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KEK-PH Lectures and Workshops 2021

1 May 2021 to 31 March 2022
Asia/Tokyo timezone

Contribution List

41 out of 41 displayed
  1. 2. Muon g-2 and Δα connection
    Dr Massimo Passera (INFN, Padua)
    11/05/2021, 17:00

    The Muon g-2 experiment at Fermilab has recently confirmed Brookhaven's earlier measurement of the muon anomalous magnetic moment aμ. This new result increases the discrepancy Δaμ with the Standard Model (SM) prediction and strengthens its "new physics" interpretation as well as the quest for its underlying origin. In this talk I will review the SM prediction of the muon g-2, focusing on some...

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  2. 3. Consistency of the hadronic vacuum polarization between lattice QCD and the R-ratio
    Prof. Christoph Lehner (Regensburg U. and Brookhaven Natl. Lab.)
    19/05/2021, 17:00

    I will review the current status of data-driven R-ratio as well as lattice QCD determinations of the hadronic vacuum polarization. I will then discuss universality tests within the lattice QCD community and the consistency with data-driven results based on the R-ratio. The talk will also present expected progress in the coming years.

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  3. 4. Future laser and beam driven high gradient accelerator technology
    Prof. Mitsuhiro Yoshida (Accelerator Laboratory, KEK)
    23/06/2021, 16:00

    Recent high gradient accelerator technologies will be introduced. Most popular high gradient accelerator is the laser plasma wakefield accelerator and it reaches up to 100 GV/m level. However it is currently low repetition rate and difficult for the cascading acceleration. On the other hand, there are another accelerator technologies to realize the high repetition and the cascading...

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  4. 5. Muon Collider
    Prof. Daniel Schulte (CERN)
    30/06/2021, 16:00

    A muon collider provides a unique path to a high-energy, high-luminosity lepton collider that combines precision measurements and discovery potential. The talk will introduce the scheme and highlight some key challenges. It will also introduce the new collaboration that plans to develop the concept.

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  5. 9. Primordial Black Holes from Long-Range Scalar Forces and Scalar Radiative Cooling
    Mr Marcos Flores (UCLA)
    19/10/2021, 13:30

    Primordial black holes (PBHs) are a natural consequence of long-range scalar forces in the early Universe. These forces can lead to the formation of halos of heavy particles, Q-balls or oscillons even during the radiation dominated era. This same force removes energy and angular momentum from virialized systems via scalar radiation, leading to the subsequent formation of black holes. We will...

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  6. 18. Primordial black holes in peak theory with a non-Gaussian tail
    Dr Yuichiro Tada (Nagoya U)
    19/10/2021, 14:00

    In this work, we update the peak theory for the estimation of the primordial black hole (PBH) abundance,
    particularly by implementing the critical behavior in the estimation of the PBH mass and employing the averaged compaction function for the PBH formation criterion to relax the profile dependence.
    We apply our peak theory to a specific non-Gaussian feature called the exponential tail,...

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  7. 19. Spins of primordial black holes formed in the radiation-dominated phase of the universe: first-order effect
    Prof. Tomohiro Harada (Rikkyo U)
    19/10/2021, 14:30

    The standard deviation of the initial values of the nondimensional Kerr parameter a∗ of primordial black holes (PBHs) formed in the radiation-dominated phase of the universe is estimated to the first order of perturbation for the narrow power spectrum. Evaluating the angular momentum at turn around based on linearly extrapolated transfer functions and peak theory, we obtain the expression....

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  8. 20. Ultrahigh-energy Gamma Rays and Gravitational Waves from Primordial Exotic Stellar Bubbles
    Mr Qianhang Ding (HKUST)
    19/10/2021, 15:00

    We put forward a novel class of exotic celestial objects that can be produced through phase transitions occurred in the primordial Universe. These objects appear as bubbles of stellar sizes and can be dominated by primordial black holes (PBHs). We report that, due to the processes of Hawking radiation and binary evolution of PBHs inside these stellar bubbles, both electromagnetic and...

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  9. 6. Primordial Black Holes and Gravitational Wave Observations
    Dr Gabriele Franciolini (Geneva U)
    19/10/2021, 16:00

    Primordial Black Holes might comprise a significant fraction of dark matter in the Universe and can give rise to observable signatures at current and future gravitational wave experiments. First, we review the PBH model and discuss how accretion and clustering may affect the properties of PBH binaries. Second, we confront the PBH model with LIGO/Virgo data showing its upsides and shortcomings,...

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  10. 8. Primordial black holes as a LIGO-Virgo and dark matter candidate
    Dr Christian Byrnes (Sussex U)
    20/10/2021, 16:00

    Although black holes can be the remnants of dead stars, it is also possible that some are primordial. Such primordial black holes are the unique dark matter candidate which is not a new type of particle, and they could also explain some of the unexpected properties of the black hole mergers that LIGO and Virgo have detected. I will summarise the evidence and (fine-tuning) challenges behind...

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  11. 10. Crunching Naturalness
    Michael Geller (Tel Aviv U.)
    16/11/2021, 16:00
  12. 11. Aspects of Cosmological Selection of the Weak Scale
    Raffaele D'Agnolo (IPhT, Saclay)
    16/11/2021, 16:45
  13. 12. S-matrix exclusion of de Sitter landscape, and naturalness
    Gia Dvali (Munich U., ASC and Munich, Max Planck Inst.)
    16/11/2021, 17:45
  14. 13. Gegenbauer Goldstones
    Matthew McCullough (CERN)
    16/11/2021, 18:30
  15. 14. A Causal Framework for Non Linear Quantum Mechanics
    Surjeet Rajendran (Johns Hopkins U.)
    17/11/2021, 09:00
  16. 15. Solving the naturalness puzzle using old ideas
    Anson Hook (Maryland U.)
    17/11/2021, 10:00
  17. 16. Brane Probes, Finiteness and Distance Conjecture
    Yuta Hamada (Harvard U.)
    17/11/2021, 11:00
  18. 17. Consequences of No Global Symmetries in Quantum Gravity
    Tom Rudelius (UC, Berkeley)
    17/11/2021, 11:45
  19. 24. Jet physics with ATLAS
    Prof. Takuya Nobe
    30/11/2021, 16:15

    New physics searches using jet substructure are actively performed at the LHC era. There are several new techniques with ATLAS to extract the substructure information more precisely. A new particle-flow algorithm, unified-flow objects (UFOs), is recently developed to improve the resolution of the substructure variables. On top of that, to identify boosted W/Z/top/H decaying to hadrons, as well...

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  20. 25. Jets through the LHC era
    Prof. Gavin Salam
    30/11/2021, 17:00

    In this talk I will give a personal view of some of the major theoretical advances that have been made in jet physics through the LHC era so far. Topics that I will touch on will include the development of infrared safe jet finders, essential for quantitative interpretation of LHC data; the development of the field of jet substructure to identify hadronic decays of boosted electroweak bosons;...

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  21. 26. Boosted jet physics in CMS
    Prof. Cristina Mantilla
    01/12/2021, 10:00

    Many measurements and searches at the Large Hadron Collider need to identify highly boosted particles that decay to hadronic final states. The decay products of these particles will be closely collimated and reconstructed into one single large-radius jet. One can then use jet substructure and deep learning approaches to learn information about the radiation pattern inside the jet and mitigate...

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  22. 43. Resonant excitation of the axion field during the QCD phase transition
    Prof. Wei Xue (University of Florida)
    09/03/2022, 11:05
  23. 27. Reheating after Mixed Higgs-R^2 Inflation
    Minxi He (KEK)
    09/03/2022, 13:30
  24. 28. Massless Preheating and Electroweak Vacuum Metastability
    Takahiro Terada (Institute for Basic Science)
    09/03/2022, 14:05
  25. 29. Constrained Superfields in Dynamical Background
    Shuntaro Aoki (Chung-Ang University)
    09/03/2022, 14:30
  26. 30. Parametric resonance instability of the QCD axion
    Naoya Kitajima (Tohoku University)
    09/03/2022, 15:20
  27. 31. Cosmological effects of Peccei-Quinn symmetry breaking on QCD axion dark matter
    Shota Nakagawa (Tohoku University)
    09/03/2022, 15:55
  28. 33. Origin of pseudo-Nambu-Goldstone dark matter
    Yoshihiko Abe (Kyoto University)
    09/03/2022, 16:20
  29. 34. Dark radiation abundance in axion-SU(2) model
    Masahito Ogata (University of Toyama)
    10/03/2022, 11:00
  30. 35. Searching for axion dark matter/gravitational waves with magnons
    Asuka Ito (Tokyo Institute of Technology)
    10/03/2022, 11:25
  31. 36. Electroweak baryogenesis in the three-loop neutrino mass model with dark matter
    Kazuki Enomoto (Osaka University)
    10/03/2022, 13:30
  32. 37. Contribution of Weinberg operator to EDM
    Naohiro Osamura (Nagoya University)
    10/03/2022, 14:05
  33. 38. Evolution of Lepton Number for Neutrinos
    Nicholas J. Benoit (Hiroshima University)
    10/03/2022, 14:30
  34. 39. Electroweakly interacting spin-1 dark matter and its phenomenology
    Motoko Fujiwara (Nagoya University)
    10/03/2022, 15:20
  35. 40. Chiral Composite Asymmetric Dark Matter
    Keiichi Watanabe (The University of Tokyo, ICRR)
    10/03/2022, 15:55
  36. 41. Electroweak-Skyrmion as Asymmetric Dark Matter
    Yu Hamada (KEK)
    10/03/2022, 16:20
  37. 21. Jet physics with ATLAS
  38. 23. Jet physics with ATLAS

    New physics searches using jet substructure are actively performed at the LHC era. There are several new techniques with ATLAS to extract the substructure information more precisely. A new particle-flow algorithm, unified-flow objects (UFOs), is recently developed to improve the resolution of the substructure variables. On top of that, to identify boosted W/Z/top/H decaying to hadrons, as well...

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  39. 22. Jets through the LHC era
  40. 42. Resonant excitation of the axion field during the QCD phase transition
    Prof. Wei Xue (University of Florida)
  41. 32. Searching for axion dark matter/gravitational waves with magnons
    Asuka Ito