18 Mart 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

DataCite XML

<?xml version='1.0' encoding='utf-8'?>
<resource xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://datacite.org/schema/kernel-4" xsi:schemaLocation="http://datacite.org/schema/kernel-4 http://schema.datacite.org/meta/kernel-4.1/metadata.xsd">
  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/275199</identifier>
  <creators>
    <creator>
      <creatorName>CERN İşbirliği</creatorName>
      <affiliation>CERN</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Observation Of $J/\Psi $ Decays To ${E}^{+}{E}^{-}{E}^{+}{E}^{-}$ And ${E}^{+}{E}^{-}{\Mu }^{+}{\Mu }^{-}$</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2024</publicationYear>
  <dates>
    <date dateType="Issued">2024-03-18</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/275199</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1103/PhysRevD.109.052006</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;Using a data sample of $4.481×{10}^{8}\text{}\text{}\psi \left(3686\right)$ events collected with the BESIII detector, we report the first observation of the four-lepton-decays $J/\psi \to {e}^{+}{e}^{-}{e}^{+}{e}^{-}$ and $J/\psi \to {e}^{+}{e}^{-}{\mu }^{+}{\mu }^{-}$ utilizing the process $\psi \left(3686\right)\to {\pi }^{+}{\pi }^{-}J/\psi $. The branching fractions are determined to be $\left[5.48±0.31\left(\mathrm{stat}\right)±0.45\left(\mathrm{syst}\right)\right]×{10}^{-5}$ and $\left[3.53±0.22\left(\mathrm{stat}\right)±0.13\left(\mathrm{syst}\right)\right]×{10}^{-5}$, respectively. The results are consistent with theoretical predictions. No significant signal is observed for $J/\psi \to {\mu }^{+}{\mu }^{-}{\mu }^{+}{\mu }^{-}$, and an upper limit on the branching fraction is set at $1.6×{10}^{-6}$ at the 90% confidence level. A $CP$ asymmetry observable is constructed for the first two channels, which is measured to be $\left(-0.012±0.054±0.010\right)$ and $\left(0.062±0.059±0.006\right)$, respectively. No evidence for $CP$ violation is observed in this process.&lt;/p&gt;</description>
  </descriptions>
</resource>