Top-quark mediated effects in hadronic Higgs-Strahlung

Brein, Oliver; Harlander, Robert V.; Wiesemann, Marius; Zirke, T.

doi:10.1140/epjc/s10052-012-1868-6

Cited by 149 publications

(166 citation statements)

References 51 publications

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“…This can be extended to NNLO [47,58,59] but, in the case of ZH production, one needs to include the gg initiated contribution, gg → ZH [59][60][61] as well as some additional subleading corrections [62]. The same is also true for double Higgs-strahlung and we will include in this paper the Drell-Yan part of the corrections up to NNLO.…”

Section: Jhep04(2013)151mentioning

confidence: 99%

The measurement of the Higgs self-coupling at the LHC: theoretical status

Baglio

Djouadi

Gröber

et al. 2013

J. High Energ. Phys.

322

407

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Now that the Higgs boson has been observed by the ATLAS and CMS experiments at the LHC, the next important step would be to measure accurately its properties to establish the details of the electroweak symmetry breaking mechanism. Among the measurements which need to be performed, the determination of the Higgs self-coupling in processes where the Higgs boson is produced in pairs is of utmost importance. In this paper, we discuss the various processes which allow for the measurement of the trilinear Higgs coupling: double Higgs production in gluon fusion, vector boson fusion, double Higgs-strahlung and associated production with a top quark pair. We first evaluate the production cross sections for these processes at the LHC with center-of-mass energies ranging from the present √ s = 8 TeV to √ s = 100 TeV, and discuss their sensitivity to the trilinear Higgs coupling. We include the various higher order QCD radiative corrections, at next-to-leading order for gluon and vector boson fusion and at next-to-next-to-leading order for associated double Higgs production with a gauge boson. The theoretical uncertainties on these cross sections are estimated. Finally, we discuss the various channels which could allow for the detection of the double Higgs production signal at the LHC and estimate their potential to probe the trilinear Higgs coupling.

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Section: Jhep04(2013)151mentioning

confidence: 99%

The measurement of the Higgs self-coupling at the LHC: theoretical status

Baglio

Djouadi

Gröber

et al. 2013

J. High Energ. Phys.

322

407

View full text Add to dashboard Cite

show abstract

“…The mass of the Higgs boson was fixed at 125 GeV and the H → bb branching fraction was fixed at 58%. The inclusive pp → V H cross-sections [44][45][46][47][48][49][50] were calculated at next-to-next-to-leading order (NNLO) (QCD) and -4 -…”

Section: Jhep12(2017)024mentioning

confidence: 99%

Evidence for the H → b b ¯ $$ H\to b\overline{b} $$ decay with the ATLAS detector

Aaboud

Aad

Abbott

et al. 2017

J. High Energ. Phys.

114

123

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A search for the decay of the Standard Model Higgs boson into a bb pair when produced in association with a W or Z boson is performed with the ATLAS detector. The analysed data, corresponding to an integrated luminosity of 36.1 fb −1 , were collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Final states containing zero, one and two charged leptons (electrons or muons) are considered, targeting the decays Z → νν, W → ν and Z → . For a Higgs boson mass of 125 GeV, an excess of events over the expected background from other Standard Model processes is found with an observed significance of 3.5 standard deviations, compared to an expectation of 3.0 standard deviations. This excess provides evidence for the Higgs boson decay into b-quarks and for its production in association with a vector boson. The combination of this result with that of the Run 1 analysis yields a ratio of the measured signal events to the Standard Model expectation equal to 0. [7]. The properties of the discovered particle have been measured using the Run 1 dataset, collected at centre-of-mass energies of 7 TeV and 8 TeV, and were found to be compatible with those predicted by the Standard Model (SM) within uncertainties, typically of the order of ±20% [8-11]. The Run 2 dataset at an energy of 13 TeV provides an opportunity to increase the precision of such measurements, and to challenge theory predictions further. While analyses of Higgs bosons decaying into vector bosons are entering an era of detailed differential measurements, direct evidence for the coupling of the Higgs boson to fermions was established only via the observation of the decay into τ -leptons through the combination of ATLAS and CMS Run 1 results [11], and, more recently, through the combination of CMS Run 1 and Run 2 results [12]. Although the gluon-gluon fusion production mode provides indirect evidence for the coupling of the Higgs boson to top quarks, there is currently no direct observation of the coupling of the Higgs boson to quarks. The decay of the SM Higgs boson into pairs of b-quarks is expected to have a branching ratio of 58% for m H = 125 GeV [13], the largest among all decay modes. Accessing H → bb decays is therefore crucial for constraining, under fairly general assumptions [14,15], the overall Higgs boson decay width. At the LHC, the very large backgrounds arising from multi-jet production make an inclusive search extremely challenging. The most sensitive production modes for probing H → bb decays are those where the Higgs boson is produced in association with a W or Z boson [16]; their leptonic decay modes lead to clean signatures that can be efficiently triggered on, while rejecting most of the multi-jet backgrounds.Searches for a Higgs boson in the bb decay mode were conducted at the Tevatron by the CDF and D0 Collaborations. They reported an excess of events in V H associated production (where V is used to denote W or Z) in the mass range of 120 GeV to 135 GeV, with a global signifi...

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“…Therefore, the same K factor is used for the signal and background [46]. Similarly, QCD and electroweak corrections are known to an accuracy of NNLO for the VBF and VH signal contributions [30,31,50], but no calculation exists beyond the LO for the corresponding background contributions. The same K factors as in signal are also assumed for the background and interference contributions.…”

Section: The Cms Experiments and Simulationmentioning

confidence: 99%

Limits on the Higgs boson lifetime and width from its decay to four charged leptons

Khachatryan¹,

Sirunyan²,

Tumasyan³

et al. 2015

Phys. Rev. D

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Constraints on the lifetime and width of the Higgs boson are obtained from H → ZZ → 4l events using data recorded by the CMS experiment during the LHC run 1 with an integrated luminosity of 5.1 and 19.7 fb −1 at a center-of-mass energy of 7 and 8 TeV, respectively. The measurement of the Higgs boson lifetime is derived from its flight distance in the CMS detector with an upper bound of τ H < 1.9 × 10 −13 s at the 95% confidence level (C.L.), corresponding to a lower bound on the width of Γ H > 3.5 × 10 −9 MeV. The measurement of the width is obtained from an off-shell production technique, generalized to include anomalous couplings of the Higgs boson to two electroweak bosons. From this measurement, a joint constraint is set on the Higgs boson width and a parameter f ΛQ that expresses an anomalous coupling contribution as an on-shell cross-section fraction. The limit on the Higgs boson width is Γ H < 46 MeV with f ΛQ unconstrained and Γ H < 26 MeV for f ΛQ ¼ 0 at the 95% C.L. The constraint f ΛQ < 3.8 × 10 −3 at the 95% C.L. is obtained for the expected standard model Higgs boson width.

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Top-quark mediated effects in hadronic Higgs-Strahlung

Cited by 149 publications

References 51 publications

The measurement of the Higgs self-coupling at the LHC: theoretical status

The measurement of the Higgs self-coupling at the LHC: theoretical status

Evidence for the H → b b ¯ $$ H\to b\overline{b} $$ decay with the ATLAS detector

Limits on the Higgs boson lifetime and width from its decay to four charged leptons

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