On the interpretation of a possible ~ 750 GeV particle decaying into γγ
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1326972
- Grant/Contract Number:
- SC0007859
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2016; Journal Issue: 3; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Berlin
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Higgs Physics; Technicolor and Composite Models
Citation Formats
Ellis, John, Ellis, Sebastian A. R., Quevillon, Jeremie, Sanz, Veronica, and You, Tevong. On the interpretation of a possible ~ 750 GeV particle decaying into γγ. United States: N. p., 2016.
Web. doi:10.1007/JHEP03(2016)176.
Ellis, John, Ellis, Sebastian A. R., Quevillon, Jeremie, Sanz, Veronica, & You, Tevong. On the interpretation of a possible ~ 750 GeV particle decaying into γγ. United States. https://doi.org/10.1007/JHEP03(2016)176
Ellis, John, Ellis, Sebastian A. R., Quevillon, Jeremie, Sanz, Veronica, and You, Tevong. Fri .
"On the interpretation of a possible ~ 750 GeV particle decaying into γγ". United States. https://doi.org/10.1007/JHEP03(2016)176. https://www.osti.gov/servlets/purl/1326972.
@article{osti_1326972,
title = {On the interpretation of a possible ~ 750 GeV particle decaying into γγ},
author = {Ellis, John and Ellis, Sebastian A. R. and Quevillon, Jeremie and Sanz, Veronica and You, Tevong},
abstractNote = {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.},
doi = {10.1007/JHEP03(2016)176},
journal = {Journal of High Energy Physics (Online)},
number = 3,
volume = 2016,
place = {United States},
year = {Fri Mar 25 00:00:00 EDT 2016},
month = {Fri Mar 25 00:00:00 EDT 2016}
}
Web of Science
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