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Study of charged Lepton Flavor Violation in electron muon interactions
High Energy Physics - Experiment · Submitted 15 May 2024
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Compared with current and prospective limits set by other experiments, electron muon interactions demonstrate significant advantages in the cLFV coupling strength sensitivity with tau in the final states.
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The abstract, sentence by sentence
With the improvement of muon acceleration technology, it has received great interest to exploit high-energy muon beams for collision or target experiments. We investigate possible charged Lepton Flavor Violation (cLFV) processes mediated by an extra massive neutral gauge boson Zprime in electron muon interactions, either at a proposed electron muon collider or in a fixed target experiment with high-energy muon beam hitting electrons in the target. Based on Monte Carlo calculations and fast detector simulations, we study in detail our signal and possible backgrounds, giving the sensitivity results of cLFV signals at the 90% confidence level. Compared with current and prospective limits set by other experiments, electron muon interactions demonstrate significant advantages in the cLFV coupling strength sensitivity with tau in the final states. In addition, a special cLFV coupling combination, lambda_emu * lambda_mumu, can also be probed in our proposal.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | With the improvement of muon acceleration technology, it has received great interest to exploit high-energy muon beams for collision or target experiments. | background 1.00 | 0.05 | 0.02 | asserted 0.99 |
| s1 | We investigate possible charged Lepton Flavor Violation (cLFV) processes mediated by an extra massive neutral gauge boson Zprime in electron muon interactions, either at a proposed electron muon collider or in a fixed target experiment with high-energy muon beam hitting electrons in the target. | contribution 1.00 | 0.81 | 0.06 | hedged possibility 0.73 |
| s2 | Based on Monte Carlo calculations and fast detector simulations, we study in detail our signal and possible backgrounds, giving the sensitivity results of cLFV signals at the 90% confidence level. | method 0.91 | 0.95 | 0.08 | asserted 0.98 |
| s3 | Compared with current and prospective limits set by other experiments, electron muon interactions demonstrate significant advantages in the cLFV coupling strength sensitivity with tau in the final states. | result 0.50 | 0.73 | 0.65 | asserted 1.00 |
| s4 | In addition, a special cLFV coupling combination, lambda_emu * lambda_mumu, can also be probed in our proposal. | contribution 0.56 | 0.80 | 0.09 | hedged possibility 0.58 |
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The paper
Original abstract
With the improvement of muon acceleration technology, it has received great interest to exploit high-energy muon beams for collision or target experiments. We investigate possible charged Lepton Flavor Violation (cLFV) processes mediated by an extra massive neutral gauge boson Zprime in electron muon interactions, either at a proposed electron muon collider or in a fixed target experiment with high-energy muon beam hitting electrons in the target. Based on Monte Carlo calculations and fast detector simulations, we study in detail our signal and possible backgrounds, giving the sensitivity results of cLFV signals at the 90% confidence level. Compared with current and prospective limits set by other experiments, electron muon interactions demonstrate significant advantages in the cLFV coupling strength sensitivity with tau in the final states. In addition, a special cLFV coupling combination, lambda_emu * lambda_mumu, can also be probed in our proposal.
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References
How the literature uses it
4 arXiv papers cite this in 4 sentences
What it cites · 12 sentences without a confident label
Uses the method or tool of 5 papers
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The test statistics $Z_i$ is calculated by $Z_i := 2[n_i - b_i +b_i ln(n_i / b_i)]$ for 90% confidence level (C.L.) exclusion, where $i$ is the index of each bin, $n$ is the weighted number of observed events including signal and background, and $b$ is the weighted number of background [ref] .
Asymptotic formulae for likelihood-based tests of new physics · Sensitivity result · 0.99
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While in $τ$ channels, it will be determined by scanning and selecting the maximum figure of merit (FOM) value of $S/(a/2+√(B))$, where $S$ is the number of signal events, $B$ is the weighted number of the background $μ^+ e^- →μ^+ τ^- ν_e ν_τ$ and $a$ is the significance value, which is usually set as 3 for new physics discoveries [ref] .
Sensitivity of searches for new signals and its optimization · Sensitivity result · 0.99
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Cross section and Monte Carlo events for each signal and background are calculated and simulated by MadGraph5_aMC@NLO(MG) [ref] version 3.1.1, then showered and hadronized by Pythia8 [ref] .
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations · Event generation and simulation · 1.00
Uses data or values from 2 papers
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The main parameters from the $μ$TRISTAN $eμ$ collider proposal [ref] are listed in Tab. [ref].
$\mu$TRISTAN · Introduction · 0.89
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The main parameters from the $μ$TRISTAN $eμ$ collider proposal [ref] are listed in Tab. [ref].
Muon Ring and FCC-ee / CEPC Based Antimuon-Electron Colliders · Introduction · 0.89
Compares with 2 papers
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On the other side, comparing the results of $eμ$ collision and $e^+e^-$ or $μ^+ μ^-$ collisions [ref] based on the same luminosity, the results of $eμ$ are better than $μ^+ μ^-$ by an order of magnitude at their respective resonance points.
A Comparative Study of Z$^{\prime}$ mediated Charged Lepton Flavor Violation at future lepton colliders · Sensitivity result · 0.98
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While for the current high intensity experiments, this coupling only appears in $μ→eγ$ together with $λ_eμ ×λ_ee$ according to Ref. [ref] , as [equation] where $α$ is the fine structure constant, $G_F$ is the fermi constant, $θ_W$ is the weak mixing angle, $M_Z$, $M_Z'$, $m_μ$ and $m_e$ is the mass of $Z^0$, $Z'$, $μ$ and $e$, respectively.
Flavor Changing Effects in Theories with a Heavy Z' Boson with Family Non-Universal Couplings · Sensitivity result · 0.81
Cites as background 32 papers
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In recent years, as the construction of high energy lepton collider gradually became feasible from the engineering standpoint, interest in electron-muon collision has been reignited [ref] .
The physics case for an electron-muon collider · Introduction · 0.81
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In recent years, as the construction of high energy lepton collider gradually became feasible from the engineering standpoint, interest in electron-muon collision has been reignited [ref] .
Two-to-two processes at an electron-muon collider · Introduction · 0.81
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In recent years, as the construction of high energy lepton collider gradually became feasible from the engineering standpoint, interest in electron-muon collision has been reignited [ref] .
Lepton Flavor Violation at muon-electron colliders · Introduction · 0.81
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