2 Aralık 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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        "name": "CERN \u0130\u015fbirli\u011fi"
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    "description": "<p></p><p>A search for heavy right-handed Majorana neutrinos is performed with the ATLAS detector at the CERN Large Hadron Collider, using the $140\\text{}\\text{}{\\mathrm{fb}}^{-1}$ of proton\u2013proton collision data at $\\sqrt{s}=13\\text{}\\text{}\\mathrm{TeV}$ collected during Run 2. This search targets $t\\overline{t}$ production, in which both top quarks decay into a bottom quark and a $W$ boson, where one of the $W$ bosons decays hadronically and the other decays into an electron or muon and a heavy neutral lepton. The heavy neutral lepton is identified through a decay into an electron or muon and another $W$ boson, resulting in a pair of same-charge same-flavor leptons in the final state. This paper presents the first search for heavy neutral leptons in the mass range of 15\u201375 GeV using $t\\overline{t}$ events. No significant excess is observed over the background expectation, and upper limits are placed on the signal cross sections. Assuming a benchmark scenario of the phenomenological type-I seesaw model, these cross section limits are then translated into upper limits on the mixing parameters of the heavy Majorana neutrino with Standard Model neutrinos.</p><p></p>", 
    "doi": "10.1103/PhysRevD.110.112004", 
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      "issue": "11", 
      "title": "Physical Review D", 
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    "title": "Search for heavy right-handed Majorana neutrinos in the decay of top quarks produced in proton-proton collisions at $\\sqrt{s}=13\\text{}\\text{}\\mathrm{TeV}$ with the ATLAS detector"
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