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Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama /18
Characterizing a Higgs-like resonanceat the LHC
Kentarou Mawatari(Vrije Universiteit Brussel and International Solvay Institutes)
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K.Hagiwara, Q.Li, KM, JHEP07(2009)101 [arXiv:0905.4314]C.Englert, D.Goncalves-Netto, KM, T.Plehn, JHEP01(2013)148 [arXiv:1212.0843]P. de Aquino, F.Maltoni, KM, M.Zaro et al, on-going project
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
• Since October 2010, to make a chain between the theoretical and experimental groups at the VUB.
• Contact to
‣ http://we.vub.ac.be/dntk/GOA.html
‣ [email protected], [email protected]
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pheno
Englert, Frere,Hambye, Tinyakov, Tytgat, Argurio, ...
Phenomenology groupat the Vrije Universiteit Brussel
Maltoni, ...
CMS, ICE3,H1, OPERA, ...
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
• Since October 2010, to make a chain between the theoretical and experimental groups at the VUB.
• Contact to
‣ http://we.vub.ac.be/dntk/GOA.html
‣ [email protected], [email protected]
2
pheno
Englert, Frere,Hambye, Tinyakov, Tytgat, Argurio, ...
Phenomenology groupat the Vrije Universiteit Brussel
Maltoni, ...
CMS, ICE3,H1, OPERA, ...
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
Is it the Brout-Englert-Higgs boson?
• Spin-0, 1, or 2?
• Parity-even, odd, or mixed?
‣ different XVV and Xff tensor structures
• Only after the operator/Lagrangian basis is fixed, we can determine the corresponding coupling strength.
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
How can we get the spin/parity information?
• mass and angular distributions in X→ZZ→4l.
• di-jet distributions in pp→Xjj, vector-boson-fusion (VBF).
• X→γγ
• X→ττ
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
X→VV decay
The off-shell Z mass and the azimuthal correlations between the Z decay planes reflect the XVV tensor structures.
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Choi, Miller, Muhlleitner, Zerwas (2003)
L0+SM
= g0+SM
VµV µX0
L0−D5= g0−D5
Vµν�V µνX0
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
Xjj production -- vector boson fusion
The azimuthal correlations between the forward tagging jets reflect the XVV tensor structures.
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Plehn, Rainwater, Zeppenfeld (2002)
L0+SM
= g0+SM
VµV µX0
L0+D5
= g0+D5
VµνV µνX0
L0−D5= g0−D5
Vµν�V µνX0
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
X→VV decay vs. VBF production
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Nontrivial azimuthal correlations can be explained as the quantum interference among different helicity states of the intermediate vector-bosons.
dσ/d∆φ ∼ const. for 0+SM, dσ/d∆φ ∼ 1±A cos 2∆φ for 0±D5
Hagiwara, Li, KM (2009)
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
X→VV decay at mX=126GeV
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Bolognese et al. (2012): JHU-Generator
spin-0 spin-1 spin-2mass distributions
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
X→VV decay at mX=126GeV
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spin
-0
s
pin-
1
sp
in-2
angular distributions Bolognese et al. (2012): JHU-Generator
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
VBF production at mX=126GeV
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spin
-0
s
pin-
1
sp
in-2
Englert, Goncalves-Netto, KM, Plehn (2013)X/jet distributions
√s = 14 TeV
pTj > 20 GeV∆Rjj > 0.6|ηj | < 5
mjj > 600 GeV
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
VBF production at mX=126GeV
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spin-0 spin-1 spin-2
Englert, Goncalves-Netto, KM, Plehn (2013)di-jet correlations
Δη as well as ΔΦ are the powerful observables.
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
Obs-by-obs based strategy in VBF
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Englert, Goncalves-Netto, KM, Plehn (2013)
The di-jet correlations are the most decisive, in particular to separate the different scalar coupling structures.
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
X(JP) characterizationwith FeynRules
• Effective Lagrangians have been implemented via FeynRules by including all minimal (even higher) dimension operators for J=0,1,2. e.g. the X-Z-Z interactions:
- κi : dimensionless coupling parameters
- cosα : mixing between 0+ and 0- parameters
- Λ : theory cutoff scale
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Artoisenet, de Aquino, Frederix, Maltoni, Mandal, Mathews, KM, Ravindran, Seth, Torrielli, Zaro (on-going)
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
X(JP) characterizationwith MadGraph5
• In MadGraph5:
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Artoisenet, de Aquino, Frederix, Maltoni, Mandal, Mathews, KM, Ravindran, Seth, Torrielli, Zaro (on-going)
./bin/mg5>import model XCharac>generate p p > x0, x0 > mu- mu+ e- e+>output>launch
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
X(JP) characterizationwith MadGraph5
• In MadGraph5:
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Artoisenet, de Aquino, Frederix, Maltoni, Mandal, Mathews, KM, Ravindran, Seth, Torrielli, Zaro (on-going)
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
X(JP) characterizationwith ME-PS merging and MadWeight
• It allows us to generate any tree-level process of interest, including all spin correlations, possible interference with backgrounds and to build inclusive samples via MatrixElement-PartonShower merging.
• With MadWeight, one can automatically build likelihoods via the Matrix-Element-Method.
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Artoisenet, de Aquino, Frederix, Maltoni, Mandal, Mathews, KM, Ravindran, Seth, Torrielli, Zaro (on-going)
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
X(JP) characterizationwith aMC@NLO
• Furthermore, X(JP) events can be generated at the next-to-leading order (NLO) with aMC@NLO.
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Artoisenet, de Aquino, Frederix, Maltoni, Mandal, Mathews, KM, Ravindran, Seth, Torrielli, Zaro (on-going)
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/18Kentarou Mawatari (VUB) Feb.13, 2013 HPNP2013 @ Toyama
Outlook
• After the discovery of a Higgs-like resonance at the LHC, the main focus of the analyses will be the determination of the Higgs Lagrangian.
• This includes
- the structure of the operators, linked to the spin/parity of the ‘Higgs’ boson.
- an independent measurement of the coupling strength.
• We presented a comprehensive study in VBF, as comparing with the X→ZZ decay, and showed that the di-jet correlations are the most distinctive observables.
• The various MC tools are ready for the X characterization study.
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