CMS Diboson Results - IJCLab Events Directory (Indico) · CMS Diboson Results, HH 2015 David...
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CMS Diboson Results
Higgs Hunting 201530 July 2015
David SperkaUniversity of Florida
On Behalf of the CMS Collaboration
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 2
Higgs at the LHC● The CMS experiment has entered the precision measurement
era for the properties of the 125 GeV Higgs Boson● Diboson processes continue to play a key role:
→ Large branching fraction in case of WW→ Excellent mass resolution in case of ZZ→4ℓ, γγ
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 3
H→WW: Overview● Large Branching Fraction
→ 0.215 @ mH=125.0 GeV● Not fully reconstructible due to neutrinos
→ Use observables mℓℓ , Δφℓℓ , and mT ● Main backgrounds: WW, W+jets and top● 5 exclusive event categories targeting all
production modes
Broad excess observed compatible with the expected mass resolution:
JHEP01 (2014) 096
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 4
H→γγ: Overview● Small Branching Fraction
→ 2.28 x 10-3 @ mH=125.0 GeV● Fully reconstructible decay with excellent mass resolution (1-2%)● Large continuum background from QCD γγ and γ+jet
→ Photon ID BDT used to reject jet fakes● Many event categories targeting all production modes
Eur. Phys. J. C (2014) 74:3076
More details in talk by Benoit Courbon: "Observation and properties of a Higgs Boson in the Two-Photon Decay Channel with CMS"
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 5
H→ZZ→4ℓ: Overview● Tiny Branching Fraction to 4ℓ (ℓ=e,μ)
→ 1.25 x 10-4 @ mH=125.0 GeV● Fully reconstructible decay
→ Excellent mass resolution (~1-3%)● Very small background from irreducible ZZ and
reducible Z+X● Background further reduced using matrix element
likelihood discriminant
● 3D likelihood in 0/1 jet [pT(4ℓ)] and dijet [Djet=linear discriminant using m(jj) and |Δη(jj)|] categories
PHYS. REV. D 89, 092007 (2014)
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 6
H→γγ and H→ZZ: Signal Strength Compatible with SM Higgs (~23-30% uncertainty on total signal strength)
H→γγ: H→ZZ:
See talk by Ben Kreis for CMS Combination for couplings, spin/parity
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 7
H→γγ and H→ZZ Mass Combination
Mass Measured with ~0.25% uncertainty
See talk by Tongguang Cheng for ATLAS+CMS mass combination
Eur. Phys. J. C (2015) 75:212
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 8
H→ZZ→4ℓ: Updated Width Analysis● Width from off-shell production in 4ℓ channel updated with several improvements:
→ Dijet discriminant updated to use matrix element approach → Jet categories added to off-shell region (in addition to on shell region)
● Allows for presence of a mass-dependent anomalous coupling ΛQ
→ Previously untested, can only be probed in the off-shell region→ Interpretation in models with an anomalous coupling
Off-shell 0/1 jet category See talk by Ben Kreis for constraints on ΛQ
NEW!
HIG-14-036Submitted to arxiv and
Phys. Rev. D
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 9
H→ZZ→4ℓ: Lower Bound on ΓH● Obtained by setting an upper bound on the Higgs Boson lifetime
→ (well beyond experimental sensitivity)→ Selection updated to be unbiased w.r.t. lifetime→ pT-spectrum dependence of vertex resolution taken into account
NEW!
HIG-14-036Submitted to arxiv and
Phys. Rev. D
First ever constraint on the Higgs boson lifetime!
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 10
H→γγ: Fiducial Cross Section● Measured in fiducial phase space closely
matching experimental acceptance ● Event categorization method updated:→ Uses mass resolution estimator fully decorrelated from the mass → Improves sensitivity by 10% while maintaining a smooth background shape
● Background subtraction and unfolding to particle level done simultaneously by minimizing a function which includes usual likelihood and detector response→ Correlation of nuisance parameters→ determined from simulation
NEW!HIG-14-016
To be submitted to arxiv and EPJC
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 11
H→γγ: Differential Cross Section● Differential cross sections measured for
several observables:
NEW!
→ pTH: sensitive to production mode, new physics in ggH loop
→ |yH|: sensitive to production mode, parton distribution functions
HIG-14-016To be submitted to
arxiv and EPJC
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 12
H→γγ: Differential Cross Section● Jet related observables also studied● Sensitive to production modes, modeling of
hard quark/gluon radiation, BSM physics effects
N(jets) pT(jet) m(jj)
NEW!HIG-14-016
To be submitted to arxiv and EPJC
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 13
H→4ℓ: Fiducial Cross Section● Measurement done at 7 and 8 TeV● Model Dependence estimated from wide
range of SM and exotic Higgs models→ Full Model dependence ~7% for the inclusive cross section→ <1% using experimental constraints→ Z→4ℓ resonance used as validation → Several ratios also measured
HIG-14-028NEW!
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 14
H→4ℓ: Differential Cross Section● Several differential observables also studied with H→4ℓ
→ Similar measurement strategy as H→γγ→ In agreement with SM predictions→ Still small model dependence
pTH |yH|
NEW!
HIG-14-028
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 15
H→4ℓ: Differential Cross Section● Jet related observables also studied in H→4ℓ:
→ N(jets), pT(jet)● More jets but softer pT(jet) than SM predictions
→ p=0.13 for N(jets) distribution
N(jets) pT(jet)
NEW!
HIG-14-028
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 16
Conclusions● Diboson processes extensively used to study properties of
the 125 GeV Higgs Boson
● More recent CMS diboson results in other talks:
● Looking forward to Higgs physics at 13 TeV!
→ Combined CMS results (couplings, spin/parity): Ben Kreis → ATLAS+CMS Combination (mass): Tongguang Cheng
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 17
Additional Material
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 18
Original Width AnalysisPhys. Lett. B 736 (2014) 64
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 19
Updated Width ResultsHIG-14-036
Submitted to arxiv and Phys. Rev. D
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H→γγ: Differential Cross SectionsHIG-14-016
To be submitted to arxiv and EPJC
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 21
H→γγ: Differential Cross SectionsHIG-14-016
To be submitted to arxiv and EPJC
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 22
H→γγ: Photon ID EfficienciesHIG-14-016
To be submitted to arxiv and EPJC
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 23
H→4ℓ: Inclusive Cross SectionsHIG-14-028
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 24
H→4ℓ: Cross Section InputsHIG-14-028
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 25
Photon Vertex EfficiencyEur. Phys. J. C (2014) 74:3076
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 26
Photon ID ValidationEur. Phys. J. C (2014) 74:3076
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 27
Photon Energy Scale/ResolutionEur. Phys. J. C (2014) 74:3076
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 28
H → 4ℓ: Kinematics
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 29
H→WW: Mass and CouplingsJHEP01 (2014) 096
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 30
H→Zγ Phys. Lett. B 726 (2013) 587
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 31
H→γ*γ→μ+μ-γ arxiv:1507.03031
σ/σSM
< 7.7 (95% CL)B(H→J/ψ γ) < 1.5 x 10-3 (95% CL)
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 32
tHq, H→γγHIG-14-001
σ/σCt=-1
< 4.1 (95% CL)
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CMS Diboson Results, HH 2015 David Sperka, on behalf of the CMS Collaboration 33
tHq, H→WWHIG-14-026
σ/σCt=-1
< 6.7 (95% CL)