Abstract
As one category of vector boson fusion, photo-production is one important production mechanism at e-p colliders. A future e-p collider – Large Hadron-electron Collider (LHeC) has been discussed as a “Higgs factory” candidate where the Higgs boson produced via weak boson fusion (WBF) at the LHeC plays an important role in precision measurement of Yukawa couplings. On the other hand, a measurement of photo-production of the Higgs boson, if possible, might be complementary to the measurement of Higgs to di-photon partial decay width Γ(h→γγ). In this paper, we study the possibility of measuring this production process at the LHeC with the help of the photon PDFs published in recent years. This process has a clean final state without additional colored particles in the detectable region other than the decay products of the Higgs. We compute the cross sections of all related processes and find that the production rate is at the same order as the neutral current WBF production of Higgs boson with missing forward jets. However, a detailed phenomenological study of various Higgs decay channels shows that even in the most promising semi-leptonic WW channel, the feasibility of identifying such photo-production is negative due to an irreducible photo-production of W+W−.
Highlights
The discovery of a 125 GeV Standard Model (SM) like Higgs boson by the ATLAS and CMS collaborations at the CERN Large Hadron Collider (LHC) [1, 2] has significantly improved our knowledge over the mechanism behind spontaneous electroweak gauge symmetry breaking
There exists a proposal for an e-p collider known as the Large Hadron-electron Collider (LHeC), planned to be constructed by adding an electron beam of 60-140 GeV to the current LHC [3]
The leading production mode of Higgs boson at the LHeC is via charged-current weak boson fusion (WBF) : e + p → νe + h + j
Summary
The discovery of a 125 GeV Standard Model (SM) like Higgs boson by the ATLAS and CMS collaborations at the CERN Large Hadron Collider (LHC) [1, 2] has significantly improved our knowledge over the mechanism behind spontaneous electroweak gauge symmetry breaking. Besides the direct search of such models of physics beyond SM (BSM), precision measurement of Higgs boson couplings and properties at the same time plays an important role in testing various BSM physics models. For this purpose, proposals of future electron-positron colliders, such as, FCC-ee, ILC and CEPC, have been widely discussed in the community. LHeC was initially proposed as a TeV deep-inelastic scattering (DIS) facility with 60 GeV electron beam and 2 ab−1 designed integrated luminosity to improve the measurement of parton distribution functions at large Bjorken x. The results will be shown and briefly discussed in the last section
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