Testing anomalous gauge couplings of the Higgs boson via weak-boson scatterings at the CERN LHC

Zhang, Bin; Kuang, Yu-Ping; He, H.; Yuan, C. P.

doi:10.1103/physrevd.67.114024

Cited by 41 publications

(59 citation statements)

References 64 publications

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“…For example, O BW and O Φ,1 are related to the oblique correction parameters S and T , and are thus strongly constrained by the precision EW data. The 2σ constraints on |f BW /Λ 2 | and |f Φ,1 /Λ 2 | are: [20]. The operators O Φ,2 and O Φ,3 are related to the triple and quartic Higgs boson self-interactions, and have been studied in detail in Ref.…”

Section: B Anomalous Gauge Couplingsmentioning

confidence: 99%

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Model-independent probe of anomalous heavy neutral Higgs bosons at the LHC

2014

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We first formulate, in the framework of effective Lagrangian, the general form of the effective interactions of the lightest Higgs boson h and a heavier neutral Higgs boson H in a multi-Higgs system taking account of Higgs mixing effect. We regard h as the discovered Higgs boson which has been shown to be consistent with the standard model (SM) Higgs boson. The obtained effective interactions contain extra parameters reflecting the Higgs mixing effect. Next, We study the constraints on the anomalous coupling constants of H from both the requirement of the unitarity of the S-matrix and the exclusion bounds on the SM Higgs boson obtained from the experimental data at the 7-8 TeV LHC. From this we obtain the available range of the anomalous coupling constants of H, with which H is not excluded by the yet known theoretical and experimental constraints. We then study the signatures of H at the 14 TeV LHC. In this paper, we suggest taking weak-boson scattering and pp → V H * → V V V as sensitive processes for probing H model independently at the 14 TeV LHC. We take several examples with the anomalous HV V coupling constants in the available ranges to do the numerical study. a full tree-level calculation at the hadron level is given with signals and backgrounds carefully calculated. We impose a series of proper kinematic cuts to effectively suppress the backgrounds. It is shown that, in both the V V scattering and the pp → V H * → V V V processes, H boson can be discovered from the invariant mass distributions of the final state particles with reasonable integrated luminosity. Especially, in the pp → V H * → V V V process, the invariant mass distribution of the final state jets can show a clear resonance peak of H. Finally, we propose several physical observables from which the values of the anomalous coupling constants f W and f W W can be measured experimentally.

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Section: B Anomalous Gauge Couplingsmentioning

confidence: 99%

“…[20], in which the effective couplings for a single-Higgs system, and the pure leptonic decay mode of the final state W bosons was considered. It showed that the required integrated luminosity was high.…”

Section: General Features Of Studying the Lhc Signatures Of Hmentioning

confidence: 99%

Model-independent probe of anomalous heavy neutral Higgs bosons at the LHC

2014

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“…(3.6) comes form the normalization of the Higgs boson kinetic term which gets modified due to higher dimensional operators. The constraints coming from the electroweak precision data are [17], …”

Section: Jhep12(2013)077mentioning

confidence: 99%

Effect of anomalous couplings on the associated production of a single top quark and a Higgs boson at the LHC

Agrawal

Mitra

Shivaji

2013

J. High Energ. Phys.

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Abstract:We consider the production of a single top quark in association with a Higgs boson at the LHC. In particular, we compute the cross sections for the processes pp → thj, thb, thW , thjj, thjb, thW j, thW b in the presence of the anomalous W tb, W W h and tth couplings. We find that the anomalous W tb and tth couplings can enhance the cross sections significantly. We also analyze a few signatures and show that, if these couplings are indeed anomalous, then with enough data, one should be able to observe the production of the Higgs boson in association with single top quark.

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“…The deviations of Higgs couplings are encoded in the higher dimensional effective Lagrangian coefficients including their renormal ization group flow at the loop level [35][36][37][38][39][40][55][56][57][58][59][60], Due to the presence of such higher dimensional oper ators, perturbative unitarity of the scattering amplitudes is violated at a certain high energy scale (cutoff scale of the effective theory) in the effective field theory [64,65], Yet unknown UV completion theory therefore needs to replace the effective field theory above the cutoff scale. In this sense, in addition to the studies of the effective field theory, we need to study UV completions model dependently.…”

Section: Introductionmentioning

confidence: 99%

Does unitarity imply finiteness of electroweak oblique corrections at one loop? Constraining extra neutral Higgs bosons

2015

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Introducing an arbitrary number of neutral Higgs bosons in the electroweak symmetry breaking sector, we derive a set of conditions among Higgs couplings which need to be satisfied to maintain the unitarity of the high energy scattering amplitudes of weak gauge bosons at the tree level (unitarity sum rules). It is shown that the unitarity sum rules require the tree level p parameter to be 1, without explicitly invoking the custodial symmetry arguments. The one loop fmiteness of the electroweak oblique corrections is automatically guaranteed once these unitarity sum rules are imposed among Higgs couplings. Severe constraints on the lightest Higgs coupling (125 GeV Higgs coupling) and the mass of the second lightest Higgs boson are obtained from the unitarity and the results of the electroweak precision tests (oblique parameter measurements). These results are compared with the effective theory of the light Higgs boson, and we find simple relationships between the mass of the second lightest Higgs boson in our framework and the ultraviolet cutoff in the effective theory framework.PHYSICAL REVIEW D 91, 034030 (2015) RYO NAGAI, MASAHARU TANABASHI, AND KOJI TSUMURA 034030-4 DOES UNITARITY IMPLY FINITENESS OF ... PHYSICAL REVIEW D 91, 034030 (2015)

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Testing anomalous gauge couplings of the Higgs boson via weak-boson scatterings at the CERN LHC

Cited by 41 publications

References 64 publications

Model-independent probe of anomalous heavy neutral Higgs bosons at the LHC

Model-independent probe of anomalous heavy neutral Higgs bosons at the LHC

Effect of anomalous couplings on the associated production of a single top quark and a Higgs boson at the LHC

Does unitarity imply finiteness of electroweak oblique corrections at one loop? Constraining extra neutral Higgs bosons

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