Exploring anomalous $HZ\gamma$ couplings in $\gamma$-proton collisions at the LHC

Abstract

The $HZ\gamma$ coupling, which is highly sensitive to the new physics beyond the standard model, is studied through the process $pp\to p\gamma p\to pHX$ at the LHC. To this purpose, an effective Lagrangian, in a model independent approach, with dimension six operators is considered in this paper. New interaction terms regarding beyond the standard model physics include the Higgs boson anomalous vertices in both CP-even and CP-odd structures. A detailed numerical analysis is performed to scrutinize the accurate constraints on the effective $HZ\gamma$ couplings and to discuss how far the corresponding bounds can be improved. This is achieved by testing all the efficient Higgs decay channels and increasing the integrated luminosity at three different forward detector acceptance regions. The numerical results propose that the Higgs photoproduction at the LHC, as a complementary channel, has a great potential of exploring the $HZ\gamma$ couplings.

arXiv comment16 pages, 5 figures, 5 tables, version accepted for publication in PLB

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• Probing Higgs boson couplings in H+$\gamma$ production at the LHC
• General one-loop formulas for decay $h\to Z\gamma$
• Search for the electromagnetic moments of the $\tau$ lepton in photon-photon collisions at the LHeC and the FCC-he
• Pinning down the gauge boson couplings in $WW\gamma$ production using forward proton tagging
• Central exclusive production of $W$ boson pairs in $pp$ collisions at the LHC in hadronic and semi-leptonic final states
• Non-standard Higgs couplings in single Higgs boson production at the LHC and future linear collider
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• T-odd anomalous interactions of the top-quark at the Large Hadron Collider
• Prospective constraints on anomalous Higgs boson interactions in an effective Lagrangian via diphoton production at FCC-hh
• Hypergeometric presentation for one-loop contributing to $H\to Z\gamma$