searches via VBF
~10 fb (VBF)
14 TeV LHC
December 2012 82 CMS: Higgs and SUSY
(e.g.) Higgs in pMSSM arXiv:1206.5800
Matthew W. Cahill-Rowley, JoAnne L. Hewett, Ahmed Ismail, Thomas G. Rizzo
400
Complementary Charginos/Neutralinos Searches via VBF December 2012 83 CMS: Higgs and SUSY
Summary Difficult to detect charginos, neutralinos, sleptons with
mass splitting of order 10-20 GeV at the LHC.
VBF trigger: two forward jets
with pT >~50 GeV, || >~4 and
M(jj) >~700 GeV.
VBF processes: a complementary way to probe low mass
colorless SUSY states at the LHC even at 8 TeV (14 TeV).
We could probe charginos (sleptons) directly up to 200
GeV (~500 GeV) with 20-25 fb-1 (100 fb-1).
t decay products
December 2012 84 CMS: Higgs and SUSY
December 2012 85 CMS: Higgs and SUSY
PPC Cube
Indirect DM
Search
Dark Matter
DM Search at
Collider
Direct DM
Search
• What are we made of?
• Is the dark matter a new particle?
• How to detect the dark matter?
• Interconnection between particle physics and cosmology
US Department of Energy (DOE); Korea National Research Foundation (NRF); SFB Fellowship (Hamburg University/DESY)
December 2012 86 CMS: Higgs and SUSY
Interconnection between Particle Physics and Cosmology
Interconnection between Particle Physics and Cosmology
PPC 2011 at CERN, June 14-18
PPC 2012 at KIAS, Korea, Nov. 5-9
PPC 2013 in ???
“PPC”
PPC Cube
December 2012 87 CMS: Higgs and SUSY
CBS comedy “Big Bang Theory”
(Season 1 Episode 15)
December 2012 88 CMS: Higgs and SUSY
Interconnection between Particle Physics and Cosmology
© Premiere Props
2007
2012
2008
2009
2010
2011
December 2012 89 CMS: Higgs and SUSY
PPC Cube Evolution
My Life Style
1
2
3
0 Mitchell Institute for Fundamental Physics and Astronomy
4
SFB Program WCU Program
Teruki Kamon 90 PPC
1
2
3
0 Mitchell Institute for Fundamental Physics and Astronomy
4
SFB Program WCU Program
Teruki Kamon 91 PPC
De-evolution
I feel like a Backpacker …
Backup
December 2012 92 CMS: Higgs and SUSY
December 2012 93 CMS: Higgs and SUSY
H WW l l 12 fb-1 (8 TeV)
No signal mass peak counting experiment
Challenge = remove & control large backgrounds
Signal characteristics:
Only 2 opposite sign, isolated leptons
Significant MET No mass peak
No b-jets, no additional low PT μ
With additional 0, 1 or 2 jets (VBF)
Small ΔΦ(l+l-) due to Higgs scalarity
Selection cuts
Tight lepton ID
Large MET & Z veto
Classification by # of jets (PT > 30 GeV)
& b-jet veto
Kinematic discriminants: M(ll) & ΔΦ(l+l-)
m(H)-dependent cut optimization
December 2012 94 CMS: Higgs and SUSY
0-jet
1-jet
8 TeV
7+8 TeV
December 2012 95 CMS: Higgs and SUSY
H WW l l
Sizable Excess !!
Expected (Observed) Significance
of 4.3 (3.1) sigma! Best fit value for signal strength :
0.74 + 0.25
H WW l l
December 2012 96 CMS: Higgs and SUSY
H WW l qq
8 TeV
Exclusion range: 215--‐490 and 525--‐600 GeV at 95% CL
7+8 TeV
December 2012 97 CMS: Higgs and SUSY
HWW Summary Both single-lepton and di-lepton channels with 12 fb-1 of 8
TeV luminosity
Heavier masses are excluded at 95% CL
3.1 sigma excess at light masses (with 4.1 sigma expected)
First observation of Higgs-like boson in WW mode
December 2012 98 CMS: Higgs and SUSY
CMS PAS HIG-12-043, CMS PAS HIG-12-051
December 2012 99 CMS: Higgs and SUSY
L = 17 fb-1 (7+8 TeV)
5 Inclusive Di-Tau Analyses : eth, mth, em, mm, thth
2 Explicit Analyses of the production: WH ad ZH
5 “event topology” categories to have enriched signal-to-
background ratio and maximize the sensitivity
Limit based on the fit of the full mass distribution
Highlights of Di-Tau Analysis
December 2012 100 CMS: Higgs and SUSY
Tau Reconstruction / ID
December 2012 101 CMS: Higgs and SUSY
MET
December 2012 102 CMS: Higgs and SUSY
Di-Tau System
December 2012 103 CMS: Higgs and SUSY
Dominant Backgrounds
December 2012 104 CMS: Higgs and SUSY
Tau pT = 69 GeV
MET = 97 GeV
Muon pT = 20 GeV
Jet2 pT = 46 GeV
Jet1 pT = 177 GeV
VBF Candidate
December 2012 105 CMS: Higgs and SUSY
VBF Category
December 2012 106 CMS: Higgs and SUSY
Sensitivity
December 2012 107 CMS: Higgs and SUSY
Observed Limit (incl. Htt)
December 2012 108 CMS: Higgs and SUSY
WH and ZH
December 2012 109 CMS: Higgs and SUSY
Observed Limits (Combined)
December 2012 110 CMS: Higgs and SUSY
Signal Strength
December 2012 111 CMS: Higgs and SUSY
Di-Tau Summary Sensitive to both the SM Higgs boson and to the neutral
Higgs bosons predicted by the MSSM.
Compatible with the SM Higgs boson signal at 125 GeV
with background only hypothesis.
Signal strength : 0.72 + 0.52
December 2012 112 CMS: Higgs and SUSY
http://cdsweb.cern.ch/record/1421611?ln=en
December 2012 113 CMS: Higgs and SUSY
L = 4.7 fb-1
5 channels: W(m)H, W(e)H, Z(mm)H, Z(ee)H, Z()H,
along with 2 b-tagged jets
Combined Secondary Vertex (CSV) b-tagging algorithm
(CMS-BTV-09-001) CSV > 0.90 (b) = 50%, (c) = 6%, (f) = 0.15%
CSV > 0.50 (b) = 72%, (c) = 23%, (f) = 3%
Impressive result where SF are validated up to pT ~ 600 GeV
Event selection,
optimized by BDT
Highlights of VH(bb) Analysis
December 2012 114 CMS: Higgs and SUSY
VH(bb) Event Selection BDT and m(jj) Analysis Cuts
December 2012 115 CMS: Higgs and SUSY
H(bb) Mass and Summary
No significant excess of events above the expectation from
background. Upper limits on the s(VH)*Br(Hbb), with respect to the
expectations for a SM Higgs boson, are derived for a Higgs boson in the
mass range 110–135 GeV. In this range, the observed 95% CL upper
limits vary from 3.4 to 7.5 times the SM prediction; the corresponding
expected limits vary from 2.7 to 6.7.
BDT Analysis m(jj) Analysis
December 2012 116 CMS: Higgs and SUSY