We investigate the potential of future data from next generation long-baseline neutrino experiments, DUNE and T2HK and the upcoming reactor experiment JUNO in constraining neutral current nonstandard ...neutrino interactions (NSI) parameters. JUNO is going to provide the most precise measurements of solar neutrino oscillation parameters as well as determining the neutrino mass ordering. We study how the results of JUNO combined with those of long-baseline neutrino experiments such as DUNE and T2HK can help to determine oscillation parameters and constrain NSI parameters. We present excluded regions in NSI parameter space, εαβ assuming Standard Model (SM) as the null hypothesis. We further explore the correlations between the NSI parameters and the CP -violation phase.
We study the matter effect caused by nonstandard neutrino interactions (NSI) in the future solar neutrino experiments, DUNE, HK, and MICA. The upcoming reactor experiment, JUNO is expected to provide ...the most precise measurements of solar neutrino oscillation parameters and is going to open up the era of subpercent precision in the leptonic mixing sector of the Standard Model (SM). Assuming JUNO can measure Δm221 and Θ12 by subpercent precision and assuming SM as the null hypothesis, we study the possibility to constrain NSI parameters by the future solar neutrino experiments such as DUNE, HK and MICA and present excluded region in NSI parameter space, εN and εD. For this purpose, we study the effect of NSI on solar neutrino propagation in the Sun and Earth and explore the dependence of the day-night asymmetry on the NSI parameters. we also study the effect of NSI at the detector on the simulated data for these experiments.
We investigate the potential of future tau neutrino experiments for identifying the ν τ appearance in probing secret neutrino interactions, which is very important in a variety of fields, such as ...neutrino physics, dark matter physics, grand unified theories, astrophysics, and cosmology. The reference experiments include the DUNE far detector utilizing the atmospheric data, which is for the first time probing secret interactions, the Forward Liquid Argon Experiment (FLArE100) detector at the Forward Physics Facility, and emulsion detector experiments such as SND@LHC, FASER ν , AdvSND, FASER ν 2 , and SND@SHiP. For concreteness, we consider a reference scenario in which the hidden interactions among the neutrinos are mediated by a single light gauge boson Z ′ with a mass at most below the sub-GeV scale and an interaction strength g α β between the active neutrinos ν α and ν β . We confirm that these experiments have the capability to significantly enhance the current sensitivities on g α β for m Z ′ ≲ 500 MeV due to the production of high-energy neutrinos and excellent ability to detect tau neutrinos. Our analysis highlights the crucial role of “downward-going” DUNE atmospheric data in the search for secret neutrino interactions because of the rejection of backgrounds dominated in the upward-going events. Specifically, ten years of DUNE atmospheric data can provide the best sensitivities on g e τ and g μ τ which are about 2 orders of magnitude improvement. In addition, the beam-based experiments such as FLArE100 and FASER ν 2 can improve the current constraint on g e τ and g μ τ by more than an order of magnitude after the full running of the high luminosity LHC with the integrated luminosity of 3 ab − 1 . For g e μ and g e e the SHiP experiment can play the most important role in the high-energy region of m Z ′ > few 100 MeV , and FLArE100 and FASER ν 2 can set the most stringent constraints for m Z ′ less than few keV, in particular, if atmospheric flux uncertainty reduces DUNE sensitivity. Although our analysis is proceeded under our reference scenario of secret Z ′ , our analysis strategies can be readily applicable to other types of secret interactions such as Majoron models. Published by the American Physical Society 2024
We investigate the sensitivities of the liquid scintillator counter (LSC) at Yemilab and JUNO to solar neutrino oscillation parameters, focusing on θ 12 and Δ m 21 2 . We compare the potential of ...JUNO with LSC at Yemilab utilizing both reactor and solar data in determining those parameters. We find that the solar neutrino data of LSC at Yemilab is highly sensitive to θ 12 enabling its determination with a higher precision compared to reactor experiments. Our study also reveals that if Δ m 21 2 is larger, with a value close to the best-fit value of KamLAND, JUNO reactor data will have about two times better precision than the reactor LSC at Yemilab. On the other hand, if Δ m 21 2 is smaller and closer to the best-fit value of solar neutrino experiments, the precision of the reactor LSC at Yemilab will be better than JUNO. Published by the American Physical Society 2024
The positron excess observed by PAMELA and then confirmed by AMS-02 has intrigued the particle physics community since 2008. Various dark matter decay and annihilation models have been built to ...explain the excess. However, the bounds from isotropic gamma ray disfavor the canonical dark matter decay scenario. We propose a solution to this excess based on the decay of dark matter particles into intermediate millicharged particles which can be trapped by the galactic magnetic field. The subsequent decay of the millicharged particles to electron positron in our vicinity can explain the excess. Since these particles diffuse out of the halo before decay, their contribution to the isotropic gamma ray background is expected to be much smaller than that in the canonic dark matter decay scenarios. We show that the model is testable by direct dark matter search experiments.
There is a robust signal for a 511 keV photon line from the galactic center which may originate from dark matter particles with masses of a few MeV. To avoid the bounds from delayed recombination and ...from the absence of the line from dwarf galaxies, in 2017, we have proposed a model in which dark matter first decays into a pair of intermediate pico-charged particles \(C\bar{C}\) with a lifetime much larger than the age of the universe. The galactic magnetic field accumulates the relativistic \(C\bar{C}\) that eventually annihilate, producing the \(e^-e^+\) pair that give rise to the 511 keV line. The relativistic pico-charged \(C\) particles can scatter on the electrons inside the direct dark matter search detectors imparting a recoil energy of \(E_r \sim\)~keV. We show that this model can account for the electron recoil excess recently reported by the XENON1T experiment. Moreover, we show that the XENON1T electron recoil data sets the most stringent bound on the lifetime of the dark matter within this model.
We investigate the potential of the next generation long-baseline neutrino experiments DUNE and T2HK as well as the upcoming reactor experiment JUNO to constrain Non-Standard Interaction (NSI) ...parameters. JUNO is going to provide the most precise measurements of solar neutrino oscillation parameters as well as determining the neutrino mass ordering. We study how the results of JUNO combined with those of long-baseline neutrino experiments such as DUNE and T2HK can help to determine oscillation parameters and to constrain NSI parameters. We present excluded regions in NSI parameter space, \(\epsilon_{\alpha \beta}\) assuming Standard Model (SM) as the null hypothesis. We further explore the correlations between the NSI parameters and CP-violation phase.
We investigate the potential of future tau neutrino experiments for identifying the \(\nu_\tau\) appearance in probing secret neutrino interactions. The reference experiments include the DUNE far ...detector utilizing the atmospheric data, which is for the first time in probing the secret interactions, the Forward Liquid Argon Experiment (FLArE100) detector at the Forward Physics Facility (FPF), and emulsion detector experiments such as SND@LHC, AdvSND, FASER\(\nu\)2, and SND@SHiP. For concreteness, we consider a reference scenario in which the hidden interactions among the neutrinos are mediated by a single light gauge boson \(Z'\) with a mass at most below the sub-GeV scale and an interaction strength \(g_{\alpha \beta}\) between the active neutrinos. We confirm that these experiments have the capability to significantly enhance the current sensitivities on \(g_{\alpha \beta }\) for \(m_{Z'} \lesssim 500\) MeV due to the production of high energy neutrinos and excellent ability to detect tau neutrinos. Our analysis highlights the crucial role of downward-going DUNE atmospheric data in the search for secret neutrino interactions because of the rejection of backgrounds dominated in the upward-going events. Specifically, 10 years of DUNE atmospheric data can provide the best sensitivities on \(g_{\alpha \beta}\) which is about two orders of magnitude improvement. In addition, the beam-based experiments such as FLArE100 and FASER\(\nu\)2 can improve the current constraint on \(g_{e\tau}\) and \(g_{\mu\tau}\) by more than an order of magnitude after the full running of the high luminosity LHC with the integrated luminosity of 3 ab\(^{-1}\). For \(g_{e\mu}\) and \(g_{ee}\) the SHiP experiment can play the most important role in the high energy region of \(E> few~100\) MeV.
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