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<category>DPyC SMF</category>
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  <title>Dr.</title>
  <name first="Pablo" middle="" last="Roig"></name>
  <organization>Cinvestav</organization>
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<title>XXI Mexican School on Particles and Fields 2026</title>
<description>&lt;p style="text-align:justify"&gt;The &lt;strong&gt;XXI Mexican School on Particles and Fields&lt;/strong&gt; takes place from &lt;strong&gt;October 19th to 23rd, 2026&lt;/strong&gt;, in the city of Puebla, Puebla, M&amp;eacute;xico. The format of the school is&amp;nbsp;such that the morning sessions are devoted to theoretical and experimental reviews, whereas parallel thematic sessions shall be held in the afternoons. All the reviews and seminars are delivered by experts of international prestige on subjects which are of current interest to the global scientific community and are also actively pursued within M&amp;eacute;xico. ​&lt;/p&gt;

&lt;p style="text-align:justify"&gt;In order to equip graduate students and attending postdocs with the necessary tools to perform fully in the school, courses of interest are taught, with English being the language of instruction. An informal and friendly atmosphere is encouraged during the courses so that the students can overcome their inhibitions and actively participate in the discussions. ​&lt;/p&gt;

&lt;p style="text-align:justify"&gt;&lt;em&gt;&lt;u&gt;&lt;strong&gt;Organizing Committee&lt;/strong&gt;&lt;/u&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p style="text-align:justify"&gt;Dr. Isabel Pedraza Morales (President DPyC-SMF) [BUAP]&lt;br /&gt;
Dr. Humberto G. Maury Cuna (Vice-President DPyC-SMF)&amp;nbsp;[UGTO]&lt;/p&gt;

&lt;p style="text-align:justify"&gt;&lt;em&gt;&lt;u&gt;&lt;strong&gt;Local Organizing Committee&lt;/strong&gt;&lt;/u&gt;&lt;/em&gt;&lt;/p&gt;

&lt;p style="text-align:justify"&gt;Dr. Haydee Hern&amp;aacute;ndez [BUAP]&lt;br /&gt;
Dr. Arturo Fern&amp;aacute;ndez [BUAP]&lt;br /&gt;
Dr. Humberto Salazar [BUAP]&lt;br /&gt;
Dr. Olga F&amp;eacute;lix Beltr&amp;aacute;n [BUAP]&lt;/p&gt;
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 <name>Puebla</name>
 <address>1. Edificio Carolino, Calle 4 Sur 104, Centro, Puebla, Puebla.
2. Ciudad Universitaria 2, Calle Heberto Rodríguez N°119, Colonia San Antonio Toluquilla, C.P. 72960, San Pedro Zacachimalpa, Puebla</address>
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<startDate>2026-10-19T07:30:00</startDate>
<endDate>2026-10-23T19:30:00</endDate>
<creationDate>2026-07-01T10:52:23</creationDate>
<modificationDate>2026-10-30T16:10:28</modificationDate>
<timezone>Mexico/General</timezone>
<chair>
 <user>
  <title>Prof.</title>
  <name first="Isabel" middle="" last="Pedraza"></name>
  <organization>Benemérita Universidad Autónoma de Puebla</organization>
  <emailHash>65efd11437264d48aa1f7486255a57bc</emailHash>
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  <title>Dr.</title>
  <name first="Humberto" middle="" last="Maury Cuna"></name>
  <organization>Universidad de Guanajuato</organization>
  <emailHash>0bba80e6b6d806cda49089f089616ab2</emailHash>
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  <title>Dr.</title>
  <name first="Haydee" middle="" last="Hernandez-Arellano"></name>
  <organization>BUAP</organization>
  <emailHash>5848375cb8b0db28e94350f19dcb744f</emailHash>
 </user>
 <user>
  <title>Dr.</title>
  <name first="Beltran" middle="" last="Felix"></name>
  <organization>Benemerita Universidad Autonoma de Puebla</organization>
  <emailHash>398909c50ebb53abfbd6c5540e4e5066</emailHash>
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 <title>Event selection and Z→μμ cross section as a function of charged-particle multiplicity in pp collisions at √s = 5.36 TeV with CMS</title>
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   <title>Mr.</title>
   <name first="Fernando Enrique" middle="" last="Neri Huerta"></name>
   <organization>FCFM-BUAP</organization>
   <emailHash>7856ac604a3b59ea6309ce72b2116c36</emailHash>
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   <title>Mr.</title>
   <name first="Fernando Enrique" middle="" last="Neri Huerta"></name>
   <organization>FCFM-BUAP</organization>
   <emailHash>7856ac604a3b59ea6309ce72b2116c36</emailHash>
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  <name>Edificio Carolino</name>
  <address>Edificio Carolino, Calle 4 Sur 104, Centro, Puebla, Puebla.</address>
  <room>Salón de Proyecciones</room>
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 <startDate>2026-10-22T17:00:00</startDate>
 <endDate>2026-10-22T19:00:00</endDate>
 <duration>02:00</duration>
 <abstract>Measurements of hard-process production as a function of charged-particle multiplicity in small systems require a careful control of pileup, since additional 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-associated multiplicity used in the analysis. Using the 2024 pp reference dataset, we measure the Z→μμ cross section differentially in Z transverse momentum and in classes of charged-particle multiplicity, with efficiency corrections and unfolding to the generator level. The results are compared with NNLO+NNLL predictions from DYTurbo for several PDF sets, with scale, PDF and resummation uncertainties. The calculation chain was first validated against the published CMS predictions at 5.02 TeV. This measurement provides a precise electroweak reference for the study of heavy-flavour production versus multiplicity.</abstract>
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