The 4th Workshop on New Physics Opportunities at Neutrino Facilities

3 Jun 2024, 08:30 → 5 Jun 2024, 18:00 Asia/Seoul

Science and Culture Center (IBS)

Seodong Shin (Jeonbuk National University)

The 4th Workshop on New Physics Opportunities at Neutrino Facilities (NPN 2024) will take place from June 3 (Mon) - 5 (Wed), 2024 at the Institute for Basic Science (IBS), Daejeon, Korea. This workshop series aims to bring together both theorists and experimentalists and actively discuss new opportunities at the current and next generation neutrino facilities in probing new physics beyond the Standard Model (BSM). 

This year, we focus on novel BSM theories, search strategies, and results from accelerator-based experiments as well as actively running neutrino experiments in Eastern Asian countries. Participation of early-career colleagues is encouraged with presentation opportunities and some travel support, subject to funding availability.

 

Abstract submission deadline: May 21 

Registration deadline: May 31 

The registration fee of 120 USD (150k KRW) should be paid via the "Registration Info." menu.

 

 

Invited Speakers

Pouya Bakhti (Jeonbuk National University)

Eung Jin Chun (KIAS)

Kazumi Hata (Tohoku University)

Yu Seon Jeong (Chung-Ang University)

Doojin Kim (Texas A&M University)

Youngju Ko (IBS-CUP)

Weijun Li (Oxford University)

Yufeng Li (IHEP)

Kenny C.Y. Ng (CUHK)

Jung Sic Park (Kyungpook National University)

Carsten Rott (Sungkyunkwan University / University of Utah)

Volodymyr Takhistov (KEK)

Eunil Won (Korea University)

Byoungsu Yang (Chonnam National University)

Jaehoon Yu (University of Texas, Arlington)

Seok Hoon Yun (IBS-CTPU)

 

 

 

Local Organizing Committee

Koun Choi (IBS-CUP)

Chang Hyon Ha (Chung-Ang University)

Hyun Su Lee (IBS-CUP)

Jong-Chul Park (Chungnam National University)

Jung Sic Park (Kyungpook National University)

Seodong Shin (Jeonbuk National University)

 

 

Program Committee

LOC members

Yusuke Koshio (Okayama University)

Meng-Ru Wu (Academia Sinica)

Shun Zhou (Institute of High Energy Physics)

 

 

Steering Committee

Brian Batell (University of Pittsburgh)

Andre Luiz De Gouvea (Northwestern University)

Jong-Chul Park (Chungnam National University)

Alexandre Sousa (University of Cincinnati)

Yun-Tse Tsai (SLAC)

Jaehoon Yu (University of Texas, Arlington)

 

 

Previous NPN Workshop Series

1st workshop at the University of Texas, Arlington

2nd workshop at the University of Pittsburgh

3rd workshop at SLAC

 

 

 

 

 

 

 

Monday, 3 June

09:00 → 09:20 Registration & Breakfast

09:20 → 09:40 Welcome remark

Convener: Prof. Seodong Shin (Jeonbuk National University)

09:30 Welcoming remark

Speaker: Prof. Seodong Shin (Jeonbuk National University)

NPN2024-opening.pdf

09:40 → 10:40 Plenary 1: New opportunities at accelerator experiments I

Convener: Prof. Seodong Shin (Jeonbuk National University)

09:40 Beyond the Standard Model Physics at DUNE

Precision measurements of neutrino properties necessary for modifying the Standard Model requires a unique combination of the high-intensity LBNF proton beams with a highly-capable precision DUNE near detector, and massive LArTPC far detector modules at a 1300 km baseline. This capability enables a variety of opportunities for Beyond the Standard Modem (BSM) physics, either novel or with unprecedented sensitivity which were impossible to conceive in traditional neutrino experiment. The near detector system is critical in controlling systematic uncertainties. The near detector plays an essential role in taking full advantage of the LBNF beam in most of the BSM physics topics. In this talk, I will discuss BSM physics topics DUNE can make contributions and will briefly summarize how DUNE can make leading contributions in this arena, taking advantage of the capable near detector.

Speaker: Jaehoon Yu (The University of Texas at Arlington)

Yu-NPN-060324.pptx

10:10 BSM Opportunities at Beam-Dump Experiments

In this talk, I will discuss various BSM opportunities available at beam-dump-type experiments including beam-produced neutrino experiments. Due to the weakly interacting nature of neutrinos, high-intensity beam-based experiments are well-motivated. Inside the beam target of these experiments, plenty of MeV-scale mesons and MeV-to-GeV scale electromagnetic particles such as electrons, positrons, and photons are produced and they can be good sources of MeV-range BSM physics. As concrete example studies, I will discuss MeV-scale light dark matter and light mediator searches in these experiments. I will then motivate very short baseline experiments in the context of mediator searches and introduce the concept of proposed "portable" DAMSA experiments.

Speaker: Dr Doojin Kim (Texas A&M University)

Presentation_DoojinKim.pptx

10:40 → 11:10 Coffee & Discussion

11:10 → 12:10 Plenary 2: New opportunities at atmospheric neutrino experiments I

Convener: Prof. Seodong Shin (Jeonbuk National University)

11:10 Dark Matter search in neutrino detectors

I will discuss the current status and future prospects of dark matter searches with neutrinos, and provide some thoughts on possible new ideas on this topic.

Speaker: Kenny Chun Yu Ng (The Chinese University of Hong Kong)

npn2024.pdf

11:40 BSM probes from stars

Stars can be used as a valuable source for investigating new physics beyond the Standard Model, particularly light and feebly-interacting particles such as axions and dark photons. Among the various types of stars, supernovae and the Sun could be one of the most relevant objects for these searches, given their neutrino signals detected in experiments. In this talk, I will provide an overview of some approaches to search for new physics beyond the Standard Model, as implied by neutrino detection from supernovae and the Sun.

Speaker: Seokhoon Yun (IBS-CTPU)

NPN2024_S.Yun_03.06.24.pdf

12:10 → 14:00 Lunch

14:00 → 15:00 Plenary 3: New opportunities at solar neutrino experiments

Convener: Pouya Bakhti (JBNU)

14:00 BSM in JUNO

Speaker: Yufeng Li (Institute of High Energy Physics)

JUNO-IBS.pptx

14:30 Liquid Scintillator Counter at Yemilab

In September 2022, a new underground laboratory, Yemilab, was finally completed in Jeongseon, Gangwon Province, with a depth of 1,000 m and an exclusive experimental area spanning 3,000 m^3. The tunnel is encased in limestone and accommodates 17 independent experimental spaces. Among
them, Yemilab includes a cylindrical pit with a volume of approximately 6,300 m^3, designed as a multipurpose laboratory for next-generation experiments involving neutrinos, dark matter, and related research.
We discuss physical potential and R&D strategy for a future program
at this site.

Speaker: Eunil Won (Korea University)

NPN_2024_Won.pdf

15:00 → 15:30 Coffee & Discussion

15:30 → 17:00 Plenary 4: Reactor neutrino experiments in East Asia

Convener: Dr hyunsu Lee (IBS)

15:30 BSM search in KamLAND

KamLAND-Zen is an experiment that searches for neutrino less double-beta decay of 136Xe with xenon loaded liquid scintillator.
Other BSM searches in KamLAND include the emission of majoron in neutrino less double-beta decay and the excited states of dark matter.
In this talk, I will talk these three BSM searches in KamLAND.

Speaker: Kazumi Hata (Tohoku University)

NPN2024_KazumiHata.pdf

16:00 Status of RENE

Speaker: Prof. Byoungsu Yang (Chonnam National University)

ByeongsuYang_RENE_NPN2024.pdf

16:30 Status of NEON and NEOS

Nuclear reactors produce a huge amount of neutrinos from the beta decay that occurs during fission. An excellent detection channel for electron antineutrinos, called inverse beta decay, has led to numerous neutrino experiments using reactor neutrino. The Hanbit Nuclear Power Plant in Yeonggwang has six units with a thermal power of 2.8 GW, and each unit has a Tendon Gallery that is accessible 24 meters away from the reactor core. NEOS had been conducted an experiment in the Tendon Gallery from 2015 to search for sterile neutrinos, one hypothesis to explain the reactor antineutrino anomaly. Meanwhile, the combined experience of NEOS and COSINE, an underground experiment to search for dark matter, has led to attempts to observe coherent elastic neutrino-nucleus scattering, and the NEON collaboration was formed to conduct the experiment at the Tendon Gallery. As well as neutrinos, nuclear reactors are also very rich gamma sources, and NEON has carried out a search for dark sector particles that can be produced from nuclear gamma. This talk will include an overview of both experiments and recent results.

Speaker: Young Ju Ko (IBS)

20240603_yjko.pdf

17:00 → 18:00 Discussion

18:00 → 20:00 Dinner

Convener: Koun Choi (IBS)

dining place.pdf

Tuesday, 4 June

09:00 → 09:30 Breakfast

09:30 → 11:00 Plenary 5: New opportunities at accelerator experiments II

Convener: Jong-Chul Park (Chungnam National University)

09:30 BSM at T2SK/HK near detectors

Speaker: Mr Weijun Li (Oxford University)

Exotic Search at T2K.pptx

10:00 Status of the JSNS2 experiment

The JSNS2 experiment is formulated to investigate sterile neutrinos while also aiming to directly verify the LSND experiment's results as a primary objective in physics. The approach involves utilizing muon decay-at-rest neutrinos and observing the appearance of anti-electron neutrinos at the J-PARC Material and Life Science Facility. The neutrino target comprises 17 tonnes of gadolinium-loaded liquid scintillator combined with 10 percent diisopropylnaphthalene (DIPN), surrounded by 31 tonnes of unloaded liquid scintillator that includes gamma-catcher and veto layers. This presentation offers a brief overview of the potential opportunities for exploring Beyond Standard Model (BSM) physics using the JSNS2 detector, along with the current status of the experiment.

Speaker: Jungsic Park (Kyungpook National University)

NPN_jspark.pdf

10:30 Search for BSM physics at the forward experiments of the LHC

At the LHC, new experiments, SND@LHC and FASER/FASER\nu, have started to investigate neutrinos and BSM physics in the forward region of the beam collision point. In addition, the Forward Physics Facility (FPF) was proposed to house a suite of forwad experiments in the High Luminosity stage (HL-LHC). These experiments can provide opportunities to search for many interesting physics potentials in the standard model and beyond the standard model (BSM). In this talk, I will introduce several physics cases that can be explored at such forward experiments of the LHC focusing on BSM physics.

Speaker: Yu Seon Jeong

NPN2024-ysjeong-v2.pdf

11:00 → 11:30 Coffee & Discussion

11:30 → 12:30 Plenary 6: New opportunities at atmospheric neutrino experiments II

Convener: Koun Choi (IBS)

11:30 BSM at SK/HK far detectors

Speaker: Volodymyr Takhistov (QUP, KEK & Kavli IPMU)

BSM_SKHK_Takhistov.pdf

12:00 BSM at IceCube

Speaker: Carsten Rott (Sungkyunkwan University)

Rott_NPN_2024_BSM_IceCube.pdf

12:30 → 14:00 Lunch

14:00 → 15:00 Plenary7: New ideas on neutrino related BSM

Convener: Dr Doojin Kim (Texas A&M University)

14:00 Neutrion mass models: Seesaw and DM

I will sketch several ideas on neutrino mass models associated with dark matter of the Universe, each of which based on the feature of Dodelson-Widrow mechanism, scotogenic model and neutrion-portal scheme.

Speaker: Eung Jin Chun (KIAS)

240604-SeesawDM-NPN.pdf

14:30 Effects of NSI on neutrino oscillation parameters measurements

In this talk I will discuss Non-Standard neutrino Interaction (NSI) at its effect on neutrino oscillation parameters. I will explain the LMA-Dark solution, degeneracies induced by NSI of $\delta_{CP}$ measurement. Moreover, I will discuss the effect of NSI on solar and atmospheric neutrinos.

Speaker: Pouya Bakhti (JBNU)

NPN_NSI.pdf

15:00 → 15:05 Conference photo

15:05 → 15:20 Coffee & Discussion

15:20 → 17:20 Contributed talks I

Convener: Seokhoon Yun (IBS-CTPU)

15:20 Analyzing light sterile neutrino at DUNE and the role of beam tune, neutral current and near detector

The Deep Underground Neutrino Experiment (DUNE) is an upcoming long baseline neutrino experiment. In addition to exploring the yet unknown parameters in the standard three flavor neutrino sector, an ancilliary goal of DUNE is to probe the subdominant effects induced by new physics such as a light eV-scale sterile neutrino. DUNE utilizes a wide band beam and provides us with an opportunity to utilize different beam tunes. We demonstrate that combining information from different beam tunes (low energy and medium energy) available at DUNE impacts its ability to probe some of the sterile parameters and modifies the allowed regions. We also perform a comparative analysis with different configurations including the addition of neutral current channels and using the simulated near detector data. We illustrate how using these various configurations can help us in exploring the sterile neutrino parameter space.

Speaker: Mehedi Masud (IBS-CTPU)

slides_masud_npn_2024.pdf

15:40 N_eff constraints on the Dark Axion Portal

Axions and dark photons are common in many extensions of the Standard Model. The dark axion portal—an axion coupling to the dark photon and photon—can significantly modify their phenomenology. We study the cosmological constraints on the dark axion portal from Cosmic Microwave Background (CMB) bounds on the energy density of dark radiation, $\Delta N_{eff}$. By computing the axion-photon-dark photon collision terms and solving the Boltzmann equations including their effects, we find that light axions are generally more constrained by $\Delta N_{eff}$ than from supernova cooling or collider experiments. However, with dark photons at the MeV scale, a window of parameter space is opened up above the supernova limits and below the experimental exclusion, allowing for axion decay constants as low as $f_a \sim 10^4$ GeV. This region also modifies indirectly the neutrino energy density, thus relaxing the cosmological upper bound on the sum of ne

Speaker: Heejoung Hong

Neff_NPN2024.pdf

16:00 Reactor antineutrino flux from neutrino-13C neutral current interactions

We focus on the potential of neutrino - 13C neutral current interactions in clarifying the reactor antineutrino flux around the 6 MeV region. The interactions produce 3.685 MeV photon line via the process of de-excitation of 13C in organic liquid scintillators, which can be observed in reactor neutrino experiments. We expect the future measurements of neutrino - 13C cross section in JUNO and IsoDAR@Yemilab at low energies might help testing the reactor flux models with the assistance of excellent particle identification.

Speaker: Min-Gwa Park (Jeonbuk National University)

NPN2024.pdf

16:20 Searching for $\nu_\tau$ disappearance in the SHiP experiment

We study the expected sensitivity to the mixing between sterile and tau neutrinos directly from the tau neutrino disappearance in the high-energy fixed target experiment. Here, the beam energy is large enough to produce tau neutrinos at the target with large luminosity. During their propagation to the detector, the tau neutrino may oscillate into sterile neutrino. By examining the energy spectrum of the observed tau neutrino events, we can probe the mixing between sterile and tau neutrinos directly. In this paper, we consider Scattering and Neutrino Detector (SND) at SHiP experiment as a showcase, which uses 400 GeV protons from SPS at CERN, and expect to observe 6,300 tau and anti-tau neutrinos from the $2\times 10^{20}$ POT for 5 years operation. Assuming the uncertainty of 10\%, we find the sensitivity $|U_{\tau 4}|^2 \sim 0.08$\, (90\% CL) for $\Delta m_{41}^2 \sim 500\ \mathrm{eV}^2$ with 10\% signal-to-background ratio. We also consider a far SND at the end of the SHiP Hidden Sector Decay Spectrometer (HSDS), in which case the sensitivity would be enhanced to $|U_{\tau 4}|^2 \sim 0.02$. Away from this mass, the sensitivity becomes lower than $|U_{\tau 4}|^2 \sim 0.15$ for $\Delta m_{41}^2 \lesssim 100\ \mathrm{eV}^2$ or $\Delta m_{41}^2\gtrsim 10^4 \mathrm{eV}^2$.

Speaker: Seong Moon Yoo (Sung Kyun Kwan University)

NPN_2024_SMY.pdf

16:40 Physics at the SND@LHC

We review the physics at the SND@LHC and its recent achievements.

Speaker: Ki-Young Choi (Sungkyunkwan University)

SND@LHC_NPN.pdf

17:00 BeamHNL, a GENIE-based general heavy neutral lepton generator

Heavy Neutral Leptons (HNL) are a compelling target for discovery searches at accelerator experiments. The GENIE BeamHNL module is an experiment-agnostic, configurable simulation of HNL produced in the decays of particles that are made in neutrino beamlines. Applicable to HNL with mass less than the kaon's mass, BeamHNL produces a detailed record of decay events in an arbitrarily complex detector at a user-specified location, by calculating the neutrino energy and acceptance probability event-by-event. It accepts flexible user input in the form of flat flux tuples, a ROOT geometry file, and a configuration file where desired decay channels (implemented from an effective field theory valid at Intensity Frontier neutrino energies) are specified. Deliverables include a dynamic flux calculation, HNL decay timing distributions for background reduction, an implementation of HNL polarisation, and a robust distribution of decay vertices in 3D space according to the position and size of the supplied detector.

Speaker: Weijun Li (University of Oxford)

BeamHNL_NPN2024.pdf

17:20 → 18:10 White paper discussion

Convener: Jaehoon Yu (The University of Texas at Arlington)

White-paper-NPN2024-final.pptx

18:10 → 21:10 Banquet

Wednesday, 5 June

09:00 → 09:30 Breakfast

09:30 → 10:30 Contributed talks II

Convener: Prof. Seodong Shin (Jeonbuk National University)

09:30 Halo-independent bounds on Inelastic Dark Matter

I will discuss halo-independent constraints on the Inelastic Dark Matter (IDM) scenario, in which a Weakly Interaction Massive Particle (WIMP) state interacts with nuclear targets by upscattering to a heavier state with a mass splitting δ. Such constraints are obtained adopting the single-stream method, that exploits the complementarity of Direct Detections and Neutrino Telescopes (searching for the annihilation signal of WIMPs captured in the Sun) in probing the full range of incoming WIMP speeds. I will show that a non-vanishing mass splitting δ modifies this picture, and that for particular combinations of WIMP mass and δ the complementarity between the two detection techniques required by the method is lost. I will also discuss the issue of thermalization of IDM within the Sun and show the corresponding effect on our results.

Speaker: Dr Arpan Kar (CQUeST, Sogang University)

AKar_NPN24.pdf

09:50 DM searches using SK LOWE data

I will cover what is not covered by the plenary talk, focusing on low-energy data

Speaker: Koun Choi (IBS)

240605_koun_NPN.pdf

10:10 Secret neutrino interaction at rare meson decay and neutrino experiments

Secret coupling of neutrinos to a new light vector boson, Z′, with a mass smaller than few hundred MeV is motivated within a several scenarios which are designed to explain various anomalies in particle physics and cosmology. Due to the longitudinal component of the massive vector boson, the rates of three-body decay of charged mesons (M) such as the pion, kaon and D mesons to the light lepton plus neutrino and $Z'$ ($M \to l\nu Z'$) are enhanced by a factor of ($m_M/m_{Z'})^2$ and followed by the subsequent decay of $Z'$ into the pair of neutrino and anti-neutrino. On the other hand, the standard two body decay $M\to l\nu$ is suppressed by a factor of $(m_l/m_M)$2 due to chirality.
Consequently, this new interaction can be examined through meson decay experiments, involving the detection of the charged lepton, and in neutrino experiments, which change the neutrino spectrum. The strongest current bound comes from kaon decay experiment the NA62 experiment. We investigate the potential of future neutrino experiments for identifying specifically $\nu_\tau$ appearance in probing secret neutrino interactions.

Speaker: Pouya Bakhti (JBNU)

NPN_SI.pdf

10:30 → 11:00 Coffee & Discussion

11:00 → 11:10 NPN 2025 Announcement

Convener: Alexandre Sousa

Sousa_NPN2025_Cincinnati.pdf

11:10 → 12:10 White paper discussion II

Convener: Jaehoon Yu (The University of Texas at Arlington)

12:10 → 12:20 Closing remark

Convener: Prof. Jong-Chul Park (Chungnam National University)

12:20 → 14:00 Lunch

14:00 → 16:00 Discussion