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arXiv · 1703.10600

Probing the anomalous $γγγZ$ coupling at the LHC with proton tagging

Cristian Baldenegro·Sylvain Fichet·Gero von Gersdorff·Christophe Royon
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Abstract

The sensitivities to the anomalous quartic gauge boson coupling $γγγZ$ are estimated via $γZ$ production with intact protons in the forward region at the LHC. Proton tagging proves to be a powerful tool to suppress the background, which allows consideration of the hadronic decays of the $Z$ boson in addition to the leptonic ones. We discuss the discovery potential for an integrated luminosity of $300\,\mathrm{fb}^{-1}$ and $3000\,\mathrm{fb}^{-1}$. The sensitivity we obtain at $300\,\mathrm{fb}^{-1}$ goes beyond the one expected from LHC bounds on the $Z\rightarrow γγγ$ decay by about three orders of magnitude. The $γZ$ channel provides important discriminatory information with respect to the exclusive $γγ$ channel, as many particles beyond the Standard Model (such as a radion or Kaluza Klein gravitons) predict a signal in the latter but not the former.

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Cristian Baldenegro, Sylvain Fichet, Gero von Gersdorff, Christophe Royon. 2017-08-24. Probing the anomalous $γγγZ$ coupling at the LHC with proton tagging. https://doi.org/10.1007/jhep06(2017)142

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