Search for Lepton Flavor Violating Signals at the Future Electron-Proton Colliders
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866917120198049792 |
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| author | Barik, Anjan Kumar Dey, Atri Samui, Tousik |
| author_facet | Barik, Anjan Kumar Dey, Atri Samui, Tousik |
| contents | The search for lepton flavor violation (LFV) is a powerful probe to look for new physics beyond the Standard Model. We explored the possibility of searches for LFV $Z$ boson couplings to electron and muon pairs at the upcoming electron-proton colliders, namely the Large Hadron Electron Collider (LHeC) and the Future Circular lepton-hadron Collider (FCC-eh). We employed the study via a single muon plus an associated jet channel to search for the LFV signal. We used a multivariate technique to obtain an improved signal-background analysis. By using the condition on nonobservation of any significant deviation of the signal over the expected background, we provide an upper limit on the LFV $Z$ boson coupling and corresponding branching ratio (BR). We find that an upper limit of up to $1.13\times 10^{-7}$ and $4.64 \times 10^{-8}$ can be set on BR($Z\to e μ$) at 95\% confidence level (C.L.) with one year run of LHeC and FCC-eh, respectively, if the LFV coupling is governed by vector or axial-vector coupling. For tensor or axial-tensor coupling, these limits can be improved up to $2.34\times 10^{-8}$ and $5.02\times 10^{-9}$ for LHeC and FCC-eh machines, respectively, at 95\% C.L. The projected numbers improve significantly over the existing limit of $2.62\times 10^{-7}$ set by ATLAS. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_10540 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Search for Lepton Flavor Violating Signals at the Future Electron-Proton Colliders Barik, Anjan Kumar Dey, Atri Samui, Tousik High Energy Physics - Phenomenology High Energy Physics - Experiment The search for lepton flavor violation (LFV) is a powerful probe to look for new physics beyond the Standard Model. We explored the possibility of searches for LFV $Z$ boson couplings to electron and muon pairs at the upcoming electron-proton colliders, namely the Large Hadron Electron Collider (LHeC) and the Future Circular lepton-hadron Collider (FCC-eh). We employed the study via a single muon plus an associated jet channel to search for the LFV signal. We used a multivariate technique to obtain an improved signal-background analysis. By using the condition on nonobservation of any significant deviation of the signal over the expected background, we provide an upper limit on the LFV $Z$ boson coupling and corresponding branching ratio (BR). We find that an upper limit of up to $1.13\times 10^{-7}$ and $4.64 \times 10^{-8}$ can be set on BR($Z\to e μ$) at 95\% confidence level (C.L.) with one year run of LHeC and FCC-eh, respectively, if the LFV coupling is governed by vector or axial-vector coupling. For tensor or axial-tensor coupling, these limits can be improved up to $2.34\times 10^{-8}$ and $5.02\times 10^{-9}$ for LHeC and FCC-eh machines, respectively, at 95\% C.L. The projected numbers improve significantly over the existing limit of $2.62\times 10^{-7}$ set by ATLAS. |
| title | Search for Lepton Flavor Violating Signals at the Future Electron-Proton Colliders |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2306.10540 |