Electroweak Vacuum Stability & Diphoton 750 GeV

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Presentation transcript:

Electroweak Vacuum Stability & Diphoton Excess @ 750 GeV Jue Zhang ( 张珏） IHEP, CAS January 7, 2016 JZ and Shun Zhou, arXiv:1512.07889

Outline Paper Excess after Diphton Excess A Simple Model Connection with Electroweak Vacuum Stability Summary

Paper Excess after Diphton Excess

hep-ph arXiv papers (2010 - 2015) Excess Discovered!

Trend of Papers on Diphoton Excess

A Simple Model

SM + a singlet scalar + a VL fermion pair Note: Loop particles can NOT be SM particles only! S dijet search Additional decay mode of S: S Z/γ ZZ / Zγ search Z/γ

Additional Coupling with SM Higgs "Everything not forbidden is compulsory." --T.H.White (borrowed by Gell-Mann) 1. S can mix with SM Higgs! 2. S can decay to SM Higgs!

Diphoton Excess and Other Constraints R. Franceschini et al., arXiv:1512.04933 Note: Width info is NOT used! Other Constraints:

Allowed Parameter Space from LHC A. Falkowski, et al., arXiv:1502.01361 QF = 3 QF = 5

Electroweak Vacuum Stability

SM Electroweak Vacuum Stability Xing, Zhang and Zhou, 1112.3112

Can S Help Stablize EW Vacuum? Vacuum Stable Condition: Subject to constraints: RGE Running: 2-loop SM RGEs 1-loop SM RGEs + New RGEs Check Stability & Perturbativity mZ mS

Allowed Parameter Space from Stability Planck Scale: GUT Scale: NO OVERLAP! Seesaw Scale: Same as SM:

A Closer Look depending on mixing angle θ ! too large yS λS runs towards negative quickly!

More Vector-like Fermions? F1, F2, F3, ...

Deeper Thoughts & More Data are Needed! Summary The community is on fire due to diphoton excess! SM + a singlet scalar + a pair of vector-like fermion Diphoton excess & Electroweak Vacuum Stability (in our set-up) Deeper Thoughts & More Data are Needed! Stay Tuned!