Probing new physics scales from Higgs and electroweak observables at e + e − Higgs factory

Ge, Shao-Feng; He, H.; Xiao, R.

doi:10.1007/jhep10(2016)007

Cited by 53 publications

(36 citation statements)

References 108 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[5] as well as Refs. [6][7][8][9][10][11][12][13][14]. In such a situation, a robust determination of the Higgs self coupling can only be obtained through a global fit that takes into account possible deviations in other SM couplings.…”

Section: Introductionmentioning

confidence: 99%

A global view on the Higgs self-coupling at lepton colliders

Vita

Durieux

Grojean

et al. 2018

J. High Energ. Phys.

111

View full text Add to dashboard Cite

We perform a global effective-field-theory analysis to assess the precision on the determination of the Higgs trilinear self-coupling at future lepton colliders. Two main scenarios are considered, depending on whether the center-of-mass energy of the colliders is sufficient or not to access Higgs pair production processes. Low-energy machines allow for ∼ 40% precision on the extraction of the Higgs trilinear coupling through the exploitation of next-to-leading-order effects in single Higgs measurements, provided that runs at both 240/250 GeV and 350 GeV are available with luminosities in the few attobarns range. A global fit, including possible deviations in other SM couplings, is essential in this case to obtain a robust determination of the Higgs self-coupling. High-energy machines can easily achieve a ∼ 20% precision through Higgs pair production processes. In this case, the impact of additional coupling modifications is milder, although not completely negligible.

show abstract

Section: Introductionmentioning

confidence: 99%

A global view on the Higgs self-coupling at lepton colliders

Vita

Durieux

Grojean

et al. 2018

J. High Energ. Phys.

111

View full text Add to dashboard Cite

show abstract

“…At a lepton collider, the hV V couplings can be determined with high precision and independent of any model assumptions. Studies for CEPC and ILC imply that at both colliders, g W,a1 can be constrained down to 1% precision [92,98]. The projection for a global modelindependent of CLIC data yields similar results for achievable accuracy on the hV V couplings [53].…”

Section: • Constraints On L V Hmentioning

confidence: 85%

Multi-Higgs boson production and unitarity in vector-boson fusion at future hadron colliders

et al. 2020

View full text Add to dashboard Cite

We study multi-Higgs final states in vector boson fusion (VBF) processes at the LHC and at future proton-proton colliders, focusing on the prospects for measurements at 27 TeV and at 100 TeV. We use an effective Lagrangian which includes higher-dimensional operators in the mass eigenstates which are relevant to VBF processes and relate this to specific param-At the LHC, the dominant SM process of multi-Higgs production is gluon-gluon-fusion (ggF) via a heavy top-quark loop. Current LHC data constrain the triple Higgs self-coupling only very weakly [3], and not at all the quartic Higgs self-coupling. Multiple groups have evaluated the potential for a first meaningful measurement of the triple Higgs self-coupling at future highluminosity runs of the LHC [4-10]. The considered decay channels of the Higgs pair include and bbbb [18, 22, 23]. It is expected that the triple self-coupling can be constrained within 40% accuracy after collecting 3 ab −1 of data at the 14 TeV LHC [24]. There will be no access to the quartic self-coupling. Beyond the LHC, at a future 100 TeV hadron collider, the Higgs pair-production rate is enhanced significantly [9,13,[25][26][27][28][29][30], allowing for a more accurate determination of the Higgs potential.A subdominant process of multi-Higgs production in hadron collisions is vector-bosonfusion (VBF) [31], W + W − → hh, where the W bosons are effectively radiated from incoming quarks. In addition to its dependence on the Higgs self-interaction, this process also gives access to the hhW W coupling, which is another SM interaction that has not been accessible by other means. In fact, the hVV (V = W ± , Z ) couplings can be derived from the precise measurement of the decay branching fractions h → W W * and h → Z Z * at the LHC, up to a common normalization factor. The current LHC data on the decay branching fractions for these channels are consistent with the SM predictions [32, 33]. By contrast, there are no significant constraints from data on hhV V direct couplings.The VBF mode of double-Higgs production at hadron colliders has been studied in Refs. [34][35][36][37][38]. Beyond tree level, the NLO QCD correction enhances the cross section by ∼ 7% [39,40]. In the high-luminosity mode of the LHC (HL-LHC) with 3000 fb −1 at 14 TeV, the hhV V interaction can be constrained to 20%. A 100 TeV hadron collider has the potential to reduce the uncertainty down to 1% [37]. The hhW W coupling is also accessible in the W ± W ± h final state. In Ref. [41] it is found that this particular final state can constrain this coupling to O(100%) at the HL-LHC, and to 20% at a 100 TeV collider.The other modes of double Higgs production are tt hh or V hh production. The production rates of these mode are smaller than ggF and VBF mode. The discussion of these modes is beyond the scope of current work. For interested readers, we refer to [39,40,[42][43][44][45][46][47][48].Measuring the quartic Higgs self-coupling in the SM is a much more challenging task. At the 14 TeV LHC, the cross section of g g → hhh is onl...

show abstract

“…[50], as well as similar studies in Refs. [49,51,64,65]. The normalization of Wilson coefficients in Table 1 is different from that defined in Eq.…”

Section: Operatormentioning

confidence: 99%

Universal relations in composite Higgs models

Liu

Low

Yin

2019

J. High Energ. Phys.

View full text Add to dashboard Cite

We initiate a phenomenological study of "universal relations" in composite Higgs models, which are dictated by nonlinear shift symmetries acting on the 125 GeV Higgs boson. These are relations among one Higgs couplings with two electroweak gauge bosons (HVV), two Higgses couplings with two electroweak gauge bosons (HHVV), one Higgs couplings with three electroweak gauge bosons (HVVV), as well as triple gauge boson couplings (TGC), which are all controlled by a single input parameter: the decay constant f of the pseudo-Nambu-Goldstone Higgs boson. Assuming custodial invariance in strong sector, the relation is independent of the symmetry breaking pattern in the UV, for an arbitrary symmetric coset G/H. The complete list of corrections to HVV, HHVV, HVVV and TGC couplings in composite Higgs models is presented to all orders in 1/f , and up to four-derivative level, without referring to a particular G/H. We then present several examples of universal relations in ratios of coefficients which could be extracted experimentally. Measuring the universal relation requires a precision sensitive to effects of dimension-8 operators in the effective Lagrangian and highlights the importance of verifying the tensor structure of HHVV interactions in the standard model, which remains untested to date. arXiv:1809.09126v1 [hep-ph]

show abstract

Probing new physics scales from Higgs and electroweak observables at e + e − Higgs factory

Cited by 53 publications

References 108 publications

A global view on the Higgs self-coupling at lepton colliders

A global view on the Higgs self-coupling at lepton colliders

Multi-Higgs boson production and unitarity in vector-boson fusion at future hadron colliders

Universal relations in composite Higgs models

Contact Info

Product

Resources

About