Invisible Higgs Decay at the LHeC

Tang, Yi-Lei; Zhang, Chen; Zhu, Shou-hua

doi:10.48550/arxiv.1508.01095

Cited by 5 publications

(6 citation statements)

References 12 publications

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“…energy up to 3.5 TeV with comparable luminosities to the LHeC [76]. There are a lot of works, for example, [77][78][79][80][81][82][83], etc, that have been done in the content of new physics searches, based on such proposed colliders, in order trying hard to enrich the physics motivations.…”

Section: Process Analysis and Numerical Calculationsmentioning

confidence: 99%

Exploring the anomalous top–Higgs FCNC couplings at the electron proton colliders

Sun

Luo

2018

Eur. Phys. J. C

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We perform an updated analysis on the searches for the anomalous FCNC Yukawa interactions between the top quark, the Higgs boson, and either an up or charm quark tqh, q = u, c). We probe the observability of the FCNC top-Higgs couplings through the processes e − p → ν et → ν e hq signal I) and e − p → ν e hb signal II) at the proposed electron proton ep colliders, where the Higgs boson decays to a bb pair. We find that at the high-luminosity (1 ab −1 ) ep colliders where the electrons have a polarization of 80% and electron energy is typical 60 GeV, the 2σ upper limits on Brt → uh) are 0.15×10 −2 2.9×10 −4 ) at the 7TeV@LHeC 50TeV@FCC-eh) for signal I and 0.15 × 10 −2 2.2 × 10 −4 ) for signal II. We also give an estimate on how the sensitivity (taking signal I as example) would change when we reduce the electron beam energy from 60 to 50 GeV or even 40 GeV due to the cost. The conclusion is that the discovery potential is reduced 8.7% (29.4%) if the electron beam changes from 60 to 50 (40) GeV at the 7 TeV LHeC, and 16.8% (19.8%) at the 50 TeV FCC-eh.

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Section: Process Analysis and Numerical Calculationsmentioning

confidence: 99%

Exploring the anomalous top–Higgs FCNC couplings at the electron proton colliders

Sun

Luo

2018

Eur. Phys. J. C

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“…Like the SM Higgs boson, the additional scalar h 2 in the U (1) L µ −L τ model is produced via two major channels: the charged current (CC) production channel via W + W − fusion and the neutral current (NC) production channel via ZZ fusion [51,52] at e-p colliders. Fig.…”

Section: Productions Of the Scalar Hmentioning

confidence: 99%

“…In this work, we do not simulate both of them because their contributions can be negligible after all selection cuts. The signal and background events are generated with following basic cuts [51] in Madgraph5/aMC@NLO [53] • lepton transverse momentum p T (l ± ) > 5 GeV,…”

Section: Signatures Of the New Particles H 2 And Z µτ At E-p Collidersmentioning

confidence: 99%

The signatures of the new particles $$h_{2}$$ and $$Z^{}_{\mu \tau }$$ at e-p colliders in the $${U(1)}_{L^{}_{\mu } - L^{}_{\tau } }$$ model

Hou

Yue

2019

Eur. Phys. J. C

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Considering the superior performances of the two future e-p colliders, LHeC and FCC-eh, we discuss the feasibility of detecting the additional neutral scalar h 2 and the light gauge boson Z µτ , which are predicted by the U (1) L µ −L τ model. Taking into account the experimental constraints on the relevant free parameters, we consider all possible production channels of h 2 and Z µτ at e-p colliders and further investigate their observability through the optimal channels in the case of the beam polarization P(e − )= -0.8. We find that the signal significance above 5σ of h 2 as well as Z µτ detecting can be achieved via e − p → e − jh 2 (→ Z µτ Z µτ ) → e − j + E T process and a 5σ sensitivity of Z µτ detecting can be gained via e − p → e − jh 1 (→ Z µτ Z µτ ) → e − j + E T process at e-p colliders with appropriate parameter values and a designed integrated luminosity. * the U (1) L µ −L τ model is that the anomaly cancellation does not require any extra chiral fermionic degrees of freedom. In this model, the breaking of L µ − L τ symmetry conduces to additional terms in the neutrino mass matrix, which offer an explanation for the neutrino masses and mixing simultaneously [34,35]. Besides, the scalar sector has been expanded by two additional complex scalar singlets (φ H and φ DM ) with nonzero L µ − L τ charge. The scalar φ DM can act as a viable DM candidate [36]. The other scalar φ H acquires a vacuum expectation value (VEV) v µτ and thereby making an additional neutral scalar h 2 product after spontaneous breaking of U (1) L µ −L τ , which indicates that h 2 has a mass of the same order with v µτ about 10 GeV -1000 GeV [33,37]. Owing to the significance of precise measurement of Higgs boson properties, many people are sparing no effort to search for the additional neutral scalars which can be produced and decay via their mixing with the SM-like Higgs boson h 1 [47].On the other hand, an extra neutral gauge boson Z µτ is also introduced and obtains a mass after spontaneous symmetry breaking of U (1) L µ −L τ . Z µτ does not couple to the SM quarks and the first generation leptons, which makes it immune to any restrictions coming from lepton and hadron colliders such as LEP and LHC. Therefore, the mass of Z µτ can be as light as 100 MeV for a low value of gauge coupling g µτ ≤ 10 −3 , which is required to meet the limits arising from neutrino trident production. The Z µτ with an MeV-scale mass can resolve the muon (g − 2) anomaly, explain the deficit of cosmic neutrino flux [34,39,40] and resolve the problem of relic abundance of DM in the scenario with a light weakly interacting massive particle [41-43] simultaneously. Therefore, searching for its possible collider evidences plays a vital role in exploring NP. Many attempts to discover this kind of new particles have been made in the meson decay experiment [44], beam dump experiment [45], electron-positron collider experiments [46] and so on.Searches for the new particles predicted by the U (1) L µ −L τ model are presently being conducted at the LHC and ILC [3...

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“…We will study the cascade decay channels in details in the future. LHeC [118,119] would be a better collider in searching for the exotic Higgs decays [120]. At future e + e − colliders [121][122][123][124], η is also possible to be discovered through Higgs rare decay processes, such as e + e − → Zh(→ ηη).…”

Section: Predictions and Future Tests For This Scenariomentioning

confidence: 99%

Lightness of a Higgs boson and spontaneousCP-violation in the Lee model: An alternative scenario

Mao

Zhu

2016

Phys. Rev. D

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Based on the weakly-coupled spontaneous CP-violation two-Higgs-doublet model (named Lee model) and the mechanism to generate the correlation between smallness of CP-violation and lightness of scalar mass, as we proposed earlier, we predicted a light CP-mixing scalar η in which pseudoscalar component is dominant. It is a natural scenario in which m η ∼ O(10GeV) v. It means new physics might be hidden below the electro-weak scale v. Masses of all other scalars (h, H, H ± ) should be around the electro-weak scale v. Among them, the 125 GeV Higgs boson (h)couplings are standard-model like, and the charged Higgs boson (H ± ) mass should be around the heaviest neutral scalar (H) mass. We discussed all experimental constraints and showed that this scenario is still allowed by data. The strictest constraints come from the flavor violation experiments and the EDM of electron and neutron. We also discussed the future tests for this scenario. It is possible to discover the extra scalars or exclude this scenario at future colliders, especially at the LHC and e + e − colliders with O(ab −1 ) luminosity. We also pointed out that the Z-mediated Higgs pair production via e + e − → h i h j (h i , h j stand for two of the η, h, H) would be the key observable to confirm or exclude CP-violation in Higgs sector. The sensitivity to test this scenario is worth further studying in

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Invisible Higgs Decay at the LHeC

Cited by 5 publications

References 12 publications

Exploring the anomalous top–Higgs FCNC couplings at the electron proton colliders

Exploring the anomalous top–Higgs FCNC couplings at the electron proton colliders

The signatures of the new particles $$h_{2}$$ and $$Z^{}_{\mu \tau }$$ at e-p colliders in the $${U(1)}_{L^{}_{\mu } - L^{}_{\tau } }$$ model

Lightness of a Higgs boson and spontaneousCP-violation in the Lee model: An alternative scenario

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