Toward clarification of the History of the Universe
Why our Universe was bone and how it developed into the present state? Since its birth at the Big Bang, the Universe has experienced various drastic events. Because the Universe is not a stable object, we have to understand and explain the present state as a consequence of dynamical processes the Universe has experienced. Though many events in the History of the Universe have been clarified, many pieces are still missing to understand our Universe today.
Tomonaga Center for the History of the Universe (TCHoU) was founded in October 2017 as a research center at the University of Tsukuba. The mission of the Center is to clarify the genesis of the Universe as well as the origin of matter and life and to construct an integrated view of the History of the Universe, through international and interdisciplinary collaboration of particle, nuclear, and astrophysics as well as resonant cooperation of experimental and theoretical approaches.
Toward this goal, the center has established the following four research divisions:
- Division of Antarctic Astronomy
- Division of Elementary Particles
- Division of Quark Nuclear Matters
- Division of Photon and Particle Detectors
♠
Visit [About the Center] for an overview of the Center.
♦
Visit [Projects] for the research projects of the Center.
♥
Visit [Organization] for the organization and members of the Center.
♣
Visit [Materials] for introductory materials and reports.
The name Tomonaga Center comes from Dr. Sin-Itiro Tomonaga, the second Nobel Laureate from Japan, who made fundamental contributions in constructing relativistic quantum field theories, the renormalization theory, theory of collective motions, etc. and also a founder of the physics institute at Tsukuba.
Visit Tomonaga Memorial Room, Univ. Tsukuba and Tomonaga Exibition at the University of Tsukuba Gallery for more information about Dr. Tomonaga.
(Photo: Tomonaga Memorial Room)
What's new
- 2023/5/20 The member list was updated.
- 2023/5/12 HoU seminar
- Date： May 12, 2023 (fri) 13:45-15:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Takasumi MARUYAMA (KEK)
- Title: "Search for a new neutrino oscillation with a short baseline."
- Since the 1990s, the existence of neutrinos which cannot be explained by the Standard Model (sterile neutrinos) has been indicated. This indication originated from an experiment conducted in the United States called LSND, which claimed to have observed neutrino oscillations at short distances that cannot occur through standard neutrino oscillations. However, for these 20 years, no definitive results have been obtained regarding the existence of these neutrinos.
- Under these circumstances, the JSNS2 experiment being conducted at the J-PARC Materials and Life Science Experimental Facility in Ibaraki Prefecture aims to directly test LSND's observations without any excuses. The experiment has already collected data during the long-term physics runs in 2021 and 2022, and this presentation will report the progress of the data collection, calibration, and analysis. Additionally, the physics of neutrinos other than sterile neutrino searches and their analysis status will also be presented in this talk. Furthermore, as the next upgrade, a new far detector is being built at twice the distance of the current detector in the MLF outdoor area, and its progress will also be introduced.
- Number of participants: 24
Contact: Asso.Prof. Y. Takeuchi
- 2023/04/29-30 International Workshop on Highly Baryonic Matter at RHIC-BES and Future Facilities --- beyond the Critical Point towards Neutron Stars --- (WHBM 2023)
- Date: 29-30 Apr 2023
- Venue: Rooms 1D201, 1D204, Building 1D, Univ.Tsukuba
- URL: https://conference-indico.kek.jp/event/205/
- Contact: whbm2023-loc _AT_ ml.cc.tsukuba.ac.jp
- Workshop on Highly Baryonic Matter at RHIC-BES and Future Facilities --- beyond the Critical Point towards Neutron Stars --- (WHBM 2023) will take place in Univ. of Tsukuba at Tsukuba, Ibaraki as a satellite conference of ATHIC2023, focused specially on High Density Physics topics covering Critical Point, QCD Phase Diagram, Flow, Correlations, Fluctuations, Chirality, Vorticity, Hadron interactions, Hypernuclei, Equation of State and Neutron Stars.
Contact: Prof. S. Esumi
- 2023/04/24-27 The 9th Asian Triangle Heavy-Ion Conference (ATHIC 2023)
- Date: 24-27 Apr 2023
- Venue: JMS Aster Plaza, 4-17 Kakomachi, Naka-ku, Hiroshima, Japan
- URL: https://indico.cern.ch/event/1176274/
- Contact: athic23-loc _AT_ ml.hiroshima-u.ac.jp
- The 9th Asian Triangle Heavy-Ion Conference (ATHIC 2023) will be held in Hiroshima for high energy heavy-ion physics to investigate and discuss Quark Gluon Plasma, especially on Initial state and thermal equilibrium, Jets and medium response, Heavy quarks and quarkonia, Electromagnetic probes, Collective dynamics, Correlations and fluctuations, QCD phase diagram and extreme states, QGP in small systems, Intense field and vorticity, Hadron interactions and exotics.
- 2023/03/17 Workshop on Photon and Particle Detectors
Workshop on Photon and Particle Detectors of AY2022, organized by the Photon and Particle Detectors Division of TCHoU, will be held. The workshop will be on-site (recommended) with a zoom connection available.
- Date: March 17 (Fri), 2023 13:00-16:00
- Venue: Room B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Program:
- Number of participants: 32 (including 10 remote participants)
The symposium counted in total 32 participants (including 10 remote participants) and nine talks were presented from the nuclear experiment, astronomy and particle experiment groups. The discussions were active prolonging the scheduled symposium time by nearly one hour. For the participant from abroad, the presentations were conducted in English. Although the students had sometime difficulties in explanation, the symposium should have been a good experience for them, and the symposium itself was very fruitful.
Contact: Asso.Prof. K. Hara
- 2023/03/16 Workshop by the Division of Elementary Particles
TCHoU Workshop of AY 2022 on Particle Physics, organized by the Division of Elementary Particles, is held as follows. This workshop is free to access.
- Date: March 16 (Fri), 2023 13:30-16:00
- Venue: zoom online
- Program:
Contact: Asso.Prof. Y. Takeuchi
- 2023/03/13-15 2nd International Workshop on Forward Physics and Forward Calorimeter Upgrade in ALICE
Following topics will be discussed at the workshop:
- Forward physics at high energy in pp, p-A, AA, e-p, e-A collisions/li>
- Initial condition of high energy heavy ion collisions at LHC and RHIC
- Thermalization mechanism, strong fields
- Small-x physics, gluon PDF, saturation and Color Glass Condensate (CGC)
- Forward detector upgrade using Si-W calorimeter and hadron calorimeter at LHC
- related detector technologies and upgrade projects in other fields
- Date: March 13-15, 2023
- Venue: Univ. Tsukuba
- URL: https://indico.cern.ch/event/1235107/
- Program: https://indico.cern.ch/event/1235107/timetable/#all.detailed
- Invited speakers (in alphabetical order):
-
Ian Gardner Bearden (University of Copenhagen)
Christophe De La Taille (OMEGA)
Hirotsugu Fujii (University of Tokyo)
Takahiro Fusayasu (Saga University)
Yuji Goto (RIKEN)
Tetsufumi Hirano (Sophia University)
Kensuke Homma (Hiroshima University)
Motoi Inaba (Tsukuba University of Technology)
Tommaso Isidori (University of Kansas)
Peter Martin Jacobs (Lawrence Berkeley National Lab.)
Minho Kim (RIKEN)
Youngil Kwon (Yonsei University)
Artur Lobanov (Hamburg University)
Hiroaki Menjo (Nagoya University)
Sanjib Muhuri (Department of Atomic Energy)
Takafumi Niida (University of Tsukuba)
Yasunori Osana (University of the Ryukyus)
Hidetoshi Otono (Kyushu University)
Ken Oyama (Nagasaki Inst. of Applied Science)
Thomas Peitzmann (Utrecht University, University of Tsukuba)
Dieter Roehrich (University of Bergen)
Taikan Suehara (Kyushu University)
Daniel Tapia Takaki (University of Kansas)
Ton Van Den Brink (Nikhef)
Marco Van Leeuwen (Nikhef, CERN, University of Tsukuba)
Kazuhiro Watanabe (Seikei University)
Contact: Asso.Prof. T. Chujo (LOC)
- 2023/3/24 HoU seminar
- Date： Mar. 8, 2023 (wed) 13:30-15:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Osamu TAJIMA (Kyoto University)
- Title: "CMB++"
- Observing “decoupled” objects is an experimental approach for understanding the begin of the universe as well as the origin of the matters. Cosmic microwave background (CMB) is the oldest light which we can detect, and its precise observations have given us knowledge about origin of the universe and matters. Improved measurements of the CMB polarization are currently hot research topic. In particular, it is expected that spatial patterns of the CMB polarization provides us a smoking-gun evidence for the cosmic inflation as well as new knowledge about the neutrino mass. In this seminar, I present status and prospects of ground-based CMB experiments: Simons Observatory and GroundBIRD.
- Dark matter is another decoupling object while we have not established its detection method yet. We recently started a unique project to explore light, i.e., low mass (0.05-0.1 meV/c^2), dark matter by using the technologies established in the CMB experiments. I will also present its recent results and ambitious ideas in future.
- Number of participants: about 20
Contact: Prof. F. Ukegawa
- 2023/3/3 Assi.Prof. Iida received "2023 Japan Isotope Association Incentive Award"
Takashi Iida, Assistant Professor at TCHoU, has received the 2023 Japan Isotope Association Incentive Award for his contribution to the advancement of particle science through the development of detection methods for weak radiation.
Title of the research achievement: "Advancement of Detection System for the Study of Extremely Rare Decays of 48Ca"
The award will be given during the 60th meeting of the Japan Isotope Association in July 2023.
- 2023/3/1 Assi.Prof. Iida received "2022 Konica Minolta Imaging Science Encouragement Award"
Takashi Iida in TCHoU received the 2022 Konica Minolta Imaging Science Encouragement Award in recognition of his research on a new scintillation detector for particle identification using wavelength information.
- 2023/2/24 HoU seminar
- Date： Feb. 24, 2023 (fri) 13:45-15:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Yoshikazu NAGAI (ELTE Univ., Hungary)
- Title: "Hadron Production Measurements for Neutrino Experiments at NA61/SHINE"
- In current measurements of accelerator-based neutrino experiments, neutrino flux uncertainties represent a leading systematic uncertainty. Neutrino beams are created from the decays of secondary hadrons produced in hadron-nucleus interactions. The leading source of flux uncertainty is the primary and secondary hadron production processes for neutrino beams. Therefore, precise hadron production measurements are essential.The neutrino program of the NA61/SPS Heavy Ion and Neutrino Experiment (NA61/SHINE) at CERN’s Super Proton Synchrotron makes measurements of hadron production.
- This talk will first present recent hadron production measurements for precise neutrino flux predictions needed by T2K and Fermilab long-baseline neutrino experiments. The talk will then review the performance of the latest collected data with the upgraded NA61/SHINE facility. Lastly, the talk will discuss the prospects for near future hadron production measurements in NA61/SHINE, including the possibility to extend the physics program to lower beamline energies.
Contact: Assi.Prof. T. Iida
- 2023/2/8 Press Release "Identification of Radiation Particles Using Information on the Wavelength of Scintillation Light"
A press release was issued on the results of "Research on a new particle identification method using the information on the wavelength of scintillation light emitted by scintillators", in which Assistant Professor Takashi Iida of TCHoU serves as a representative.
See press release document (in Japanese) for details.
- 2022/11/28 TCHoU Research Member Meeting / Activity and Achievement Reports
We have a research workshop to share achievements, exchanging activities and future projects for all members of TCHoU.
- Date: 28 Nov 2022 (Mo)
- Venue: Natural Science Bldg. B114 at Univ. Tsukuba (+ zoom online meeting)
- Program: (presentations are given mostly in Japanese)
- Number of participants: 43 (incl. remote 24)
- Click on the title for the presentation slide.
Contact: Asso.Prof. K. Hara
- 2022/10/31 HoU seminar
- Date： Oct. 31, 2022 (mon) 17:00-18:00
- Venue: B118, Natural Sci. Bldg. B, Univ. Tsukuba
- Speaker: Assi.Prof. Hidetoshi Otono (Kyushu Univ.)
- Title: "Status of the FASER experiment"
- The FASER experiment is a new experiment that is being placed 480 meters downstream of the ATLAS experiment at the CERN LHC. FASER is designed to discover dark photons and other light and very weakly-interacting particles that are produced in the far-forward region, outside of the ATLAS detector acceptance. FASER would also directly detect collider neutrinos for the first time and study their cross sections at TeV energies, where no such measurements currently exist. The experiment has been successfully constructed and installed, already starting data acquisition since the beginning of LHC Run 3 in 2022. This talk will present the physics prospects, detector design, and early data analysis of FASER.
Contact: Prof. F. Ukegawa
- 2022/10/24-28 31st International Workshop Vertex2022
The International Workshop on Vertex Detectors (VERTEX) is a major annual series of international workshops for physicists and engineers from the high energy and nuclear physics community. VERTEX provides an international forum to exchange the experiences and needs of the community, and to review recent, ongoing, and future activities on silicon based vertex detectors. The workshop covers a wide range of topics: existing and future detectors, new developments, radiation hardness, simulation, tracking and vertexing, electronics and triggering, applications to medical and other fields
Vertex2022 is cohosted by TCHoU. Asso.Prof. K. Hara, Div. Photon and Particle Detectors, TCHoU, is a member of the IAC and is chairing the LOC of this Workshop.
- Date: Oct. 24-28, 2022
- Venue: on-site at Tateyama Resort Hotel, Tateyama, Japan
- URL: https://indico.cern.ch/event/vertex2022
Visit the workshop web site for details.
A report on the wworkshop is available here, and a report for HEPNews (in Japanese) is here.
Contact: Asso.Prof. K. Hara
- 2022/10/14 Sayuka Kita received the Student Presentation Award of the Physical Society of Japan
Sayuka Kita, master course student of the particle experiment group in TCHoU, received the Student Presentation Award of the Physical Society of Japa for "A study of the new LGAD detector (AC-LGAD) for the finer pitch electrode," presented in the autumn meeting of JPS 2022（award recipient list for 2022/autumn). This was her second award since 2021/autumn.
In accelerator experiments, precision measurements of the reaction point and emerging particle tracks are a key to determine what kind of interaction is involved. For precision measurement of the particle properties or discovery of new particles, more reactions are required and hence the particle density increases substantially. Development of the precision particle detector operational in such environments is a of prime issue for future high precision experiments. Conventionally this has been achieved by minimizing the detector electrode size. A group of experimental particle physics group in which Ms Kita is involved, led by Division leader K. Hara and collaborative member K. Nakamura (KEK) of the Photon and Particle Division, adopts LGAD - semiconductor diode with internal gain - which is superior in timing determination, to realise a 4D detector capable of precision determination of both position and time. For minimizing the electrode size of the LGAD, the group is investigating AC-coupled electrodes, and her presentation is on the development research of such device, AC-LGAD.
- 2022/09/27 Tsukuba Global Science Week (TGSW) 2022 "Universe Evolution and Matter Origin"
As the Session 5-9 of the Tsukuba Global Science Week 2021, TCHoU is organizing International Workshop on "Universe Evolution and Matter Origin" as an on-line workshop.
- Date: Sept.28, 2022 (Sat) 12:15-21:10
- Venue: Online Zoom meeting (will be accounced to the registered participants)
- URL: TGSW / Session 5-9
- Program: program
Early Afternoon Session (Chair: Fumihiko Ukegawa) 12:50-13:00 Nario Kuno Univ. Tsukuba Opening 13:00-13:30 Tai Oshima NAOJ Probing the distant universe with the wide field of view sub-millimeter camera 13:30-14:10 Yuji Takeuchi Univ. Tsukuba R&D of Hf-STJ as FIR single-photon spectrometer for COBAND 14:10-14:40 Kazuyuki Kanaya Osaka Univ. Critical point in heavy-quark QCD at finite temperature Late Afternoon Session (Chair: ShinIchi Esumi) 15:20-15:50 Yuma Sugahara Waseda Univ. / NAOJ Emission line modeling of galaxies at Cosmic Dawn 15:50-16:30 Yong-Hamb Kim Center for Underground Phys.,
Inst. Basic Sci.0νββ Searches with Low-Temperature Thermal Calorimeters 16:30-17:00 Sheng-Cai Shi Purple Mountain Observatory,
Chinese Academy of Sci.Development of THz Astronomy in China 17:00-17:40 Joachim Stroth Frankfurt Univ. / GSI Exploring the phase structure of QCD matter at high baryo-chemical potential with HADES and CBM Evening Session (Chair: Kazuhiko Hara) 18:10-18:50 Tatsuya Masubuchi Univ. Tokyo 10th Anniversary of the Higgs Boson Discovery ―What we learned in a decade― 18:50-19:20 Kate Pattle University College London The Cold Universe: Science Highlights from the SCUBA-2 Camera 19:20-20:00 Giuseppe Iacobucci Univ. Geneve, Next generation silicon pixel detectors: towards picosecond timing 20:00-20:40 Jiangyong Jia Stony Brook Univ. / BNL Imaging the nuclear structure and the initial condition of heavy ion collisions across nuclear chart 20:40-20:50 Fumihiko Ukegawa Univ. Tsukuba Closing - Number of participants: 68 (registered: 192名)
Please click on the title for the presentation slides (in Japanese).
Contact: Prof. Yuji Takeuchi
- 2022/8/1 HoU seminar
- Date： Aug. 1, 2022 (mon) 14:00- (about one hour）
- Venue: 1F201, 1st cluster, Univ. of Tsukuba + zoom online meeting
- Speaker: Prof. Nu Xu (LBNL)
- Title: "Recent Results from RHIC Beam Energy Scan and Future Perspectives of Physics at High Baryon Density"
- In this talk, I will present recent results from the successful beam energy scan program carried out at the RHIC. The focus will be given on the latest new data from 3 GeV Au+Au collisions. The implications on collectivity, the search for QCD critical point and hyper-nuclei production will be discussed. Finally I will address the opportunities for studying nuclear matter EOS at high baryon density with the CBM experiment at FAIR.
The on-sie lecture room may be changed depending on the number of on-site participants. In case you want to participate on site, please inform the convener no later than about one week before the seminar.
Contact: Prof. S. Esumi (esumi.shinichi.gn [at] u.tsukuba.ac.jp)
- 2022/7/9 Tanabata Lecture of Astronomy
Lectures by astronomers will be held near Tanabata Day. The state-of-the-art research content will be explained in an easy-to-understand manner to the general public. (in Japanese)
- Date： 9 July 13:30－16:3
- Venue: zoom online meeting
- Program:
13:30- Mariko Nomura (National Institute of Technology (KOSEN), Kure College) The mystery of a supermassive black hole approaching with numerical simulation 15:00- Shuro Takano (Nihon University) See the matter in space with a radio telescope! -Across astronomy, physics, and chemistry- 16:30 End - Target: General public (junior high school students and above)
- Participation fee: Free (Internet communication fee is your own expense)
- Participation application: Please apply from the following URL by the day before.
- https://forms.office.com/r/vp3AERnPb4
Please click on the title for the presentation slides (in Japanese).
Contact: Prof. N. Kuno (TEL: 029-853-5080, e-mail: kuno.nario.gt [at] u.tsukuba.ac.jp)
- 2022/06/24 TCHoU Research Member Meeting / Activity and Achievement Reports
We have a research workshop to share achievements, exchanging activities and future projects for all members of TCHoU. Reports on main achievements in each field in FY 2021 are presented.
- Date: 24 Jun 2022 (Fr)
- Venue: Natural Science Bldg. B114 at Univ. Tsukuba + zoom online meeting
- Program: (presentations are given mostly in Japanese)
- Number of participants: 38
- Click on the title for the presentation slide.
Contact: Asso.Prof. Y. Takeuchi
- 2022/5/28 Open lecture "History of the Universe"
We explained the history of the universe of 13.8 billion years for high school students. We also introduced the research being conducted at the Tomonaga Center, University of Tsukuba.
- Date: 28, 29 May 2022
- Venue: 7A105, Kasuga campus, University of Tsukuba
- Program:
28 May (Sat) 13:30-14:30 Prof. M. Umemura Big bang cosmology 14:45-15:45 Asso.Prof. K. Hara Elementary particle mass and Higgs boson 16:00-17:00 Asso.Prof. Y. Takeuchi Challenge to cosmic neutrinos 29 May (Sun) 13:30-14:30 Prof. S. Esumi QGP phase transition in the early universe 14:45-15:45 Prof. N. Kuno Birth and evolution of stars and galaxies - Number of participants: 26
Contact: Asso.Prof. Y. Takeychi
- 2022/5/27 HoU Seminar
We have an TCHoU-HET-HEP Joint seminar on the CDF experiment about the W boson mass, introduced in our News on 8 Apr 2022.
- Date: 27 May 2022 (Fri) 13:45-15:00
- Venue: zoom online meeting
- Talk 1:
- Fumihiko Ukegawa (Univ. of Tsukuba)
- "The history of the CDF experiment and its early physics results, and how we detect the W boson"
- The CDF experiment at the Fermilab proton-antiproton collider started under the US-Japan Accord, which was initiated by the Fukuda-Carter dialog in 1978. After its construction in early 1980s, CDF recorded the first collisions in 1985, experienced a pilot run in 87, a first physics run in 88-89, and a substantial physics run (Run-I) in 92-96. Through the period, CDF, as an energy-frontier particle physics experiment, produced many important physics results such as the discovery of the top quark. In this talk we review the history of the experiment and explain the method to detect and measure the production and decays of the W boson.
- Talk 2:
- Koji Sato (Univ. of Tsukuba)
- "High Precision W Boson Mass Measurement with the CDF Detector"
- Tevatron is a proton-antiproton collider located at Fermi National Accelerator Laboratory in the United States of America. The CDF Experiment collected 8.8 /fb of proton-antiproton collision data during the Run II of the Tevatron operation from 2002 through 2011. The CDF Collaboration analyzed the full Run II data and obtained the measured W boson mass of 80.433.5 +/- 9.4 MeV/c^2. In this talk, we review this new W mass measurement released on April, 2022, whose precision surpasses that of the previous world average. This measurement is in tension with the Standard Model expectation.
- Number of participants: 50
Please click on the title for the presentation slides (in Japanese).
Contact: Asso.Prof. Y. Takeuchi (takeuchi [at] hep.px.tsukuba.ac.jp), Assi.Prof. Y. Asano (asano [at] het.ph.tsukuba.ac.jp)
- 2022/04/08 CDF experiment made the most precise measurement of the mass of the W boson, a carrier of the weak force
The CDF Collaboration, in which many members of the Div. of Elementary Particles, TCHoU, are taking an important part, has now measured the mass of the W boson with the best precision ever by an experiment at the Fermi National laboratory (Fermilab) in the United States. The W boson, along with the Z boson, acts as the carrier of the weak force between elementary particles. By determining its mass very precisely, coupled with information on the masses of other particles such as the top quark and the Higgs boson, one can test the standard theory of elementary particles. The new measurement shows a significant difference from the prediction of the Standard Theory of particles, at a level of seven standard deviations [Science vol.376, issue 6589, pp.125, 2022/4/7]
Visit https://hep-www.px.tsukuba.ac.jp/news/W-mass-2022/ for details (in Japanese).
The finding of CDF, suggesting existence of fundamental lows beyond the Standard Theory, has been introduced by NHK News on 25th April and news papers such as Yomiuri News Paper on 8th April.
- 2022/04 Assi.Prof. Nonaka received “Yagi award 2022”
Assi.Prof. Toshihiro Nonaka, Div. of Quark Nuclear Matters, has received “Yagi award 2022”. Dr. Nonaka has been working on RHIC-STAR experiment to search for the QCD critical point through the measurements of fluctuations of conserved charges. He established procedures to correct the observables for various experimental artifacts, which has been widely used in this field and led to the observation of the hint on the critical point at the STAR experiment. Based on these contributions, he gave a plenary talk “Experimental Summary on Fluctuations of Conserved Charges” at the Quark Matter 2022 conference held in Krakow, Poland on April 4-10, 2022.
Yagi award is based on the donation to iTHEMS, Riken, Japan from bereaved family of late Professor Kohsuke Yagi of the Univ. of Tsukuba, who was a renowned Japanese nuclear physicist. Visit https://ithems.riken.jp/ja/about/yagi-award for details of the Yagi award.
- Visit [Archive] for previous news and announcements.
