<?xml version="1.0" encoding="UTF-8"?> <collection xmlns="http://www.loc.gov/MARC21/slim"> <record> <controlfield tag="001">2898130</controlfield> <controlfield tag="003">SzGeCERN</controlfield> <controlfield tag="005">20240522202727.0</controlfield> <datafield tag="024" ind1="8" ind2=" "> <subfield code="a">oai:cds.cern.ch:2898130</subfield> <subfield code="p">cerncds:FULLTEXT</subfield> <subfield code="p">cerncds:cms-notes</subfield> </datafield> <datafield tag="037" ind1=" " ind2=" "> <subfield code="a">CMS-NOTE-2024-003</subfield> </datafield> <datafield tag="041" ind1=" " ind2=" "> <subfield code="a">eng</subfield> </datafield> <datafield tag="088" ind1=" " ind2=" "> <subfield code="a">CERN-CMS-NOTE-2024-003</subfield> </datafield> <datafield tag="100" ind1=" " ind2=" "> <subfield code="a">The CMS Collaboration</subfield> </datafield> <datafield tag="245" ind1=" " ind2=" "> <subfield code="a">Simulation studies for a search for dark photons decaying to lepton jets</subfield> </datafield> <datafield tag="260" ind1=" " ind2=" "> <subfield code="c">2024</subfield> </datafield> <datafield tag="269" ind1=" " ind2=" "> <subfield code="a">Geneva</subfield> <subfield code="b">CERN</subfield> <subfield code="c">11 May 2024</subfield> </datafield> <datafield tag="300" ind1=" " ind2=" "> <subfield code="a">6 p</subfield> </datafield> <datafield tag="520" ind1=" " ind2=" "> <subfield code="a">A Run 2 full simulation sample for dark photon production with decay to a lepton jet is used to study the shape of the reconstructed dark photon mass distribution over the range 0.1 GeV to 4.0 GeV for generated mass. The normalized mass distributions of dimuon pairs from simulated standard model Drell-Yan events are compared between opposite sign and like sign muon pairs. A multivariate event selection using the boosted decision tree method is developed to substantially suppress Drell-Yan background events while retaining good signal efficiency.</subfield> </datafield> <datafield tag="595" ind1=" " ind2=" "> <subfield code="a">CERN EDS</subfield> </datafield> <datafield tag="650" ind1="1" ind2="7"> <subfield code="2">SzGeCERN</subfield> <subfield code="a">Detectors and Experimental Techniques</subfield> </datafield> <datafield tag="653" ind1="1" ind2=" "> <subfield code="9">CMS</subfield> <subfield code="a">Physics</subfield> </datafield> <datafield tag="690" ind1="C" ind2=" "> <subfield code="a">INTNOTE</subfield> </datafield> <datafield tag="690" ind1="C" ind2=" "> <subfield code="a">CERN</subfield> </datafield> <datafield tag="690" ind1="C" ind2=" "> <subfield code="a">PUBLCMS</subfield> </datafield> <datafield tag="693" ind1=" " ind2=" "> <subfield code="a">CERN LHC</subfield> <subfield code="e">CMS</subfield> </datafield> <datafield tag="710" ind1=" " ind2=" "> <subfield code="5">PH</subfield> </datafield> <datafield tag="710" ind1=" " ind2=" "> <subfield code="g">CMS Collaboration</subfield> </datafield> <datafield tag="856" ind1="4" ind2=" "> <subfield code="8">2531051</subfield> <subfield code="s">231373</subfield> <subfield code="u">http://cds.cern.ch/record/2898130/files/NOTE2024_003.pdf</subfield> </datafield> <datafield tag="916" ind1=" " ind2=" "> <subfield code="s">n</subfield> <subfield code="w">202421</subfield> </datafield> <datafield tag="963" ind1=" " ind2=" "> <subfield code="a">PUBLIC</subfield> </datafield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">INTNOTECMSPUBL</subfield> </datafield> <datafield tag="980" ind1=" " ind2=" "> <subfield code="a">NOTE</subfield> </datafield> </record> </collection>