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Particle and Nuclear Reaction Group (J-PARC Charm Hadron Spectroscopy Experiment) Lab
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An experimental group that explores how hadrons are formed through charmed baryons, which contain a heavy quark.
AboutAbout the lab
Exploring how hadrons are formed through charmed baryons
The J-PARC Charm Hadron Spectroscopy Experiment of the Particle and Nuclear Reaction Group aims to explore how hadrons are formed through the study of charmed baryons.
Hadrons are thought to be made of quarks, which are more fundamental particles.
Focusing on diquark correlations inside baryons, the lab investigates the ordering of energy levels, the production rates, and the decay patterns of charmed baryons.
This activity is an international collaborative project of the Research Center for Nuclear Physics, Osaka University, and is based on research cooperation with KEK and the J-PARC Center.
Key terms
- Quark
- A particle thought to be more fundamental, from which hadrons are made
- Charmed baryon
- A baryon containing a charm quark, which is a heavy quark. Baryons are a family of particles that includes protons and neutrons
- Diquark correlation
- A correlation between two quarks inside a baryon
ResearchResearch themes
How hadrons are formed is a fundamental question in hadron physics. The lab studies charmed baryons as a clue to how quarks bind to one another.
*Illustrative imageProbing diquark correlations
In light baryons, the three pairs of quarks are thought to be correlated with equal weight. When one quark is replaced by a heavy quark, however, the correlation between the two light quarks is expected to strengthen and diquark correlations to stand out. These properties are expected to appear in the ordering of energy levels, production rates, and decay branching ratios.
*Illustrative imageMeasurement with a pion beam
According to the website (around 2024), the lab expects to produce charmed baryons through the (π-, D*-) reaction on a hydrogen target and to observe those over a wide mass range regardless of decay mode. At the high-momentum beamline under construction at J-PARC, it plans to obtain a pion beam of up to 20 GeV/c with a momentum resolution of about 0.1%, and to build a spectrometer that detects the decay particles in order to measure decay branching ratios.
MembersFaculty
- ProfessorHiroyuki Nomi
- Assistant ProfessorKotaro Shirotori
- Project Assistant ProfessorKen Suzuki
- Project Assistant ProfessorKHANDELWAL MUKUL
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: “J-PARC Hadron Experimental Facility 4” Kestrel / CC BY-SA 4.0 (cropped)
- Probing diquark correlations: “Quark-gluon-plasma” S13mashina / CC BY-SA 4.0 (cropped)
- Measurement with a pion beam: “Later stage of the CLARA Accelerator, Daresbury Laboratory” Mystery Ray / CC0 (cropped)
- Related lab (Particle and Nuclear Reaction Group (Laser Electron Photon Experiments LEPS/LEPS2) Lab): “Columbia University Nevis Lab linear particle accelerator, beam injector. (photo mosaic)” CUBIST DEBRIS / CC BY-SA 4.0 (cropped)
- Related lab (Fundamental Nuclear Physics Lab (Toyonaka Facility, Tamii Lab)): “Institute of nuclear and particle physics 00048 REP SDR-73 (0693)” DimitrisSideridis / CC BY-SA 4.0 (cropped)
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