English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In warped 5D models of hierarchy and flavor, the first Kaluza-Klein (KK)state of the graviton $G_1$ is heavy enough to decay into a photon and itsfirst KK mode $\gamma_1$ on-shell: $G_1 \to \gamma_1 \gamma$. Thevolume-suppression of the rate for this process [relative to 2-body decay intoheavy Standard Model (SM) final states ($W/Z/t/H$)] may be partiallycompensated by the simplicity of the photon final state. We consider $\gamma_1\to W^+W^-$, with a typical O(1) branching fraction, and focus on thesemi-leptonic final state $W(\to jj) W(\to \ell, \nu)$ with $\ell=e,\mu$. TheSM background originates from $2\to 3$ parton processes and is relativelysuppressed compared to those for 2-body decays of $G_1$. Moreover, to furtherreduce the background, we can impose an invariant mass window cut for$\gamma_1$ (in addition to that for $G_1$) in this new channel. We emphasizethat this "photon cascade" decay probes a different combination of (bulk andbrane) interactions of the KK states than the decays into two heavy SM states.Thus, in combination with other channels, the cascade decay could be used toextract the individual underlying geometric parameters. The $3\sigma$ reach for$G_1$ in our channel is up to 1.5 TeV at the high luminosity (14 TeV) LHC, andcan be extended to about 4 TeV, at $5\sigma$, at a future 100 TeV hadroncollider. Along the way, we point out the novel feature that the invariant massdistribution of KK graviton decay products becomes skewed from the Breit-Wignerform, due to the KK graviton coupling growing with energy.

Photon Cascade Decay of the Warped Graviton at LHC14 and a 100 TeV Hadron Collider