Z boson decay to photon plus Kaluza-Klein graviton in large extra dimensions

Abstract

In the large extra dimensional ADD scenario, Z bosons undergo a one-loop decay into a photon and Kaluza-Klein towers of gravitons/gravi-scalars. We calculate such a decay width, extending previous arguments about the general form of the four-dimensional on-shell amplitude. The amplitudes calculated are relevant to processes in other extra dimensional models where the Standard Model fields are confined to a 4-brane.

arXiv comment47 pages, uses feynmp for diagrams. v2: typographical corrections for letter-sized paper and to correct feynmf parsing error. v3: minor error in polarisation averaging and reference corrected. v4: reflects changes for published version; arithmetic error corrected and reference updated; section on transversality conditions not present in published version retained

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• $Z$-boson decays into an invisible dark photon at the LHC, HL-LHC and future lepton colliders
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• Search for high-mass $W\gamma$ and $Z\gamma$ resonances using hadronic W/Z boson decays from 139 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
• Production of a Z boson and a photon via a Randall-Sundrum-type graviton at the Large Hadron Collider
• Z boson decay to photon plus Kaluza-Klein graviton: large extra dimensional bounds
• Kaluza-Klein towers for real vector fields in flat space
• Searches for Power-Law Warped Extra Dimensions