KEK-PH Lectures and Workshops 2020

Session

KEK-PH collider

4 Aug 2020, 10:00

Conveners

KEK-PH collider: Lecture:Physics at e+e-collider(Prof. Michael Peskin)

• Mihoko NOJIRI (Professor)

KEK-PH collider: (workshop)

• Mihoko NOJIRI (Professor)

KEK-PH collider: Lecture: Basics of Hadron Collider Physics(Dr. Zhen Liu)

• There are no conveners in this block

KEK-PH collider: Lecture Advanced topics of Hadron Collider Physics (Dr. Zhen Liu)

• Mihoko NOJIRI (Professor)

KEK-PH collider: (workshop)

• Mihoko NOJIRI (Professor)

2. Physics at e+e-collider

Prof. Michael Peskin (SLAC)

04/08/2020, 10:00

Part 1
General introduction: Why do we need new physics beyond the SM?
General introduction: processes in e+e- as a function of energy; run plan of the ILC
Higgs boson: SM predictions for the decay rates and properties -- and, brief review of LHC measurements
Higgs boson: BSM effects on the Higgs couplings
Higgs boson: aspects of the experimental study in e+e-
Higgs boson: ...

4. Physics at e+e-colliders

Prof. Michael Peskin

04/08/2020, 11:30

Part 2.
e+e- -> 2 fermion reactions at e+e- colliders, s-channel resonance and compositeness searches
top quark: general theoretical orientation
top quark: threshold region
top quark: continuum region
top quark: possible BSM effects and tests of these
e+e- at high energy: e+e- -> t tbar h
e+e- at high energy e+e- -> hh + X
the long future of the ILC laboratory

9. Heavy quark pair productions at ILC

Dr Ryo Yonamine (Tohoku)

04/08/2020, 13:30

We expect the ILC with polarized beams will shed light on the chiral structures of the electroweak couplings to all fermions. In the experimental viewpoint, the key of such measurements is to discriminate between fermion and anti-fermion in pair production events. In this talk, I will report recent developments and what we have achieved so far based on the studies within the ILD collaboration,...

10. Dark matter detection at future lepton colliders

Prof. Shigeki Matsumoto (Kavli IPMU)

04/08/2020, 14:00

Future lepton colliders are now intensively discussed around the world, and we have so far four proposals of the colliders; one from Asia (ILC and CEPC) and the other from Europe (FCC-ee and CLIC). The main goal of the colliders at the first stage (s1/2 = 240-250 GeV) is to precisely measure known Higgs couplings to tackle the problem of the electroweak symmetry breaking. On the other hand, it...

13. Early kinetic decoupling of dark matter and the Higgs invisible decay in collider experiments

Dr Tomohiro Abe (KMI, Nagoya)

04/08/2020, 14:20

We revisit the Higgs-to-invisible decay ratio in Higgs-portal dark matter models. The Higgs-to-invisible decay searches are powerful probes of the models with increasing sensitivity in upcoming colliders. Close to the mass threshold of a Higgs decay into a pair of DM particles, the coupling value is expected to be very small in order to be compatible with the observed value of the thermal...

12. SUSY models for the muon g-2 anomaly, and their implications

Dr Norimi Yokozaki (KEK)

04/08/2020, 14:40

The muon g-2 anomaly is an important guide towards new physics beyond the Standard Model as it indicates new particles lighter than O(100) GeV. Supersymmetric standard model is an attractive candidate explaining the anomaly since it also solves other important puzzles: the hierarchy problem, charge quantization and dark matter nature. In this talk, I would like to show that, by considering...

14. Anomaly Mediation at Future Hadron Colliders

Dr So Chigusa (KEK)

04/08/2020, 15:20

We discuss prospects of studying models with anomaly mediated
supersymmetry breaking at future hadron colliders with centre-of-mass
energy of 100 TeV. In such a class of models, charged Wino becomes
long-lived with its decay length of ∼ 6 cm, and the charged Wino
tracks may be identified in particular by the inner pixel detector;
the charged Wino tracks can be used not only for the...

15. Higgs self-coupling as a probe of sphaleron properties

Prof. Shinya Kanemura (Osaka)

04/08/2020, 15:40

Sphaleron is a non-perturbative solution of electroweak gauge theories, which is crucially important for various scenarios of baryogenesis. In many of new physics models, the deviation in the sphaleron energy from the standard-model prediction is proportional to that in the triple Higgs boson coupling with opposite signs. This interesting relation would be useful to determine the sphaleron...

16. Probing μτ flavor-violating solutions for the muon g−2 anomaly at colliders

Dr Michihisa Takeuchi (KMI, Nagoya)

04/08/2020, 16:00

The discrepancy between the measured value and the Standard Model prediction of the muon anomalous magnetic moment is one of the most important issues in the particle physics. It is known that introducing a mediator boson X with the μτ lepton flavor violating (LFV) couplings is one good solution to explain the discrepancy, due to the τ mass enhancement in the one-loop correction. We study the...

5. Lecture1: Basics of Hadron collider

Dr Zhen Liu (Maryland)

05/08/2020, 10:00

Lecture 1: Basics of Hadron Collider Physics
Intro to colliders
Parton distribution function
Kinematics
Discovery of the Higgs boson

I will introduce the basic concepts of hadron collider physics in the first part of the lecture and discuss a few advanced topics in the second part of the lecture. The goal is to let the audience get familiar with the key concepts/methodology of hadron...

3. Lecture 2: Advanced topics of Hadron Collider Physics

Prof. Zhen Liu (Maryland)

05/08/2020, 11:30

A bit of Statistics
Precision: Jets, Higher-order corrections, more kinematics, and machine learning
Long-Lived Particles
Future hadron colliders (physics)

I will introduce the basic concepts of hadron collider physics in the first part of the lecture and discuss a few advanced topics in the second part of the lecture. The goal is to let the audience get familiar with the key...

17. Tagging boosted weak gauge bosons with deep learning

Prof. Cheng-Wei Chiang (National Taiwan University)

05/08/2020, 13:30

We demonstrate that the classification of boosted, hadronically-decaying weak gauge bosons can be significantly improved over traditional cut-based and BDT-based methods by using deep learning and the jet charge variable. We construct binary taggers for W+ vs. W− and Z vs. W discrimination, as well as an overall ternary classifier for W+/W−/Z discrimination. We construct both ordinary and new...

18. Minkowski Functionals for Jet Tagging

Dr Sung Hak LIM

05/08/2020, 13:50

19. Learning Physics at Future e-e+ Colliders with Machine

Prof. Tao Liu (The Hong Kong University of Science and Technology)

05/08/2020, 14:10

Information deformation and loss in jet clustering are one of the major limitations for precisely measuring hadronic events at future e−e+ colliders. Because of their dominance in data, the measurements of such events are crucial for advancing the precision frontier of Higgs and electroweak physics in the next decades. In a recent arXiv paper (https://arxiv.org/pdf/2004.15013.pdf), the speaker...

20. Flavor Physics at Future Z-Factories: $b\to s\tau \tau$ Measurements and Beyond

Dr Lingfeng Li (HKUST)

05/08/2020, 14:30

$b\to s{\tau }^{+}{\tau }^{-}$ measurements are highly motivated for addressing lepton-flavor-universality(LFU)-violating puzzles such as $R_{K^{(\ast )}}$ anomalies. The anomalies of $R_{D^{(\ast )}}$ and $R_{J/\psi }$ further strengthen their necessarity and significance, given that the LFU-violating hints from both involve the third-generation leptons directly. $Z$ factories of future $e^{-}{e}^{+}$ colliders...

21. Search for lepton-flavor violating processes at LHC

Prof. Soji Tsuno (KEK)

05/08/2020, 15:10

22. Cornering Higgsino at the LHC

Dr Satoshi Shirai (Kavli IPMU, Tokyo)

05/08/2020, 15:40

A Higgsino-like particle is an attractive candidate for the WIMP dark matter. Thanks to the electroweak interaction, the production cross section of the Higgsino at the LHC is rather high. However, the huge Standard Model background prevents the Higgsino discovery, and the present LHC sensitivity can be even worse than the LEP result in some parameter region. In this talk, I discuss a new...

23. Probing long-lived particles at Higgs factories

Dr Zeren Simon Wang (APCTP)

05/08/2020, 16:00

We study displaced vertex signatures of long-lived particles (LLPs) from exotic Higgs decays in the context of a Higgs-portal model and a neutral-naturalness model at the circular electron positron collider (CEPC) and future circular collider e+ e− (FCC-ee). Such two models feature two representative mass ranges for LLPs, which show very different behavior in their decay signatures. The...

24. Searches for new light particles at ILC main beam dump

Dr Yasuhito Sakaki (KEK)

05/08/2020, 16:20

The International Linear Collider (ILC) is the highest-priority next collider as a Higgs factory. In the linear collider, almost all accelerated particles that do not interact strongly at the collision point are not recycled and are all thrown into beam dumps, which is very different from the case of circular colliders. Therefore, a beam dump experiment in the linear collider can be...