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

Session

Afternoon Session

14 Nov 2022, 14:00

The Grand Sumorum, Jeju

Conveners

Afternoon Session

• Hye-Sung Lee (KAIST)

Afternoon Session

• Minho Son (KAIST)

Afternoon Session

• Wan-Il Park (JBNU)

Afternoon Session

• Seodong Shin (JBNU)

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

Pouya Bakhti (JBNU)

14/11/2022, 14:00

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.

12. Non-Standard Interaction of atmospheric neutrino in future experiments

Meshkat Rajaee (JBNU)

14/11/2022, 14:20

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...

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

Sanjoy Mandal (KIAS)

14/11/2022, 14:40

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...

14. Displaced Decay Signatures in Probing Seesaw

Chandrima Sen (Indian Institute of Technology Hyderabad)

14/11/2022, 15:00

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...

15. Nucleon Decay and (Low-Scale) Pati-Salam

Tomasz Dutka (Korea Institute for Advanced Study)

14/11/2022, 15:20

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...

16. An interplay between composite Dirac neutrinos and the QCD axion

Tae Hyun Jung (KIAS)

14/11/2022, 16:20

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...

17. CP violation in gauged U(1)

Toshinori Matsui (KIAS)

14/11/2022, 16:40

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...

19. A Global Analysis of Resonance-enhanced Light Scalar Dark Matter

Yu Watanabe (University of Tokyo)

14/11/2022, 17:00

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...

20. Complex Singlet Benchmarks at Future Collider Experiments

Samuel Lane (KAIST)

14/11/2022, 17:20

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...

29. All the covariant tensor currents of massless particles in the covariant formulation

Jae Hoon Jeong (KIAS)

15/11/2022, 17:00

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...

30. Some updates on swampland phenomenology

Masahito Yamazaki (Kavli IPMU)

15/11/2022, 17:20

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

32. Detectable Gravitational Waves from Preheating and Particle Physics Phenomenology

Pankaj Saha (Seoultech)

15/11/2022, 17:40

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...

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

Ahmed Hammad (Seoultech)

17/11/2022, 17:00

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...

42. Exploring extended Higgs sectors via pair production at the LHC

Thomas Flacke (KIAS)

17/11/2022, 17:20

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...

43. Exploration of Parameter Spaces Assisted by Machine Learning

Raymundo Ramos (Seoultech)

17/11/2022, 17:40

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.

31. cold electroweak baryogenesis through halo collapse

Graham White (IPMU)

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...

33. cold electroweak baryogenesis through halo collapse

Graham White (IPMU)

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...

18. Muon g−2 and Thermal WIMP DM in U(1)Lµ−Lτ Models

Jongkuk Kim (KIAS)

U(1)Lµ−Lτ ≡ U(1)X model is anomaly free within the Standard Model
(SM) fermion content, and can accommodate the muon (g−2) data for MZ′ ∼
O(10−100) MeV and gX ∼ (4−8)×10−4. WIMP type thermal dark matter (DM) can
be also introduced for MZ′ ∼ 2MDM, if DM pair annihilations into the SM particles
occur only through the s-channel Z′ exchange. In this work, we show that this tight
correlation...

41. TBA

Dong Woo Kang (KIAS)

TBA