HEF List of Proposals / Experiments
						Oct. 5, 2026
		Title	Approval status	Status	Presentations at PAC	Publication List
	P115	Investigating d-bar+12C nuclear interactions at the J-PARC K1.8 beam line	Deferred
	T113	Proposal for an experiment to demonstrate the radiography with a multi-GeV muon beam	Test exp.		Link
	T112	Proposal for the Second Stage of the P93 experiment (Evaluation of the Properties of the Secondary Particles Delivered at the High-momentum Beam Line)	Test exp.		Link
	P111	J/ψ Production in π-p Reaction near Threshold	Deferred
	T110	Proposal for Beam Test of Improved Trigger Counter for the J-PARC E72 Experiment	Test exp.	Finished	Link (E72)	Link (E72)
	P109	Optimization of Low Momentum K+ Beam Using a Beam Degrader
	T108	Test Experiment to Optimize d-bar Beam Intensity at the K1.8 Beam Line of the J-PARC Hadron Experimental Facility	Test exp.	Finished
	E107	Proposal of the KOTO II experiment	Stage-1		Link	Link
	T105	Proposal of a test experiment for a test beam line at the K1.8 BR area	Test exp.	Conducted
	E104	Double φ Production in p-bar p Reactions near Threshold	Stage-2	Running	Link	Link
	T103	Proposal for a test experiment to evaluate the performance of the trigger-less data-streaming type data acquisition system	Test exp.	Finished		Link (E50)
	P102	Study of the peculiar bump structure at 1680 MeV by the π-p→ηn reaction with momenta of pπ=0.85-1.2 GeV/c	Deferred
	T98	Proposal for Measurement of Anti-Matter Reaction in Liquid Argon Time Projection Chamber (LArTPC)	Test exp.	Finished	Link	Link
	E97	Cascade baryon spectroscopy at J-PARC high-momentum beamline	Stage-1		Link	Link
	E96	Measurement of X rays from Ξ− C atom with an active fiber target system	Stage-2	Conducted	Link	Link
	E95	Pion-induced phi-meson production on the proton	Stage-1		Link	Link
	E94	New generation Λ hypernuclear spectroscopy with the (π+,K+) reaction by S-2S	Stage-2		Link	Link
	P93	Proposal of test experiment to evaluate performances of secondary beam mode at the high-momentum beam line	Deferred
	P92	Proposal for the E80 Phase-I Experiment: Investigation of the KNNN Bound State Focusing on the Λd Decay	Deferred		Link (E80)
	P91	Proposal for study of charm component in the nucleon via J/ψ measurement with the J-PARC E16 spectrometer	Deferred
	E90	High resolution spectroscopy of the "ΣN cusp" by using the d(K-,π-) reaction	Stage-2		Link	Link
	E89	Investigation of fundamental properties of the KNN state	Stage-1		Link
	E88	Study of in-medium modification of φ mesons inside the nucleus with φ→K+K- measurement with the E16 spectrometer	Stage-1		Link	Link
	P87	Proposal for dielectron measurements in heavy-ion collisions at J- PARC with E16 upgrades	Deferred
	E86	Measurement of the differential cross section and spin observables of the Λp scattering with a polarized Λ beam	Stage-1		Link
	P85	Spectroscopy of Omega Baryons	Deferred
	P84	High precision spectroscopy of Λ hypernuclei with the (π+,K+) reaction at the High Intensity High Resolution beamline	Deferred
	E80	Systematic investigation of the light kaonic nuclei - via the in-flight 4He(K-, N) reactions	Stage-2		Link	Link
	E79	Search for an I=3 dibaryon resonance	Stage-1		Link	Link
	T78	Proposal for 8 GeV Operation Test and Extinction Measurement	Test exp.	Finished	Link	Link (E21)
	T77	Feasibility study for 3ΛH  mesonic weak decay lifetime measurement with 4He(K-,π0)4ΛH reaction	Test exp.	Finished	Link (E73)	Link (E73)
	E75	Decay Pion Spectroscopy of 5ΛΛH Produced by Ξ-hypernuclear Decay → Phase-1 of the P75 experiment: Measurement of the formation cross section of 7Ξ-H in the 7Li(K-,K+) reaction	Phase-1 Stage-2		Link	Link
	E73	3ΛH and 4ΛH mesonic weak decay lifetime measurement with 3,4He(K-,π0)3,4ΛH reaction	Stage-2	Conducted	Link	Link
	E72	Search for a Narrow Λ* Resonance using the p(K-, Λ)η Reaction with the hypTPC Detector	Stage-2	Running	Link	Link
	E70	Proposal for the next E05 run with the S-2S spectrometer	Stage-2	Conducted	Link	Link
	E63	Proposal of the 2nd stage of E13 experiment	Stage-2	Running at K1.8	Link	Link
	E62	Precision Spectroscopy of Kaonic Helium 3 3d→2p Xrays	Stage-2	Finished	Link	Link
	E57	Measurement of the strong interaction induced shift and width of the 1s state of kaonic deuterium at J-PARC	Stage-1		Link	Link
	T55	Second Test of Aerogel Cherenkov counter for the J-PARC E36 experiment	Test exp.	had to be stopped
	T54	Test experiment for a performance evaluation of a scattered proton detector system for the Σp scattering experiment E40	Test exp.	Not yet perfomed
	T53	Test of GEM Tracker, Hadron Blind Detector and Lead-glass EMC for the J-PARC E16 experiment	Test exp.	Not yet perfomed
	T52	Test of fine pixel CCDs for ILC vertex detector	Test exp.	Not yet perfomed
	T51	Research Proposal for COMET(E21) Calorimeter Prototype Beam Test	Test exp.	had to be stopped
	E50	Charmed Baryon Spectroscopy via the (π,D*-) reaction	Stage-1		Link	Link
	T49	Test for 250L Liquid Argon TPC	Test exp.	Finished
	T47	Test of Lead-glass EMC and GEM Tracker for the J-PARC E16 Experiment	Test exp.	Finished
	T46	EDIT2013 beam test program	Test exp.	Abandonded
	E45	3-Body Hadronic Reactions for New Aspects of Baryon Spectroscopy	Stage-2	Running at K1.8BR	Link	Link
	T44	Study of in-beam performance of Hyperball-J Ge detector units with the current beam structures at the K1.1BR beam line	Test exp.	Finished
	T43	Test of Hadron Blind Detector and GEM Tracker for the J-PARC E16 Experiment	Test exp.	Finished
	E42	Search for H-Dibaryon with a Large Acceptance Hyperon Spectrometer	Stage-2	Finished	Link	Link
	E40	Measurement of the cross sections of Σp scatterings	Stage-2	Finished	Link	Link
	E36	Measurement of Γ(K+ → e+ ν)/Γ(K+→  µ+ ν) and Search for heavy sterile neutrinos using the TREK detector system	Stage-2	Finished	Link	Link
	T32	Towards a Long Baseline Neutrino and Nucleon Decay Experiment with a next-generation 100 kton Liquid Argon TPC detector at Okinoshima and an intensity upgraded J-PARC Neutrino beam	Test exp.	Finished
	E31	Spectroscopic study of hyperon resonances below KbarN threshold via the (K-,n) reaction on Deuteron	Stage-2	Conducted	Link	Link
	E29	Study of in medium mass modification for the φ meson using φ meson bound state in nucleus	Stage-1		Link	Link
	E27	Search for a nuclear Kbar bound state K-pp in the d(π+，K+) reaction	Stage-2	Finished	Link	Link
	E26	Direct measurements of ω mass modification in A(π-,n)ω reaction and ω→π0γ decays	Stage-1		Link	Link
	T25	Extinction Measurement of J-PARC Proton Beam at K1.8BR	Test exp.	Finished at K1.1BR
	E22	Exclusive Study on the ΛN Weak Interaction in  A=4 Λ-Hypernuclei	Stage-1		Link
	E21	An Experimental Search for μ − e Conversion at a Sensitivity of 10−16 with a Slow-Extracted Bunched Beam	Phase-1 Stage-2	Running	Link	Link
	E19	High-resolution Search for Θ+ Pentaquark  in π-p → K-X Reactions	Stage-2	Finished	Link	Link
	E18	Coincidence Measurement of the Weak Decay of  12ΛC and the three-body weak interaction process	Stage-2		Link	Link
	E17	Precision spectroscopy of Kaonic He 3  3d→2p X-rays	Stage-2	Replaced by E62	Link	Link
	E16	Electron pair spectrometer at the J-PARC 50-GeV PS to explore the chiral symmetry in QCD	Run-1 Stage-2	Running	Link	Link
	E15	A Search for deeply-bound kaonic nuclear states by in-flight 3He(K-, n) reaction	Stage-2	Finished	Link	Link
	E14	Proposal for KL →π0 ν ν-bar Experiment at J-PARC	Stage-2	Running	Link	Link
	E13	Gamma-ray spectroscopy of light hypernuclei	Stage-2	Finished	Link	Link
	E10	Production of Neutron-Rich Λ-Hypernuclei with the Double Charge-Exchange Reaction	Stage-2	Partly conducted	Link	Link
	E08	Pion double charge exchange on oxygen at J-PARC	Stage-1		Link
	E07	Systematic Study of Double Strangeness System with an Emulsion-counter Hybrid Method	Stage-2	Finished	Link	Link
	E06	Measurement of T-violating Transverse Muon Polarization in K+ → π0 µ+ ν Decays	Stage-2		Link	Link
	E05	Spectroscopic Study of Ξ-Hypernucleus, 12ΞBe, via the 12C(K-, K+) Reaction	Stage-2	Finished	Link	Link
	E03	Measurement of X rays from Ξ- Atom	Phase-1 Stage-2	Finished	Link	Link