1 Ocak 2019 Dergi makalesi Açık Erişim

CERN İşbirliği

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/105997</identifier>
  <creators>
    <creator>
      <creatorName>CERN İşbirliği</creatorName>
      <affiliation>CERN</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Measurement Of The Phase Between Strong And Electromagnetic Amplitudes Of / Decays</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2019</publicationYear>
  <dates>
    <date dateType="Issued">2019-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/105997</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1016/j.physletb.2019.03.001</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 16 energy points of ${e}^{+}{e}^{-}$ annihilation data collected in the vicinity of the $J/\psi $ resonance with the BESIII detector and with a total integrated luminosity of around $100\phantom{\rule{0.25em}{0ex}}{\text{pb}}^{-1}$, we study the relative phase between the strong and electromagnetic amplitudes of $J/\psi $ decays. The relative phase between $J/\psi $ electromagnetic decay and the continuum process (${e}^{+}{e}^{-}$ annihilation without the $J/\psi $ resonance) is confirmed to be zero by studying the cross section lineshape of ${\mu }^{+}{\mu }^{-}$ production. The relative phase between $J/\psi $ strong and electromagnetic decays is then measured to be ${\left(84.9±3.6\right)}^{\circ }$ or ${\left(-84.7±3.1\right)}^{\circ }$ for the $2\left({\pi }^{+}{\pi }^{-}\right){\pi }^{0}$ final state by investigating the interference pattern between the $J/\psi $ decay and the continuum process. This is the first measurement of the relative phase between $J/\psi $ strong and electromagnetic decays into a multihadron final state using the lineshape of the production cross section. We also study the production lineshape of the multihadron final state $\eta {\pi }^{+}{\pi }^{-}$ with $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^{0}$, which provides additional information about the phase between the $J/\psi $ electromagnetic decay amplitude and the continuum process. Additionally, the branching fraction of $J/\psi \to 2\left({\pi }^{+}{\pi }^{-}\right){\pi }^{0}$ is measured to be $\left(4.73±0.44\right)\text{%}$ or $\left(4.85±0.45\right)\text{%}$, and the branching fraction of $J/\psi \to \eta {\pi }^{+}{\pi }^{-}$ is measured to be $\left(3.78±0.68\right)×{10}^{-4}$. Both of them are consistent with the world average values. The quoted uncertainties include both statistical and systematic uncertainties, which are mainly caused by the low statistics.&lt;/p&gt;</description>
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