Search for charged-lepton-flavour violating $μτqt$ interactions in top-quark production and decay in $pp$ collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector at the LHC
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866929477011898368 |
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| author | ATLAS Collaboration |
| author_facet | ATLAS Collaboration |
| contents | A search for charged-lepton-flavour violating $μτqt$ ($q=u,c$) interactions is presented, considering both top-quark production and decay. The data analysed correspond to 140 $\textrm{fb}^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}= $13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The analysis targets events containing two muons with the same electric charge, a hadronically decaying $τ$-lepton and at least one jet, with exactly one $b$-tagged jet, produced by a $μτqt$ interaction. Agreement with the Standard Model expectation within $1.6σ$ is observed, and limits are set at the 95% CL on the charged-lepton-flavour violation branching ratio of $\mathcal{B}(t \to μτq) < 8.7 \times 10^{-7}$. An Effective Field Theory interpretation is performed yielding 95% CL limits on Wilson coefficients, dependent on the flavour of the associated light quark and the Lorentz structure of the coupling. These range from $|c_{\mathsf{lequ}}^{3(2313)}| / Λ^{2} < 0.10\textrm{ TeV}^{-2}$ for $μτut$ to $|c_{\mathsf{ lequ}}^{1(2323)}| / Λ^{2} < 1.8\textrm{ TeV}^{-2}$ for $μτct$. An additional interpretation is performed for scalar leptoquark production inducing charged lepton flavour violation, with fixed inter-generational couplings. Upper limits on leptoquark coupling strengths are set at the 95% CL, ranging from $λ^{\textrm{LQ}} = $1.3 to $λ^{\textrm{LQ}} = $3.7 for leptoquark masses between 0.5 and 2.0 TeV. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_06742 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Search for charged-lepton-flavour violating $μτqt$ interactions in top-quark production and decay in $pp$ collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector at the LHC ATLAS Collaboration High Energy Physics - Experiment A search for charged-lepton-flavour violating $μτqt$ ($q=u,c$) interactions is presented, considering both top-quark production and decay. The data analysed correspond to 140 $\textrm{fb}^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}= $13 TeV recorded with the ATLAS detector at the Large Hadron Collider. The analysis targets events containing two muons with the same electric charge, a hadronically decaying $τ$-lepton and at least one jet, with exactly one $b$-tagged jet, produced by a $μτqt$ interaction. Agreement with the Standard Model expectation within $1.6σ$ is observed, and limits are set at the 95% CL on the charged-lepton-flavour violation branching ratio of $\mathcal{B}(t \to μτq) < 8.7 \times 10^{-7}$. An Effective Field Theory interpretation is performed yielding 95% CL limits on Wilson coefficients, dependent on the flavour of the associated light quark and the Lorentz structure of the coupling. These range from $|c_{\mathsf{lequ}}^{3(2313)}| / Λ^{2} < 0.10\textrm{ TeV}^{-2}$ for $μτut$ to $|c_{\mathsf{ lequ}}^{1(2323)}| / Λ^{2} < 1.8\textrm{ TeV}^{-2}$ for $μτct$. An additional interpretation is performed for scalar leptoquark production inducing charged lepton flavour violation, with fixed inter-generational couplings. Upper limits on leptoquark coupling strengths are set at the 95% CL, ranging from $λ^{\textrm{LQ}} = $1.3 to $λ^{\textrm{LQ}} = $3.7 for leptoquark masses between 0.5 and 2.0 TeV. |
| title | Search for charged-lepton-flavour violating $μτqt$ interactions in top-quark production and decay in $pp$ collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector at the LHC |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2403.06742 |