We study quantum entanglement and test violation of Bell-type inequality at the Circular Electron Positron Collider (CEPC), which is one most attractive future collides. It a promising particle collider designed to search new physics, make Standard Model (SM) precision measurements, serving as Higgs factory. Our based on fast simulation <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>Z</a:mi></a:math> boson pair production from decay <c:math...

Quantum entanglement is a cornerstone of quantum mechanics. While the confined electron pairs has been established early on, free-traveling pairs, particularly at high energies, remains largely unexplored due to substantial challenges involved in measuring spins electrons. In this study, we investigate and Bell inequality violation electron-positron generated fixed-target experiment. This experimental setup facilitates creation controllable source entangled where events are produced specific...

Multi-boson productions can be exploited as novel probes either for standard model precision tests or new physics searches, and have become one of those popular topics in the ongoing LHC experiments, future collider studies, including electron-positron muon-muon colliders. Here we focus on two examples, i.e., ZZZ direct through $\mu^{+}\mu^{-}$ annihilation at a 1 TeV muon collider, ZZ vector boson scattering 10 with an integrated luminosity $1-10 \, \text{ab}^{-1}$. Various channels are...

Abstract The phenomenon of neutrino oscillation is great theoretical and experimental interest for our understand the nature its implication physics beyond standard Model. Currently available experiments can already constrain mixing parameters with a confidence level up to 3 deviations ( σ ). However, it remains challenging provide deterministic constraint on Charge-Parity (CP) violation phase matrix. Here, we propose an setup that exploits collimated muon beams probe CP-violation. In...

A muon collider represents a promising candidate for the next generation of particle physics experiments after expected end LHC operations in early 2040s. Rare or hard-to-detect processes at LHC, such as production multiple gauge bosons, become accessible TeV collider. We present here prospects detecting quantum entanglement and violation Bell inequalities H to ZZ 4l events potential future show that spin density matrix Z boson pairs can be reconstructed using kinematics charged leptons from...

This work proposes a new yet economical experiment to probe the charged lepton flavor violation (CLFV) process mediated by an extra massive neutron gauge boson $Z^\prime$ beyond standard model, extending recently proposed muon dark matter project in Peking University Muon (PKMuon) Experiment. The devices used originally for light mass direct detection are easily adaptable search $\mu^+e^- \to \mu^+\mu^-$ CLFV leveraging large-area, high-precision tracking and tomography system sandwiching...

We study quantum entanglement and test violation of Bell-type inequality at the Circular Electron Positron Collider (CEPC), which is one most attractive future colliders. It's a promising particle collider designed to search new physics, make Standard Model (SM) precision measurements, serving as Higgs factory. Our based on fast simulation $Z$ boson pair production from decay $\sqrt{s} = 250$ GeV. The detector effects are also included in simulation. spin density matrix joint $ZZ$ system...

Entanglement is a fundamental pillar of quantum mechanics. Probing entanglement and testing Bell inequality with muons can be significant leap forward, as muon arguably the only massive elementary particle that manipulated detected over wide range energies, e.g., from approximately 0.3 to $10^2$ GeV, corresponding velocities 0.94 nearly speed light. In this work, we present realistic proposal comprehensive study in state composed different-flavor fermions muon-electron scattering. The...

We propose methods to produce energetic meson beams such as charged and neutral Kaons, which are boosted be collimated with relatively long life time. The first type of is based on asymmetric electron positron collisions a center mass energy of, e.g., 1020 MeV, Kaons can produced at rate $10^{4-5}/s$. either in energy, 10 GeV beam 26 MeV beam, or space, separated angle around 0.05 radius. Such proposals should able achieved reasonable budget. other method relying TeV target experiment, where...

We propose a new method to detect sub-GeV dark matter, through their scatterings from free leptons and the resulting kinematic shifts. Especially, such an experiment can matter interacting solely with muons. The proposed here is for directly probing muonphilic in model-independent way. Its complementarity muon on target proposal similar e.g. XENON/PandaX ATLAS/CMS searches. Moreover, our work better relatively heavy as those region. start small device of size around 0.1–1[Formula: see...

We propose a new method to detect sub-GeV dark matter, through their scatterings from free leptons and the resulting kinematic shifts. Specially, such an experiment can matter interacting solely with muons. The proposed here is directly probe muon-philic in model-independent way. Its complementarity muon on target proposal, similar to, e.g. XENON/PandaX ATLAS/CMS searches. Moreover, our proposal work better for relatively heavy as region. start small device of size around 0.1 1 meter, using...

We propose here a proposal to connect neutrino and energy frontiers, by exploiting collimated muon beams for oscillations, which generate symmetric antineutrino sources: $\mu^+\rightarrow e^+\,\bar{\nu}_{\mu}\, \nu_{e}$ $\mu^-\rightarrow e^-\, \nu_{\mu} \,\bar{\nu}_{e}$. Interfacing with long baseline detectors such as DUNE T2K, this experiment can be applicable measure tau properties, also probe CP phase, measuring electron (anti-)neutrino mixing or appearance, differences between rates....

We propose a new method to detect low-energy neutrinos and low-mass dark matter at or below the MeV scale, through their coherent scatterings from freely falling heavy atoms resulting kinematic shifts. start with simple calculation for illustration: $10^7$ of mass number around 100 small recoil energy 1 meV, corresponding velocities can reach $0.01, {\rm m/s}$ produce significant shifts that be detected. then show proposed device should able probe vast regions meV surpass previous limits on...

We reexamine the shapes of strange quark parton distribution functions (PDFs) proton by means quantum chromodynamics (QCD) analysis {\hera} deep inelastic scattering cross section measurement at DESY, and inclusive gauge boson production $W$ associated with a charm from LHC CERN. find that there is an overall agreement on distributions obtained CMS + ATLAS $W/Z$ data momentum fraction range $x \lesssim 10^{-2}$. Meanwhile, also strong tension between these towards large $x$. this fades away...