The diphoton resonance as a gravity mediator of dark matter

Han, Chengcheng, Lee, Hyun Min, Park, Myeonghun and Sanz, Verónica (2017) The diphoton resonance as a gravity mediator of dark matter. Physics Letters B, 755. pp. 371-379. ISSN 0370-2693

[img] PDF - Published Version
Available under License Creative Commons Attribution.

Download (1MB)

Abstract

We consider the possibility of interpreting the recently reported diphoton excess at 750GeV as a spin-two massive particle (such as a Kaluza–Klein graviton in warped extra-dimensions) which serves as a mediator to Dark Matter via its gravitational couplings to the dark sector and to the Standard Model (SM). We model non-universal couplings of the resonance to gauge bosons in the SM and to Dark Matter as a function on their localization in the extra dimension. We find that scalar, fermion or vector dark matter can saturate the dark matter relic density by the annihilation of dark matter into a pair of the SM particles or heavy resonances, in agreement with the diphoton resonance signal strength. We check the compatibility of our hypothesis with other searches for the KK graviton. We show that the invisible decay rate of the resonance into a pair of dark matter is subdominant in the region of the correct relic density, hence leading to no constraints from the mono-jet bound at 8TeV via the gluon coupling. We also discuss the kinematic features of the decay products of a KK graviton to distinguish the KK graviton from the SM backgrounds or a scalar particle interpretation of the diphoton resonance.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Theoretical Particle Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Billy Wichaidit
Date Deposited: 27 Jul 2017 10:46
Last Modified: 27 Jul 2017 10:53
URI: http://sro.sussex.ac.uk/id/eprint/69487

View download statistics for this item

📧 Request an update
Project NameSussex Project NumberFunderFunder Ref
Particle Physics Theory at Royal Holloway and SussexG0742STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/J000477/1