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SUMMARY:Nonextensivity and KNO scaling of charged particle production
DTSTART;VALUE=DATE-TIME:20261023T213000Z
DTEND;VALUE=DATE-TIME:20261023T214000Z
DTSTAMP;VALUE=DATE-TIME:20261110T135506Z
UID:indico-contribution-83@cern.ch
DESCRIPTION:Speakers: Dr. ALVARADO GARCÍA\, J. Ricardo (Benemérita Unive
 rsidad Autónoma de Puebla)\nWe study the charged particle production in u
 ltrarelativistic collisions within the color string fragmentation picture.
  In this picture\, we describe the $p_T$ spectrum as the convolution of th
 e Schwinger mechanism with string tension fluctuations. Importantly\, repr
 oducing the power-law tail of the experimental $p_T$ spectrum requires hea
 vy-tailed distributions. For instance\, the recently introduced $q$-Gaussi
 an string-tension fluctuations yield a Tricomi function that captures the 
 low and high $p_T$ regimes. In this work\, we study the power-law tail in 
 the $p_T$ spectrum\, present in several models\, including the Hagedorn fu
 nction\, the two-component model\, and the description for the softened ha
 dron production. Interestingly\, these models can be studied in the high-$
 p_T$ regime as Pareto-type string tension fluctuations\, which are compati
 ble with the KNO scale invariance required for describing hard processes. 
 Additionally\, the heavy-tailed string tension fluctuations are accompanie
 d by temperature fluctuations\, indicating that the medium where the parti
 cles are produced is out of equilibrium. We apply this framework to ALICE 
 data and extract the effective temperature and the power-law trend of the 
 high-$p_T$ particle production. The latter shows clear trends with event m
 ultiplicity and collision centrality\, consistent with enhanced hard-parti
 cle production in small systems and with high-$p_T$ particle suppression i
 n heavy ion collisions.\n\nhttps://indico.nucleares.unam.mx/event/2675/ses
 sion/3/contribution/83
LOCATION:Puebla
URL:https://indico.nucleares.unam.mx/event/2675/session/3/contribution/83
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