Searching for charged lepton flavor violation at ep colliders

Antusch, Stefan; Hammad, A.; Rashed, Ahmed

doi:10.1007/jhep03(2021)230

Cited by 7 publications

(4 citation statements)

References 39 publications

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“…Recent studies demonstrate that the LHeC could be a world-leading laboratory to study flavor-changing neutral currents in the charged lepton sector, in particular for processes that lead to electron-to-tau transitions, where the projected sensitivity could be an order of magnitude better than current and planned experiments in tau factories [44].…”

Section: Beyond the Standard Model Searchesmentioning

confidence: 99%

An experiment for electron-hadron scattering at the LHC

et al. 2022

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Novel considerations are presented on the physics, apparatus and accelerator designs for a future, luminous, energy frontier electron-hadron (eh) scattering experiment at the LHC in the thirties for which key physics topics and their relation to the hadron-hadron HL-LHC physics programme are discussed. Demands are derived set by these physics topics on the design of the LHeC detector, a corresponding update of which is described. Optimisations on the accelerator design, especially the interaction region (IR), are presented. Initial accelerator considerations indicate that a common IR is possible to be built which alternately could serve eh and hh collisions while other experiments would stay on hh in either condition. A forward-backward symmetrised option of the LHeC detector is sketched which would permit extending the LHeC physics programme to also include aspects of hadron-hadron physics. The vision of a joint eh and hh physics experiment is shown to open new prospects for solving fundamental problems of high energy heavy-ion physics including the partonic structure of nuclei and the emergence of hydrodynamics in quantum field theory while the genuine TeV scale DIS physics is of unprecedented rank.

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Section: Beyond the Standard Model Searchesmentioning

confidence: 99%

An experiment for electron-hadron scattering at the LHC

et al. 2022

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“…Ref. [35] discusses e → τ (µ) at a future LHeC, using a small subset of BSM operators, namely vector and scalar vertex corrections. Ref.…”

Section: Jhep03(2021)256mentioning

confidence: 99%

Charged lepton flavor violation at the EIC

Cirigliano

Fuyuto

Lee

et al. 2021

J. High Energ. Phys.

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We present a comprehensive analysis of the potential sensitivity of the Electron-Ion Collider (EIC) to charged lepton flavor violation (CLFV) in the channel ep→τX, within the model-independent framework of the Standard Model Effective Field Theory (SMEFT). We compute the relevant cross sections to leading order in QCD and electroweak corrections and perform simulations of signal and SM background events in various τ decay channels, suggesting simple cuts to enhance the associated estimated efficiencies. To assess the discovery potential of the EIC in τ-e transitions, we study the sensitivity of other probes of this physics across a broad range of energy scales, from pp→eτX at the Large Hadron Collider to decays of B mesons and τ leptons, such as τ→eγ, τ→eℓ+ℓ−, and crucially the hadronic modes τ→eY with Y∈π, K, ππ, Kπ, …. We find that electroweak dipole and four-fermion semi-leptonic operators involving light quarks are already strongly constrained by τ decays, while operators involving the c and b quarks present more promising discovery potential for the EIC. An analysis of three models of leptoquarks confirms the expectations based on the SMEFT results. We also identify future directions needed to maximize the reach of the EIC in CLFV searches: these include an optimization of the τ tagger in hadronic channels, an exploration of background suppression through tagging b and c jets in the final state, and a global fit by turning on all SMEFT couplings, which will likely reveal new discovery windows for the EIC.

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“…Ref. [30] discusses e → τ (µ) at a future LHeC, using a small subset of BSM operators, namely vector and scalar vertex corrections. Ref.…”

Section: Introductionmentioning

confidence: 99%

Charged Lepton Flavor Violation at the EIC

Cirigliano,

Fuyuto,

Lee

et al. 2021

Preprint

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We present a comprehensive analysis of the potential sensitivity of the Electron-Ion Collider (EIC) to charged lepton flavor violation (CLFV) in the channel ep → τ X, within the model-independent framework of the Standard Model Effective Field Theory (SMEFT). We compute the relevant cross sections to leading order in QCD and electroweak corrections and perform simulations of signal and SM background events in various τ decay channels, suggesting simple cuts to enhance the associated estimated efficiencies. To assess the discovery potential of the EIC in τ -e transitions, we study the sensitivity of other probes of this physics across a broad range of energy scales, from pp → eτ X at the Large Hadron Collider to decays of B mesons and τ leptons, such as τ → eγ, τ → e + − , and crucially the hadronic modes τ → eY with Y ∈ {π, K, ππ, Kπ, ...}. We find that electroweak dipole and four-fermion semi-leptonic operators involving light quarks are already strongly constrained by τ decays, while operators involving the c and b quarks present more promising discovery potential for the EIC. An analysis of three models of leptoquarks confirms the expectations based on the SMEFT results. We also identify future directions needed to maximize the reach of the EIC in CLFV searches: these include an optimization of the τ tagger in hadronic channels, an exploration of background suppression through tagging b and c jets in the final state, and a global fit by turning on all SMEFT couplings, which will likely reveal new discovery windows for the EIC.

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Searching for charged lepton flavor violation at ep colliders

Cited by 7 publications

References 39 publications

An experiment for electron-hadron scattering at the LHC

An experiment for electron-hadron scattering at the LHC

Charged lepton flavor violation at the EIC

Charged Lepton Flavor Violation at the EIC

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