Search for associated top/Higgs production at CMS

(1)

Search for associated

top/Higgs production at CMS

Lorenzo Bianchini (ETH Zurich)

on behalf of the CMS Collaboration

1

3 July 2014,

ICHEP2014, Valencia

Thursday, July 3, 14

(2)

Experimental challenge posed by:

‣

low signal cross section

‣

large irreducible SM background

-

often challenging at NLO

‣

complicated final states

2

Motivation

• Precise knowledge of Yukawa coupling Y

t

crucial for characterization of H(125)

‣

H + top quark(s) sensitive to Yt at tree-level

-

^gg/qq^➝^{ttH [ σ}^SM = 130 fb ]

-

^qb^➝ tHq [ σSM = 18 fb ]

• Effort to extend top/Higgs search to more

final states + improvement of existing analyses

‣

~90% of H decays covered by dedicated analyses

bb γγ

WW

ZZgg ccττ

SM BRs for mH=125 GeV

(3)

3

Overview of CMS analyses

H ➝ bb

H ➝ bb H ➝ττ H ➝ττ

H ➝ WW

^*

/ZZ

^*

H➝γγ H ➝ bb

H ➝ bb

τ

had

τ

had

lτ

had

τ

had

τ

had

lτ

had

H ➝ WW

^*

/ZZ

^*

H➝γγ

ttH

H ➝ hadrons 7+8 TeV

CMS-PAS-HIG-12-035 JHEP 1305 (2013) 145 CMS-PAS-HIG-13-019 CMS-PAS-HIG-14-010

H ➝ leptons ( 

^±



^±

, 3  , 4  )

8 TeV

CMS-PAS-HIG-13-020 H ➝ leptons

( 

^±



^±

, 3  , 4  )

8 TeV

CMS-PAS-HIG-13-020

H ➝ photons

7+8 TeV

CERN-PH-EP-2014-117

tH 8 TeV in progress

8 TeV

CMS-PAS-HIG-14-001

(4)

4

Overview of CMS analyses

H ➝ bb

H ➝ WW

^*

/ZZ

^*

H➝γγ H ➝ bb

H ➝ bb

τ

had

τ

had

lτ

had

τ

had

τ

had

lτ

had

H ➝ WW

^*

/ZZ

^*

H➝γγ

ttH

H ➝ leptons ( 

^±



^±

, 3  , 4  )

8 TeV

( 

^±



^±

, 3  , 4  )

8 TeV

CMS-PAS-HIG-13-020

H ➝ photons

7+8 TeV

CERN-PH-EP-2014-117

8 TeV

CMS-PAS-HIG-14-001

Combination of ttH searches (see M. Chen’s talk on Friday) CMS-PAS-HIG-14-009

(5)

5

H ➝ bb

H ➝ WW

^*

/ZZ

^*

H➝γγ H ➝ bb

H ➝ bb

τ

had

τ

had

lτ

had

τ

had

τ

had

lτ

had

H ➝ WW

^*

/ZZ

^*

H➝γγ

ttH

H ➝ hadrons 7+8 TeV

H ➝ leptons ( 

^±



^±

, 3  , 4  )

8 TeV

( 

^±



^±

, 3  , 4  )

8 TeV

CMS-PAS-HIG-13-020

H ➝ photons

7+8 TeV

CERN-PH-EP-2014-117

8 TeV

CMS-PAS-HIG-14-001

New ttH( bb ) analysis of 8 TeV data

Overview of CMS analyses

(6)

H ➝ hadrons

(bb/ ττ , 7+8 TeV)

6

(7)

H ➝ hadrons analysis

0 2 4 6 8 10 12 14 16

Events

10 102

103

104

105

= 8 TeV, L = 19.5 fb-1

s CMS Preliminary

): LJ + DIL + TAU τ

ttH(bb,τ Pre-Fit

channel and category

6j2t LJ

4j3t LJ

5j3t LJ

6j3t LJ

4j4t LJ

5j4t LJ

6j4t LJ 3j2tDIL

4j2tDIL 3tDIL

4j1t TAU

5j1t TAU

6j1t TAU

4j2t TAU

5j2t TAU

6j2t TAU

Data/MC

0 1

2 Stat+Syst Uncertainty B-only p-value (^χ²^{) = 0.001}

7

CMS-PAS-HIG-13-019

H ➝ τ

_had

τ

_had

tt ➝  νjjbb

H ➝ bb tt ➝  ν  νbb

H ➝ bb tt ➝  νjjbb

Split each channel into exclusive (N

jet

, N

b-tag

) categories

‣

large values of Njet and/or Nb-tag provide better S/B

‣

reducible backgrounds constrained by lowest jet bins

‣

separate S/B using BDTs

-

object kinematics, event shape, b-tagging

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6

Events

5 10 15 20 25 30 35 40 45

= 8 TeV, L = 19.5 fb-1

s CMS Preliminary

4 b-tags 6 jets + ≥

Lepton + ≥ Post-Fit (S+B)

BDT output -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6

Data/MC

0 1

2 Fit ±1σ Fit ±2σ ^{p-value (}^χ²^{) = 0.688}

μ/e+jets

H(125) x 30 t

t

+ lf t t

c + c t t

+ b t t

b + b t

tSingle t + W,Z t

t

EWK

Bkg. Unc.

Data

Backgrounds:

• experimental: tt+LF

• irreducible: tt+HF, ttZ

(8)

H ➝ leptons

(WW * /ZZ * / ττ , 8 TeV)

8

(9)

9

H ➝ leptons: channels

Tag Higgs decays to W/Z bosons or τ’s, followed by ≥1 leptonic decay

‣

full event reconstruction too demanding, but spectacular signatures:

-

use SS or multi-lepton signatures to suppress backgrounds:

CMS-PAS-HIG-13-020

t

b

W⁺

ν_!

"⁺

¯t

b¯ W⁻

q

¯ q

H Z

Z

"⁻

"⁺

q

¯ q g

g t

b

W⁺

ν_!

"⁺

¯t

b¯ W⁻

q

¯ q H

τ⁺

τ⁻

"⁺ ν_!

¯ ν_τ

ν_τ τ_h g

g

t

b

W⁺

ν_!

"⁺

¯t

¯b W⁻

"⁻

¯

ν_!

H W⁺ W⁻

ν_!

"⁺

"⁻

¯

ν_!

g

e/μ

= 2

(SS) = 3 = 4

JETS TAGS

≥4

≥1 ≥2

≥1

≥2

≥1

Backgrounds:

• experimental (tt+fake leptons)

• irreducible (tt+Z/W, VV+jets)

(10)

10

H ➝ leptons: analysis

N(jet)

Events

0 0.5 1 1.5

2 2.5 3

Data ttH

* γ ttZ/

ZZ Fakes Others

CMS Preliminary, 4l channel s = 8 TeV, L = 19.6 fb^-1

N(jet)

1.5 2 2.5 3 3.5

Data/Sim.

0 1 2 3 4

BDT output

Events

0 5 10 15 20

25 ^Data_ttH

ttW γ* ttZ/

ttγ WZ Others Fakes Q Flip

channel µ±

CMS Preliminary, e± s = 8 TeV, L = 19.6 fb^-1

BDT output

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

Data/Sim.

0 1 2

BDT output

Events

0 5 10 15 20

25 ^Data_ttH

ttW

* γ ttZ/

WZ Others Fakes

channel µ±

µ±

CMS Preliminary, s = 8 TeV, L = 19.6 fb^-1

BDT output

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

Data/Sim.

0 1 2 3

BDT output

Events

0 5 10 15 20 25 30

35 ^Data_ttH

ttW γ* ttZ/

ttγ WZ Others Fakes CMS Preliminary, 3l channel s = 8 TeV, L = 19.6 fb^-1

BDT output

-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6

Data/Sim.

0 1 2 3

Use larger jet activity in ttH events as a extra handle for S/B separation

‣

^N^jetmost separating variable

‣

combine w/ other variables into a BDT



^±



^±



^∓



^±



^±



^∓



^∓

e

^±

μ

^±

μ

^±

μ

^±

CMS-PAS-HIG-13-020

(11)

11

H ➝ leptons: analysis

N(jet)

Events

0 0.5 1 1.5

2 2.5 3

Data ttH

* γ ttZ/

ZZ Fakes Others

CMS Preliminary, 4l channel s = 8 TeV, L = 19.6 fb^-1

N(jet)

1.5 2 2.5 3 3.5

Data/Sim.

0 1 2 3 4

BDT output

Events

0 5 10 15 20

25 ^Data_ttH

ttW γ* ttZ/

ttγ WZ Others Fakes Q Flip

channel µ±

CMS Preliminary, e± s = 8 TeV, L = 19.6 fb^-1

BDT output

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

Data/Sim.

0 1 2

BDT output

Events

0 5 10 15 20

25 ^Data_ttH

ttW

* γ ttZ/

WZ Others Fakes

channel µ±

µ±

BDT output

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

Data/Sim.

0 1 2 3

BDT output

Events

0 5 10 15 20 25 30

35 ^Data_ttH

ttW γ* ttZ/

ttγ WZ Others Fakes CMS Preliminary, 3l channel s = 8 TeV, L = 19.6 fb^-1

BDT output

-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6

Data/Sim.

0 1 2 3

Use larger jet activity in ttH events as a extra handle for S/B separation

‣

^N^jetmost separating variable

‣

combine w/ other variables into a BDT



^±



^±



^∓



^±



^±



^∓



^∓

e

^±

μ

^±

μ

^±

μ

^±

CMS-PAS-HIG-13-020

Broad excess of signal-like events in μ

^±

μ

^±

channel

(12)

H ➝ photons (7+8 TeV)

12

(13)

13

ttH(γγ) production CERN-PH-EP-2014-117

• Signal extracted from fit to m

γγ

spectrum

• Contamination from other Higgs productions: ~10%

• Small systematics

Select events with 2 photons + ≥2 jets (≥1 tags)

‣

tag exclusive top decay channels

-

at least one lepton OR zero leptons

(14)

14

tH(γγ) production

CMS-PAS-HIG-14-001

• No events observed neither in mass sideband nor in signal region

‣

expected (observed) limit: 4.1 times cross-section for Yt = -YtSM

‣

not yet sensitivity to SM tH production

t W

t H

b q

b W

γ γ q^!

Tag H ➝γγ in coincidence with 1 leptonic top decay

‣

require additional forward jet (|η|>1.0)

‣

important channel for breaking Yt sign ambiguity

Backgrounds:

• resonant: ttH(γγ) from MC

• non-resonant: from m

γγ

sidebands

(15)

Results & combination (7+8 TeV)

15

CMS-PAS-HIG-14-009

(16)

16

Combination of ttH searches

Combination of ttH tagged channels

‣

best fit value from ttH tagged channels is 2.76 -0.92/+1.05

‣

compatible with SM expectation (μ=1) at 2.0σ level

‣

excess driven by SS di-muon and H(γγ) channels

CMS-PAS-HIG-14-009

Channel μ^fit Δμ^fit

ttH, H➝bb 0.65 -1.8/+1.8

ttH, H➝τ_hadτ_had -1.3 -3.6/+6.1

ttH, H➝leptons 3.9 -1.4/+1.7

ttH, H➝γγ 2.7 -1.7/+2.4

ttH tagged 2.76 -0.92/+1.05

(17)

H ➝ bb with MEM (8 TeV)

17

(18)

• Analytical matrix element method for S/B separation

‣

integrate over unreconstructed or poorly measured particles

‣

marginalize over unknown quark-jet assignments

‣

assign event weight under ttH or tt+bb (LO) hypothesis

18

ttH ➝ bb with Matrix Element Method

• Concentrate on events for which a single event interpretation is feasible

‣

1 lepton + ≥5 jets

‣

2 leptons + ≥4 jets

• Build likelihood ratio discriminant using per-jet b tagging

‣

ttH/tt+HF: 4b quarks + ≥0 light quarks

‣

tt+LF: 2b quarks + ≥2 light quarks

CMS-PAS-HIG-14-010

(19)

19

CMS-PAS-HIG-14-010

^P^s/b

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

normalized to unity

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

SL Cat-1 (H) +bb t t

H t t

MC stat.

=8 TeV s

CMS Preliminary

Ps/b 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

normalized to unity

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

DL (H) +bb t t

H t t

MC stat.

=8 TeV s

CMS Preliminary

P

s/b

=

ratio of ttH(bb)/tt+bb

probability densities SL Cat-1 DL

single-lepton single-lepton

single-lepton di-lepton

“SL Cat-1” “SL Cat-3” “SL Cat-2” “DL”

tt ➝ b  ν bqq

all quarks reconstructed

(+ gluon(s))

tt ➝ b  ν bqq

all quarks

but one W-quark reconstructed

tt ➝ b  ν bqq + g

all quarks

but one W-quark reconstructed + ≥ 1 gluon(s)

tt ➝ b  ν b  ν

all quarks reconstructed

(20)

20

• Combined fit to ME discriminant

‣

95% CL upper limits:

‣

Best-fit value μ_ttH = 0.7±1.4 Median Exp. Median Exp.

(signal injected) Obs.

2.9 3.9 3.3

• 30% lower expected limit compared to previous ttH(bb) analysis

‣

less sensitive to tt+HF modeling

-

optimizes ttH/tt+bb separation

through maximal use of kinematics and dynamics

CMS-PAS-HIG-14-010

Ps/b

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Events

0 5 10 15 20 25 30 35

40 SL Cat-1 (H)

H (125) t t

+ lf t t

c + c t t

+ b t t

b + b t tSingle top

+ W,Z t t Data

Bkg. Unc.

H (125) x 10 t

t

Pb/j

<0.15 >0.15

=8 TeV, L=19.5 fb-1

s CMS Preliminary

Data/MC

0 2

Ps/b

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Events

0 20 40 60 80

100 SL Cat-2 (H)

H (125) t t

+ lf t t

c + c t t

+ b t t

b + b t tSingle top

+ W,Z t t EWK Data

Bkg. Unc.

H (125) x 10 t

t

Pb/j

<0.20 >0.20

=8 TeV, L=19.5 fb-1

s CMS Preliminary

Data/MC

0 1 2

Ps/b

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Events

0 20 40 60 80 100 120

140 SL Cat-3 (H)

H (125) t t

+ lf t t

c + c t t

+ b t t

b + b t tSingle top

+ W,Z t t Data

Bkg. Unc.

H (125) x 10 t

t

Pb/j

<0.50 >0.50

=8 TeV, L=19.5 fb-1

s CMS Preliminary

Data/MC

0.5 1

1.5 ^s/b

P 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Events

1 10 102

DL (H) H (125) t t

+ lf t t

c + c t t

+ b t t

b + b t tSingle top

+ W,Z t t EWK Data

Bkg. Unc.

H (125) x 10 t

t

Pb/j

<0.15 >0.15

=8 TeV, L=19.5 fb-1

s CMS Preliminary

Data/MC

0 1 2

(21)

21

Summary

• CMS has reached sensitivity to SM ttH production (Δμ/μ≈1 ΔY

t

/Y

t

≈50%)

‣

thanks to combination of three decay channels

‣

μ from combined fit compatible with SM at

2.0σ

‣

largest excess driven by SS di-muon channel

• Search of tH(γγ) production compatible with SM expectation

• Analyses keep improving

‣

first ttH(bb) analysis using a Matrix Element Method at the LHC has been presented

• Long wish-list of MCs for 13 TeV

‣

need reliable (≥NLO) background and signal modeling for complicated topologies

-

plus recipes to estimate shape uncertainties

-

tt+HF provides an ideal example

• For 13 TeV, need to complement analyses with boosted tags

(22)

Back up

22

(23)

23

Couplings

H ➝ ZZ

^*

/WW

^*

/ff H ➝γγ σ(pp ➝ ttH)

≈130 fb ∝ |Y

^t

|

²

BR

γ

× (Y

t

) σ(pp ➝ tHq)

≈18 fb ∝ |Y

^t

ℳ

^a

+ ℳ

^b

|

^{2 (*)}

BR

γ

× (Y

t

)

* see e.g. Phys. Lett. B 299, 315 (1993)

(24)

24

H ➝ hadrons: analysis

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6

Events

5 10 15 20 25 30 35 40 45

= 8 TeV, L = 19.5 fb-1

s CMS Preliminary

BDT output -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6

Data/MC

0 1

Post-fit plots (S+B)

CMS-PAS-HIG-13-019

H(125) x 30 t

t

+ lf t t

c + c t t

+ b t t

b + b t

t

EWKBkg. Unc.

Data

μ/e+jets

BDTs trained for ttH/tt+jets separation

•

object & pair-wise kinematics

•

even shape

•

^b-tagging

Background: tt+jets

•

estimated from MadGraph simulation

•

data-driven corrections Large uncertainty on tt+HF

•

tt+bb, tt+b, tt+cc

•

50% a priori uncertainty on each

(25)

25

H ➝ hadrons: analysis

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

Events

20 40 60 80 100 120

= 8 TeV, L = 19.5 fb-1

s CMS Preliminary

Dilepton + ≥ Post-Fit (S+B)

BDT output

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

Data/MC

0 1

2 Fit ±1σ Fit ±2σ ^{p-value (}^χ²^{) = 0.073} ^-0.8 ^-0.6 ^-0.4 ^-0.2 ⁰ ^0.2 ^0.4 ^0.6

Events

5 10 15 20 25 30 35 40 45

= 8 TeV, L = 19.5 fb-1

s CMS Preliminary

BDT output

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6

Data/MC

0 1

-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1

Events

5 10 15 20 25

= 8 TeV, L = 19.5 fb-1

s CMS Preliminary

4 jets + 2 b-tags + ≥

τh

Lep + Post-Fit (S+B)

BDT output

-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1

Data/MC

0 1

Post-fit plots (S+B)

CMS-PAS-HIG-13-019

H(125) x 30 t

t

+ lf t

t

c + c t

t

+ b t

t

b + b t

t

EWKBkg. Unc.

Data

τ

had

τ

had

+jets μ/e+jets



^±



^∓

+jets

(26)

26

1

CMS$%H$Analysis$Comparison$to$ATLAS$!

John$Wood$–[email protected]$–$University$of$Virginia$

!  For$the$%H,$HJ>bb$analysis$in$the$lepton+jets$channel,$the$ATLAS$limits$are$be%er$than$the$

baseline$CMS$analysis:$

"  CMS$baseline$expected$limit$=$4.8,$observed$=$5.0$

"  ATLAS$expected$limit$=$3.1,$observed$=$4.2$

!  Several$diﬀerences$between$the$two$approaches,$some$large,$some$small.$$

!  Most$prominently,$ATLAS$analysis$has…$

"  Increased$signal$and$background$acceptance$due$to$object$deﬁni[ons$and$selec[ons$

"  Diﬀerent$background$composi[on$in$selected$events$due$to$diﬀerent$bJtag$

performance$

"  Incorporated$addi[onal$backgroundJrich$categories$

"  Employed$more$accurate$NLO$modeling$for$%H$signal$$

!  CMS$has$studied$the$eﬀects$which$are$immediately$available$to$incorporate:$

"  ~20%$improvement$in$unblinded$limit$when$lowering$jet/lepton$pT$thresholds$

"  ~10%$improvement$in$unblinded$limit$when$incorpora[ng$addi[onal$categories$

"  In$fullyJblinded$assessment,$these$changes$would$not$have$been$signiﬁcant$for$the$

CMS$baseline$analysis,$small$%$improvement$

"  NLO$signal$model$shows$higher$acceptance$in$most$sensi[ve$categories$

!  Overall,$no$single$aspect$of$the$analysis$diﬀerences$cause$the$diﬀerence$in$performance$

!  No$simple$explana[on$–$$a$collec[on$of$analysis$op[miza[ons$

(27)

27

2

CMS$%H$Analysis$Comparison$to$ATLAS$!

John$Wood$–[email protected]$–$University$of$Virginia$

!  Details$on$the$diﬀerences:$

"  Object$deﬁniNon/selecNon:$

o  Leptons:$$

o  ATLAS:$pT>25,$|η|$<$2.5$for$e$and$μ$

o  CMS:$pT>30,$|η|$<$2.5$(2.1)$for$e$(μ)$$

o  Jets:$$

o  ATLAS:$pT>25,$|η|$<$2.5,$cone$of$0.4$$

o  CMS:$pT$>$40,40,40,30,$|η|$<$2.4,$cone$of$0.5$

o  b]tagging:$$

o  ATLAS$has$~50%$lower$mistag$rate$at$equivalent$b]jet$eﬃciency$

"  Event$CategorizaNon$

o  ATLAS$includes$background]dominated$4jet,2tag$and$5jet,2tag$categories,$using$a$

one]dimensional$signal$discriminant$(H_T)$

"  Signal$Discriminant:$

"  ATLAS$uses$ANN,$CMS$uses$BDT$$(do$not$expect$one$to$be$superior$if$well$trained)$

"  MC$generators:$

"  %H$signal:$ATLAS$uses$NLO$HELAC+OneLoop+Powheg,$CMS$uses$LO$Pythia$

"  %+jets:$ATLAS$uses$POWHEG$for$%bar$plus$1$addiNonal$parton,$CMS$uses$

MadGraph$for$%bar$with$up$to$3$addiNonal$partons$$

"  Luminosity:$

"  ATLAS$has$~5%$more$luminosity$than$CMS$

$

(28)

28

H ➝ leptons: channels

DATASET ee/μμ/eμ

>17(8) GeV eee

>15(8,5) GeV

Tag Higgs decays to W/Z bosons or τ’s, followed by ≥1 leptonic decay

‣

full event reconstruction too demanding, but spectacular signatures:

-

use SS or multi-lepton signatures to suppress backgrounds:

CMS-PAS-HIG-13-020

Z-veto, ETmiss LD split Q>0 / Q<0 Z-veto, ETmiss LD split Q>0 / Q<0

≥1 2 SS ≥4

≥1

=3 ≥2

≥1

=4 ≥2

t

b

W⁺

ν_!

"⁺

¯t

¯b W⁻

q

¯ q H

τ⁺

τ⁻

"⁺ ν_!

¯ ν_τ

ν_τ τ_h g

g

t

b

W⁺

ν_!

"⁺

¯t

¯b W⁻

q

¯ q

H Z

Z

"⁻

"⁺

q

¯ q g

g

t

b

W⁺

ν_!

"⁺

¯t

¯b W⁻

"⁻ ν¯_! H W⁺

W⁻

ν_!

"⁺

"⁻

¯

ν_!

g

JETS (25GeV) B-TAGS e/μ

(29)

29

Statistical interpretation: CL limits

• 95% CL upper limits on a

common signal strength modifier μ=σ/σ

SM

‣

^{assuming m}^H=125.7 GeV and SM branching ratios

Median Exp. Median Exp.

(signal injected) Obs.

1.8 2.9 4.3

• Weaker limits driven by excess in μ

^±

μ

^±

channel

‣

signal-like events

‣

excess borne out by cross-check analyses

BDT output

Events

0 5 10 15 20

25 ^Data_ttH

ttW γ* ttZ/

WZ Others Fakes

channel µ±

µ±

BDT output

-0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8

Data/Sim.

0 1 2 3

(30)

SS di-muon excess

30

From C. Botta talk at Moriond14

(31)

31

(32)

32

(33)

33

(34)

34

(35)

35

MEM analysis

(36)

36

Multi-leptons