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Particle Physics Lab
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A particle physics research division that uses supercomputers to explore the force between quarks from first principles.
AboutAbout the lab
Calculating the properties of the strong force on supercomputers.
The Particle Physics Division is one of the research divisions of the Center for Computational Sciences, and it studies the strong force that acts on elementary particles.
Studying the strong force is difficult with pencil and paper alone, so the lab uses numerical simulations of lattice QCD on supercomputers.
Starting from the dynamics of quarks, the lab aims to derive the mass and interaction properties of the nucleon, a bound state of quarks.
The lab also works on elucidating the phase structure of QCD, including the ultra-high-temperature state of the early universe and the high-density state inside neutron stars.
Key terms
- Lattice QCD
- A method that divides four-dimensional spacetime into a lattice and uses supercomputers to calculate QCD, the theory of the strong force, on it
- Quark
- One of the smallest constituent particles of matter (elementary particles), on which the strong force acts. Quarks are never observed in isolation
- Hadron
- A state in which multiple quarks are bound together by the strong force. Only this state is observed in experiments
ResearchResearch themes
Of the four fundamental forces of nature, the strong force acts on quarks and causes a phenomenon called confinement. Using first-principles calculations on supercomputers, this division quantitatively studies the world at the scale of 10^-15 meters, where the strong force operates.
*Illustrative imageCalculating the strong force on a lattice
Only hadrons are observed in experiments; isolated quarks are never observed. Studying the strong force therefore requires a special method: lattice QCD defines QCD on a four-dimensional lattice and carries out first-principles calculations.
*Illustrative imagePrecise calculation of hadron masses
According to a description from around 2019, physical-point calculations using the actual quark masses found in nature have become possible, and the calculated hadron masses nearly reproduce the experimental values. The field is said to be entering an era of precision calculations at the 1% error level.
*Illustrative imageInvestigating the internal structure of the proton
According to a description from around 2019, large-volume simulations have made it possible to examine the internal structure of hadrons in detail, and the calculated electric form factor, which describes the internal structure of the proton, agrees very well with experimental values.
MembersFaculty
The members of the Particle Physics Division consist of faculty members, researchers, and joint researchers.
- ProfessorYoshinobu Kuramashi
- Associate ProfessorNaruhito Ishizuka
- Assistant ProfessorHiroshi Ono
- Assistant ProfessorShinichiro Akiyama
- Associate Professor (Joint Research Fellow)Tsuyoshi Yamazaki
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Last photograph from the Saclay Bubble Chamber” CERN / CC BY 4.0 (cropped)
- Calculating the strong force on a lattice: “NCCS Discover Supercomputer (GSFC )” NASA Goddard Space Flight Center / NASA/GSFC/Bill Hrybyk / Public domain (cropped)
- Precise calculation of hadron masses: “CERN LHC Tunnel1” Julian Herzog (Website) / CC BY-SA 3.0 (cropped)
- Investigating the internal structure of the proton: “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
- Related lab (宇宙物理研究部門): “Center of the Milky Way Galaxy IV – Composite” NASA/JPL-Caltech/ESA/CXC/STScI / Public domain (cropped)
- Related lab (高性能計算システム研究部門): “GIK Institute High Performance Computing Cluster” Me.hassan91 / CC BY-SA 3.0 (cropped)
- Related lab (原子核物理研究部門): “Institute of nuclear and particle physics 00048 REP SDR-81 (0717)” DimitrisSideridis / CC BY-SA 4.0 (cropped)
- Related lab (量子物性研究部門): “Sun Microsystems Solaris computer cluster” ChrisDag / CC BY 2.0 (cropped)
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