PROBING ANOMALOUS HZZ COUPLINGS AT THE LHeC

We study the accuracy with which the lowest order C P conserving anomalous W tb couplings in the single top-quark production at the proposed large hadron electron collider can be probed. The one-dimensional distribution of various kinematic observables at the parton level MC and their asymmetries arising due to the presence of anomalous couplings both in the hadronic and leptonic W decay is examined. We find that at 95 % CL the anomalous coupling associated with the left-handed vector current can be measured at an accuracy of the order of ∼10 −2 -10 −3 , while those associated with the right-handed vector and left-as well as right-handed tensor currents have a sensitivity at the order of ∼10 −1 -10 −2 for the systematic uncertainty varying between 10-1 % at an integrated luminosity of 100 fb −1 . A comprehensive analysis of the combined covariance matrix derived from all onedimensional distributions of kinematical observables is used to compute the errors in the anomalous couplings.

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“…The sensitivity of the W tb couplings is also investigated through the sub-dominant associated t W production in Refs. [45,46].…”

Section: Single Antitop-quark Productionmentioning

confidence: 99%

Measuring anomalous Wtb couplings at $$e^-p$$ e - p collider

et al. 2015

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“…With such conditions the LHeC indeed becomes a Higgs boson factory and will offer exciting opportunities in precision Higgs studies, especially with respect to exotic Higgs decays. We note that there has been quite a few studies on Higgs boson physics at the LHeC [50][51][52][53][54][55][56][57][58]. The possibility of using the LHeC to study BSM Higgs decays has been mentioned in [49].…”

Section: Introductionmentioning

confidence: 99%

Invisible Higgs decay at the Large Hadron-Electron Collider

Tang¹,

Zhang²,

Zhu³

2016

Phys. Rev. D

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The possibility that the 125 GeV Higgs boson may decay into invisible non-standard-model (non-SM) particles is theoretically and phenomenologically intriguing. In this letter we investigate the sensitivity of the Large Hadron Electron Collider (LHeC) to an invisibly decaying Higgs, in its proposed high luminosity running mode. We focus on the neutral current Higgs production channel which offers more kinematical handles than its charged current counterpart. The signal contains one electron, one jet and large missing energy. With a cut-based parton level analysis, we estimate that if the hZZ coupling is at its standard model (SM) value, then assuming an integrated luminosity of 1 ab −1 the LHeC with the proposed 60 GeV electron beam (with −0.9 polarization) and 7 TeV proton beam is capable of probing Br(h → / E T ) = 6% at 2σ level. Good lepton veto performance (especially hadronic τ veto) in the forward region is crucial to the suppression of the dominant W je background. We also explicitly point out the important role that may be played by the LHeC in probing a wide class of exotic Higgs decay processes and emphasize the general function of lepton-hadron colliders in precision study of new resonances after their discovery in hadron-hadron collisions.

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“…With Higgs boson production cross section of about 200 fb −1 , the LHeC will provide amazing opportunities for precision Higgs physics, due to the fact that major QCD backgrounds will be much smaller than LHC and the complication due to pile-up will be greatly reduced. Previous studies on Higgs physics at the LHeC include measuring bottom Yukawa coupling [13,15,16], anomalous gauge-Higgs coupling [17][18][19], invisible Higgs decay [20] and MSSM Higgs production [21]. Studies on charm Yukawa measurements has been reported in [22].…”

Section: Introductionmentioning

confidence: 99%

Exotic Higgs decay $$h\rightarrow \phi \phi \rightarrow 4b$$ h → ϕ ϕ → 4 b at the LHeC

Tang¹,

Zhang²,

Zhu³

2017

Eur. Phys. J. C

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We study the exotic decay of the 125 GeV Higgs boson (h) into a pair of light spin-0 particles (φ) which subsequently decay and result in a 4b final state. This channel is well motivated in models with an extended Higgs sector. Instead of searching at the Large Hadron Collider (LHC) and the high luminosity LHC (HL-LHC) which are beset by large standard model (SM) backgrounds, we investigate this decay channel at the much cleaner Large Hadron Electron Collider (LHeC). With some simple selection cuts this channel becomes nearly free of background at this ep machine, in sharp contrast to the situation at the (HL-)LHC. With a parton level analysis we show that for the φ mass range [20, 60] GeV, with 100 fb −1 luminosity the LHeC is generally capable of constrainingcoupling strength relative to the SM value) to a few percent level (95% CLs). With 1 ab −1 luminosity C 2 4b at a few per mille level can be probed. These sensitivities are much better than the HL-LHC performance and demonstrate the important role expected to be played by the LHeC in probing exotic Higgs decay processes, in addition to the already proposed invisible Higgs decay channel.

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PROBING ANOMALOUS HZZ COUPLINGS AT THE LHeC

Cited by 13 publications

References 38 publications

Measuring anomalous Wtb couplings at $$e^-p$$ e - p collider

Measuring anomalous Wtb couplings at $$e^-p$$ e - p collider

Invisible Higgs decay at the Large Hadron-Electron Collider

Exotic Higgs decay $$h\rightarrow \phi \phi \rightarrow 4b$$ h → ϕ ϕ → 4 b at the LHeC

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