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Quark-Hadron Theory (H) Lab
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The lab tackles the puzzles of hadrons starting from the theory of quarks and gluons.

AboutAbout the lab
Approaching the makeup of matter from quarks.
The H Lab (Quark-Hadron Theory Lab) aims to elucidate quantum chromodynamics (QCD), the fundamental theory describing the dynamics of quarks and gluons.
The lab theoretically studies the structure of hadrons, which are particles made up of bound quarks, and their behavior at high temperature and high density.
Research on dense matter also contributes to understanding cosmic phenomena such as the internal structure of neutron stars, neutron star mergers, and supernova explosions.
The lab aims to develop new theories and models to solve puzzles from experiments and to make proposals for future experiments.
Key terms
- Quantum Chromodynamics
- The theory that explains the "strong force" binding quarks together through the exchange of gluons. Also called QCD
- Hadron
- A general term for particles made up of bound quarks, such as protons, neutrons, and mesons
- Spontaneous Chiral Symmetry Breaking
- A phenomenon in which a symmetry of the theory is broken by the properties of the vacuum. It is closely related to the mechanism by which the masses of protons and neutrons arise
ResearchResearch themes
With the goal of elucidating quantum chromodynamics, the fundamental theory describing the dynamics of quarks and gluons, the lab studies the structure of hadrons, as well as the phase structure and phase transitions of quark-hadron many-body systems at high temperature and high density. Within the frameworks of effective models and phenomenological models, the lab develops new theories and models, aiming at a multifaceted understanding of hadron physics.
*Illustrative imageExotic Hadrons
Accelerator experiments have reported many "exotic hadrons" that cannot be explained as three quarks or as a quark-antiquark pair. The lab aims to clarify their structure and properties using hadron effective models and quark models.
*Illustrative imageHadrons Containing Heavy Quarks
Besides exotic hadrons, hadrons containing heavy quarks are being discovered one after another. Through spectroscopy analyses using effective models and quark models, the lab works to clarify their structure in coordination with its research on exotic hadrons.
*Illustrative imageThe Nature of Scalar Mesons
Light scalar mesons are thought to be particles closely related to mass generation through spontaneous chiral symmetry breaking. The lab uses effective models to analyze their composition and structure, as well as ways to confirm them in experiments.
*Illustrative imageDense Nuclear Matter and Neutron Stars
The structure of dense nuclear matter and quark matter affects the equation of state inside neutron stars. The lab constructs dense nuclear matter with effective models that incorporate "chiral invariant mass," and is testing the "chiral invariant mass" by comparing the results with neutron star observations.
MembersFaculty
Members of the H Lab consist of faculty, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorMasayasu Harada
- Assistant ProfessorDaiki Suenaga
VoicesStudent voices
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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: “-A4-at-144-dpi” Pcharito / CC BY-SA 3.0 (cropped)
- Exotic Hadrons: “Zeus jul08” Luis Sanchez (talk) / CC BY-SA 3.0 (cropped)
- Hadrons Containing Heavy Quarks: “Kedr-detector-inp-0811” Вадим Махоров / CC BY 4.0 (cropped)
- The Nature of Scalar Mesons: “Feynman Diagram - Negativ Beta Henfall” Thymo / Public domain (cropped)
- Dense Nuclear Matter and Neutron Stars: “NASA Supercomputer Probes Tangled Magnetospheres of Merging Neutron Stars (SVS14884 - NS EmissionRegions Still)” NASA's Scientific Visualization Studio - NASA’s Goddard Space Flight Center/D. Skiathas et al. 2025Alt text: Simulation showing highest-energy light from merging neutron stars / Public domain (cropped)
- Related lab (物性理論
(凝縮系) (Sc)): “Suspension of a superconductor by a magnet” Julien Bobroff (user:Jubobroff), Frederic Bouquet (user:Fbouquet), Jeffrey Quilliam, LPS, Orsay, France / CC BY-SA 3.0 (cropped) - Related lab (高エネルギー素粒子物理学 (N)): “Accelerator Desy 2” Milkodromeda / CC BY-SA 4.0 (cropped)
- Related lab (非平衡物理 (R)): “LRO granular debris flow on the wall of Stevinus A crater” NASA/GSFC/Arizona State University / Public domain (cropped)
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