<record>
  <controlfield tag="001">1629</controlfield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">heavy neutrino</subfield>
  </datafield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">heavy neutral lepton</subfield>
  </datafield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Belle</subfield>
  </datafield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">Belle II </subfield>
  </datafield>
</record>