On the interpretation of a possible ~ 750 GeV particle decaying into γγ

Ellis, John; Ellis, Sebastian A. R.; Quevillon, Jeremie; Sanz, Veronica; You, Tevong

doi:10.1007/JHEP03(2016)176

Title: On the interpretation of a possible ~ 750 GeV particle decaying into γγ

Journal Article · Fri Mar 25 00:00:00 EDT 2016 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP03(2016)176· OSTI ID:1326972

Ellis, John ^[1]; Ellis, Sebastian A. R. ^[2]; Quevillon, Jeremie ^[3]; Sanz, Veronica ^[4]; You, Tevong ^[5]

King's College London, London (United Kingdom); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
Univ. of Michigan, Ann Arbor, MI (United States)
King's College London, London (United Kingdom)
Univ. of Sussex, Brighton (United Kingdom)
Univ. of Cambridge, Cambridge (United Kingdom)

We consider interpretations of the recent ~3σ reports by the CMS and ATLAS collaborations of a possible X(~ 750 GeV) state decaying into yy final states. We focus on the possibilities that this is a scalar or pseudoscalar electroweak isoscalar state produced by gluon-gluon fusion mediated by loops of heavy fermions. We consider several models for these fermions, including a single vector-like charge 2/3 T quark, a doublet of vector-like quarks (T;B), and a vector-like generation of quarks, with or without leptons that also contribute to the X → yy decay amplitude. We also consider the possibility that X(750) is a dark matter mediator, with a neutral vector-like dark matter particle. These scenarios are compatible with the present and prospective direct limits on vector-like fermions from LHC Runs 1 and 2, as well as indirect constraints from electroweak precision measurements, and we show that the required Yukawa-like couplings between the X particle and the heavy vector-like fermions are small enough to be perturbative so long as the X particle has dominant decay modes into gg and yy. In conclusion, the decays X → ZZ,Zy and W⁺W^- are interesting prospective signatures that may help distinguish between different vector-like fermion scenarios.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0007859

OSTI ID:: 1326972

Journal Information:: Journal of High Energy Physics (Online), Vol. 2016, Issue 3; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 105 works

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