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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>
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  <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>Coherent photoproduction of 4$\pi$ states in Run 3 with ALICE experiment</title>
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   <name first="César Omar" middle="" last="Ramírez Álvarez"></name>
   <organization>Benemérita Universidad Autónoma de Puebla</organization>
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   <name first="César Omar" middle="" last="Ramírez Álvarez"></name>
   <organization>Benemérita Universidad Autónoma de Puebla</organization>
   <emailHash>0eb6a9e829f26adc847bfba2db70db55</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>Ultraperipheral collisions at the LHC provide a unique environment to study photonuclear interactions through quasi-real photons generated by the intense electromagnetic fields of relativistic nuclei. Coherent vector-meson photoproduction is a sensitive probe of the structure of nuclei at high energies, and it allows nuclear effects to be studied in the transition region between the perturbative and non-perturbative regimes of QCD. Following the $\rho^0\to\pi^+\pi^-$ measurements, the $\pi^+\pi^-\pi^+\pi^-$ final state extends this programme towards higher invariant masses, providing access to excited $\rho$ states such as the $\rho$(1450) and $\rho$(1700). ALICE performed the first LHC measurement of coherent four-pion photoproduction in Pb–Pb UPCs at $\sqrt{s_{NN}} = 5.02$ TeV using Run 2 data. The measured cross section is $d\sigma/dy \times \mathrm{BR} = 47.8 \pm 2.3$ (stat.) $\pm 7.7$ (syst.) mb. The invariant-mass distribution is described by the contributions of the $\rho$(1450) and $\rho$(1700) together with their interference or by a single resonance plus a constant interference term. During the LHC Long Shutdown 2, ALICE introduced streaming readout and other detector upgrades that substantially enhance its data-taking capabilities in Run 3. In addition, the new light-ion OO and asymmetric pO systems allow the dependence of the production on nuclear size and photon-flux configuration to be explored. This poster presents the performance of four-pion state reconstruction in these systems, illustrating the potential of Run 3 data to extend this measurement to light-ion collisions.</abstract>
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