Exotic Higgs Decays at CMS
Aysen Tatarinov for CMS Collaboration
Texas A&M University
Dark Interactions 2014Brookhaven National Laboratory
June 11–13, 2014
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 1 / 34
Introduction (1/2)
I Higgs-like particle with mass ∼125 GeV was observed at LHC
I Critical question: is it the SM Higgs boson?
I (1) Precise measurementsof its branching ratios:
I This may take many yearsI Current 95% CL limit:BBSM ≤ 0.52
I (2) Direct searches for non-SMdecays of SM-like Higgs:
I In case of observation: this isnon-SM Higgs!
I In case of no signal: restrictbroad class of scenariosbeyond the SM
BSMBR0 0.2 0.4 0.6 0.8 1
ln L
∆-
2
0.0
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2.0
2.5
3.0
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4.0
4.5
5.0Observed
Exp. for SM H
CMS Preliminary -1 19.6 fb≤ = 8 TeV, L s -1 5.1 fb≤ = 7 TeV, L s
BSM, BRgκ, γκ
CMS-PAS-HIG-13-005
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 2 / 34
Introduction (2/2)
I Searches for invisible decays of the Higgs boson:I Vector Boson Fusion productionI ZH production with the Z boson decaying to a pair of charged leptonsI ZH production with the Z boson decaying to bottom quarksI Interpretation in terms of Higgs-portal models of DM interactions
I Search for non-SM Higgs decays to a pair of new light bosons, eachof which decays to boosted muon pairs: h→ 2a→ 4µ
I Interpretation in the context of SUSY with hidden dark sector
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 3 / 34
Invisible Higgs Decays in Vector Boson Fusion Channel
I Experimental signature:I Two jets with high transverse momentum, pT , well separated in
pseudorapidityI Large missing transverse evergy, Emiss
T
I CMS-PAS-HIG-13-013, arXiv:1404.1344v2
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 4 / 34
Vector Boson Fusion Channel: Results (1/2)
I EmissT and Mjj in data and simulation after the full selection:
I Signal contribution for mH = 125 GeV and B(H → inv) = 100%I Background estimates and signal predictions shown cumulatively
[GeV]missTE
150 200 250 300 350 400 450 500
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nts
/ 20
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-1 = 8 TeV, L = 19.5 fbs
VBF H(inv)
Observed
inv) = 100%→B(H = 125 GeV,HVBF m
V+jets
, tW, DY(ll)+jets, VVtt
[GeV]jjM1500 2000 2500 3000 3500
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/ 100
GeV
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-1 = 8 TeV, L = 19.5 fbs
VBF H(inv)
Observed
inv) = 100%→B(H = 125 GeV,HVBF m
V+jets
, tW, DY(ll)+jets, VVtt
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 5 / 34
Vector Boson Fusion Channel: Results (2/2)
I No significant excess in data over total background
I Set upper limit on invisible Higgs decays in VBF channel
I Assuming SM VBF production cross section, 95% CL observed(expected) upper limit on B(h→ inv) for mH = 125 GeV is 0.65 (0.49)
[GeV]Hm100 150 200 250 300 350 400
inv)
[pb]
→ x
B(H
σ
0
0.5
1
1.5
2
2.5 invisible→CMS VBF H
-1 = 8 TeV, L = 19.5 fbs95% CL limits
Observed limitExpected limit
)σExpected limit (1)σExpected limit (2
(SM)VBFσ
[GeV]Hm100 150 200 250 300 350 400
(SM
)V
BF
σ in
v)/
→ x
B(H
σ
0.5
1
1.5
2
2.5 invisible→CMS VBF H
-1 = 8 TeV, L = 19.5 fbs95% CL limits
Observed limitExpected limit
)σExpected limit (1
)σExpected limit (2
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 6 / 34
Search for Invisible Higgs Decays in Z(ll)H Channel
I Experimental signature:
I Two leptons (e+e− or µ+µ−) with invariant mass consistent with Zmass
I Large missing transverse evergy, EmissT
I CMS-PAS-HIG-13-018, arXiv:1404.1344v2
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 7 / 34
Results (1/2)I mT and ∆φ(ll) in data and simulation after the full selection:
I Signal contribution for mH = 125 GeV and B(H → inv) = 100%I Background estimates shown cumulativelyI Signal predictions shown separatelyI For limit setting at 7 TeV 1D distribution of mT is usedI For limit setting at 8 TeV 2D distribution of mT and ∆φ(ll) is usedI Limit on invisible Higgs decays in Z(ll)H channel to be shown later in
combination with limit Z(bb̄)H channel
[GeV]Tm200 300 400 500 600 700 800 900 1000
Eve
nts
0
2
4
6
8
10
12
14
16
18 CMS
-1 = 7 TeV, L = 4.9 fbs
Z(ll) H(inv)
Observed
inv)=100%→B(H
=125GeV),H
ZH(m
ZZ
WZ
DY(ll)+jets
,tW,WW,W+jetstt
[GeV]Tm200 300 400 500 600 700 800 900 1000
Eve
nts
0
10
20
30
40
50
60CMS
-1 = 8 TeV, L = 19.7 fbs
Z(ll) H(inv)
Observed
inv)=100%→B(H
=125GeV),H
ZH(m
ZZ
WZ
DY(ll)+jets
,tW,WW,W+jetstt
(l,l) [radians]φ∆0 0.5 1 1.5 2 2.5 3
Eve
nts
0
20
40
60
80
100CMS
-1 = 8 TeV, L = 19.7 fbs
Z(ll) H(inv)
Observed
inv)=100%→B(H
=125GeV),H
ZH(m
ZZ
WZ
DY(ll)+jets
,tW,WW,W+jetstt
7 TeV 8 TeV 8 TeVAysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 8 / 34
Search for Invisible Higgs Decays in Z(bb̄)H Channel
I Experimental signature:
I Two jets consistent with Z → bb̄I Large missing transverse evergy, Emiss
T
I CMS-PAS-HIG-13-028, arXiv:1404.1344v2
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 9 / 34
Z(bb̄)H Channel: Results (1/2)I Multivariate Analysis: Boosted Decision Trees (BDT)I BDT output in high-, intermediate-, low- dijet pT regions in data and
simulations after the full selectionI Signal contribution for mH = 125 GeV and B(H → inv) = 100%I Background estimates shown cumulativelyI Signal predictions shown separately
Eve
nts
/ 0.1
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1
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510CMS
-1 = 8 TeV, L = 18.9 fbs
T) H(inv) high pbZ(b
Observed
inv)=100%→B(H =125GeV,
HZH m
Z+jets
W+jets
, tWtt
QCD
VV
)bVH(b
BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
MC
Dat
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510 CMS-1 = 8 TeV, L = 18.9 fbs
T) H(inv) intermediate pbZ(b
Observed
inv)=100%→B(H =125GeV,
HZH m
Z+jets
W+jets
, tWtt
QCD
VV
)bVH(b
BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
MC
Dat
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510CMS
-1 = 8 TeV, L = 18.9 fbs
T) H(inv) low pbZ(b
Observed
inv)=100%→B(H =125GeV,
HZH m
Z+jets
W+jets
, tWtt
QCD
VV
)bVH(b
BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1
MC
Dat
a0
1
2
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 10 / 34
ZH Channel: Results (2/2)
I Combine limits on invisible Higgs decays in Z(bb̄)H channel and Z(ll)Hchannel
I Assuming SM ZH production cross section, 95% CL observed(expected) upper limit on B(h→ inv) for mH = 125 GeV is 0.81 (0.83)
[GeV]Hm105 110 115 120 125 130 135 140 145
inv)
[pb]
→ x
B(H
σ
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8CMS
)HbCombination of Z(b invisible→and Z(ll)H, H
= 8 TeV (Both ZH channels)s-1L = 18.9-19.7 fb
= 7 TeV (Z(ll)H only)s-1L = 4.9 fb
95% CL limitsObserved limitExpected limit
)σExpected limit (1)σExpected limit (2
(SM)ZHσ
[GeV]Hm105 110 115 120 125 130 135 140 145
(SM
)Z
Hσ
inv)
/→
x B
(Hσ
0.5
1
1.5
2
2.5
3CMS
)HbCombination of Z(b invisible→and Z(ll)H, H
= 8 TeV (Both ZH channels)s-1L = 18.9-19.7 fb
= 7 TeV (Z(ll)H only)s-1L = 4.9 fb
95% CL limits
Observed limitExpected limit
)σExpected limit (1
)σExpected limit (2
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 11 / 34
Combination of VBF, Z(ll)H, Z(bb̄)H channelsI Combine limits on invisible Higgs decays of all three searches
I Assuming SM ZH production cross section, 95% CL observed(expected) upper limit on B(h→ inv) for mH = 125 GeV is 0.58 (0.44)
I The best direct measurement of B(h→ inv) to date
[GeV]Hm115 120 125 130 135 140 145
SM
σ in
v)/
→ x
B(H
σ
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2CMS
Combination of VBF and invisible→ZH, H
= 8 TeV (VBF + ZH)s-1L = 18.9-19.7 fb
= 7 TeV (Z(ll)H only)s-1L = 4.9 fb
95% CL limits
Observed limitExpected limit
)σExpected limit (1
)σExpected limit (2
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 12 / 34
Interpretation (1/2)
I Interpret the limit on B(h→ inv), assuming SM production cross section, inthe context of a Higgs-portal model of dark matter interactions
I If Mχ < mH/2, the width of invisible Higgs decays, Γinv relates tospin-independent DM-nucleon elastic cross section as follows for scalar(S),vector (V), fermionic (F) DM:
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 13 / 34
Interpretation (2/2)
I Upper limits on the DM-nucleon cross section for mH = 125 GeV andB(h→ inv) < 0.51 at 90%CL as a function of the DM mass
I Severeley restrict the DM-nucleon cross section for light DM
[GeV]χMDM Mass 10 210 310
[pb]
SI -N
χσ
DM
-nuc
leon
cro
ss s
ectio
n
-1310
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σCRESST 1σCRESST 2
XENON100(2012)XENON10(2011)DAMA/LIBRACoGeNT(2013)/90%CLCoGeNT(2013)/99%CLCDMS(2013)/95%CLCOUPP(2012)LUX(90%CL)
CMS invisible→ZH, H Combination of VBF and
= 125 GeVHm inv) < 0.51 @ 90% CL→B(H
(VBF+ZH)-1 = 8.0 TeV, L = 18.9-19.7 fbs (ZH)-1 = 7.0 TeV, L = 4.9 fbs
vector
scalar
fermion
Min
Lattice
Max
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 14 / 34
Search for muon (leptin) jets
I Search for non-SM Higgs decays to a pair of new light bosons, eachof which decays to boosted and isolated muon pairs (dimuons):
h→ 2a→ 4µ (CMS-PAS-HIG-13-010)I ma within the range 0.25–3.55 GeV (roughly between 2mµ and 2mτ )
p
p
ha
a
µµ
µµ
+
_+
_
I Analysis is designed to remain model independentI Allows easy reinterpretation in the context of any scenario
with the same signature
I Example interpretation: SUSY + hidden sector
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 15 / 34
SUSY + hidden sector
I Recent observation of rising positron fraction at high energies by satellite experiments
I Dark matter annihilation: new light γD as an attractive long-distance force between slowmoving WIMPs
I Simplified implementation of dark sector (for simulation only):I dark neutralino nD (new LSP) + dark photon γD
I if mn1 <mh2
: h → 2n1
I n1 decays into dark sector particles: n1 → nDγDI γD weakly couples to SM via kinetic mixing with photon
p
p
hγ
γ
µµ
µµ D
D
+
_+
_
nD
nD
n1
n1
p
p
hγ
γ
µµ
µµ D
D
+
_+
_
nD
nD
n1
n1
Phys. Rev. Lett. 110, 141102 (2013)
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 16 / 34
Analysis Selection
p
p
ha
a
µµ
µµ
+
_+
_
I At least four muons: pT > 8 GeV/c, |η| < 2.4, good track quality
I At least one good quality muon with pT > 17 GeV/c, |η| < 0.9
I Assign two opposite-sign muons to a dimuon
I mµµ < 5 GeV/c2 and (good common vertex or ∆Rµµ < 0.01)
I Further consider events with exactly two dimuons
I Apply isolation requirement to dimuons: supresses backgroundby a factor of 50, reject about 20% of signal
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 17 / 34
Signal Region
I Target events where dimuons are produced in decaysof new light bosons with the same mass
I Signal region: reconstructed dimuon masses consistent with each other:I |m1 −m2| ≤ 5 · σ(m1+m2
2 ) (where σ(m) — dimuon mass resolution)
I Study of dimuon mass resolution: σ(m) ∼ 0.026 + 0.013 ·mI Use narrow SM resonances in data: ω, φ, J/ψ, ψ′
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 18 / 34
SM Background (1/2): bb̄
I 2D background template obtained from bb̄ enriched data: events with onedimuon and one muon (no isolation requirement)
I Off-diagonal part of bb̄ 2D shape is normalized to 8 events observed inoff-diagonal region in data
I 1.8± 0.6 of bb̄ events expected in the signal region
)2 c x
0.0
25 G
eV/
2 cE
vent
s / (
0.02
5 G
eV/
-510
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)2 c x
0.0
25 G
eV/
2 cE
vent
s / (
0.02
5 G
eV/
-510
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0.5 1 1.5 2 2.5 3 3.5
0.5
1
1.5
2
2.5
3
3.5
]2c [GeV/1
µµm0.5 1 1.5 2 2.5 3 3.5
]2 c [G
eV/
2µµm
0.5
1
1.5
2
2.5
3
3.5
-1 = 20.65 fbint = 8 TeV LsCMS Prelim. 2012
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 19 / 34
Background Estimation (2/2): Prompt Double J/ψ
I Prompt double J/ψ productionI 2D Crystal Ball template normalized to dataI 2.0± 2.0 prompt double J/ψ events expected in the signal region
)2 c x
0.0
25 G
eV/
2 cE
vent
s / (
0.02
5 G
eV/
-310
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)2 c x
0.0
25 G
eV/
2 cE
vent
s / (
0.02
5 G
eV/
-310
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]2c [GeV/1
µµm0.5 1 1.5 2 2.5 3 3.5
]2 c [G
eV/
2µµm
0.5
1
1.5
2
2.5
3
3.5
0.5 1 1.5 2 2.5 3 3.5
0.5
1
1.5
2
2.5
3
3.5
-1 = 20.65 fbint = 8 TeV LsCMS Prelim. 2012
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 20 / 34
Signal Region Yields
I Unblind the signal region(diagonal region)
I One event is observed in thesignal region
I 3.8± 2.1 background eventsexpected in the signal region(1.8 ± 0.6 bb̄,2.0 ± 2.0 double J/ψ)
)2 c x
0.0
25 G
eV/
2 cE
vent
s / (
0.02
5 G
eV/
-510
-410
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)2 c x
0.0
25 G
eV/
2 cE
vent
s / (
0.02
5 G
eV/
-510
-410
-310
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-110
]2c [GeV/1
µµm0.5 1 1.5 2 2.5 3 3.5
]2 c [G
eV/
2µµm
0.5
1
1.5
2
2.5
3
3.5
]2c [GeV/1
µµm0.5 1 1.5 2 2.5 3 3.5
]2 c [G
eV/
2µµm
0.5
1
1.5
2
2.5
3
3.5
-1 = 20.65 fbint = 8 TeV LsCMS Prelim. 2012
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 21 / 34
Model Independent Limit
95% CL limit on σ(pp → h→ 2a)× B2(a→ 2µ)× αgen
I αgen — kinematic andgeometric acceptance ongenerator level
I We use flat εfullαgen
= 0.63 ±0.05observed in all MC samples weused
I Applicable to models with 4µcoming from new light bosonswith mass in range 0.25–3.55GeV, where new light bosonstypically isolated and spatiallyseparated
]2c [GeV/1am
0 0.5 1 1.5 2 2.5 3 3.5 4
[fb]
gen
α) µ
2
→(a
2
2a)
B→
(pp
σ 0
0.1
0.2
0.3
0.4
0.5
Model independent 95% CL upper limit
-1 = 20.65 fbint = 8 TeV LsCMS Prelim. 2012
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 22 / 34
Results: SUSY with Hidden Dark Sector Scenario
I 95% CL limit on σ(pp → h→ 2a)B2(a→ 2µ) vs mh
]2c [GeV/hm90 100 110 120 130 140 150
) [fb
]µ
2
→ Dγ(2
) B
D+
2nDγ
2→
h
→(p
p σ
0
1
2
3
4
5
6
7
8
9
10Dark SUSY 95% CL Limit:
2c = 1 GeV/Dn
, m2c = 10 GeV/1nm
2c = 0.4 GeV/D
γand m
),h
(mSM
σ h)=→(pp σPrediction with
) = 0.25%,1 2n→B(h
) = 50%,D+ nD
γ → 1
B(n
) = 45%µ 2→ D
γand B(
-1 = 20.65 fbint = 8 TeV LsCMS Prelim. 2012
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 23 / 34
Conclusions
Searches for invisible Higgs decays in VFB and ZH channels with 7 and 8 TeVdata collected at CMS experiment
I The best direct measurement of B(h→ inv) to date
I Severe restriction on DM-nucleon cross section for low mass DM(Mχ < mH/2) in the context of Higgs-portal model of dark matterinteractions
Search for non-SM Higgs decays to a pair of new light bosons, which decay toboosted and isolated muon pairs: h→ 2a→ 4µ (2mµ . ma . 2mτ )
I Model independent limit is set:
I Can be applied to any model with the same signatureI Interpreted in the context of SUSY with hidden dark sector
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 24 / 34
BACKUP SLIDES
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 25 / 34
Search for Invisible Higgs Decays in VBF Channel
Event selection:
I Two jets with pj1T , pj2T > 50 GeV
I Forward/backward: ηj1 · ηj2 < 0
I Well separated in pseudorapidity: ∆ηjj > 4.2
I High invariant mass: Mjj > 1100 GeV
I Missing transverse energy: EmissT > 130 GeV
I Veto events with e, µ with pT > 10 GeV —supress Z and W backgrounds
I ∆φjj < 1.0 — supress multijet backgrounds
I Central jet veto (CJV): veto events withadditional jet with pT > 30 GeV andηj1 < η < ηj2
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 26 / 34
VBF Channel: Background Estimation
I Main backgrounds: Z(νν)+jets and W(lν)+jets (not identified lepton)
I Data-driven estimation with Z and W decays to well identified leptons
I Z(νν)+jets control region: require oppositely charged pair of muons,veto additional leptons, relax some selections
I Number of Z(νν) events in the signal region:
I Ncµµobs — observed yield in the control region
I Ncbkg — background estimation from tt̄, single-top, diboson MC
I W(eν)+jets and W(µν)+jets control region: require electron or muon,veto additional leptons
I W(τν)+jets control region: require hadronic tau, veto additionalleptons, do not apply CJV
I QCD multijet backgrounds — data-driven (ABCD method)
I Minor backgrounds (tt̄, signle-top, diboson, DY(ll)) — MC simulation
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 27 / 34
Vector Boson Fusion Channel: Results
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 28 / 34
Search for Invisible Higgs Decays in Z(ll)H ChannelEvent selection:
I e+e− or µ+µ−, each lepton with pT > 20 GeV,invariant mass mll within ±15 GeV from Zboson mass
I Reject events with two or more jets withpT > 30 GeV — reduce DY(ll)+jetsbackground
I Veto events with additional e, µ with pT > 10GeV — supress Z and W backgrounds
I Reject events identified to have b quark —supress top-quark background
I Final requirements optimized for best expectedexclusion limit for mH = 125 GeV:
I EmissT > 130 GeV, ∆φ(ll ,Emiss
T ) > 2.7,|Emiss
T − pllT |/pllT < 0.25
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 29 / 34
Z(ll)H Channel: Background estimation
I Main backgrounds: WZ and ZZ — estimate using MC simulation
I DY(ll)+jets — use orthogonal control sample of γ+jets eventsI Minor backgrounds — tt̄, Wt, WW, W+jets
I Control sample with opposite-charge different-flavor dileptons (e±µ∓)I Multiply number of events in the control region, Neµ, by scale factorsαee and αµµ to estimate backgrounds in e+e− and µ+µ− final states
I Measure αee and αµµ in the sidebands (SB) of the Z peak(40 < mll < 70 GeV and 110 < mll < 200 GeV):
I NSBee , NSB
µµ , NSBeµ — number of events in e+e−, µ+µ−, e±µ∓ final
states in top-quark enriched sample
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 30 / 34
Z(ll)H Channel: Results
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 31 / 34
Search for Invisible Higgs Decays in Z(bb)H Channel
I Events with two jets consistent with Z → bb̄,large Emiss
T due to invisible Higgs decay
I Summary of selection criteria:
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 32 / 34
Z(bb)H Channel: Background Estimation & BDT Training
I All backgrounds are estimated from MC simulation
I Train BDT using simulated samples for signal and backgrounds after allselections
I Set of BDT input variables is the subset of the following variables chosen initerative optimization:
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 33 / 34
Z(bb̄)H Channel: Results
Aysen Tatarinov (Texas A&M University) Exotic Higgs Decays at CMS Dark 2014 34 / 34
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