Prospects of Neutrino Physics

Asia/Tokyo
Kavli IPMU, Kashiwa, Japan

Kavli IPMU, Kashiwa, Japan

Kashiwa, Japan
Description

The workshop principal aim is to provide a forum to review the current status of Neutrino Physics and the prospects of this field in the next decade and beyond. The emphasis will be on the physics potential of the current and future neutrino experiments in Japan and on the large scale long term projects worldwide. Please come to the Workshop for five days of exciting physics!

Topics to be discussed at the Workshop include:
- Current status and prospects on neutrino masses and mixing
- Theoretical ideas on neutrino masses and mixing
- Results and prospects of short and long baseline neutrino oscillation experiments
- Cosmological constraints on neutrinos
- Prospect on atmospheric, solar, geo and supernova neutrinos
- Status of and prospects on leptonic CP violation
- Status of and prospects on charged lepton flavor violation (cLFV)
- Neutrinoless double beta decay
- Leptogenesis
- Proton decay
- Coherent neutrino scattering
- The status of  eV sterile neutrinos
- Non-standard neutrino interactions
- Muon decay at rest experiments
- Neutrino trident production and exotic searches

Dates: April 8th - 12th, 2019

Venue: Kavli IPMU, Kashiwa, Japan

Invited Speakers:
Takaaki Kajita (ICRR/Kavli IPMU)
Eligio Lisi (INFN Bari)
Lisa Everett (Wisconsin U.)
Masahiro Takada (Kavli IPMU)
Ken Sakashita (KEK)
Jianming Bian (U. C. Irvine)
Roger Wendell (Kyoto Univ.)
Yasuo Takeuchi (Kobe U./Kavli IPMU)
Hiroyuki Sekiya (ICRR)
Hidekazu Tanaka (ICRR)
Mark Vagins (Kavli IPMU)
Rovert Svoboda (UC Davis)
Megan Friend (KEK)
Seon-Hee Seo (Seoul National U.)
Sanjib Kumar Agarwalla (Bubaneswar/HBNI/ICTP Trieste)
Feruccio Feruglio (U. Padova)
Natsumi Nagata (U. Tokyo)
Masaki Ishitsuka (Tokyo U. of Science)
Miao He (IHEP)
Carsten Rott (Sungkyunkwan U.)
Jannik Hofestaedt (FAU)
Jessica Turner (Fermilab)
Takehiko Asaka (Niigata U.)
Kunio Inoue (Tohoku U.)
Werner Rodejohann (MPI Heidelberg)
Jouni Suhonen (U. Jyvaskyla)
Hiroko Watanabe (RCNS)
Ivan Martinez-Soler (Fermilab/Northwestern U.)
Danny Marfatia (Hawaii U.)
Yoshihiko Kuno (Osaka U.)
Lorenzo Calibbi (ITP-CAS)
Jarah Evslin (Institute of Modern Physics, CAS)
Matheus Hostert (IPPP, Durham U.)
Gordan Krnjaic (Fermilab)

Matthieu Vivier (IRFU, Saclay)
Joel Walker (Sam Houston State U.)
Michael Trott (Bohr Inst.)
Martin Spinrath (NTHU)
Morimitsu Tanimoto (Niigata U.)
Hitoshi Murayama (UC Berkeley/Kavli IPMU)

Organizers:
Shigeki Matsumoto (Kavli IPMU)
Serguey Petcov (SISSA/Kavli IPMU)
Shao-Feng Ge (Kavli IPMU/UC Berkeley)
Mark Hartz (TRIUMF/Kavli IPMU)
Masahiro Ibe (ICRR/Kavli IPMU)
Hitoshi Murayama (U. C. Berkeley/Kavli IPMU)
Michihisa Takeuchi (Kavli IPMU)

Address:
Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU),
the University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa City, Chiba 277-8583, Japan


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This workshop is supported in part by MEXT Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area): 26104009 & 18H05542


Participants
  • Andrew Cheek
  • Arindam Das
  • Asahi Kojima
  • Benjamin Quilain
  • Carsten Rott
  • Cheng-Wei Chiang
  • Christophe Bronner
  • Danny Marfatia
  • Eligio Lisi
  • Ferruccio Feruglio
  • Gordan Krnjaic
  • Hajime Fukuda
  • Hide-Kazu TANAKA
  • Hiroko Watanabe
  • Hiroyuki Ishida
  • Hiroyuki Sekiya
  • Hisashi Okui
  • Hitoshi Murayama
  • Ipsita Saha
  • Ivan Martinez-Soler
  • Jannik Hofestaedt
  • Jessica Turner
  • Jianming Bian
  • Joe Sato
  • Joel Walker
  • Jouni Suhonen
  • Jun Kameda
  • Kai Martens
  • Keigo Nakamura
  • Keisuke Harigaya
  • Ken Sakashita
  • Kenzo Nakamura
  • Kimihiro Okumura
  • Kohei Kamada
  • Lisa Everett
  • Lorenzo Calibbi
  • Martin Spinrath
  • Masahiro Ibe
  • Masaki Ishitsuka
  • Masataka Shinoki
  • Masayuki Nakahata
  • Matheus Hostert
  • Matthieu Vivier
  • Megan Friend
  • Miao He
  • michael trott
  • Michihisa TAKEUCHI
  • Michitaka Inomoto
  • Mihoko Nojiri
  • Morimitsu Tanimoto
  • Motoo Suzuki
  • Nao Izumi
  • Natsumi Nagata
  • Neil Barrie
  • Oleg Popov
  • Pablo Soler
  • Pavel Novichkov
  • Peter Cox
  • Po-Yen Tseng
  • Pranav Sharma
  • Robert Svoboda
  • Rodrigo Alonso
  • Roger Wendell
  • Ryo Nagai
  • Ryuji Kobayashi
  • Sanjib Kumar Agarwalla
  • Satoshi Shirai
  • Serguey Petcov
  • Seungho Han
  • Shao-Feng Ge
  • Shigeki Matsumoto
  • Shigetaka Moriyama
  • Shinta Kasuya
  • Shintaro Eijima
  • Shoei Nakayama
  • Shota Izumiyama
  • shunichi horigome
  • Sunny Seo
  • Syuhei Iguro
  • Taisuke Katayose
  • Takahiro Yoshida
  • TAKASHI KOBAYASHI
  • Takuya Tashiro
  • Tobias Binder
  • Tom Melia
  • Wen Yin
  • Werner Rodejohann
  • Yasuo Takeuchi
  • Yi-Peng Wu
  • yoichiro suzuki
  • Yong Tang
  • Yoshihisa Obayashi
  • Yoshitaka KUNO
  • Yuto Minami
    • 1:30 PM 3:00 PM
      Prospects of Neutrino Physics: Afternoon 1 (Chair: Serguey Petcov)
    • 3:00 PM 3:10 PM
      Group Photo 10m
    • 3:10 PM 3:30 PM
      Break 20m
    • 3:30 PM 4:30 PM
      Prospects of Neutrino Physics: Afternoon 2 (Chair: Shigeki Matsumoto)
    • 4:30 PM 4:45 PM
      Break 15m
    • 4:45 PM 5:45 PM
      Prospects of Neutrino Physics: Afternoon 3 (Chair: Sunny Seo)
    • 9:00 AM 10:30 AM
      Prospects of Neutrino Physics: Morning 1 (Chair: Masayuki Nakahata)
      • 9:00 AM
        Results from T2K and Prospects with T2K-II 30m
        Speaker: Ken Sakashita (KEK)
      • 9:30 AM
        Results from and Prospects with NOvA 30m
        Speaker: Bian Jianming (U. C. Irvine)
      • 10:00 AM
        Results and Prospects for Atmosmospheric Neutrinos at Neutrino Telescopes 30m

        Prospects for atmospheric neutrino measurements at neutrino telescope experiments (IceCube, ANTARES, KM3NeT) will be discussed

        Speaker: Carsten Rott (Sungkyunkwan U.)
    • 10:30 AM 11:00 AM
      Break 30m
    • 11:00 AM 12:15 PM
      Prospects of Neutrino Physics: Morning 2 (Chair: Yasuo Takeuchi)
    • 12:15 PM 1:30 PM
      Lunch 1h 15m
    • 1:30 PM 3:00 PM
      Prospects of Neutrino Physics: Afternoon 1 (Chair: Kenzo Nakamura)
    • 3:00 PM 3:30 PM
      Break 30m
    • 3:30 PM 4:30 PM
      Prospects of Neutrino Physics: Afternoon 2 (Chair: Kimihiro Okumura)
    • 4:30 PM 4:45 PM
      Break 15m
    • 4:45 PM 5:25 PM
      Prospects of Neutrino Physics: Presentations by Young Researchers (Chair: Michihisa Takeuchi)
      • 4:45 PM
        Tomography by neutrino pair beam 20m

        The idea of neutrino tomography is the imaging of the Earth ’s interior structure by using the neutrino. We assume the neutrino pair beam which has recently been proposed as neutrino source. The beam produces a large amount of neutrino and antineutrino pairs from the circulating partially stripped ions and provides the possibility to measure precisely the energy spectrum of neutrino oscillation probability together with a sufficiently large detector. It is shown that the pair beam gives a better sensitivity to probe the Earth’s crust compared with the neutrino sources at present. In addition we present a method to reconstruct a matter density profile by means of the analytic formula of the oscillation probability in which the matter effect is included perturbatively to the second order.

        Speaker: Hisashi Okui
      • 5:05 PM
        Testing right handed neutrinos at the linear collider 20m

        The inclusion of heavy right-handed neutrinos to the Standard Model particle content is one of the best motivated ways to account for the observed neutrino masses and flavor mixing. The modification of the charged and neutral currents from the active-sterile mixing of the neutral leptons can provide novel signatures which can be tested at the linear collider experiment. In this talk we will explore the discovery prospect of a very heavy right handed neutrinos to probe such extensions at the future liner collider. We consider the production of the heavy neutrino via the $t$ and $s$-channel processes and its subsequent decays into the semi-leptonic final states. In this talk we study a variety of prospects for the right handed neutrinos searches at the linear collider such as general parametrization and boosted object to show a discovery reach. Finally we compare our bounds on the mixing angle with the existing experimental data.

        Speaker: Arindam Das
    • 9:00 AM 10:30 AM
      Prospects of Neutrino Physics: Morning 1 (Chair: Morimitsu Tanimoto)
      • 9:00 AM
        The Modular Invariance Approach to Neutrino Masses, Mixings and Flavor Problem" 30m
        Speaker: Feruccio Feruglio (U. Padova)
      • 9:30 AM
        nuMSM and Leptogenesis 30m
        Speaker: Takehiko Asaka (Niigata U.)
      • 10:00 AM
        bb0nu Decay Searches: Current Status and Prospects 30m
        Speaker: Kunio Inoue (Tohoku U.)
    • 10:30 AM 11:00 AM
      Break 30m
    • 11:00 AM 12:30 PM
      Prospects of Neutrino Physics: Morning 2 (Chair: Eligio Lisi)
      • 11:00 AM
        Theory of bb0nu Decay: Elementary Particle Physics Aspects 30m
        Speaker: Werner Rodejohann (MPI Heidelberg)
      • 11:30 AM
        Theory of bb0nu-Decay: Nuclear Physics Aspects 30m
        Speaker: Jouni Suhonen (U. Jyvaskyla)
      • 12:00 PM
        Results and Prospects on Geo-Neutrinos 30m
        Speaker: Hiroko Watanabe (RCNS)
    • 9:00 AM 10:30 AM
      Prospects of Neutrino Physics: Morning 1 (Chair: Ferruccio Feruglio)
      • 9:00 AM
        Leptogenesis and Low-Energy Leptonic CP Violation 30m

        In this talk I discuss the possibility of producing the observed baryon asymmetry of the Universe via thermal leptogenesis, where CP violation comes exclusively from the low-energy phases of the neutrino mixing matrix. We demonstrate the viability of thermal leptogenesis across seven orders of magnitude 10^6<T (GeV)< 10^13.

        We clarify that at very high scales T > 10^12 GeV is sensitive to the low-energy phases, in contradiction with what is usually claimed in the literature.

        Speaker: Jessica Turner (Fermilab)
      • 9:30 AM
        The Neutrino Option 30m
        Speaker: Michael Trott (Niels Bohr Inst. Copenhagen U.)
      • 10:00 AM
        Status and Prospects of eV Sterile Neutrinos 30m
        Speaker: Ivan Martinez-Soler (Fermilab/Northwestern U.)
    • 10:30 AM 11:00 AM
      Break 30m
    • 11:00 AM 12:30 PM
      Prospects of Neutrino Physics: Morning 2 (Chair: Robert Svoboda)
    • 12:30 PM 1:30 PM
      Lunch 1h
    • 1:30 PM 3:00 PM
      Prospects of Neutrino Physics: Afternoon 1 (Chair: Masahiro Ibe)
      • 1:30 PM
        Experimental prospects of Charged Lepton Flavor Violation 30m
        Speaker: Yoshihito Kuno (Osaka U.)
      • 2:00 PM
        Predictions of Neutrino Mass Models for Charged Lepton Flavour Violation 30m
        Speaker: Lorenzo Calibbi (ITP-CAS)
      • 2:30 PM
        Sign of CP violating phases in neutrinos and quarks 30m

        We discuss the relation between the CP violation of the quark mixing and that of the lepton mixing by investigating a CP violating observable, the Jarlskog invariant, as well as the CP violating Dirac phase. The down-type quark mass matrix with three zeros is given in terms of the minimal number of parameters, while the up-type quark mass matrix is diagonal. These quark mass matrices leading to the successful CKM mixing angles and CP violation are embedded in both the Pati--Salam and SU(5) models. The leptonic Jarlskog invariant JCP (as well as CP violating Dirac phase) is examined for two cases:the neutrino mass matrix is diagonal or non-diagonal, where no additional CP violating phase is introduced apart from the Majorana phases. The favorable sign of the leptonic CP violation is obtained as well as the magnitude of JCP.

        Speaker: Morimitsu Tanimoto (Niigata U.)
    • 3:00 PM 3:30 PM
      Break 30m
    • 3:30 PM 4:50 PM
      Prospects of Neutrino Physics: Presentations by Young Researchers (Chair: Satoshi Shirai)
      • 3:30 PM
        Leptogenesis from active neutrino oscillation 20m

        The possibility of generating the baryon asymmetry of the Universe via flavor oscillation in the early Universe is discussed. After the inflation, leptons are born in some states, travel in the medium, and are eventually projected onto flavor eigenstates due to the scattering via the Yukawa interactions. By using the Lagrangian of the Standard Model with the Majorana neutrino mass terms, llHH, we follow the time evolution of the density matrices of the leptons in this very first stage of the Universe and show that the CP violation in the flavor oscillation can explain the baryon asymmetry of the Universe. In the scenario where the reheating is caused by the decay of the inflaton into the Higgs bosons, the baryon asymmetry is generated by the CP phases in the Pontecorvo-Maki-Nakagawa-Sakata matrix and thus can be tested by the low energy neutrino experiments.

        Speaker: Wen Yin
      • 3:50 PM
        Resonant leptogenesis at TeV-scale and neutrinoless double beta decay 20m

        We investigate a resonant leptogenesis scenario by quasi-degenerate right-handed neutrinos which have TeV-scale masses. Especially, we consider the case when two right-handed neutrinos are responsible to leptogenesis and the seesaw mechanism for active neutrino masses, and assume that the CP violation occurs only in the mixing matrix of active neutrinos. In this case the sign of the baryon asymmetry depends on the Dirac and Majorana CP phases as well as the mixing angle of the right-handed neutrinos. It is shown how the yield of the baryon asymmetry correlates with these parameters. In addition, we find that the effective neutrino mass in the neutrinoless double beta decay receives an additional constraint in order to account the observed baryon asymmetry depending on the masses and mixing angle of right-handed neutrinos.

        Speaker: Takahiro Yoshida
      • 4:10 PM
        General SU(N) Scotogenic (non-)Supersymmetric and CFT Models 20m

        Generalization of the scotogenic neutrino mass model in the supersymmetric, non-supersymmetric, and CFT framework is presented, where Standard Model gauge group $SU(3)_c\otimes SU(2)_L\otimes U(1)_Y$ is extended by $SU(N)_D$ dark gauge symmetry that stabilizes dark matter with $N\geq 2$. Neutrino masses are generated via dim-5 Weinberg effective operator, $\frac{(LH)(LH)}{\Lambda}$, therefore the $SU(N)_D$ gauge symmetry can be spontaneously broken as well as unbroken. We also discuss the embedding of $G_{SM}\otimes SU(N)_D$ gauge group into Grand Unified Theory (GUT) and gauge coupling unification.

        Speaker: Oleg Popov
      • 4:30 PM
        Higgs parity, SO(10) Unification and future colliders 20m

        Precise measurements of the standard model parameters by the LEP has shown that supersymmetry realizes precise coupling unification. We introduce a non-supersymmetric scheme of coupling unification via the Higgs parity and show how precise unification is realized. We discuss the prediction on the proton decay rate and the importance of the precise measurement of the standard model parameters.

        Speaker: Keisuke Harigaya
    • 9:00 AM 10:30 AM
      Prospects of Neutrino Physics: Morning 1 (Chair: Jessica Turner)
      • 9:00 AM
        "Theory of Neutrino Oscillations in Matter for T2K, NovA, T2HK, T2HKK and DUNE" 30m
        Speaker: Sanjib Kumar Agarwalla (Bubaneswar/HBNI/ICTP)
      • 9:30 AM
        Proton decay (Theory) 30m
        Speaker: Natsumi Nagata (U. Tokyo)
      • 10:00 AM
        Testing Seesaw with Gravitational Waves 30m
        Speaker: Hitoshi Murayama (UC Berkeley/Kavli IPMU)
    • 10:30 AM 11:00 AM
      Break 30m
    • 11:00 AM 12:30 PM
      Prospects of Neutrino Physics: Morning 2 (Chair: Shao-Feng Ge)
      • 11:00 AM
        Status and Prospects of NSI 30m
        Speaker: Danny Marfatia (Hawaii U.)
      • 11:30 AM
        Muon decay at rest for CP measurement 30m
        Speaker: Jarah Evslin (Institute of Modern Physics, CAS)
      • 12:00 PM
        Exotic Physics Searches at Neutrino Detectors 30m

        The MiniBooNE experiment has recently reported an anomalous 4.5 \sigma excess of electron-like events consistent with \nu_e appearance from a \nu_\mu beam at short-baseline. Given the lack of corresponding \nu_\mu

        disappearance observations, required in the case of oscillations involving a sterile flavor, there is strong motivation for alternative explanations of this anomaly. We consider the possibility that the observed electron-like signal may

        actually be due to hypothetical new particles, which do not involve new sources of neutrino production or oscillations. We find that the electron-like event energy and angular distributions in the full MiniBooNE data-set, including

        neutrino mode, antineutrino mode, and beam dump mode, severely limit, and in some cases rule out, new physics scenarios as an explanation for the observed neutrino and antineutrino mode excesses. Specifically, scenarios in which the new particle decays (visibly or semi-visibly) or scatters elastically in the detector are strongly disfavored. Using generic kinematic arguments, this paper extends the existing MiniBooNE results and interpretations to exhaustively

        constrain previously unconsidered new physics signatures and emphasizes the power of the MiniBooNE beam dump search to further constrain models for the excess.

        Speaker: Gordan Krnjaic (Fermilab)
    • 12:30 PM 1:30 PM
      Lunch 1h
    • 1:30 PM 3:00 PM
      Prospects of Neutrino Physics: Afternoon 1 (Chair: Jouni Suhonen)
      • 1:30 PM
        Neutrino Trident Production 30m

        Rare scattering processes at neutrino experiments can serve as an ideal tool for the search of new physics. In this context, I will present the sensitivity of the DUNE near detector to leptophilic Z' models, using neutrino-electron and neutrino trident scattering. I will then discuss how more exotic models, such as recent proposals of "dark" neutrinos, can also lead to such signatures and argue how these can be searched for.

        Speaker: Matheus Hostert (IPPP, Durham U.)
      • 2:00 PM
        Direct Detection Prospects for the Cosmic Neutrino Background 30m

        The Cosmic Neutrino Background is a solid prediction of the Standard Model of Cosmology and Particle Physics. There is plenty of indirect evidence for its existence but so far it escaped direct detection. I will explain the difficulties in such an endeavor and present some recent ideas and proposals for it. Interestingly, some of the proposals could act simultaneously as a dark matter experiment.

        Speaker: Martin Spinrath (NTHU)
      • 2:30 PM
        Coherent Scattering Results and Future Prospects 30m
        Speaker: Matthieu Vivier (IRFU, Saclay)
    • 3:00 PM 3:30 PM
      Break 30m
    • 3:30 PM 4:15 PM
      Prospects of Neutrino Physics: Afternoon 2 (Chair: Shigeki Matsumoto)
      • 3:30 PM
        Particle Physics Prospects of Neutrino Coherent Scattering 30m
        Speaker: Joel Walker (Sam Houston State U.)
      • 4:00 PM
        Closing talk 15m
        Speaker: Serguey Petcov/Shigeki Matsumoto