Prospects of Neutrino Physics

8 Apr 2019, 13:30 → 12 Apr 2019, 18:00 Asia/Tokyo

Kavli IPMU, Kashiwa, Japan

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

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Monday 8 April

13:30 → 15:00 Prospects of Neutrino Physics: Afternoon 1 (Chair: Serguey Petcov)

13:30 Opening talk

Speaker: Serguey Petcov/Shigeki Matsumoto

Information.pdf

13:45 Prospects in Neutrino Experiments

Speaker: Takaaki Kajita (ICRR/Kavli IPMU)

190408 IPMUworkshop takaaki kajita.pdf

14:30 Three-Neutrino Masses, Mixing and CP Violation: Status and Challenges

Speaker: Eligio Lisi (INFN, Bari)

LISI_IPMU_2019.pdf

15:00 → 15:10 Group Photo

15:10 → 15:30 Break

15:30 → 16:30 Prospects of Neutrino Physics: Afternoon 2 (Chair: Shigeki Matsumoto)

15:30 Cosmological Constraints on Massive Neutrinos

Speaker: Masahiro Takada (Kavli IPMU)

Neutrino_Cosmology_MasahiroTakada.pdf

16:00 Review of Theoretical Ideas on Neutrino Masses

Speaker: Lisa Everett (U. Wisconsin-Madison)

ipmu_2019_everett.pdf

16:30 → 16:45 Break

16:45 → 17:45 Prospects of Neutrino Physics: Afternoon 3 (Chair: Sunny Seo)

16:45 Prospects with SK-Gd

Speaker: Mark Vagins (Kavli IPMU)

Vagins_Gad_IPMU190408.pdf

17:15 Review of the results of Reactor Neutrino Experiments (Daya Bay, RENO, Double Chooz)

Speaker: Masaki Ishitsuka (T. U. of Science)

Reactor-Ishitsuka-20190408.pdf

Tuesday 9 April

09:00 → 10:30 Prospects of Neutrino Physics: Morning 1 (Chair: Masayuki Nakahata)

09:00 Results from T2K and Prospects with T2K-II

Speaker: Ken Sakashita (KEK)

t2k_results.20190409.pdf

09:30 Results from and Prospects with NOvA

Speaker: Bian Jianming (U. C. Irvine)

nova_PrespectsNu_2019_04_08.pdf

10:00 Results and Prospects for Atmosmospheric Neutrinos at Neutrino Telescopes

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

Speaker: Carsten Rott (Sungkyunkwan U.)

AtmNuPhysics_with_NeutrinoTelescopes_Rott_Apr2019.pdf

10:30 → 11:00 Break

11:00 → 12:15 Prospects of Neutrino Physics: Morning 2 (Chair: Yasuo Takeuchi)

11:00 Prospects on SuperNova Neutrinos with SK and HK

Speaker: Hiroyuki Sekiya (ICRR)

IPMU_Neutrino20190409_sekiya_pub.pdf

11:30 Physics with DUNE

Speaker: Robert Svoboda (UC Davis)

Svoboda_DUNE_IPMU_201904.pdf

12:15 → 13:30 Lunch

13:30 → 15:00 Prospects of Neutrino Physics: Afternoon 1 (Chair: Kenzo Nakamura)

13:30 Physics with T2HK

Speaker: Megan Friend (KEK)

HKLBL_prospects_mfriend.pdf

14:00 Physics with T2HKK

Speaker: Seon-Hee Seo (IBS)

Seo_T2HKK_IPMU_20190409.pdf

14:30 SK results on Atmospheric Neutrinos and Prospects with HK

Speaker: Roger Wendell (Kyoto U.)

wendell_skatm_prospects_201904_upload.pdf

15:00 → 15:30 Break

15:30 → 16:30 Prospects of Neutrino Physics: Afternoon 2 (Chair: Kimihiro Okumura)

15:30 SK Results on Solar Neutrino and Prospects with HK

Speaker: Yasuo Takeuchi (Kobe U./Kavli IPMU)

ipmu2019-takeuchi-web.pdf

16:00 Results on Proton Decay from SK and Prospects with HK

Speaker: Hidekazu Tanaka (ICRR)

tanaka_20190409_prospects_nu_phys_v1.pdf

16:30 → 16:45 Break

16:45 → 17:25 Prospects of Neutrino Physics: Presentations by Young Researchers (Chair: Michihisa Takeuchi)

16:45 Tomography by neutrino pair beam

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

20190409_okui_IPMU.pdf

17:05 Testing right handed neutrinos at the linear collider

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

Das_Prospect_Neut_2019.pdf

Wednesday 10 April

09:00 → 10:30 Prospects of Neutrino Physics: Morning 1 (Chair: Morimitsu Tanimoto)

09:00 The Modular Invariance Approach to Neutrino Masses, Mixings and Flavor Problem"

Speaker: Feruccio Feruglio (U. Padova)

Feruglio_IPMUv2.pdf

09:30 nuMSM and Leptogenesis

Speaker: Takehiko Asaka (Niigata U.)

20190410_asaka_submit_IPMU.pdf

10:00 bb0nu Decay Searches: Current Status and Prospects

Speaker: Kunio Inoue (Tohoku U.)

IPMU20190410.pdf

10:30 → 11:00 Break

11:00 → 12:30 Prospects of Neutrino Physics: Morning 2 (Chair: Eligio Lisi)

11:00 Theory of bb0nu Decay: Elementary Particle Physics Aspects

Speaker: Werner Rodejohann (MPI Heidelberg)

Rodejohann_IPMU.pdf

11:30 Theory of bb0nu-Decay: Nuclear Physics Aspects

Speaker: Jouni Suhonen (U. Jyvaskyla)

Tokyo-2019.pdf

12:00 Results and Prospects on Geo-Neutrinos

Speaker: Hiroko Watanabe (RCNS)

10April_HirokoWatanabe.pdf

Thursday 11 April

09:00 → 10:30 Prospects of Neutrino Physics: Morning 1 (Chair: Ferruccio Feruglio)

09:00 Leptogenesis and Low-Energy Leptonic CP Violation

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)

NuPros_JessicTurner.pdf

09:30 The Neutrino Option

Speaker: Michael Trott (Niels Bohr Inst. Copenhagen U.)

IPMUSMEFTneutrino.pdf

10:00 Status and Prospects of eV Sterile Neutrinos

Speaker: Ivan Martinez-Soler (Fermilab/Northwestern U.)

Talk_Ivan.pdf

10:30 → 11:00 Break

11:00 → 12:30 Prospects of Neutrino Physics: Morning 2 (Chair: Robert Svoboda)

11:00 Physics Potential of JUNO

Speaker: He Miao (IHEP)

hem_190411_juno.pdf

11:30 Physics with ORCA

Speaker: Jannik Hofestaedt (FAU)

0JHofestaedt_ORCA_ProspectsNeutrinoWorkshop_ Kashiwa.pdf

12:00 Physics with Indian Neutrino Observatory

Speaker: Sanjib Kumar Agarwalla (Bubaneswar/HBNI/ICTP)

Sanjib-INO-Japan-2019.pdf

12:30 → 13:30 Lunch

13:30 → 15:00 Prospects of Neutrino Physics: Afternoon 1 (Chair: Masahiro Ibe)

13:30 Experimental prospects of Charged Lepton Flavor Violation

Speaker: Yoshihito Kuno (Osaka U.)

IPMU-Neutrino-KUNO.pdf

14:00 Predictions of Neutrino Mass Models for Charged Lepton Flavour Violation

Speaker: Lorenzo Calibbi (ITP-CAS)

calibbi-IPMU.pdf

14:30 Sign of CP violating phases in neutrinos and quarks

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.)

Neutrino-prospect2019.pdf

15:00 → 15:30 Break

15:30 → 16:50 Prospects of Neutrino Physics: Presentations by Young Researchers (Chair: Satoshi Shirai)

15:30 Leptogenesis from active neutrino oscillation

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

IPMU.pdf

15:50 Resonant leptogenesis at TeV-scale and neutrinoless double beta decay

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

20190411_yoshida_IPMU.pdf

16:10 General SU(N) Scotogenic (non-)Supersymmetric and CFT Models

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

SUN_susy_cft_mnu_opopo001.pdf

16:30 Higgs parity, SO(10) Unification and future colliders

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

2019IPMU.pdf

Friday 12 April

09:00 → 10:30 Prospects of Neutrino Physics: Morning 1 (Chair: Jessica Turner)

09:00 "Theory of Neutrino Oscillations in Matter for T2K, NovA, T2HK, T2HKK and DUNE"

Speaker: Sanjib Kumar Agarwalla (Bubaneswar/HBNI/ICTP)

Sanjib-LBL-Japan-2019.pdf

09:30 Proton decay (Theory)

Speaker: Natsumi Nagata (U. Tokyo)

20190412.pdf

10:00 Testing Seesaw with Gravitational Waves

Speaker: Hitoshi Murayama (UC Berkeley/Kavli IPMU)

seesaw.pdf

10:30 → 11:00 Break

11:00 → 12:30 Prospects of Neutrino Physics: Morning 2 (Chair: Shao-Feng Ge)

11:00 Status and Prospects of NSI

Speaker: Danny Marfatia (Hawaii U.)

IPMU.pdf

11:30 Muon decay at rest for CP measurement

Speaker: Jarah Evslin (Institute of Modern Physics, CAS)

IPMU2019.pdf

12:00 Exotic Physics Searches at Neutrino Detectors

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)

IPMU-Neutrino-Workshop-Talk.pdf

12:30 → 13:30 Lunch

13:30 → 15:00 Prospects of Neutrino Physics: Afternoon 1 (Chair: Jouni Suhonen)

13:30 Neutrino Trident Production

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.)

MHostert.pdf

14:00 Direct Detection Prospects for the Cosmic Neutrino Background

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)

IPMU_Spinrath.pdf

14:30 Coherent Scattering Results and Future Prospects

Speaker: Matthieu Vivier (IRFU, Saclay)

CEvNS_review_talk_final.pdf

15:00 → 15:30 Break

15:30 → 16:15 Prospects of Neutrino Physics: Afternoon 2 (Chair: Shigeki Matsumoto)

15:30 Particle Physics Prospects of Neutrino Coherent Scattering

Speaker: Joel Walker (Sam Houston State U.)

CEvNS_IPMU.pdf

16:00 Closing talk

Speaker: Serguey Petcov/Shigeki Matsumoto

Closing1.pdf