Aad, Georges Abbott, Brad Abbott, Dale Charles Abed Abud, Adam Abeling, Kira Abhayasinghe, Deshan Kavishka Abidi, Syed Haider AbouZeid, Ossama Abraham, Nicola Abramowicz, Halina
...

A search for heavy resonances decaying into a pair of $Z$ bosons leading to $\ell^+\ell^-\ell'^+\ell'^-$ and $\ell^+\ell^-\nu\bar\nu$ final states, where $\ell$ stands for either an electron or a muon, is presented. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV collected from 2015 to 2018 that corresponds to the ...

Coraline, Stasser Sarrazin, Michael

Many works, aiming to explain the origin of dark matter or dark energy, consider the existence of hidden (brane)worlds parallel to our own visible world - our usual universe - in a multidimensional bulk. Hidden braneworlds allow for hidden copies of the Standard Model. For instance, atoms hidden in a hidden brane could exist as dark matter candidat...

Abu-Ajamieh, Fayez Chang, Spencer Chen, Miranda Luty, Markus A.

A primary goal of present and future colliders is measuring the Higgs couplings to Standard Model (SM) particles. Any observed deviation from the SM predictions for these couplings is a sign of new physics whose energy scale can be bounded from above by requiring tree-level unitarity. In this paper, we extend previous work on unitarity bounds from ...

Malek, Emanuel Samtleben, Henning

Exceptional field theories yield duality-covariant formulations of higher-dimensional supergravity. They have proven an efficient tool for the construction of consistent truncations around various background geometries. In this paper, we demonstrate how the formalism can moreover be turned into a powerful tool for computing the Kaluza-Klein mass sp...

Nortier, Florian

Recently, several arguments appeared in the literature that braneworld effective models with fields stricly localized on zero-thickness branes cannot be UV-complete by a fundamental theory inluding gravity. The authors concluded that one should instead consider only models with quasi-localized higher-dimensional fields. In this letter, we point out...

Benakli, Karim Branchina, Carlo Lafforgue-Marmet, Gaëtan

Tiny values for gauge couplings of dark photons allow to suppress their kinetic mixing with ordinary photons. We point out that the Weak Gravity Conjecture predicts consequently low ultraviolet cut-offs where new degrees of freedom might appear. In particular, a mixing angle of $\mathcal{O}(10^{-15})$, required in order to fit the excess reported b...

Dona, Pietro Fanizza, Marco Sarno, Giorgio Speziale, Simone

The Lorentzian EPRL spin foam amplitude for loop quantum gravity is a multi-dimensional non-compact integral of highly oscillating functions. Using a method based on the decomposition of Clebsch-Gordan coefficients for the unitary infinite-dimensional representations of SL(2,C) in terms of those of SU(2), we are able to provide for the first time n...

Andriot, David Tsimpis, Dimitrios
Published in
Journal of High Energy Physics

We study gravitational waves propagating on a warped Minkowski space-time with D − 4 compact extra dimensions. While Kaluza-Klein scales are typically too high for any current detection, we analyse how the warp factor changes the Kaluza-Klein spectrum of gravitational waves. To that end we provide a complete and explicit expression for the warp fac...

Alkalaev, Konstantin Bekaert, Xavier
Published in
Journal of High Energy Physics

We aim at formulating a higher-spin gravity theory around AdS2 relevant for holography. As a first step, we investigate its kinematics by identifying the low-dimensional cousins of the standard higher-dimensional structures in higher-spin gravity such as the singleton, the higher-spin symmetry algebra, the higher-rank gauge and matter fields, etc. ...

Kastikainen, Jani

We study codimension-even conical defects that contain a deficit solid angle around each point along the defect. We show that they lead to a delta function contribution to the Lovelock scalar and we compute the contribution by two methods. We then show that these codimension-even defects appear as Euclidean brane solutions in higher dimensional top...