25 Temmuz 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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  "doi": "10.1103/PhysRevD.110.012014", 
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    "description": "<p>A search for charged-lepton-flavor violating $\\mu \\tau qt$ ($q=u$, $c$) interactions is presented, considering both top-quark production and decay. The data analyzed correspond to $140\\text{}\\text{}{\\mathrm{fb}}^{-1}$ of proton-proton collisions at a center-of-mass energy of $\\sqrt{s}=13\\text{}\\text{}\\mathrm{TeV}$ 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 $\\tau $-lepton and at least one jet, with exactly one $b$-tagged jet, produced by a $\\mu \\tau qt$ interaction. Agreement with the Standard Model expectation within 1.6 standard deviations is observed, and limits are set at the 95% confidence level (CL) on the charged-lepton-flavor violation branching ratio of $B\\left(t\\to \\mu \\tau q\\right)&lt;8.7\u00d7{10}^{-7}$. An effective field theory interpretation is performed yielding 95% CL limits on Wilson coefficients, dependent on the flavor of the associated light quark and the Lorentz structure of the coupling. These range from $|{c}_{\\mathrm{lequ}}^{3\\left(2313\\right)}|/{\\Lambda }^{2}&lt;0.10\\text{}\\text{}{\\mathrm{TeV}}^{-2}$ for $\\mu \\tau ut$ to $|{c}_{\\mathrm{lequ}}^{1\\left(2323\\right)}|/{\\Lambda }^{2}&lt;1.8\\text{}\\text{}{\\mathrm{TeV}}^{-2}$ for $\\mu \\tau ct$. An additional interpretation is performed for scalar leptoquark production inducing charged-lepton-flavor violation, with fixed intergenerational couplings. Upper limits on leptoquark coupling strengths are set at the 95% CL, ranging from ${\\lambda }^{\\mathrm{LQ}}=1.3$ to ${\\lambda }^{\\mathrm{LQ}}=3.7$ for leptoquark masses between 0.5 and 2.0 TeV.</p>", 
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      "issue": "1", 
      "title": "Physical Review D", 
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    "title": "Search for charged-lepton-flavor violating $\\mu \\tau qt$ interactions in top-quark production and decay in $pp$ collisions at $\\sqrt{s}=13\\text{}\\text{}\\mathrm{TeV}$ with the ATLAS detector at the LHC"
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