The 3rd International Joint Workshop on the Standard Model and Beyond and the 11th KIAS Workshop on Particle Physics and Cosmology

Session

Morning Session

13 Nov 2023, 09:00

The Suites Hotel, Jeju Island, Korea

Conveners

Morning Session

• Pyungwon Ko (KIAS)
• Suro Kim

Morning Session

• Thomas Flacke (KIAS)
• Yu-Hui Zheng (Korea Institute for Advanced Study)

Morning Session

• Tomasz Dutka (Korea Institute for Advanced Study)
• Jongkuk Kim (KIAS)

Morning Session

• Xing-Yu Yang
• TaeHun Kim (KIAS)

Morning Session

• Tomasz Dutka (Korea Institute for Advanced Study)
• Suro Kim

60. New physics in $B\to K^{(\ast )}\nu \overline{\nu }$

German Valencia (Monash University)

13/11/2023, 09:00

We discuss the modes $B\to K^{(\ast )}\nu \overline{\nu }$ in the context of non-standard neutrino interactions and in the presence of new light (dark matter) particle pairs and consider the implications for additional $B$ decay modes. In particular, we consider the possibility of accommodating the new Belle II measurement.

48. Lepton-flavour-violating constraints from triality

Gabriela Lima Lichtenstein (University of New South Wales)

13/11/2023, 09:30

Triality models are motivated by flavour structure theories. They produce charged lepton flavour violation channels mediated by a doubly charged scalar. However, the triality charges forbid decays such as muon to electron conversions, avoiding stringent experimental bounds. We have calculated predictions of charged lepton violation in this scenario and show the complementarity between Belle II...

37. An EFT approach to lepton and baryon number violation

Juan Herrero Garcia (IFIC (University of Valencia - CSIC))

13/11/2023, 10:00

In this presentation, I will discuss lepton and baryon number violation using an Effective Field Theory (EFT) approach. In particular, in the first part of the talk, I will analyse the generation of tree-level Majorana neutrino masses by the introduction of new scalar multiplets at the electroweak scale, which acquire vacuum expectation values (VEVs). We will elucidate the underlying UV...

33. Zooming in on exotic multi-quark hadrons in QCD

Anthony Francis (National Yang Ming Chiao Tung University)

13/11/2023, 11:00

Fifty years after the discovery of QCD experimental and theoretical efforts continue to uncover structures in its spectrum - sometimes unexpectedly. In the heavy sector alone, for example, among the about 62 (LHCb'22) new hadron states observed, many are 4- or 5-quark states. These states are phenomenologically difficult to explain and conclusions are often contradictory depending on how QCD...

50. Renormalization group effects in QCD axion phenomenology

Shohei Okawa (KEK)

13/11/2023, 11:30

We study the impact of renormalization group effects on QCD axion phenomenology. Focusing on the DFSZ model, we argue that the relevance of running effects for the axion couplings crucially depends on the scale where the heavier Higgs doublet, charged under the Peccei-Quinn symmetry, is integrated out. We study the impact of these effects on astrophysical and cosmological bounds as well as on...

26. New Physics Search at Long-lived Particle Search Experiments

Kento Asai (ICRR, the University of Tokyo)

14/11/2023, 09:00

Recently, experiments for long-lived particle search are recently focused on from both theoretical and experimental points of views. This kind of experiment has advantages of low background and high luminosity and can explore light particles beyond the Standard Model (BSM) feebly coupled to the SM particles. In my talk, I explain the recent works about the explorations of the BSM physics at...

27. Observability of the Higgs boson decay to a photon and a dark photon

Hugues Beauchesne (NCTS)

14/11/2023, 09:30

Many collider searches have attempted to detect the Higgs boson decaying to a photon and an invisible massless dark photon. For the branching ratio to this channel to be realistically observable at the LHC, there must exist new mediators that interact with both the standard model and the dark photon. In this talk, we present experimental and theoretical constraints on an extensive set of...

52. One-loop expressions for h→ll¯γ in Higgs extensions of the Standard Model

Khiem Hong Phan (Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh City 700000, Vietnam; Faculty of Natural Sciences, Duy Tan University, Da Nang City 550000, Vietnam)

14/11/2023, 10:00

A systematic study of one-loop contributions to the decay channels h→ll¯γ with l=νe,μ,τ,e,μ, performed in Higgs extended versions of the Standard Model, is presented in the 't Hooft-Veltman gauge. Analytic formulas for one-loop form factors are expressed in terms of the logarithm and di-logarithmic functions. As a result, these form factors can be reduced to those relating to the loop-induced...

62. New scalar fields in the 3-3-1 model with axion-like particle

Hoa Binh Vu (Institute of Physics, Vietnam Academy of Sciences and Technology)

14/11/2023, 11:00

The scalar sector of the 3-3-1 model with axion like particle is studied in detail. In the model under consideration, there are two kinds of scalar fields: the bilepton scalars carrying lepton number two and the ordinary ones without lepton number. We show that there is no mixing among these two kinds of scalar fields. We analyze in detail the CP-odd scalar sector of the model to find the...

64. Recent Progress in Minimal G2HDM Phenomenology

Tzu Chiang Yuan (Institute of Physics, Academia Sinica)

14/11/2023, 11:30

46. Forbidden Conformal Dark Matter at a GeV

Seung J. Lee (Korea University)

15/11/2023, 09:00

In this talk, I will present a new model of DM where the DM is a composite of a spontaneously broken conformal field theory. The DM is a thermal relic with its abundance determined by the freeze-out of annihilations to dilatons, the Goldstone boson of broken conformal symmetry. If the dilaton is heavier than the DM this is an example of forbidden DM. I will present a fully realistic model that...

58. Detecting Non-Gravitational interaction of Dark Matter in Cosmology: A Case Study of Mirror Dark Matter.

Yue-Lin Sming Tsai (Purple Mountain Observatory)

15/11/2023, 09:30

In this talk, I will first try to discuss why the particle nature of dark matter is one of the most important topics of the modern physics from the historical development and frontier research of dark matter, and whether the evidence for dark matter reveals only gravitational interaction. Then, I will take one of the simplest dark matter models - mirror dark matter (the dark sector behaves...

49. Detecting afterglow signatures from light dark matter boosted by supernova neutrinos

Yen-Hsun Lin (Academia Sinica)

15/11/2023, 10:00

Supernova neutrino boosted dark matter (SNν BDM) and its afterglow effect stand as promising signatures for exploring beyond Standard Model (bSM) physics. The unique time-evolution feature of SNν BDM offers a direct avenue for inferring DM mass, concurrently leading to substantial background reduction with increasing sensitivity. In this talk, I will expound upon the SNν BDM framework...

51. Light mass window of lepton portal dark matter

Yuji Omura (Kindai University)

15/11/2023, 11:00

We explore a novel possibility that dark matter has a light mass below 1 GeV in a lepton portal dark matter model. There are Yukawa couplings involving dark matter, left-handed leptons and an extra scalar doublet in the model. In the light mass region, dark matter is thermally produced via its annihilation into neutrinos. In order to obtain the correct relic abundance and avoid collider...

18. Emergent particles of de Sitter universe: thermal interpretation of the stochastic formalism and beyond

Dr TaeHun Kim (KIAS)

15/11/2023, 11:30

A thermal interpretation of the stochastic formalism of a slow-rolling scalar field in a de Sitter (dS) universe is given. By introducing a notion of emergent particles and a dual description of scalar fields, we show that the stochastic evolution of the infrared part of the field is equivalent to the Brownian motion in an abstract space filled with a heat bath of massless particles. The 1st...

16. Characterizing the hypercharge anapole dark matter particle

Jaehoon Jeong (KIAS)

15/11/2023, 11:50

We consider the case that dark matter (DM) is solely composed of se lf-conjugate (Majorana) particle interacting with ordinary standard model (SM) matter exclusively through so-called U(1) hypercharge anapole terms. Based on the general three-point vertices of a virtual photon $\gamma$ and a massive gauge boson $Z$ and two identical on-shell particles of any spin $J$ and mass $m$, we evaluate...

43. Gravitational waves from Gauss-Bonnet-corrected inflation

Jinsu Kim (Tongji University)

16/11/2023, 09:00

I shall discuss gravitational wave signatures coming from a single-field inflation model in which the inflaton couples to the Gauss-Bonnet term. When the scalar potential term and the Gauss-Bonnet coupling term have different signs, a nontrivial fixed point arises, effectively inducing ultra slow-roll inflation. In this case, primordial black holes can form, together with enhanced...

36. One-loop effect in Higgs inflation

Minxi He (IBS)

16/11/2023, 09:30

Higgs inflation is a well-motivated inflation model because of its compatibility with observations and minimality by utilizing the Standard Model Higgs with non-minimal coupling to gravity. However, this model becomes strongly-coupled during preheating, which jeopardizes the validity of predictions by this model. Many efforts have been paid to avoid this strong coupling issue by UV-extending...

39. Gravitational Waves from Feebly Interacting Particles in a First Order Phase Transition

Ryusuke Jinno (RESCEU, The University of Tokyo)

16/11/2023, 10:00

First order phase transitions are well-motivated and extensively studied sources of gravitational waves (GWs) from the early Universe. The vacuum energy released during such transitions is assumed to be transferred primarily either to the expanding walls of bubbles of true vacuum, whose collisions source GWs, or to the surrounding plasma, producing sound waves and turbulence, which act as GW...

68. Next Year's Workshop Announcement

Dipan Sengupta (University of Adelaide)

16/11/2023, 10:30

34. Interactions between several types of cosmic strings

Kohei Fujikura (The University of Tokyo)

16/11/2023, 11:00

We study the interaction of several types of static straight cosmic strings, including local strings, global strings, and bosonic superconducting strings with and without magnetic currents. First, we evaluate the interaction energy of two widely separated cosmic strings using the point source formalism and show that the most dominant contribution to the interaction energy comes from the...

61. Using Gravitational Waves to constraint the Reheating Temperature

Liliana Velasco-Sevilla (Sogang University)

16/11/2023, 11:30

The advent of using Gravitational Waves (GW) as a powerful method to understand the evolution of our early universe has arrived. In this talk, I will present an example of how the reheating temperature can be constrained only from GW coming from the Standard Model of Particle Physics plasma of the early universe both in Standard Cosmology and in a particular Gauss-Bonnet Scenario. In addition,...

30. (Zoom) Implication of High Quality QCD axion in Dual Description

Gongjun Choi (University of Minnesota)

17/11/2023, 09:00

29. (Zoom) Dark Solar Wind

Jae Hyeok Chang (Fermilab and UIC)

17/11/2023, 09:30

We study the solar emission of light dark sector particles that self-interact strongly enough to self-thermalize. The resulting outflow behaves like a fluid which accelerates under its own thermal pressure to highly relativistic bulk velocities in the solar system. Compared to the ordinary noninteracting scenario, the local outflow has at least ~10^3 higher number density and correspondingly...

41. (Zoom) Fermion Mass Hierarchy in a Multi-Higgs Model

Joern Kersten (Yonsei University)

17/11/2023, 10:00

While the properties of the observed Higgs boson agree with the Standard Model predictions, the hierarchy of fermion masses lacks an explanation within the model. In this work, we propose a fresh approach to this problem, involving a different Higgs doublet responsible for each quark mass. We construct a model with a gauged, non-anomalous $U(1)$ family symmetry that fixes which fermion couples...

35. (Zoom) Some Recent Developments on BSM Probes with Gravitational Waves

Huaike Guo (University of Chinese Academy of Sciences (ICTP-AP))

17/11/2023, 11:00

I will describe some recent developments on using gravitational waves in searches for BSM: from phase transitions in the early universe, to searches of topological defects at LIGO, and searches for dark matter with gravitational waves.

47. (Zoom) Probing Parity Violation in the Stochastic Gravitational Wave Background with Astrometry

Qiuyue Liang (Kavli IPMU)

17/11/2023, 11:30

Astrometry holds the potential for testing fundamental physics through the effects of the Stochastic Gravitational Wave Background (SGWB) in the ∼1−100 nHz frequency band on precision measurements of stellar positions. Such measurements are complementary to tests made possible by the detection of the SGWB using Pulsar Timing Arrays. Here, the feasibility of using astrometry for the...