Measuring Higgs $ \mathcal{C}\mathcal{P} $ and couplings with hadronic event shapes

Englert, Christoph; Spannowsky, Michael; Takeuchi, Michihisa

doi:10.1007/jhep06(2012)108

Cited by 62 publications

(51 citation statements)

References 95 publications

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“…Let us consider a vector boson dark matter, X µ , which is assumed to be a gauge boson associated with Abelian dark gauge symmetry U (1) X . The simplest model will be without any matter fields charged under U (1) X except for a complex scalar, Φ (a SM singlet), whose VEV will generate the mass for X µ by the conventional Higgs mechanism: 6) in addition to the SM lagrangian. The covariant derivative is defined as…”

Section: Higgs Portal Abelian Vector Dmmentioning

confidence: 99%

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Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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Recent data on 125 GeV Higgs-like boson at the LHC starts to constrain the electroweak symmetry breaking (EWSB) sector of the SM and its various extensions. If one imposes the local gauge symmetry of the Standard Model (SM) (SU (3) c ×SU (2) L ×U (1) Y ) to the SM and any possible new physics scenarios, the SM Higgs properties will be modified by intrinsically two different ways: by new physics either coupling directly to the SM Higgs boson h, or affecting indirectly the SM Higgs properties through the mixing of h with a SM singlet scalar s. (Here s is a singlet under the SM gauge group, but may be charged under a new gauge charge and can have nonrenormalizable couplings to non-SM particles.) The models of two Higgs doublet, extra sequential and mirror fermions belong to the first category, whereas the models with a hidden sector dark matter, extra vectorlike fermions and new charged vector bosons, which can enhance the diphoton rate of the SM Higgs-like resonance, belong to the second category. We perform a global fit to data in terms of the effective Lagrangian description of two interaction eigenstates of scalar bosons, a SM Higgs and a singlet scalar, and their mixing. This framework is more suitable to study singlet-extended scenarios discussed above compared to other approaches based on the Lagrangian of mass eigenstates. With fairly model-independent assumptions, the effective Lagrangian contains at most four free parameters still encompassing the majority of models in the literature. Interestingly, the SM gives the best fit if all data from ATLAS and CMS are used, whereas various singlet extensions can fit better to individual ATLAS or CMS data. Without further assumptions, an upper bound on the total width (or, nonstandard branching ratio) is generically obtained. Furthermore, global fit based on our parameterization can be used to probe interactions of the singlet scalar if the singlet resides below 2m W .

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Section: Higgs Portal Abelian Vector Dmmentioning

confidence: 99%

“…For this purpose, its spin and parity [3][4][5][6][7][8][9][10][11][12] and its couplings to the SM particles should be determined as accurately as possible (see Ref. [13] for the review on the SM Higgs boson and references therein).…”

Section: Introductionmentioning

confidence: 99%

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Choi

Jung

2013

J. High Energ. Phys.

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“…In principle other jet distributions are also sensitive to the CP nature of . For instance, [134] has examined a set of jet shape variables for the determination of the CP nature of a SMlike Higgs boson, which are potentially interesting for as well. In the following we will examine the sensitivity to the CP nature of of the thrust of the hard jets in the event…”

Section: Cp Of From Pp → Jjmentioning

confidence: 99%

Digamma, what next?

Franceschini

Giudice

Kamenik

et al. 2016

J. High Energ. Phys.

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If the 750 GeV resonance in the diphoton channel is confirmed, what are the measurements necessary to infer the properties of the new particle and understand its nature? We address this question in the framework of a single new scalar particle, called digamma ( ). We describe it by an effective field theory, which allows us to obtain general and model-independent results, and to identify the most useful observables, whose relevance will remain also in model-by-model analyses. We derive full expressions for the leading-order processes and compute rates for higher-order decays, digamma production in association with jets, gauge or Higgs bosons, and digamma pair production. We illustrate how measurements of these higher-order processes can be used to extract couplings, quantum numbers, and properties of the new particle.

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“…We apply a typical WBF selection [25,29] and cluster jets with the anti-kT algorithm [47] as implemented in FASTJET [48] with D ¼ 0:4 and define jets with the thresholds p T;j ! 40 GeV and jy j j 4:5:…”

Section: Analysis Setupmentioning

confidence: 99%

The shape of spins

Englert¹,

Gonçalves²,

Nail³

et al. 2013

Phys. Rev. D

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Reprinted with permission from the American Physical Society: Physical Review D 88, 013016 c 2013 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.Additional information: 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. After the discovery of a Higgs-like particle at the LHC, the determination of its spin quantum numbers across different channels will be the next step in arriving at a more precise understanding of the new state and its role in electroweak symmetry breaking. Event shape observables have been shown to provide extremely sensitive observables for the discrimination of the scalar Higgs boson's CP quantum numbers as a consequence of the different radiation patterns of Higgs production via gluon fusion vs weak boson fusion in the pp ! X þ 2j selection. We show that a similar strategy serves to constrain the spin quantum numbers of the discovered particle as a function of the involved couplings. We also discuss the prospects of applying a similar strategy to future discoveries of Higgs-like particles.

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Measuring Higgs $ \mathcal{C}\mathcal{P} $ and couplings with hadronic event shapes

Cited by 62 publications

References 95 publications

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Implications of LHC data on 125 GeV Higgs-like boson for the Standard Model and its various extensions

Digamma, what next?

The shape of spins

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