SU(6) GUT origin of the TeV-scale vectorlike particles associated with the 750 GeV diphoton resonance

Bhaskar Dutta, Yu Gao, Tathagata Ghosh, Ilia Gogoladze, Tianjun Li, and Joel W. Walker
Phys. Rev. D 94, 036006 – Published 22 August 2016

Abstract

We consider the SU(6) grand unified theory (GUT) model as an explanation for the diphoton final state excess, where the masses of all associated particles are linked with a new symmetry breaking scale. In this model, the diphoton final states arise due to loops involving three pairs of new vectorlike particles having the same quantum numbers as down-type quarks and lepton doublets. These new vectorlike fermions are embedded alongside the standard model (SM) fermions into minimal anomaly-free representations of the SU(6) gauge symmetry. The SU(6) symmetry is broken to the standard model times U(1)X at the GUT scale, and masses for the vectorlike fermions arise at the TeV scale only after the residual U(1)X symmetry is broken. The vectorlike fermions do not acquire masses via breaking of the SM symmetry at the electroweak scale. The field which is responsible for the newly observed resonance belongs to the 6¯H representation. The dark matter arises from the SM singlet fermion residing in 6¯ and is of Majorana type. We explicitly demonstrate gauge coupling unification in this model, and also discuss the origin of neutrino masses. In addition to the diphoton final states, we make distinctive predictions for other final states which are likewise accessible to the ongoing LHC experimental effort.

  • Figure
  • Figure
  • Received 20 May 2016

DOI:https://doi.org/10.1103/PhysRevD.94.036006

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Bhaskar Dutta1, Yu Gao1, Tathagata Ghosh1, Ilia Gogoladze2, Tianjun Li3,4,5, and Joel W. Walker6

  • 1Department of Physics and Astronomy, Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA
  • 2Department of Physics and Astronomy, Bartol Research Institute, University of Delaware, Newark, Delaware 19716 USA
  • 3Key Laboratory of Theoretical Physics and Kavli Institute for Theoretical Physics China (KITPC), Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
  • 4School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
  • 5School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China
  • 6Department of Physics, Sam Houston State University, Huntsville, Texas 77341, USA

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 94, Iss. 3 — 1 August 2016

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×