Yonsei university Cosmology and High Energy physics workshop (YuCHE 2019)

25 Feb 2019, 17:00 → 27 Feb 2019, 16:00 Asia/Seoul

B102 (Yonsei University)

Yonsei university Cosmology and High Energy physics workshop (YuCHE 2019) 

  We are pleased to announce the 1st Yonsei university international workshop on Cosmology and High Energy physics (YuCHE 2019). The aim of the workshop is to exchange ideas among experts in the related field and foresee the future directions of the research. 

- Date: Feb 25-27, 2019

- Place: Yonsei University, Science building B102

 

LOC - Youngjoon Kwon, Seongchan Park

 

Invited Speakers from abroad

• K. Hamaguchi (Univ. of Tokyo)
• S. Matsumoto (IPMU, Univ. of Tokyo)
• T. Moroi (Univ. of Tokyo)

 

Local Invited Speakers 

• C. S. Shin (IBS, CTPU)
• E. J. Chun (KIAS)
• D. K. Hong (PNU)
• H. M. Lee (CAU)
• J. C. Park (CNU)
• J. Song (Konkuk)
• K. Y. Choi (SKKU)
• K. J. Bae (IBS, CTPU)
• M. H. Park (Seoul Tech.)
• P. Ko (KIAS)
• S. K. Kang (Seoul Tech.)
• S. Jung (SNU)

Monday, 25 February

1 arrival / reception

Travel Guide_Yonsei HEP.pdf

Tuesday, 26 February

2 Opening: Welcome & Intro.

• Welcoming
• Intro to Yonsei U. and Yonsei Physics
• HEP at Yonsei
• Selected recent results from Belle

Speaker: Prof. Y.J Kwon

YuCHE_20190226_yjkwon_v.1.1.pdf

3 Studying Gauginos in Supersymmetric Model at Future 100TeV pp Collider

I discuss a possibility of studying the properties (in particular, masses) of gauginos at future 100TeV pp collider, paying particular attention to the model in which gauginos are withing the kinematical reach while the sfermions and Higgsinos are too heavy to be produced at the collider. I first explain that such a mass spectrum can be naturally realized in a class of model called minimal gravity mediation. Then, I discuss procedures to determine gaugino masses at future 100TeV pp collider. I also comment on the possibility to acquire information about more fundamental parameters, like gravitino mass.

Speaker: Prof. T Moroi

amsbfccYUCHE19.pdf

4 Flavourful axion phenomenology

We provide a comprehensive discussion of the phenomenology of flavourful axions. Presenting the general flavourful axion-fermion and axion-photon coupling, we calculate flavour-violating decays of mesons and leptons involving a flavourful axion. We also derive the mixing between axions and mesons which affects the meson oscillation probability and mass difference, and also contributes to meson decays into axions and axion decays into two photons. These effects may be relevant for ALPs. Finally we describe the phenomenology of a particular "A to Z" Pati-Salam model, in which PQ symmetry arises accidentally due to discrete flavour symmetry. Here all axion couplings are fixed by a fit to flavour data, leading to sharp predictions and correlations between flavour-dependent observables.

Speaker: Prof. E.J Chun

190226-Yonsei-FlavAxion.pdf

5 Constraining DM-neutrino interaction with IceCube-170922A

Speaker: Prof. K.Y Choi

NuDM.pdf

12:00 Lunch

6 Flaxion, Axion and Neutron Star.

Speaker: Prof. K Hamaguchi

201902_YuCHE.pdf

7 Energetic ALPs From Decaying Dark Matter

Speaker: Prof. K.J Bae

YuCHE_190226.pdf

15:30 Break

8 Unitary inflaton as dark matter and radiation

Speaker: Prof. H.M Lee

yonsei2019-hmlee.pdf

9 Dark Matter and WIMPy Baryogenesis in Scotogenic Model

Speaker: Prof. S.K Kang

Yonsei-SKKANG.pdf

10 Murdering the 4th generation 2HDM

Speaker: Prof. J.H Song

Yonsei-190226-Song.pdf

11 A model of light dark baryons and dark radiation

We propose a model for dark matter and dark radiation, based on a strongly-coupled dark SU(5) gauge theory with fundamental and decuplet dark-quarks. The model supports light dark-baryons, respecting the chiral symmetry, which are electrically neutral but have electromagnetic form factors, and also a light dark-axion. Since the coupling of dark baryons to the standard model particles is inversely proportional to the square of the confinement scale, dark baryons become either hot dark matter or cold dark matter, depending on when the dark color confines. For the confinement scale Λ∼10−103 GeV the dark baryons of mass about 1 GeV−1 MeV become cold dark matter with naturally small magnetic moment and give the correct relic abundance.

Speaker: Prof. D.K Hong

hong_yonsei_talk.pdf

18:00 Dinner

12 Pictures

YuCHE2019_Pictures.pdf

Wednesday, 27 February

13 Light Fermionic WIMP Dark Matter with Light Scalar Mediator

A light fermionic weakly interacting massive particle (WIMP) dark matter is investigated by studying its minimal renormalizable model, where it requires a scalar mediator to have an interaction between the WIMP and standard model particles. We perform a comprehensive likelihood analysis of the model involving all robust constraints obtained so far and that will be obtained in the near future with paying particular attention to properly take the kinematically equilibrium condition into account. It is shown that near-future experiments and observations such as low-mass direct dark matter detections, flavor experiments and CMB observations play important roles to test the model; however, wide parameter region will still remain survived even if no WIMP and mediator signals are detected there. We also show that precise Higgs boson measurements at future lepton colliders will play a significant role to test this remaining region.

Speaker: Prof. S Matsumoto

Matsumoto_YuCHE.pdf

14 Precision Higgs at the LHC

Speaker: Prof. M.H Park

PARK_PDF.pdf

15 Probing Dark Matter at LIGO and Beyond

What can we learn about Dark Matter frontier with Gravitational-Wave (GW) observations at LIGO and future detectors?

We first introduce a new GW observable — GW Fringe — that allows LIGO alone to already probe compact dark matter. We further show that the dark-matter physics potential of GW observation is significantly widened and increased by augmenting LIGO with mid-frequency detectors. New opportunities include searches of fuzzy axion-like dark matter and cosmic strings as well as an ideal localization as a bonus.

Speaker: Prof. S.H Jung

DMatLIGO-Yonsei.pdf

12:00 Lunch

16 Electroweak baryogengesis driven by an axion like particle.

An axion-like particle (ALP) offers a new direction in electroweak baryogenesis because the periodic nature enables it to trigger a strong first-order phase transition even if it is weakly coupled to the Higgs sector. This is essentially because the axion periodicity naturally allows the structure of phase transition to be insensitive to the axion decay constant that determines the strength of axion interactions. Furthermore, the axion can serve as a CP phase relevant to electroweak baryogenesis without causing any problem with respect to the recent measurement of an electron EDM. Depending on the scale of f, non-local or local generation of baryon asymmetry scenarios can be realized. In this talk, I will introduce the basic set-up of the axionic electroweak baryogenesis, and discuss allowed parameter ranges of the axion mass and the implications for future ALP studies.

Speaker: Prof. C.S Shin

aEWBG_CSS_0227.pdf

17 Boosted Dark Matter and its Search

Can dark matter be produced and travel with relativistic velocities in the current universe?
We answer this question and provide new detection strategies of such relativistic dark matter.

Speaker: Prof. J.C Park

BDM-Search_YuCHE2019_JCPark.pdf

18 S8

Speaker: Prof. P Ko

yuche2019_pko.pdf

19 Closing

Speaker: Prof. S.C Park

closing_YuCHE.pdf