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SUMMARY:Ultra-peripheral heavy-ion collisions with ALICE and CMS
DTSTART;VALUE=DATE-TIME:20140705T130000Z
DTEND;VALUE=DATE-TIME:20140705T132000Z
DTSTAMP;VALUE=DATE-TIME:20260410T101332Z
UID:indico-contribution-831@indico.ific.uv.es
DESCRIPTION:Speakers: Daniel Tapia Takaki (The University of Kansas)\nProt
 ons and ions accelerated by the LHC carry an electromagnetic field\, which
  acts as a source of photons. The beam energy at the LHC makes it the most
  energetic photon source ever built. The interaction of such high-energy p
 hotons with nuclei (or protons) can be studied in ultra-peripheral heavy-i
 on collisions\, where the impact parameter is larger than the sum of the n
 uclear radii and hadronic interactions are therefore strongly suppressed.\
 nBoth the ALICE and CMS collaborations have studied photonuclear productio
 n of vector mesons in ultra-peripheral Pb-Pb and p-Pb collisions. The proc
 ess effectively corresponds to an interaction between a photon\, generated
  from the electromagnetic field of one of the nuclei with the other (targe
 t) nucleus. The ALICE Collaboration has already published results on exclu
 sive photoproduction of J/$\\psi$ mesons at mid and forward rapidities in 
 Pb-Pb collisions. The cross section for this process is particularly sensi
 tive to the nuclear gluon distribution.\n\nIn this talk\, the latest resul
 ts from ALICE and CMS on exclusive production of light and heavy vector me
 sons in ultra-peripheral Pb-Pb collisions will be presented\, as well as t
 he measurement of exclusive heavy vector meson photoproduction off protons
  in ultra-peripheral p-Pb collisions at $\\sqrt{s_{\\rm NN}} = 5.02$ TeV. 
 Exclusive photoproduction of quarkonia is a powerful tool to search for pa
 rton saturation effects. Although gluon saturation is expected to occur at
  some scale to limit the growth of the Parton Distribution Function (PDF) 
 at low Bjorken-x values\, no compelling evidence for this effect has been 
 found so far. ALICE results provide direct tests of the power law dependen
 ce on the J/$\\psi$ photoproduction cross section over a wide range of $\\
 gamma {\\rm p}$ energies. CMS results on quarkonia photoproduction in p-Pb
  will also be presented. The prospects for future analyses on ultra-periph
 eral collisions at the highest LHC energy will also be discussed.\n\nhttps
 ://indico.ific.uv.es/event/2025/contributions/831/
LOCATION: Sala 2
URL:https://indico.ific.uv.es/event/2025/contributions/831/
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