Sunghoon Jung (정성훈)

   Department of Physics and Astronomy, Center for Theoretical Physics,
    Seoul National University

    sunghoonj at ,   nejsh21 at
My research is on theoretical particle physics phenomenology, primarily on understanding the fundamental Nature beyond the Standard Model, from collider, gravitational-wave, and cosmological experiments/observations.

Research Interests:

My research publication can be found at INSPIRES-HEP, ("ea jung, sunghoon") or at Google Scholar.

0. The Standard Model (SM) of particle physics describes the dynamics of elementary particles -- leptons and quarks that form our body, and photons, gluons, W/Z bosons that mediate fundamental forces. It has been very well established both theoretically and experimentally. But there are also many experimental evidence for new physics beyond the SM (BSM): dark matter, dark energy, the origin of the Higgs, and where the Universe came from. My research aims to understand them and eventually the Universe.

1. Higgs physics:  The long-sought Higgs boson plays a unique role in generating the masses we feel. But the discovery of the Higgs boson is not the end of a story; but it may help us learn about the Universe. What can we learn? 
  - Are we really ready for model-independent Higgs precision analysis?   -- Improved formalism for single-Higgs as well as triple-Higgs couplings.
  - Does (Higgs) particle always appear as a resonance peak?   -- Pure resonance dips, nothingness and (Heavy) Higgs lineshapes, and their impact on collider searches.
  - Coming up soon...
  - Can the SM Higgs potential be originally flat (hence, non-existent) at the Planck scale?   -- Scale invariance with U(1)B-L
  - The Higgs and the Higgsino are necessarily intimate particles.   --  Necessary signals of Future SUSY from the Higgs and Higgsino:
  - The Higgs portal is an inevitable renormalizable interaction.   -- Abelian Higgs sector (Higgs portal and kinetic mixing):
2. Gravitational Waves:  With GW, we can see farther, deeper, and earlier Universe that we haven't observed. In particular, dark matter -- 5 times more than what we see everyday -- can perhaps be seen. What exciting possibilities and phenomena can we see and utilize with GW?
  - LIGO + mid-band has great physics potential for probing dark matter of the Universe. The benefits mainly come from long-time highest-frequency measurements of the broadband (LIGO+mid band) detections.
  - What is the best way to localize GW?   -- Doppler effect around the Sun! Surprisingly, it's not fully appreciated yet. Mid-frequency (0.1-10Hz) is an ideal bandwidth for this.
  - How can GW see DM? Seems unlikely due to coarse resolution and burst-like signals.   -- "GW Lensing Fringe" surprisingly allows us to see DM.
  - Coming up soon...

3. Dark matter:  WIMP miracle is gone. It is becoming harder to see DM. What is it?
  - Very Degenerate Higgsino Dark Matter can lead to unusual but interesting annihilation signals.
  - LIGO lensing is a new way to search for compact DM, which is still viable and interesting DM candidate. 

4. Supersymmetry at (future) colliders:  The absence of SUSY discovery so far at LHC is very disappointing. But it's premature to say SUSY is dead. How can we discover/test "Future SUSY"? 
  - Prospects for Electroweakino and Gluino Discovery at a 100 TeV Hadron Collider:
  - Higgs and Higgsino signals in future SUSY:
  - Can SUSY be discovered through resonances?   --  Stoponium signals.

5. Top quarks:  Why is the top quark as heavy as the electroweak scale? The top quark, which necessarily participates in the electroweak symmetry breaking, is likely to tell us something.
  - Top-pair four-Fermi operators lead to various observables and physic insights from Renormalization Group Evolution. Can you believe RGE can teach us about top Afb?
  - Correlation of Top Asymmetries: Loop Versus Tree Origins   --  We can distinguish different origins.
  - Top Quark Forward-Backward Asymmetry from New t-channel Physics   --  awkward, but awesome.
  - Randall-Sundrum model likes the top quark   --  predilection of top quarks in RS models.

6. Displaced decays of SUSY:  Can SUSY hide behind displaced decays? 
  - Displaced signals are ubiquitous from the Higgsino, Axino, Gravitino, and very light charginos

Link:  SNU CTP/NAPP Seminars are here. (Our regular seminar is on Thursday 4pm at 56-521. If you are interested, please let me know. Anyone is welcome to attend.)

Mini CV:

- 2017 : Assistant Professor at Seoul National University (SNU).
- 2015 : Research Associate at SLAC National Accelerator Laboratory, Stanford University. 
- 2012 : Research Fellow at Korea Institute for Advanced Study (KIAS). (alternative to military service duty as well)
- 2011 : Postdoctoral Researcher at University of Chicago, Enrico Fermi Institute. 
- 2011 : Ph.D at University of Michigan, Ann Arbor, under the supervision of James D. Wells.
- 2006 : BS in physics at Postech (Pohang University of Science and Technology).

Awards and Honors:

- POSCO Science Fellowship 청암포스코사이언스펠로쉽 (2018-19) as a junior faculty
- Samsung Scholarship 삼성장학생 (2006-2010) for top students studying abroad