15 Ağustos 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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        "name": "CERN \u0130\u015fbirli\u011fi"
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    "description": "<p>Based on $\\left(2712.4\u00b114.3\\right)\u00d7{10}^{6}$ ${e}^{+}{e}^{-}\\to \\psi \\left(3686\\right)$ events collected with the BESIII detector operating at the BEPCII Collider, we report the first evidence of ${\\chi }_{c0}\\to \\Lambda \\overline{\\Lambda }\\varphi $ decays and the first observation of ${\\chi }_{c1,2}\\to \\Lambda \\overline{\\Lambda }\\varphi $ decays, with significances of $4.1\\sigma $, $11.3\\sigma $ and $13.0\\sigma $, respectively. The decay branching fractions of ${\\chi }_{c0,1,2}\\to \\Lambda \\overline{\\Lambda }\\varphi $ are measured to be $\\left(2.99\u00b11.24\u00b10.19\\right)\u00d7{10}^{-5}$, $\\left(6.01\u00b10.90\u00b10.40\\right)\u00d7{10}^{-5}$, and $\\left(7.13\u00b10.81\u00b10.36\\right)\u00d7{10}^{-5}$, where the first uncertainties are statistical and the second systematic. No obvious enhancement near the $\\Lambda \\overline{\\Lambda }$ production threshold or excited $\\Lambda $ state is found in the $\\Lambda \\varphi $ (or $\\overline{\\Lambda }\\varphi $) system.</p>", 
    "doi": "10.1103/PhysRevD.110.032016", 
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      "issue": "3", 
      "title": "Physical Review D", 
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    "publication_date": "2024-08-15", 
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    "title": "Study of the decays ${\\chi }_{cJ}\\to \\Lambda \\overline{\\Lambda }\\varphi $"
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