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SUMMARY:Untangling Soft and Hard Physics in pp Collisions
DTSTART;VALUE=DATE-TIME:20260923T180000Z
DTEND;VALUE=DATE-TIME:20260923T190000Z
DTSTAMP;VALUE=DATE-TIME:20261008T022216Z
UID:indico-event-2705@cern.ch
DESCRIPTION:The observation of QGP-like signatures in high-multiplicity pp
  collisions\, believed to be driven by soft interactions\, demands a good 
 understanding of how to disentangle hard-scattering activity from the soft
 er particle production\, which composes the so-called underlying-event (UE
 ). This talk presents two complementary measurements addressing this inter
 play. The first concerns the implementation of a novel event classifier\, 
 named flattenicity\, in dijet acoplanarity studies in pp collisions\, with
  the objective of reducing the selection bias introduced by the multiplici
 ty estimator used in previous ALICE measurements. While the multiplicity-b
 ased estimator shows a broadening of the recoil-jet azimuthal distribution
  in high-multiplicity collisions relative to minimum-bias\, results obtain
 ed with flattenicity are compatible between the two\, indicating that the 
 previously reported broadening arises from a selection bias rather than a 
 medium effect. The second measurement characterizes the UE in pp collision
 s at $\\sqrt{s}=13.6$ TeV\, the highest collision energy reached at the LH
 C to date. Understanding the UE at this energy is essential both to isolat
 e hard-scattering contributions in future analyses and to test the modelin
 g of soft QCD dynamics in current MC event generators. An overall increase
  in activity relative to lower energies is observed\, with comparisons to 
 MC event generators showing good agreement.\n\nhttps://indico.nucleares.un
 am.mx/event/2705/
LOCATION:
URL:https://indico.nucleares.unam.mx/event/2705/
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