Institute Achievements and PAC-PP Recommendations

62ndPAC on Particle Physics JINR, June 23, 2025 Implementation of recommendations Itzhak Tserruya Itzhak Tserruya 62nd PAC-PP, June 23, 2025 1

Hans Gutbrod (1942-2025) Strong supporter of the NICA project Member of the PAC-PP since 2000 Chair of the MPD DAC Member of the BM@N DAC Pioneer of relativistic heavy-ion physics BEVALAC Plastic Ball first 4 detector for HI Spokesperson of the WA80/90/93 experiments at the CERN SPS. Deputy spokesperson of ALICE Director SUBATECH, Nantes Leader of the FAIR Joint Core Team His enthusiasm, imagination and optimism will be sorely missed. Itzhak Tserruya 62nd PAC-PP, June 23, 2025 2

Outline 137thScientific Council meeting (February 13-14, 2025) Agenda Itzhak Tserruya 62nd PAC-PP, June 23, 2025 3

Scientific Council (I) Excerpts from the Resolutions of the 137thsession of the SC held on February 13-14, 2025: General considerations related to the PAC-PP: The Scientific Council appreciates recent achievements of the Institute, in particular: progress in preparation for the NICA collider commissioning, and preparation of a detailed program for the physical launch of the complex in the summer of this year; successful cooling of the MPD solenoid down to the LHe temperature of 4.5 , preparation of the MPD detector for the analysis of the first data sets in fixed-target mode; progress in the analysis of Xe+CsI experimental data at an energy of 3.8 A GeV recorded by the BM@N experiment; development of the ARIADNA collaboration and its research programme, the launch of several channels for applied research, successful operation of the SOCHI chip irradiation station; successful participation in the most advanced neutrino experiments, including experiments with reactor neutrinos (JUNO), neutrinos from accelerators (NOvA, T2K), and COMET; contribution of the Institute in the work of CERN collaborations at the LHC on the second phase of upgrading the ATLAS, CMS, and ALICE detectors, as well as obtaining new results in the CERN-SPS experiments;

Scientific Council (II) Recommendations in connection with the PAC-PP: The Scientific Council acknowledges the significant progress achieved in preparation for the NICA collider commissioning, including the installation of the collider magnetic cryostat system, RF stations and final focusing lenses. A high- level of readiness of the collider s cryogenic supply system has been achieved. A detailed programme for the physical launch of the complex has been developed that foresees first collisions in the summer of this year. Several channels for applied research are ready for operation; 5 runs have already been conducted at the SOCHI chip irradiation station. The SC joins the PAC in congratulating the NICA team on these achievements. The Scientific Council notes that the main elements of all detector subsystems of the Phase-I MPD are produced. Their assembly, testing and calibration are currently underway. A test cooling of the MPD superconducting magnet to LHe temperatures was successfully performed at the end of 2024. The SC joins the PAC in congratulating the team on successfully achieving this significant milestone. The MPD experimental facility is in the final stage of construction, with the detector commissioning expected in late 2025. The SC shares the PAC s concern about a significant delay in the readiness of the MPD detector compared to the anticipated timeline of the NICA collider, and urges the MPD Collaboration to speed up the construction and installation tasks. 5

Scientific Council (III) Recommendations in connection with the PAC-PP: The Scientific Council appreciates the progress in the implementation of the BM@N project: ongoing physics analyses of the Xe-CsI collisions at an energy of 3.8 A GeV and preparation for the next physics run with a Xe beam at an energy of 2 3 A GeV. The Scientific Council notes with satisfaction that having finalized the Technical Design Report, the SPD team has started work on the first stage of the detector. Manufacturing the elements of the main detector systems has started, and progress has been achieved in establishing the computing infrastructure of the project. The Scientific Council supports the PAC s recommendation to open a new project Study of neutrino properties in accelerator experiments , comprising JINR s participation in the ongoing accelerator neutrino experiments NOvA, T2K, FASER, and DsTau, for three years with ranking A. The main objectives of the project are measurements of the neutrino masses ordering and lepton CP violation, searches for neutrinos from supernovae and exotic signals, as well as measurement of cross-sections and development of neutrino interactions models. The presented project combines the participation of JINR in experiments with neutrinos from accelerators into one project, which will make it possible to use the complementary experience of the participating groups. 6

62ndPAC-PP agenda June 23, 2025 Proposal Programme Advisory Committee for Particle Physics 62nd meeting, 23 June 2025 DRAFT PROGRAMME Highlights of today's meeting: Reports by young scientists on research in the field of particle physics Coffee break Scientific report Theoretical alculations for future electron-positron colliders: status and prospects General discussion Closed session: 9.1. Meeting of the PAC members with the JINR Directorate 9.2. PAC recommendations and proposals for the agenda of the next PAC meeting 10. Closing of the meeting 6. (1 hour) 14.00 A. Arbuzov (30 min.) https://indico.jinr.ru/event/5403 7. 15.30 Monday, 23 June 2025 9.00 1. Opening of the meeting I. Tserruya (5 min.) I. Tserruya (15 min.) V. Kekelidze (20 min.) 8. 16.20 9. Implementation of the recommendations of the previous PAC meeting Information on the Resolution of the 137th session of the JINR Scientific Council (February 2025) and on the decisions of the Committee of Plenipotentiaries of the Governments of the JINR Member States (March 2025) Reports on the ongoing projects: 4.1. Realization of the Nuclotron-NICA project Revised proposal: Development of a physics program and detectors for experiments at CEPC (old title - "Development of a particle registration technique in future experiments with the participation of JINR") 2. Update reports on NICA, BM@N and SPD 3. A. Sidorin (20 min.) V. Ryabov (20 min.) M. Kapishin (20 min.) . Guskov (20 min.) 4. 4.2. Realization of the MPD project 4.3. Realization of the BM@N project, including the physics results from the Xe beam run Coffee break 4.4. Realization of the SPD project 11.00 5. Reports on the projects terminating in 2025 and proposals for their extension: 5.1. Development of a physics program and detectors for experiments at CEPC (former project "Development of a particle registration technique in future experiments with the participation of JINR") Referees: S. Kuleshov V. Kim S. Tokar 5.2. ALICE Referees: M. Djordjevic A. Taranenko 5.3. ATLAS Referees: E. Boos S. Shmatov A. Andreev N. Piskunov 5.4. CMS Referees: Yu. Tikhonov A. Cheplakov Lunch break Extension of projects: ALICE, ATLAS, CMS Yu. Davydov (20 min.) Scientific report: Theoretical alculations for future electron-positron colliders: status and prospects B. Batyunya (20 min.) I. Yeletskikh (20 min.) Posters from Young Scientists V. Karzhavin (20 min.)

Thank you! Itzhak Tserruya 62nd PAC-PP, June 23, 2025 8