A 750 GeV messenger of dark conformal symmetry breaking [electronic resource]
- Washington, D.C. : United States. Dept. of Energy. High Energy Physics Division ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016
- Physical description
- 1 online resource (p. 1-5 ): digital, PDF file.
- Brookhaven National Laboratory. Researcher
- United States. Dept. of Energy. High Energy Physics Division. Sponsor
- United States. Dept. of Energy. Office of Scientific and Technical Information. Distributor
- Hooman Davoudiasl Author
- Cen Zhang Author
- The tentative hints for a diphoton resonance at a mass of ~750 GeV from the ATLAS and CMS experiments at the LHC may be interpreted as first contact with a “dark” sector with a spontaneously broken conformal symmetry. The implied TeV scale of the dark sector may be motivated by the interaction strength required to accommodate a viable thermal relic dark matter (DM) candidate. We model the conformal dynamics using a Randall-Sundrum-type five-dimensional geometry whose IR boundary is identified with the dynamics of the composite dark sector, while the Standard Model (SM) matter content resides on the UV boundary, corresponding to “elementary” fields. We allow the gauge fields to reside in the five-dimensional bulk, which can be minimally chosen to be SU(3)c×U(1)Y. The “dark” radion is identified as the putative 750 GeV resonance. Heavy vectorlike fermions, often invoked to explain the diphoton excess, are not explicitly present in our model and are not predicted to appear in the spectrum of TeV scale states. Our minimal setup favors scalar DM of O(TeV) mass. A generic expectation in this scenario, suggested by DM considerations, is the appearance of vector bosons at ~ few TeV, corresponding to the gluon and hypercharge Kaluza-Klein (KK) modes that couple to UV boundary states with strengths that are suppressed uniformly compared to their SM values. Furthermore, our analysis suggests that these KK modes could be within the reach of the LHC in the coming years.
- Publication date
- Published through SciTech Connect.
- Physical Review D 93 5 ISSN 2470-0010; PRVDAQ AM
- Hooman Davoudiasl; Cen Zhang.
- Funding Information