KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2018)

Session

Talks

13 Feb 2018, 09:30

Building 3 1F, Seminar Hall (KEK)

Conveners

Talks

• Mihoko Nojiri (KEK)

Talks: Talks

• Alejandro Ibarra (Technical University of Munich)

Talks: Talks

• Michelangelo Mangano (CERN)

Talks: Talks

• Matthew Reece (Harvard University)

Talks: Talks

• Kentarou Mawatari

Talks: Talks

• Alessandro Strumia (Pisa U & INFN & CERN)

Talks: Talks

• Pyungwon Ko (KIAS)

Talks: Talks

• Tony Gherghetta (University of Minnesota)

Talks: Talks

• Motoi Endo (KEK)

3. Late-time magnetogenesis

Kiwoon Choi (CTPU, IBS)

13/02/2018, 09:30

I discuss a late-time magnetogenesis scenario, which takes place after the epoch of electron/positron annihilation. It involves an ultralight axion-like particle, constituting the dark matter of the Universe, and a dark U(1) gauge boson introduced to bypass the obstacle from the relatively high conductivity of the cosmic plasma.

4. Lovely phase space

Tom Melia (Kavli IPMU)

13/02/2018, 10:00

I’ll describe a parameterisation of phase space where the physical (on-shell & momentum conserving) manifold, upon which observables have support, is identified with a coset space for the breaking of a particle number symmetry. I’ll talk about its applications to monte carlo simulation and partial wave analyses.

5. Axion coupled to hidden sector

Fuminobu Takahashi (Tohoku University)

13/02/2018, 11:00

The QCD axion may be coupled to a hidden sector. As an example, I will discuss two scenarios in which the QCD axion is coupled to a hidden photon. In the first case, the axion is coupled to massless hidden photons, and such a coupling is known to induce tachyonic instabilities if the coupling is sufficiently strong. I will explain how the tachyonic preheating affects the final axion abundance...

6. Multi-Messenger Astrophysics in the Gravitational Wave Era

Kunihito Ioka (YITP, Kyoto University)

13/02/2018, 11:30

16. Colored Dark Matter

Alessandro Strumia (Pisa U & INFN & CERN)

14/02/2018, 09:00

We explore the possibility that Dark Matter is the lightest hadron made of two stable color octet Dirac fermions $\text{Undefined control sequence Q}$. The cosmological DM abundance is reproduced for $\text{Undefined control sequence Q}$, compatibly with direct searches (the Rayleigh cross section, suppressed by $\text{Undefined control sequence Q}$, is close to present bounds), indirect searches (enhanced by $\text{Undefined control sequence Q}$ recombination),...

17. Addressing theoretical uncertainties in direct dark matter searches

Ibarra Alejandro (Technical University of Munich)

14/02/2018, 09:30

The interpretation of any experiment probing the dark matter distribution inside the Solar System is subject to our ignorance of the local dark matter density and velocity distribution, as well as our ignorance of the nature and strength of the dark matter-nucleon interaction. In this talk we present new ideas to interpret the outcome of direct detection experiments without making assumptions...

18. Recent PandaX-II Results on Dark Matter Search and PandaX-4T Upgrade Plan

Ning Zhou (Shanghai Jiao Tong University)

14/02/2018, 10:00

PandaX experiment, located at China JinPing underground Laboratory (CJPL), is a 500kg scale liquid xenon dark matter direct detection experiment. With the first 98.7-day data, PandaX-II experiment obtained stringent upper limits on the spin-independent (SI) and spin-dependent (SD) WIMP-nucleon elastic scattering cross sections. Alternative models of dark matter are also explored using this...

19. Higgs precision: a window to new physics

Kentarou Mawatari

14/02/2018, 11:00

20. Analytic Boosted Boson Discrimination at the LHC

Ian Moult (Berkeley)

14/02/2018, 11:30

In this talk I will discuss recent progress in the area of jet substructure at the LHC, focusing in particular on analytic calculations of jet substructure observables of current interest.

0. SM, Higgs, and BSM Physics at CMS

Christopher Neu (University of Virginia)

14/02/2018, 13:30

1. Latest SM results with the ATLAS detector (including SM-Higgs)

Federico Sforza (Tufts University)

14/02/2018, 14:20

The precise measurement of SM observables is a key element of the LHC programme, both as a probe of the fundamental properties of Nature and as a tool to improve future experimental and theoretical studies. This talk reviews the recent highlights in the measurement of SM processes, including the SM-Higgs properties, performed thanks to the ATLAS experiment.

2. Latest BSM results with the ATLAS detector

Arturo Sanchez Pineda (Universita di Udine, ICTP and CERN)

14/02/2018, 14:55

33. Naturalizing SUSY with the Relaxion and the Inflaton

Tony Gherghetta (University of Minnesota)

15/02/2018, 09:00

The LHC Run II superpartner mass limits have exacerbated the tuning in supersymmetric extensions of the Standard Model. A possible way to explain this tuning is via a two-field relaxion mechanism, where the second field is identified with the inflaton. I will discuss the implications of the relaxion-inflaton dynamics for supersymmetry and inflation, as well as the prospects for detecting this...

34. Distinguishing axions from WIMPs as CDM

Sacha Davidson (IN2P3/CNRS)

15/02/2018, 09:30

35. Hidden sector behind the quark mixing

Yuji Omura (KMI, Nagoya Univ.)

15/02/2018, 10:00

The small quark mixing, described by the Cabibbo-Kobayashi-Maskawa (CKM) matrix in the Standard Model, may be a clue to reveal new physics around the TeV scale. We consider a simple scenario that extra particles in a hidden sector radiatively mediate the flavor violation to the quark sector around the TeV scale and effectively realize the observed CKM matrix. The lightest particle in the...

36. Recent developments on rare B-decays

Christoph Bobeth (Technical University Munich)

15/02/2018, 11:00

After a review of tensions in charged-current and rare B decays and their interpretation in beyond SM scenarios, we focus on some developments that aim to improve theoretical control. Progress on QED corrections to leptonic decays B_s -> mu mu and B_u -> mu nu has been made, that was required in view of the current accuracy providing in the future precision at the percent level to...

37. Neutrino Oscillation Experiments and Recent Results from T2K

Konosuke Iwamoto (University of Tokyo)

15/02/2018, 11:30

Non-zero mass of the neutrinos was proved by the discovery of neutrino oscillations in 1998. Further precision measurements of the neutrino oscillations lead to understanding the matter-antimatter asymmetry of the universe. This talk provides overview of neutrino oscillations and the experimental results that contribute to measuring the oscillation parameters. Recent results and the future...

27. Unification from Scattering Amplitudes

Clifford Cheung (Caltech)

16/02/2018, 09:00

28. Cosmology of a Fine-Tuned SUSY Higgs

Matthew Reece (Harvard University)

16/02/2018, 09:30

I will discuss some work in progress that explores whether a mildly fine-tuned Higgs boson, as in (mini-)split supersymmetry, can have interesting or observable cosmological consequences. As moduli fields oscillate, the Higgs can respond and perhaps acquire very large values along a D-flat direction. Possible consequences involve a burst of gravitational wave production and an altered estimate...

29. An Update on Supersymmetric String Landscape

Taizan Watari (Kavli IPMU, the University of Tokyo)

16/02/2018, 10:00

21. Theoretical uncertainties of monojet signatures from compressed mass spectra

Lim Sung Hak (KEK)

16/02/2018, 13:45

49. Probing flavour-violating decays of squarks at the LHC

Amit Chakraborty (KEK)

16/02/2018, 14:10

We study squark decays beyond the Minimal Flavor Violation framework at the LHC. Considering mixing between the second and third generation squarks, we first provide the coverage of the current searches at the Run-1 and Run-2 of LHC in the context of a simplified model containing two active squark flavours. We then study the sensitivity of a dedicated search strategy involving leptons, jets,...

22. Beyond the LHC: physics goals and CERN's plans for future colliders

Michelangelo Mangano (CERN)

16/02/2018, 14:35

The LHC performance continues to exceed expectations, and the experiments are entering a new high-statistics phase for their studies. The projections for the ultimate physics output of the LHC are being updated, and new plans are being drawn for next steps, with scenarios ranging from an energy upgrade of the LHC, to the construction of a new 100km circular collider facility. I will review the...