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RIKEN Center for Computational Science

# Field Theory Research Team

Team Leader: Yasumichi Aoki (Ph.D.)Inferring theoretical predictions from the Standard Model (SM) of elementary particles, which explains most of the existing experimental and observational results of particle physics, often require numerical computation procedures to solve Quantum Chromo Dynamics (QCD) comprised in the SM. These include the predictions of the behavior of particle systems in extreme conditions such as high temperature and/or density, and precision tests of the SM using hadronic reactions as well as investigation of physics beyond the SM.

Numerical simulations with lattice QCD techniques using a realistic set of parameters are becoming feasible. However, many significant questions remain unsolved, which we are addressing by employing lattice methods while preserving as many important symmetries as possible–the symmetries often sacrificed to make the simulations less demanding. In order to use the post-K computer for such demanding computations, we will develop algorithms, analysis methods, and codes, while performing computation on existing HPC resources. In the first principle computations of the models, we aim to bridge the energy scale layers, and thereby reveal the nature of the evolution of the universe and the mechanism of matter creation in it.

## Main Research Field

Mathematical and physical sciences

Physics / Particle

## Keywords

- Theory of Elementary Particles
- Lattice Gauge Theory
- Large Scale Numerical Computations

## Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.- Izubuchi, T, Kuramashi, Y, Lehner, C., and Shintani, E.:

“Finite-volume correction on the hadronic vacuum polarization contribution to muon g-2 in lattice QCD”

Phys. Rev. D 98, 054505, 1-13. (2018). - Kadoh, D., Kuramashi, Y., Nakamura, Y., Sakai, R., Takeda, S., and Yoshimura, Y.:

“Tensor network formulation for two-dimensional lattice N=1 Wess-Zumino model”

J. High Energ. Phys. 03, 141 (2018). - Aoki, Y., Izubuchi, T., Shintani, E., and Soni, A.:

“Improved lattice computation of proton decay matrix elements”

Phys. Rev. D 96, 014506, 1–17. (2017). - Aoki, Y., et al.: (LatKMI Collaboration)

“Light flavor-singlet scalars and walking signals in Nf = 8 QCD on the lattice”

Phys. Rev. D 96, 014508-1–57. (2017). - Chambers, A. J., Dragos, J., Horsley, R., Nakamura, Y. et al.:

“Electromagnetic form factors at large momenta from lattice QCD”

Phys. Rev. D 96, 114509 (2017). - Jin, X.-Y., Kuramashi, Y., Nakamura, Y., Takeda, S., and Ukawa, A.:

“Critical point phase transition for finite temperature 3-flavor QCD with nonperturbatively O(a) improved Wilson fermions at Nt =10”

Phys. Rev. D 96, 034523 (2017). - Aoki, Y., Ishikawa, T., Izubuchi, T., Lehner, C., and Soni, A.:

“Neutral B meson mixings and B meson decay constants with static heavy and domain-wall light quarks”

Phys. Rev. D 91, 114505-1–34. (2015). - *Aoki, Y., et al.: (LatKMI Collaboration).

“Light composite scalar in twelve-flavor QCD on the lattice”

Phys. Rev. Lett. 111, 162001. (2013). - Aoki. Y., et al.: (RBC and UKQCD Collaborations).

“Continuum Limit Physics from 2+1 Flavor Domain Wall QCD”

Phys. Rev. D 83, 074508-1–72. (2011). - *Aoki, Y., Endrodi, G., Fodor, Z., Katz, S., Krieg, S., and Szabo, K.:

“The order of the quantum chromodynamics transition predicted by the standard model of particle physics”

Nature 443, 675–678. (2006).

## Lab Members

### Principal Investigator

- Yasumichi Aoki
- Team Leader

### Core Members

- Yoshifumi Nakamura
- Research Scientist
- Issaku Kanamori
- Research Scientist
- Shinya Aoki
- Senior Visiting Scientist
- Shoji Hashimoto
- Senior Visiting Scientist