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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Clark, Philip James; Leonidopoulos, Christos; Martin, Victoria Jane; Mills, Corrinne; Collaboration, Atlas (2015)
Publisher: Springer Verlag
Languages: English
Types: Article
Subjects: scattering [p p], Supersymmetry, Higgs physics, measured [mass], Particle Physics - Experiment, ATLAS, scalar [mass], invisible decay [Higgs particle], multiple production [Higgs particle], composite [Higgs particle], decay rate [Higgs particle], 530, QC, Physical Sciences, High Energy Physics - Experiment, mass [Higgs particle], CERN LHC Coll, minimal supersymmetric standard model, heavy [Higgs particle], associated production [Higgs particle], lower limit [mass], scaling, experimental results, coupling [Higgs particle], 7000 GeV-cms8000 GeV-cms, decay modes [Higgs particle], Dark matter; Hadron-Hadron Scattering; Higgs physics; Supersymmetry; Nuclear and High Energy Physics, Hadron-Hadron Scattering, pair production [top], fusion [vector boson], Supersymmetry; Hadron-Hadron Scattering; Higgs physics; Dark matter, Fysik, singlet, Science & Technology, colliding beams [p p], decay [Higgs particle], branching ratio: upper limit [Higgs particle], 530 Physics, pseudoscalar particle [Higgs particle], Dark matter, electroweak interaction
ddc: ddc:500.2, ddc:530

Classified by OpenAIRE into

arxiv: High Energy Physics::Phenomenology, High Energy Physics::Experiment, High Energy Physics::Lattice
The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=7$ TeV and 20.3 fb$^{-1}$ at $\sqrt{s}=8$ TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the $\gamma\gamma$, $ZZ$, $WW$, $Z\gamma$, $bb$, $\tau\tau$, and $\mu\mu$ decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. Limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the $\gamma\gamma$ and $ZZ$ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of $m_{A}>370$ GeV in the ``hMSSM'' simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with $W/Z$ ($Z\to ll$, $W/Z \to jj$) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. The use of the measured visible decay rates in a more general coupling fit improves the upper limit to 0.23, constraining a Higgs portal model of dark matter. The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb$^{−1}$ of pp collision data at $ \sqrt{s}=7 $ TeV and 20.3 fb$^{−1}$ at $ \sqrt{s}=8 $ TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the γγ, ZZ, W W , Zγ, bb, τ τ , and μμ decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. Limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the γγ and ZZ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of m$_{A}$ > 370 GeV in the “hMSSM” simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with W/Z (Z → ℓℓ, W/Z → jj) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. The use of the measured visible decay rates in a more general coupling fit improves the upper limit to 0.23, constraining a Higgs portal model of dark matter. The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=7$ TeV and 20.3 fb$^{-1}$ at $\sqrt{s}=8$ TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the $\gamma\gamma$, $ZZ$, $WW$, $Z\gamma$, $bb$, $\tau\tau$, and $\mu\mu$ decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. Limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the $\gamma\gamma$ and $ZZ$ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of $m_{A}>370$ GeV in the "hMSSM" simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with $W/Z$ ($Z\to ll$, $W/Z \to jj$) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. The use of the measured visible decay rates in a more general coupling fit improves the upper limit to 0.23, constraining a Higgs portal model of dark matter.
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    • [78] M. Grees, R.M. Godbole and P.Roy, Theory and Phenomenology of Sparticles: An Account [81] A. Djouadi, L. Maiani, A. Polosa, J. Quevillon and V. Riquer, Fully covering the MSSM [83] A. Djouadi, L. Maiani, G. Moreau, A. Polosa, J. Quevillon and V. Riquer, The post-Higgs MSSM scenario: Habemus MSSM?, Eur. Phys. J. C 73 (2013) 2650 [arXiv:1307.5205] [94] R.V. Harlander and W.B. Kilgore, Next-to-next-to-leading order Higgs production at hadron colliders, Phys. Rev. Lett. 88 (2002) 201801 [hep-ph/0201206] [INSPIRE]. [95] C. Anastasiou and K. Melnikov, Higgs boson production at hadron colliders in NNLO QCD, Nucl. Phys. B 646 (2002) 220 [hep-ph/0207004] [INSPIRE]. [96] V. Ravindran, J. Smith and W.L. van Neerven, NNLO corrections to the total cross-section for Higgs boson production in hadron hadron collisions, Nucl. Phys. B 665 (2003) 325 [97] U. Aglietti, R. Bonciani, G. Degrassi and A. Vicini, Two loop light fermion contribution to [104] R.E. Shrock and M. Suzuki, Invisible decays of Higgs bosons, Phys. Lett. B 110 (1982) 250. [105] D. Choudhury and D.P. Roy, Signatures of an invisibly decaying Higgs particle at LHC, detector, Phys. Rev. Lett. 112 (2014) 041802 [arXiv:1309.4017] [INSPIRE].
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