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SUMMARY:Event selection and Z→μμ cross section as a function of charge
 d-particle multiplicity in pp collisions at √s = 5.36 TeV with CMS
DTSTART;VALUE=DATE-TIME:20261022T220000Z
DTEND;VALUE=DATE-TIME:20261023T000000Z
DTSTAMP;VALUE=DATE-TIME:20261103T204400Z
UID:indico-contribution-85@cern.ch
DESCRIPTION:Speakers: Mr. NERI HUERTA\, Fernando Enrique (FCFM-BUAP)\nMeas
 urements of hard-process production as a function of charged-particle mult
 iplicity in small systems require a careful control of pileup\, since addi
 tional interactions modify the multiplicity observable and bias the event 
 classes. We present a pileup-rejection filter ported to Run 3 MiniAOD and 
 tuned for the 5.36 TeV pp reference data\, together with its validation on
  zero-bias data and simulation\, including a closure test on the vertex-as
 sociated multiplicity used in the analysis. Using the 2024 pp reference da
 taset\, we measure the Z→μμ cross section differentially in Z transver
 se momentum and in classes of charged-particle multiplicity\, with efficie
 ncy corrections and unfolding to the generator level. The results are comp
 ared with NNLO+NNLL predictions from DYTurbo for several PDF sets\, with s
 cale\, PDF and resummation uncertainties. The calculation chain was first 
 validated against the published CMS predictions at 5.02 TeV. This measurem
 ent provides a precise electroweak reference for the study of heavy-flavou
 r production versus multiplicity.\n\nhttps://indico.nucleares.unam.mx/even
 t/2675/session/1/contribution/85
LOCATION:Edificio Carolino Salón de Proyecciones
URL:https://indico.nucleares.unam.mx/event/2675/session/1/contribution/85
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