Higgs characterisation via vector-boson fusion and associated production: NLO and parton-shower effects

Maltoni, Fabio; Mawatari, Kentarou; Zaro, Marco

doi:10.1140/epjc/s10052-013-2710-5

Cited by 66 publications

(77 citation statements)

References 154 publications

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“…The coefficientsc W ,c HW ,c HB andc 3W affect TGCs, withc 3W being limited only by TGC measurements, since it does not affect Higgs physics. Note that our parametrization in terms of dimension-six effective operators are related to the anomalous coupling characterization [120][121][122], and the translation in written in the tables in ref. [118].…”

Section: Tgc Constraints On Dimension-6 Operator Coefficientsmentioning

confidence: 99%

The effective Standard Model after LHC Run I

Ellis

Sanz

You

2015

J. High Energ. Phys.

161

176

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Abstract:We treat the Standard Model as the low-energy limit of an effective field theory that incorporates higher-dimensional operators to capture the effects of decoupled new physics. We consider the constraints imposed on the coefficients of dimension-6 operators by electroweak precision tests (EWPTs), applying a framework for the effects of dimension-6 operators on electroweak precision tests that is more general than the standard S, T formalism, and use measurements of Higgs couplings and the kinematics of associated Higgs production at the Tevatron and LHC, as well as triple-gauge couplings at the LHC. We highlight the complementarity between EWPTs, Tevatron and LHC measurements in obtaining model-independent limits on the effective Standard Model after LHC Run 1. We illustrate the combined constraints with the example of the two-Higgs doublet model.

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Section: Tgc Constraints On Dimension-6 Operator Coefficientsmentioning

confidence: 99%

The effective Standard Model after LHC Run I

Ellis

Sanz

You

2015

J. High Energ. Phys.

161

176

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show abstract

“…Many of the searches and variables proposed to constrain the CP properties of the Higgs rely on its couplings to massive vector bosons. Constraints can be set either by exploiting angular correlations between the leptons from the ZZ Ã → 4l or 2l2j decays [3,[8][9][10][11][12][13][14] or through angular correlations in the tagging jets in the weak boson fusion (WBF) production mechanism [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

ConstrainingCP-violating Higgs sectors at the LHC using gluon fusion

et al. 2014

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Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review D 90, 073008 c 2014 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society. Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We investigate the constraints that the LHC can set on a 126 GeV Higgs boson that is an admixture of CP eigenstates. Traditional analyses rely on Higgs couplings to massive vector bosons, which are suppressed for CP-odd couplings, so that these analyses have limited sensitivity. Instead we focus on Higgs production in gluon fusion, which occurs at the same order in α S for both CP-even and -odd Higgs couplings to top quarks. We study the Higgs plus two jet final state followed by Higgs decay into a pair of tau leptons. We show that using the 8 TeV data set it is possible to rule out the pure CP-odd hypothesis in this channel alone at nearly 95% C.L, assuming that the Higgs is CP-even. We also provide projected limits for the 14 TeV LHC run.

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“…Backgrounds with a W instead of a Z boson may be suppressed by vetoing extra leptons. NLO cross section values are estimated via Kfactors: K ≃ 1.65, 1.3 respectively for Zγγ and Zγ+jets [33], K ≃ 1.3 for Zh [34] and K ≃ 2.27, 1.8, 1.69 respectively for our signal benchmarks A, B, C through Sushi. In Table I we show the expected signal and background events for LHC at 14 TeV with an integrated luminosity L = 300 fb −1 , after event selection and in the signal region.…”

Section: Mono-higgsmentioning

confidence: 99%

“…The SM irreducible backgrounds are ZZ → ℓ + ℓ − νν and W W → ℓ + ν ℓ −ν , while W Z → ℓν ℓ + ℓ − and tt → bℓ + νbℓ −ν are the most important reducible backgrounds. NLO cross sections are estimated via K-factors: K ≃ 1.2, 1.79, 1.68 respectively for ZZ, W Z and W W [35], K ≃ 1.5 for tt [34] and K ≃ 2.36, 1.88, 1.75 respectively for our signal benchmarks A, B, C via Sushi. Our event selection follows [12] and is discussed above, and we define three signal regions E T / , P γγ T > 90 GeV, 190 GeV, 290 GeV to respectively maximixe sensitivity to benchmarks A, B, C.…”

Section: Mono-zmentioning

confidence: 99%

Looking through the pseudoscalar portal into dark matter: Novel mono-Higgs and mono-Zsignatures at the LHC

2016

Phys. Rev. D

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Mono-X signatures are a powerful collider probe of the nature of dark matter. We show that mono-Higgs and mono-Z may be key signatures of pseudo-scalar portal interactions between dark matter and the SM. We demonstrate this using a simple renormalizable version of the portal, with a Two-Higgs-Doublet-Model as electroweak symmetry breaking sector. Mono-Z and mono-Higgs signatures in this scenario are of resonant type, which constitutes a novel type of dark matter signature at LHC.The nature of dark matter (DM) is an outstanding mystery at the interface of particle physics and cosmology. The current DM candidate paradigm is the so-called Weakly-Interacting-Massive-Particle (WIMP), a particle whose relic abundance is obtained via thermal freezeout in the early Universe, and with a mass in the range GeV − TeV, around the scale of electroweak (EW) symmetry breaking v = 246 GeV. WIMP DM is very wellmotivated in connection with new physics close to the EW scale (see [1] for a review) and/or the existence of a hidden sector (singlet under the SM gauge group) which interacts with the SM via a portal [2,3].A large experimental effort aims to reveal the nature of (WIMP) DM and its interactions with SM particles, either indirectly by measuring the energetic SM particles product of DM annihilations in space, or directly by measuring the scattering of ambient DM from heavy nuclei. Current best experimental limits on the spinindependent DM interaction cross section with nuclei by the Large-Underground-Xenon (LUX) experiment [4] are very strong, and particularly constraining for DM masses in the range 10 − 100 GeV. On the other hand, the experimental limits on spin-dependent DM-nucleon interactions are much less stringent, generically favouring a pseudo-scalar mediator of DM-nucleon interactions (which primarily yields spin-dependent interactions) over a scalar mediator.Direct/indirect probes of DM are complemented by searches at colliders, where pairs of DM particles could be produced. These escape the detector and manifest themselves as events showing an imbalance in momentum conservation, via the presence of missing transverse momentum E T / recoiling against a visible final state X. Searches for events with large E T / are a major activity at the Large Hadron Collider (LHC) precisely due to their (potential) connection to DM [5].Searches for DM in X + E T / channels, referred to as mono-X, can be classified according to the visible particle(s) X against which the invisible particles recoil. Experimental studies at Tevatron and LHC have considered cases in which X is a hadronic jet [6-8], a photon γ [9, 10], W or Z bosons [11,12] and, after the recent discovery of the Higgs boson [13,14], have also considered X to be the 125 GeV Higgs particle h [15]. Indeed, if DM is linked to the EW scale, W , Z and Higgs boson signatures are natural places to search for it, with mono-W, Z, h having been recently considered as a paradigm for such potential signatures [16][17][18][19][20][21][22].With the EW symmetry breaking sector being a...

show abstract

Higgs characterisation via vector-boson fusion and associated production: NLO and parton-shower effects

Cited by 66 publications

References 154 publications

The effective Standard Model after LHC Run I

The effective Standard Model after LHC Run I

ConstrainingCP-violating Higgs sectors at the LHC using gluon fusion

Looking through the pseudoscalar portal into dark matter: Novel mono-Higgs and mono-Zsignatures at the LHC

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