在NuMI束流中使用MicroBooNE探测器搜索Higgs-portal标量玻色子的生产

Exploring Portals to a Hidden Sector Through Fixed Targets

We discuss the sensitivity of neutrino experiments at the luminosity frontier to generic hidden sectors containing new (sub)-GeV neutral states. The weak interaction of these states with the Standard Model can be efficiently probed through all of the allowed renormalizable `portals' (in the Higgs, vector, and neutrino sectors) at fixed target proton beam facilities, with complementary sensitivity to colliders. We concentrate on the kinetic-mixing vector portal, and show that certain regions of the parameter space for a new secluded U(1) gauge sector with long-lived sub-GeV mass states decaying…

Heavy neutral leptons below the kaon mass at hodoscopic detectors

Heavy neutral leptons ($N$) below the kaon mass are severely constrained by cosmology and lab-based searches for their decays in flight. If $N$ interacts via an additional force, $N\toνe^+e^-$ decays are enhanced and cosmological limits can be avoided. We show that the T2K and MicroBooNE neutrino experiments provide the best limits on the mixing of $N$ with muon-neutrinos, outperforming past-generation experiments, previously thought to dominate. We constrain models with electromagnetically-decaying and long-lived $N$, such as in a transition-magnetic-moment portal and in a leptophilic axion-l…

Search for a Higgs portal scalar decaying to electron-positron pairs in the MicroBooNE detector

We present a search for the decays of a neutral scalar boson produced by kaons decaying at rest, in the context of the Higgs portal model, using the MicroBooNE detector. We analyze data triggered in time with the Fermilab NuMI neutrino beam spill, with an exposure of $1.93\times10^{20}$ protons on target. We look for monoenergetic scalars that come from the direction of the NuMI hadron absorber, at a distance of 100 m from the detector, and decay to electron-positron pairs. We observe one candidate event, with a Standard Model background prediction of $1.9\pm0.8$. We set an upper limit on the …

在CCM实验中检验MiniBooNE异常的介子门户暗区解决方案

Testing Meson Portal Dark Sector Solutions to the MiniBooNE Anomaly at CCM

本文研究通过带电介子三体衰变和中性介子二体反常衰变产生长寿命粒子的暗区模型来解释MiniBooNE超出，验证其与LSND、KARMEN、MicroBooNE约束的相容性，并评估CCM实验的发现灵敏度。

利用MicroBooNE探测器首次测量氩上$ν_e$ + $\barν_e$带电电流单带电π产生微分截面

First measurement of $ν_e$ + $\barν_e$ charged current single charged pion production differential cross sections on argon using the MicroBooNE detector

利用MicroBooNE探测器首次测量氩上电子中微子带电电流单π产生截面，给出总截面和微分截面，为振荡测量和新物理搜索提供关键数据。

Dark Tridents at Off-Axis Liquid Argon Neutrino Detectors

We present dark tridents, a new channel for exploring dark sectors in short-baseline neutrino experiments. Dark tridents are clean, distinct events where, like neutrino tridents, the scattering of a very weakly coupled particle leads to the production of a lepton--antilepton pair. Dark trident production occurs in models where long-lived dark-sector particles are produced along with the neutrinos in a beam-dump environment and interact with neutrino detectors downstream, producing an on-shell boson which decays into a pair of charged leptons. We focus on a simple model where the dark matter pa…

Dark matter beams at LBNF

High-intensity neutrino beam facilities may produce a beam of light dark matter when protons strike the target. Searches for such a dark matter beam using its scattering in a nearby detector must overcome the large neutrino background. We characterize the spatial and energy distributions of the dark matter and neutrino beams, focusing on their differences to enhance the sensitivity to dark matter. We find that a dark matter beam produced by a $Z'$ boson in the GeV mass range is both broader and more energetic than the neutrino beam. The reach for dark matter is maximized for a detector sensiti…

利用MicroBooNE探测器在电子-正电子和中性π介子末态中搜寻重中性轻子

Search for heavy neutral leptons in electron-positron and neutral-pion final states with the MicroBooNE detector

本文利用MicroBooNE液氩时间投影室数据首次搜寻衰变为νe⁺e⁻和νπ⁰末态的重中性轻子，在90%置信水平上对混合参数|U_μ4|²设定了迄今最严格的上限，并首次给出νπ⁰衰变道的直接搜寻约束。

利用NOvA近探测器搜索加速器产生的亚GeV暗物质

Search for Accelerator-Produced Sub-GeV Dark Matter with the NOvA Near Detector

本研究利用费米实验室NuMI设施的中微子束，通过NOvA近探测器搜索1-200 MeV的亚GeV暗物质，基于2.55×10^21质子曝光量设定了暗-可见耦合限制，其中10-20 MeV质量范围的约束为目前最严格。

在 ICARUS 上通过双缪子末态寻找来自 K 介子衰变的隐藏区标量粒子

Search for a Hidden Sector Scalar from Kaon Decay in the Di-Muon Final State at ICARUS

本研究利用 ICARUS 的 NuMI 数据寻找 K 介子衰变产生并在探测器内衰变为双缪子的隐藏区长寿命标量，未发现信号，给出重 QCD 轴子、Higgs portal 标量及模型无关限制。