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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A number of extensions of the Standard Model predict the existence of newlight, weakly-coupled particles that couple to the visible sector throughhigher-dimensional operators containing one or two photons, suppressed by ahigh new physics scale, and thus have long lifetimes. In this work, we studythe prospects for detecting three $\sim\,$sub-GeV such long-lived particles(LLP) at intensity frontier experiments: a massive spin-2 mediator ($G$), adark axion portal, and a light neutralino coupled to ALPino or gravitino. Weconsider the production and visible decays of these particles in severalcurrent and proposed beam dump experiments (CHARM, NuCal, SeaQuest, NA62, SHiP)as well as in the LHC detectors (FASER, FASER$\nu$, FLArE, MATHUSLA). Inaddition to the usual displaced vertex signature, we also examine the impact ofelectron scattering signature and the Primakoff-like process which leads toconversion of $G$ into a photon or to the secondary LLP production viaupscattering of the lighter dark sector state on dense material put in front ofthe detector. In all cases, we find the SHiP experiment could provide thestrongest constraints for the displaced vertex search, while FASER2/FPF couldprovide complementary coverage of the $\gamma c\tau \sim 1$ m decay lengthregion of the parameter space.

Probing some photon portals to new physics at intensity frontier experiments