Confronting dark matter with the diphoton excess from a parent resonance decay

The European Physical Journal C

Roberto Ruiz de Austri¹  Jong Soo Kim²  Víctor Martín-Lozano³  Valentina De Romeri³  Krzysztof Rolbiecki⁴ 

[1] Instituto de Física Corpuscular, IFIC/CSIC, Valencia, Spain;Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain;Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain;Departamento de Física Teórica, Universidad Autónoma de Madrid, 28049, Madrid, Spain;Instituto de Física Teórica UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain;Institute of Theoretical Physics, University of Warsaw, 02093, Warsaw, Poland;

关键词: Dark Matter;    Dark Matter Candidate;    Annihilation Cross Section;    Weakly Interact Massive Particle;    Dark Matter Annihilation;   

DOI  :  10.1140/epjc/s10052-016-4116-7

来源: Springer

【 摘 要 】

A diphoton excess with an invariant mass of about 750 GeV has been recently reported by both ATLAS and CMS experiments at LHC. While the simplest interpretation requires the resonant production of a 750 GeV (pseudo)scalar, here we consider an alternative setup, with an additional heavy parent particle which decays into a pair of 750 GeV resonances. This configuration improves the agreement between the 8 and 13 TeV data. Moreover, we include a dark matter candidate in the form of a Majorana fermion which interacts through the 750 GeV portal. The invisible decays of the light resonance help to suppress additional decay channels into Standard Model particles in association with the diphoton signal. We realise our hierarchical framework in the context of an effective theory, and we analyse the diphoton signal as well as the consistency with other LHC searches. We finally address the interplay of the LHC results with the dark matter phenomenology, namely the compatibility with the relic density abundance and the indirect detection bounds.

【 授权许可】

CC BY