KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2018 winter) and 3rd KIAS-NCTS-KEK workshop on Particle Physics Phenomenology

Session

Plenary Session

4 Dec 2018, 09:30

Conveners

Plenary Session

• Mihoko Nojiri (KEK)

Plenary Session

• Mihoko Nojiri (KEK)

Plenary Session: Plenary Session

• Kazunori Kohiri (KEK)

Plenary Session

• Motoi Endo (KEK)

Plenary Session

• Pyungwon Ko (Korea Institute for Advanced Study)

Plenary Session

• Csaba Csaki (Cornell University)

Plenary Session

• Jose Ramon Espinosa (ICREA/IFAE Barcelona and CERN)

Plenary Session: Plenary Session

• Maxim Pospelov (University of Victoria / Perimeter Institute)

Plenary Session: Plenary Session

• Joachim Kopp (CERN)

Plenary Session

• Patrick Fox (Fermilab)

Plenary Session

• Gino Isidori (University of Zurich)

Plenary Session

• Ryuichiro Kitano (KEK)

1. Cosmological Signatures of the SM Vacuum Instability

Jose Ramon Espinosa (ICREA/IFAE Barcelona and CERN)

04/12/2018, 09:30

2. Birefringent DE/DM and CMB B-modes

Kin-Wang Ng (Academia Sinica)

04/12/2018, 10:00

We discuss CMB B-mode polarization induced by dark energy or dark matter birefringence.

3. Higgs boson pair production at HL-LHC and HL-100 Collider

Kingman Cheung (National Tsing Hua University)

04/12/2018, 11:00

We perform the most up-to-date comprehensive signal-background analysis for Higgs-pair production in HH ->b ̄b gamma gamma channel at the HL-LHC and HL-100 TeV hadron collider, with the goal of probing the self-coupling of the Higgs boson.

4. Primordial non-Gaussianities as a particle collider

Toshifumi Noumi (Kobe University)

04/12/2018, 11:30

The energy scale of inflation could be as high as 1014 GeV, hence it is a phenomenon at the highest energy scale we may explore. Primordial non-Gaussianities can then be thought of as a 1014 GeV collider (dubbed the cosmological collider), which may be used to probe new particles at the inflationary scale. In this talk I will review recent progress in the cosmological collider program...

5. Infrared frontier of fundamental physics

Maxim Pospelov (University of Victoria / Perimeter Institute)

04/12/2018, 13:30

6. The impact of EDGES 21-cm data on WIMP dark matter interactions

Yue-Lin Tsai (Academia Sinica)

04/12/2018, 14:00

The recently announced results on the 21-cm absorption spectrum by the EDGES experiment can place very stringent limits on dark matter annihilation cross sections. We properly take into account the heating energy released from dark matter annihilation from the radiation epoch to the 21-cm observation redshifts in the radiative transfer to compute the evolution of the gas temperature. Our...

7. LHC Searches for Kaluza-Klein Graviton Decaying into SM/DM Particles

Kimiko Yamashita (National Tsing Hua University)

04/12/2018, 14:30

We study the phenomenology of a massive graviton G with universal and non-universal (top-philic) couplings to the Standard Model (SM) particles. Such a particle can arise as a warped Kaluza-Klein graviton from a framework of the Randall-Sundrum extra-dimension model. We also consider simplified dark matter models where a dark matter candidate couples to the SM particles via a G mediator. We...

8. Old and recent puzzles in Flavour Physics

Gino Isidori (University of Zurich)

05/12/2018, 09:00

A series of recent results in B physics seem to indicate a coherent pattern of deviations from the Standard Model predictions. I will show how these “anomalies” could naturally be linked to the old, and still open, puzzle of quark and lepton masses, and I will discuss attempts to solve both these problems in terms of physics beyond the Standard Model.

9. Sterile Neutrinos - Whence, Where, and Whither?

Joachim Kopp (CERN)

05/12/2018, 09:30

We discuss some of the manifold ways in which sterile neutrinos (SM singlet fermions mixing with neutrinos) affect particle physics, astrophysics, and cosmology. In the first part of the talk, we focus on eV-scale sterile neutrinos as a possible explanation for various short-baseline oscillation anomalies. In the second part, we discuss several ways in which sterile neutrinos can affect dark...

10. Direct Detection Prospects for the Cosmic Neutrino Background

Martin Spinrath (National Tsing Hua University)

05/12/2018, 10:00

11. Limit on the Axion Decay Constant from the Cooling Neutron Star in Cassiopeia A

Natsumi Nagata (University of Tokyo)

05/12/2018, 11:00

The observed rapid cooling of the neutron star (NS) located at the center of the supernova remnant Cassiopeia A (Cas A) can be explained in the minimal NS cooling scenario. This consequence may be changed if there exists an extra cooling source, such as axion emission. In this work, we study the Cas A NS cooling in the presence of axion emission, taking account of the temperature evolution in...

12. Realistic axion model with "Gauged" PQ mechanism

Motoo Suzuki (ICRR)

05/12/2018, 11:30

The Peccei-Quinn (PQ) symmetry may be badly broken by the quantum gravity effect. I suggest the general prescription to protect the PQ symmetry by the gauge symmetry. Then, I mention its potential cosmological problem due to extra fermions which are introduced to cancel the self and the gravitational anomalies. Finally, I show the simple model with the B-L gauge symmetry, where the PQ symmetry...

13. Recent results from the LHC

Kirill Prokofiev (Hong Kong University of Science and Technology)

05/12/2018, 13:30

14. Resolving phenomenological problems with SIMP models with dark vector resonances

Pyungwon Ko (Korea Institute for Advanced Study)

05/12/2018, 14:30

15. The Inelastic Frontier at DM and Neutrino detectors

Patrick Fox (Fermilab)

06/12/2018, 09:00

There exist well motivated models of particle dark matter which predominantly scatter inelastically off nuclei in direct detection experiments. This inelastic transition causes the DM to up-scatter in terrestrial experiments into an excited state heavier than the DM itself. The relative competitiveness of DM search experiments is governed by the upper bound on the recoil energies employed by...

16. Cosmic neutrino searches as decaying dark matter detectors

David McKeen (TRIUMF)

06/12/2018, 09:30

The dark matter (or some of it) could exist in a form that decays to neutrinos at cosmologically late times. Proposed experiments searching for the cosmic neutrino background, such as PTOLEMY, could be sensitive to this scenario. We discuss the signals allowed at such an experiment given cosmological constraints.

17. Non-canonical forth generation leptons

Chuan-Ren Chen (National Taiwan Normal University)

06/12/2018, 10:00

18. Machine Learning in Particle Physics

Matthew Schwartz (Harvard University)

06/12/2018, 11:00

19. Inelastic Boosted Dark Matter Searches at Neutrino Detectors

Doojin Kim (University of Arizona)

06/12/2018, 11:30

The search for boosted dark matter, which often arises in two-component dark matter scenarios, has received rising attention as an alternative dark matter search strategy. I will discuss phenomenology of boosted dark matter at neutrino detectors including Super/Hyper Kamiokande, focusing on the case where such boosted dark matter scatters off target material inelastically to a heavier unstable...

28. WISP searches by Tokyo tabletop experiments group

Toshio Namba (ICEPP, the University of Tokyo)

06/12/2018, 13:30

29. Hot Topics at Belle and Belle II

Yoshiyuki Onuki (University of Tokyo)

06/12/2018, 14:00

30. Physics Beyond Colliders - Exploring BSM Physics

Joerg Jaeckel (ITP Heidelberg)

06/12/2018, 14:30

20. New directions for composite Higgs models

Csaba Csaki (Cornell University)

07/12/2018, 09:00

21. Disorder in Model Building: from the Hierarchy Problem to Colliders

Raffaele D'Agnolo (SLAC)

07/12/2018, 09:30

I will talk about two distinct ideas connected by the introduction in particle phenomenology of disordered systems with a large number of degrees of freedom. First I will show how freeze-in dark matter can solve the hierarchy problem. Then I will discuss how hidden sectors with a large number of new particles can hide at colliders.

22. Group Theoretic Approach to Theory of Fermion Production

Minho Son (KAIST)

07/12/2018, 10:00

23. Heterotic M-theory from the clockwork perspective

Sang Hui Im (Pusan National University)

07/12/2018, 11:00

A continuum limit of the clockwork mechanism provides a useful picture to understand extra dimensions. The Generalized Linear Dilaton model (GLD) realizes the continuum clockwork with varying clockwork gear masses. A special point of GLD is the linear dilaton model (LD) which has been discussed from the type II little string theory. In this talk, I will discuss a possible UV completion of GLD...

24. Determination of alpha_s from static QCD potential with renormalon subtraction

Hiromasa Takaura (Kyushu University)

07/12/2018, 11:30

We determine the strong coupling constant alpha_s from the static QCD potential by matching a theoretical calculation with lattice QCD computation. We adopt a new theoretical framework where we subtract the renormalon uncertainties, which limit the accuracy of perturbation theory, based on OPE. This allows us to take a considerably wider fitting range than ordinary perturbation theory, which...

25. A Dark Horse in Search for Non-Resonant Double Higgs

Jeong Han Kim (The University of Kansas)

07/12/2018, 13:30

We propose a novel method for measuring the triple Higgs coupling at the LHC. We choose the hh -> (b b)(l+l- MET) process, as a concrete example, which is least investigated due to huge backgrounds. The method relies on two new kinematic functions, Topness and Higgsness, which respectively characterize features of ttbar (major background) and hh events. It leads to a surprisingly high signal...

26. Charged scalars at the LHC

Gang Li (National Taiwan University)

07/12/2018, 14:00

27. Probing Dark Matter at LIGO and Mid-band

Sunghoon Jung (Seoul National University)

07/12/2018, 14:30