The 2nd Asian-European-Institutes (AEI) Workshop for BSM and the 10th KIAS Workshop on Particle Physics and Cosmology

13 Nov 2022, 15:00 → 18 Nov 2022, 14:00 Asia/Seoul

The Grand Sumorum, Jeju

Eung Jin Chun (Korea Institute for Advanced Study), Tomasz Dutka (Korea Institute for Advanced Study), Jongkuk Kim (KIAS), Pyungwon Ko (KIAS), Jae-hyeon Park (Korea Institute for Advanced Study), Myeonghun Park (Seoultech)

The 2nd “Asian-European-Institutes Workshop for BSM” will be held jointly with the 10th "KIAS Workshop on Particle Physics and Cosmology". This will be the first event in the series since the start of the COVID-19 pandemic.

The aim of this meeting is to gather theorists from participating institutes together to share their current research related to particle physics and cosmology, with a particular focus on BSM. Additionally, a number of overview talks from invited speakers have been organised to outline, and provide updates to, some broad classes of theoretical models. This joint workshop will provide opportunities for collaboration between researchers from different institutes, and help young researchers better promote themselves in the community. 

The event will be held at The Grand Sumorum, Jeju Island between Nov. 13-18, 2022 (ending after lunch on the Friday).

Invited Speakers

AEI Workshop:

• Josh Eby (Kavli IPMU)
• Christoph Englert (Glasgow U.)
• Jason L. Evans* (T.D. Lee Institute, SJTU)
• Sungwoo Hong (U. Chicago, KAIST)
• Rachel Houtz (IPPP, Durham)
• Valya Khoze (IPPP, Durham)
• Jeong Han Kim (CBNU)
• Frank Krauss (IPPP, Durham)
• Hye-Sung Lee (KAIST)
• Shu Li* (T.D. Lee Institute, SJTU)
• Kyohei Mukaida* (KEK)
• Myeonghun Park (Seoultech, KIAS)
• Lauren Pearce* (Penn State U, New Kensington)
• Satoshi Shirai (Kavli IPMU)
• Minho Son (KAIST)
• Yufeng Wang* (T.D. Lee Institute, SJTU)
• Zhi-Peng Xing* (T.D. Lee Institute, SJTU)
• Ning Zhou* (SJTU)

KIAS Workshop:

• Priyotosh Bandyopadhyay (Indian Inst. Tech., Hyderabad)
• Sang Hui Im (IBS-CTPU)
• Chulwoo Jung (BNL)
• Hyun Min Lee (CAU)
• Seong Chan Park (Yonsei)
• Wan-Il Park (JBNU)
• Seodong Shin (JBNU)
• Jeonghyeon Song (Konkuk)

 

* Indicates an online talk.

Important notices:

- Deadline - Abstract submission: Oct. 23, 23:00, 2022 (KST).

- A number of rooms at the workshop hotel have been booked in preparation for the joint workshop.

Invited speakers will have their accommodation (including breakfast) covered by the workshop. Others who also wish to stay at the same hotel can find details of the costs on the registration page.

- Lunch and dinner will be provided gratis to invited speakers. Otherwise, a registration fee of 250,000 KRW for domestic participants, or 180 USD for foreigners will be charged to those who wish to attend the organised lunches and dinners (with the invited speakers). If you plan to explore the local restaurants yourself, you do not need to pay the registration fee.

- For those in need of financial support: please indicate this on the registration form. There are some limited funds for speakers with insufficient budgets.

Group photo

Sunday 13 November

Registration

18:00 Reception

Monday 14 November

Morning Session

Convener: Eung Jin Chun (Korea Institute for Advanced Study)

1 QCD instantons at hadron colliders

TBA

Speaker: Valentin Khoze (IPPP)

Khoze_Jeju_2022.pdf

2 Models for self-resonant dark matter

We consider a new mechanism for enhancing the self-scattering and
annihilation cross sections for dark matter with multiple components but without a
light mediator. The lighter dark matter component plays a role of the u-channel
pole in the elastic co-scattering for dark matter, leading to a large self-scattering
cross section and a Sommerfeld enhancement for semi-annihilation processes.
Taking the effective theory approach for self-resonant dark matter, we classify
multiple dark matter components with spins and parities, showing a u-channel pole
in the co-scattering processes. We introduce dark photon and dark Higgs portals
and microscopic models for realistic self-resonant dark matter and discuss various
observational consequences.

Speaker: Hyun Min Lee (CAU)

KIAS2022-hmlee.pdf

3 TBA

TBA

Speaker: Wan-Il Park (JBNU)

10:30 Break

Morning Session

Convener: Hyun Min Lee (CAU - Chung-Ang University (KR))

4 Mediator Decays at Thresholds

We study the decay processes of mediator particles, which are predicted
in the light dark matter scenario, especially for the case in which their masses lie
near the threshold region. We consider a vector mediator particle as an example,
whose mass is around twice the muon or the bottom quark mass. We develop a
method to quantitatively deal with the threshold singularity of the decay processes.
We found that for the mass of the mediator being above the threshold, the decay
width is enhanced by the so-called Sommerfeld effect. On the other hand, for the
mass below the threshold, the decay width is also enhanced due to the mixing
between the mediator and the bound states of the final state particles.

Speaker: Shigeki Matsumoto (Kavli IPMU, U. Tokyo)

MD@T.pdf

5 Subfrequency light signals of the dark sector

TBA

Speaker: Hye-Sung Lee (KAIST)

Subfrequency signals (AEI workshop 2022).pdf

6 Axion Quality Problem and its solution

TBA

Speaker: Seong Chan Park (Yonsei U)

scpark.pdf

12:30 Lunch

Afternoon Session

Convener: Hye-Sung Lee (KAIST)

7 Sensitivities to secret neutrino interaction at meson decay and short baseline neutrino experiments

We study the impact of the coupling of neutrinos with a new light neutral
gauge boson, Z′, with a mass of less than 500 {\rm MeV} in meson decay and short
baseline neutrino experiments experiments.

Speaker: Pouya Bakhti (JBNU)

Slides

8 Non-Standard Interaction of atmospheric neutrino in future experiments

We discuss the prospects of probing neutral-current non-standard
interaction (NSI) in the propagation of atmospheric neutrinos in future large-volume
neutrino experiments including DUNE, HK, KNO, and ORCA. Based on our
simulated results, the ten years of data taking of the atmospheric neutrinos can
enormously improve the bounds on the related NSI parameters by a couple of
orders of magnitudes. In addition, we show the expected correlations between the
CP-violation phase $\delta_{CP}$ and the related NSI parameters and confirm the
potentials of DUNE, HK, KNO (combined with HK) in excluding the ``No CP
violation" hypothesis at 1$\sigma$, 2$\sigma$, and 3$\sigma$, respectively.

Speaker: Meshkat Rajaee (JBNU)

Slides

9 Testing electroweak scale seesaw models at $e^-\gamma$ and $\gamma\gamma$ collisions

We investigate electroweak scale seesaw scenarios such as type-I, II
and III seesaw in the context of $e^-\gamma$ and $\gamma\gamma$ colliders.
The heavy neutrinos~(triplet fermions) can be produced at $e^-\gamma$ colliders
in association with a W boson. We study LNV final state such as $e^{+} + 4j$
where the associated W boson decay hadronically. We also consider the leptonic
decay of the W boson giving rise to the same sign dilepton signal in association
with jets and missing momentum. Studying these signals and generic backgrounds
we estimate bounds on the light-heavy neutrino mixing angle from the
$e^-\gamma$ collider which can provide stronger limits than the existing ones,
atleast for relatively higher mass of heavy neutrinos. In case of type-II seesaw
singly and doubly charged multiplets of the SU(2)L triplet scalar can be produced
at $e^-\gamma$ and $\gamma\gamma$ colliders respectively. We study the
leptonic decay modes of the charged multiplets which depend on the
corresponding Yukawa coupling with the lepton doublet involving the light neutrino
mass. We find that one can easily distinguish between neutrino mass hierarchy
using these final states.

Speaker: Sanjoy Mandal (KIAS)

Jeju.pdf

10 Displaced Decay Signatures in Probing Seesaw

Seesaw mechanisms are well motivated in explaining the tiny neutrino
mass. We investigate the displaced vertex signatures at the LHC/FCC and muon
colliders for Type-III and Type-I Seesaw scenarios, where we expect the heavy
charged or neutral fermions to be displaced depending on their Yukawa couplings
and masses. A very small Yukawa coupling can lead to two successive displaced
decays in case of Type-III scenario. The prospects of the transverse and
longitudinal displaced decay lengths are extensively studied in the context of the
boost at the LHC/FCC and muon collider. In the case of the LHC/FCC, a detailed
PYTHIA based simulation is performed to determine the parameter regions that
are sensitive to CMS, ATLAS and MATHUSLA detectors at the centre of mass
energies of 14, 27 and 100 TeV via displaced signatures. Similarly a futuristic
study has been performed for the Type-III Seesaw at the muon collider with the
centre of mass energies of 3.5, 14 and 30 TeV.

Speaker: Chandrima Sen (Indian Institute of Technology Hyderabad)

Chandrima_JejuConf.pdf

11 Nucleon Decay and (Low-Scale) Pati-Salam

The gauge bosons of Pati–Salam do not mediate proton decay at the renormalisable level, and for this reason it is possible to construct scenarios in which SU(4) ⊗ SU(2)R is broken at relatively low scales. Such low-scale models, however, appear to generate dimension-5 operators that can give rise to nucleon decays at unacceptably large rates, even if the operators are suppressed by the Planck scale. This suggests a serious difficulty in constructing consistent models of Pati-Salam with low scale PS breaking.

Speaker: Tomasz Dutka (Korea Institute for Advanced Study)

AEI-Workshop_Dutka_v2.pdf

15:40 Break

Afternoon Session

Convener: Minho Son (KAIST)

12 An interplay between composite Dirac neutrinos and the QCD axion

We consider a chiral gauge theory from which light composite Dirac
neutrinos dynamically emerge, augmented by a QCD axion to solve the strong CP
problem. We show that an interplay between the composite sector and the axion
can also simultaneously lead to successful baryogenesis and generate a correct
dark matter abundance via “co-genesis” without contradicting present constraints.
We predict ∆Neff ≥ 0.14 and m_a in the range O(10) µeV–O(10) meV, which can
be firmly tested by upcoming CMB experiments and axion searches.

Speaker: Tae Hyun Jung (KIAS)

composite_axiogenesis_short.pdf

13 CP violation in gauged U(1)

Recently ATLAS provided the constraint in an analysis of the Zjj channel
which interprets measurements of dimension six CP-violating operators in SM
effective field theory. If confirmed, this may be a signal of new CP violation beyond
the Kobayashi-Maskawa phase in the SM. Then it would be an important and
urgent question whether this new CP violation can explain the baryon asymmetry
of the Universe by electroweak baryogenesis. We discuss a model which has
CP-violating interactions at the electroweak scale.

Speaker: Toshinori Matsui (KIAS)

221114KIAS_matsui.pdf

14 A Global Analysis of Resonance-enhanced Light Scalar Dark Matter

We study a minimal model for a light scalar dark matter, requiring a light
scalar mediator to address the core-cusp problem and interact with the standard
model particles. We analyze the model comprehensively by focusing on the
Breit-Wigner resonance for dark matter annihilation and self-scattering channels,
considering the thermal relic abundance condition that includes the early kinetic
decoupling effect, as well as the present and future constraints from collider, direct,
and indirect dark matter detections. We found that the scalar dark matter with the
mass of 0.3 - 2 GeV remains uncharted, which will be efficiently tested by the near
future MeV gamma-ray observations.

Speaker: Yu Watanabe (University of Tokyo)

watanabe_slide.pdf

15 Complex Singlet Benchmarks at Future Collider Experiments

We present benchmark parameters for the general complex scalar
singlet model. The complex scalar singlet extension has three massive scalar
states with interesting decay chains which will depend on the exact mass hierarchy
of the system. We find maximum production rates for resonant double Standard
Model-like Higgs production, resonant production of a Standard Model-like Higgs
and a new scalar, and double resonant new scalar production.

Speaker: Samuel Lane (KAIST)

jejuBSM2022.pdf

18:00 Dinner

Tuesday 15 November

Morning Session

Convener: Shigeki Matsumoto (Kavli IPMU, U. Tokyo)

16 Precision Collider Phenomenology

TBA

Speaker: Frank Krauss (IPPP)

Korea22.pdf

17 TBA

TBA

Speaker: Minho Son (KAIST)

18 cold electroweak baryogenesis through halo collapse

I will present a very simple scenario where a Yukawa interaction causes
metastable halos to form in the early Universe. When the halo collapses a fireball
results with a temperature above that of the electroweak symmetry breaking scale.
This fireball is functionally similar to an electroweak bubble, except the inside is
where sphalerons are unsupressed. I then give a concrete scenario where the
baryon asymmetry can be produced.

Speaker: Graham White (IPMU)

10:30 Break

Morning Session

Convener: Seong Chan Park (Yonsei University)

19 Axion Solar Halos: From Earth and Space

TBA

Speaker: Joshua Eby (Kavli IPMU)

20 Neutrinos and Non-Invertible Symmetry

The notion of symmetries has been generalized rather drastically in
recent years. These generalized global symmetries have shown to be extremely
powerful in deepening our understanding of QFT. The appearance and usage of
generalized global symmetries in particle physics are yet to be explored and this
talk will provide one such story. In this talk, I will show that the SM supplemented
with an extra unbroken U(1) gauge group can possess an non-invertible global
symmetry and this new symmetry can protect the neutrino mass operator from
being generated. An exponentially small neutrino mass can then be induced by a
non-perturbative violation of non-invertible symmetry by UV monopoles. I will
discuss two theories, one of which has Dirac neutrino masses, and the other
Majorana masses. If time permits, TeV-scale phenomenology will be discussed.

Speaker: Sungwoo Hong (KAIST)

21 TBA

TBA

Speaker: Shu Li (TDLI & SJTU)

12:30 Lunch

Discussion & Collaboration

Afternoon Session

Convener: Wan-Il Park (JBNU)

22 All the covariant tensor currents of massless particles in the covariant formulation

We present an efficient algorithm for constructing all the covariant tensor
currents of massless particles of arbitrary spins in the covariant formulation. This
algorithm enables us to extract directly the field theoretical current structures from
their three-point vertices and to find clearly the in-out matrix elements in the
lightlike limit. We revisit the closely-related two restrictions on massless particles
called the Landau-Yang (LY) and Weinberg-Witten (WW) theorems in terms of
arbitrary spins. We find the covariance conditions on form factors leading to the
corresponding tensor currents being covariant and verify that the continuity
assumption of matrix elements taken for obtaining the WW theorem in the original
paper is correct at least in quantum field theory involving conventional fields.

Speaker: Jae Hoon Jeong (KIAS)

2022_jae_hoon_jeong.pdf

23 Some updates on swampland phenomenology

I am planning to pick up some topics from recent developments in
swampland conjectures and their potential applications to phenomenology.

Speaker: Masahito Yamazaki (Kavli IPMU)

20221115_Jeju_AEI_workshop.pdf

24 Detectable Gravitational Waves from Preheating and Particle Physics Phenomenology

Using the results of lattice simulation, we show that preheating can
generate low-frequency Gravitational Waves (GWs) to be detectable within the
future GWs detectors such as BBO, DECIGO, PTA, AION-MAGIS, and CE (in MeV
- TeV ranges). We show that these stochastic GWs signals can act as a novel
probe for various Particle Physics Phenomenology in the Early Universe, such as
the origin of Dark Matter and the production of matter-antimatter asymmetry.

Speaker: Pankaj Saha (Seoultech)

Slides

18:00 Dinner

Wednesday 16 November

Morning Session

Convener: Valentin Khoze (IPPP Durham University)

25 Anatomy of "Jet Classification using Deep Learning"

Speaker: Mihoko Nojiri (KEK)

Keynote slides

PDF slides

26 Axion dark matter with thermal friction

Cosmological evolution of the axion field in the early universe might be significantly affected by thermal friction induced by the axion coupling to the thermalized hidden sector. We examine the effects of such a thermal friction on axion dark matter density and its perturbation when the thermal friction dominates over the Hubble friction. We show that in the presence of sizable thermal friction there can be an exponential decay phase of the axion field before the oscillation phase, during which the axion energy density is efficiently dissipated into a hidden thermal bath. Consequently, the previously excluded parameter region due to overclosing relic axion density becomes cosmologically viable with thermal friction. In particular, a QCD axion much lighter than μeV is viable without tuning the initial misalignment angle. We also find that thermal friction can affect the density perturbation of axion dark matter in various ways. For instance, it can alleviate the large-scale isocurvature bound on axion dark matter in the pre-inflationary PQ breaking scenario, which would make the pre-inflationary axion dark matter compatible with high scale inflation over a wide range of model parameters. In the post-inflationary PQ breaking scenario, thermal friction can also significantly change the scaling behavior of axionic strings, and therefore the typical size of the resultant axion miniclusters.

Speaker: Sang Hui Im (IBS-CTPU)

Slides

27 DarkSHINE: Dark photon fixed-target search experiment at SHINE facility

TBA

Speaker: Yufeng Wang (TDLI)

AEI_DarkSHINE_20221116.pdf

10:30 Break

Morning Session

Convener: Satoshi Shirai (Kavli IPMU)

28 Top quarks as a window to new physics

Speaker: Christoph Englert (University of Glasgow)

2022_Jeju.pdf

29 Leveraging Quantum Annealer to identify event topologies at High energy colliders

Speaker: Myeonghun Park (Seoultech)

PARC_JEJU.pdf

30 W boson mass anomaly and grand unification

It is known that the recently reported shift of the W boson mass can be
easily explained by an SU(2)L triplet Higgs boson with a zero hypercharge if it
obtains a vacuum expectation value (VEV) of O(1) GeV. Surprisingly, the addition
of a TeV scale complex triplet Higgs boson to the standard model (SM) leads to a
precise unification of the gauge couplings at around 10^{14} GeV. We consider
that it is a consequence of SU(5) grand unification and show a possible potential
for the Higgs fields yielding a weak scale complex SU(2) triplet scalar boson.
Although it seems the proton decay constraint would doom such a low-scale
unification, we show that the constraint can be avoided by introducing vector-like
fermions which mix with the SM fermions through mass terms involving the VEV of
th GUT breaking Higgs field. Importantly, the simplest viable model only requires
the addition of one pair of vector-like fermions transforming 10 and 10.

Speaker: Jason Evans (TDLI)

MWmassShiftTalk.pdf

12:30 Lunch

Excursion

18:00 Banquet

Thursday 17 November

Morning Session

Convener: Frank Krauss (IPPP Durham)

31 On Detection of Axion Dark Matter

The axion is one of the most promising dark matter candidates. Since
the axion is a very light particle, its quantum effects are very strong. For example,
the interaction between the axion dark matter and detectors is subject to large
corrections due to coherence effects and stimulated emission effects. In this talk I
will discuss how these quantum effects affect the direct detection of the axion dark
matter.

Speaker: Satoshi Shirai (Kavli IPMU)

shirai.pdf

32 Imprints of Heavy Inflationary Particles on the Large Scale Structure

The early universe had such an extremely high energy density that
supermassive particles could have been produced. When heavy particles are pair
produced during inflation via couplings to the inflaton, the particle mass generates
a non-trivial curvature perturbation in position space. Even if the heavy particles no
longer exist, the modified curvature perturbations are preserved before horizon
re-entry and will generate locally-enhanced dark matter clumps or galaxy densities
on the large-scale structure. We explore these signatures by studying the matter
power spectrum and the abundance of massive halos, and discuss the discovery
potential. We will go through the details of implementing the curvature
perturbations in the N-body simulations with appropriately modifying initial
conditions, and talk about several subtleties that we are currently coping with. It will
allow us to properly include non-linear effects, and investigate a pairwise nature of
signals which is difficult to study analytically. Finally, I will briefly introduce other
interesting literatures that explore early universe models with using N-body
simulations, and their general aspects.

Speaker: Jeong Han Kim (Chungbuk National University)

Slide_Jeong_Han_Kim

33 SU(3) symmetry and its breaking effects in charm baryon decays

We utilize the flavor SU(3) symmetry analysis on the semi-leptonic
decays of anti-triplet charmed baryons($\Lambda^{+}_{c},\Xi_{c}^{+,0}$) to obtain
the results of $\Xi_{c}$ branching fraction:
$\mathcal{B}(\Xi_c^0\to\Xi^-e^+\nu)=4.10\pm0.46\%$,
$\mathcal{B}(\Xi_c^0\to\Xi^-\mu^+\nu_{\mu})=3.98\pm0.57\%$ and find a heavy
deviation between the results of a process $\Xi_c^0\to\Xi^-l^+\nu$ :
$\mathcal{B}(\Xi_c^0\to\Xi^-e^+\nu)=1.31(04\pm07\pm38)\%$,
$\mathcal{B}(\Xi_c^0\to\Xi^-\mu^+\nu_{\mu})=1.27(06\pm10\pm 37)\%$ reported
by Belle Collaboration and SU(3) flavor analysis. In this work, the contributions of
vector and axial-vector currents in the semi-leptonic decay process of anti-triplet
heavy baryons are considered and we respectively analyze their SU(3) symmetry
breaking degrees to illustrate the big discrepancy between experimental data and
SU(3) symmetry analysis. Recently Belle-II collaboration reported new
measurements for the branching ratios for $\mathcal{B}(\Xi_c^0\to\Lambda K^0_S)$, $\mathcal{B}(\Xi_c^0\to\Sigma^0 K^0_S)$ and
$\mathcal{B}(\Xi_c^0\to\Sigma^+ K^-)$. Combined with other known data on
charmless two body decays of an anti-triplet charmed baryon, a lot of information
can be derived with the assistance of flavor $SU(3)$ symmetry. Using $SU(3)$
relations between different decay modes, we find that the new Belle-II data would
predict $\mathcal{B}(\Xi_{c}^{0}\to p \pi^{-})=(5.817\pm1.79)\%$,
$\mathcal{B}(\Xi_{c}^{0}\to p K^{-})=\mathcal{B}(\Xi_{c}^{0}\to \Sigma^{+} \pi^{-})=(1.113\pm0.349)\times 10^{-4}$ which can be tested in the future. Earlier
data show that $\Xi^0_c \to \Xi^- K^+$ decays is violated at 2$\sigma$ level which
casts duolt on the validity of $SU(3)$ symmetry. More careful analysis should be
carried out. To this end, we find that with the new Bell-II data, a global fit to data is
now possible if the $SU(3)$ irreducible amplitudes are all real. We find a resonable
$\chi^2/d.o.f=1.24$ and the deviation for the $\Xi^0_c \to \Xi^- K^+$ is reduced to
within 1$\sigma$ level. We give several comments on the feature of global fit. As a
prediction, we predict the unknown branching ratios and asymmetry parameters of
anti-triplet charmed baryon for charmless two body decays, which are accessible
to the experiments at Belle, BES and LHCb.

Speaker: Zhi-Peng Xing (TDLI)

su3.pdf

10:30 Break

Morning Session

Convener: Jeonghyeon Song (Konkuk University)

34 Interplay of Higgs Boson, Dark matter and Neutrinos

We will discuss the various possibilities of beyond Standard Model
scenarios involving Type-I seesaw and Inverse seesaw mechanism. The B-L
gauge extension with a scalar dark matter scenario can have displaced decay
signature while the dark matter freeze-out is via right-handed neutrino pair. The
Type-X 2HDM is motivated to explain the muon (g-2) excess, if associated with the
right-handed neutrinos, can lead to a new decay mode of charged Higgs decaying
to charged lepton and the right-handed neutrino. A Type-I seesaw extension with
one more Majorana fermion and singlet scalar can lead to loop induced dark
matter-Higgs coupling and also gives rise to interesting phenomenology for the
freeze-out and freeze-in scenarios.

Speaker: Priyotosh Bandyopadhyay (Indian Institute of Technology Hyderabad)

talkJeju.key

talkJejuV2.pdf

35 Discrete Goldstone Bosons

In this talk, I will discuss discrete Goldstone bosons
(dGB's), light particles arising from spontaneously broken exact discrete
symmetries. These dGB's are guaranteed to have nonzero masses, while the
associated discrete symmetry protects them from quadratically divergent mass
contributions. The nonzero masses of dGB's arise directly from the discrete
symmetry, without requiring an explicit symmetry breaking mechanism, setting
dGB's apart from other pseudo-Goldstone bosons. After explaining the mass
protection mechanism, I will discuss the generic experimental signals of dGB's.
Below the spontaneous symmetry breaking scale, typically a preserved subset of
the discrete symmetry remains, leading to a telltale signal of degenerate dGB's
being produced simultaneously. Moreover, ratios of multi-scalar production
amplitudes give a probe of the full UV discrete symmetry.

Speaker: Rachel Houtz (IPPP)

dGB_AEIworkshop_Houtz.pdf

36 TBA

TBA

Speaker: Kyohei Mukaida (KEK)

lfg_kmukaida.pdf

12:30 Lunch

Discussion & Collaboration

Afternoon Session

Convener: Seodong Shin (JBNU)

37 Riemannian Data preprocessing in Machine Learning to focus on QCD color structure

Identifying the quantum chromodynamics (QCD) color structure of
processes provides additional information to enhance the reach for new physics
searches at the Large Hadron Collider (LHC). Analyses of QCD color structure in
the decay process of a boosted particle have been spotted as information
becomes well localized in the limited phase space. While these kind of a boosted
jet analyses provide an efficient way to identify a color structure, the constrained
phase space reduces the number of available data, resulting in a low significance.
In this letter, we provide a simple but a novel data preprocessing method using a
Riemann sphere to utilize a full phase space by de-correlating QCD structure from
a kinematics. We can achieve a statistical stability by enlarging the size of testable
data set with focusing on QCD structure effectively. We demonstrate the power of
our method at the finite statistics of the LHC Run 2. Our method is complementary
to conventional boosted jet analyses in utilizing QCD information over the wide
range of a phase space.

Speaker: Ahmed Hammad (Seoultech)

Slides

38 Exploring extended Higgs sectors via pair production at the LHC

Higgs sectors extended by electroweakly charged scalars can be
explored by scalar pair production at the LHC. We consider a fermiophobic
scenario, with decays into a pair of gauge bosons, and a fermiophilic one, with
decays into top and bottom quarks. After establishing the current bounds on
simplified models, we discuss current bounds on various composite Higgs models,
as well as potential discovery channels and search strategies for them.

Speaker: Thomas Flacke (KIAS)

Flacke2211Jeju.pdf

39 Exploration of Parameter Spaces Assisted by Machine Learning

We demonstrate two sampling procedures assisted by machine learning
models via regression and classification. The methods described can be used for
different types of analysis on parameters spaces such as finding bounds and
accumulating samples on areas of interest.

Speaker: Raymundo Ramos (Seoultech)

Ramos-slides.pdf

18:00 Dinner

Friday 18 November

Morning Session

Convener: Myeonghun Park (Seoultech)

40 A Large N expansion for Minimum Bias

Despite being the overwhelming majority of events produced in hadron or heavy ion collisions, minimum bias events do not enjoy a robust first-principles theoretical description as their dynamics are dominated by low-energy quantum chromodynamics. I will present a novel expansion scheme of the cross section for minimum bias events that exploits an ergodic hypothesis for particles in the events, and events in an ensemble of data. The expansion parameter that is identified is the number of detected particles, N. This approach enables unified treatment of small and large system collective behaviour, for instance being equally applicable to collective behaviour in heavy ion collisions and pp collisions.

Speaker: Tom Melia (IPMU)

minbias.pdf

41 Hidden dynamics of a sub-component dark matter

In multi-component dark matter scenarios, dynamics of a
sub-component dark matter has been often ignored. In this talk, I will be pointing
out the hidden roles of a sub-component dark matter in the scenarios where the
dominant relics interact with the Standard Model sector only indirectly through the
sub-component. Distinctive cosmological dynamics of a sub-component dark
matter will be discussed. The thermal evolution of the sub-component is
significantly affected by the sizable self-scattering and the required annihilation
cross section of the sub-component sharply increases as we consider a smaller
relative abundance fraction among the dark-matter species. Therefore, contrary to
a naive expectation, it can be easier to detect the sub-component with smaller
abundance fractions in direct/indirect-detection experiments and cosmological
observations.

Speaker: Seodong Shin (JBNU)

AEI-KIAS-Shin.pdf

42 Latest results of PandaX-4T experiment

TBA

Speaker: Ning Zhou (SJTU)

20221118_KIAS_PandaX.pdf

10:30 Break

Morning Session

Convener: Pyungwon Ko (KIAS)

43 Higgs Balls: Novel Non-Topological Solitons via Thermal Corrections

Global non-topological solitons (Q-balls) exist when the potential of a
charged scalar field grows slower than quadratically. At zero temperature, this
requires attractive interactions. However, this is not necessary at finite
temperature, as the cubic term ~ T |phi|^3 generically has a negative coefficient.
As a result, non-topological solitons exist at finite temperature in a variety of
models which do not have non-topological solitons at zero temperature. To
illustrate this, we focus on the Higgs boson (both in the Standard Model and in
extensions), which requires generalizing our results to gauged Q-balls.

Speaker: Lauren Pearce (Penn State University-New Kensington)

Hballs_Talk.pdf

44 RGE studies in the two-Higgs-doublet model

The two-Higgs-doublet model is one of the most studied BSM models.
The famous four types in the normal and inverted Higgs scenarios have different
still-allowed parameter spaces, which satisfy the theoretical requirements and the
experimental constraints at the electroweak scale. The high energy scale behavior
through the renormalization group equation analysis yields the cutoff scale of the
model. We will present the high-scale impact on the model parameters as well as a
new way to disentangle the high and low cutoff scales.

Speaker: Jeonghyeon Song (Konkuk University)

221118-KIAS-Jeju-Song.pdf

45 The muon g-2 on the lattice QCD

TBA

Speaker: Chulwoo Jung (Brookhaven National Laboratory)

Jung.pdf

12:30 Lunch