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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">npe</journal-id><journal-title-group><journal-title xml:lang="ru">Ядерная физика и инжиниринг</journal-title><trans-title-group xml:lang="en"><trans-title>Nuclear Physics and Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2079-5629</issn><issn pub-type="epub">2079-5637</issn><publisher><publisher-name>МИФИ</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.56304/S2079562920060433</article-id><article-id custom-type="elpub" pub-id-type="custom">npe-108</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Взаимодействие плазмы, пучков частиц и излучения с веществом</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Interaction of Plasma, Particle Beams and Radiation with Matter</subject></subj-group></article-categories><title-group><article-title>Изучение распадов B0S мезона в многочастичное состояние J/ψΚ+Κ-π+ π-</article-title><trans-title-group xml:lang="en"><trans-title>Study of B0S Meson Decays to J/ψΚ+Κ-π+ π- Final State</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Овсянникова</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Ovsiannikova</surname><given-names>Т. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>123182; Москва</p></bio><bio xml:lang="en"><p>123182; Moscow</p></bio><email xlink:type="simple">tatiana.ovsiannikova@cern.ch</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Беляев</surname><given-names>И. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Belyaev</surname><given-names>I. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>123182; Москва</p></bio><bio xml:lang="en"><p>123182; Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Голубков</surname><given-names>Д. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Golubkov</surname><given-names>D. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>123182; Москва</p></bio><bio xml:lang="en"><p>123182; Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский центр “Курчатовский институт”</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Research Centre “Kurchatov Institute”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>23</day><month>04</month><year>2024</year></pub-date><volume>12</volume><issue>3</issue><fpage>170</fpage><lpage>174</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Овсянникова Т.А., Беляев И.М., Голубков Д.Ю., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Овсянникова Т.А., Беляев И.М., Голубков Д.Ю.</copyright-holder><copyright-holder xml:lang="en">Ovsiannikova Т.A., Belyaev I.M., Golubkov D.Y.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://npe.elpub.ru/jour/article/view/108">https://npe.elpub.ru/jour/article/view/108</self-uri><abstract><p>   Распады прелестных адронов в конечное состояние с чармонием являются уникальной системой для изучения свойств чармониев и подобных им состояний. Природа многих из этих состояний до сих пор не ясна, поэтому сравнение вероятностей между распадами прелестных мезонов в состоянии с новыми и известными чармониями может помочь получить дополнительную информацию о механизмах рождения подобных частиц. В статье представлены результаты исследования распадов мезона в многочастичное состояние J/ψΚ+Κ−π+π−. Результаты получены на основе анализа полного образца данных, набранных экспериментом LHCb в 2011–2018 гг. Приведены первые наблюдения нескольких распадов и измерены отношения парциальных ширин для этих распадов, а также прецизионное измерение массы B0S мезона.</p></abstract><trans-abstract xml:lang="en"><p>   The decays of B0S → J/ψΚ+Κ−π+π− are studied using a data set corresponding to an integrated luminosity of 9 fb−1 collected by the LHCb experiment in proton−proton collisions between 2011 and 2018. The decays B0S → J/ψΚ*0Κ*0 and B0S → xc l(3872)Κ+Κ− where the Κ+Κ− pair does not originate from the ϕ meson are observed for the first time. Precise measurements of the branching fraction ratios between B0S → J/ψΚ*0Κ*0,  0S → xc l(3872)ф and B0S → xc l(3872)Κ+Κ− channels are reported. A structure denoted X(4740) is observed in the J/ψϕ mass spectrum with a significance in excess of 5.3 standard deviation. In addition, the most precise measurement of the B0S meson mass in made.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>HEP</kwd><kwd>b-физика</kwd><kwd>LHCb</kwd></kwd-group><kwd-group xml:lang="en"><kwd>HEP</kwd><kwd>b-physics</kwd><kwd>LHCb</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Choi S.K. et al. // Phys. Rev. Lett. 2003. V. 91. P. 262001.</mixed-citation><mixed-citation xml:lang="en">Choi S.K. et al. // Phys. Rev. Lett. 2003. V. 91. 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