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SUMMARY:Evidence of different prompt $\\Lambda_c^+$ baryon and D meson ell
 iptic flow in Pb-Pb collisions at $\\sqrt{s_{NN}}$ = 5.36 TeV with ALICE a
 t the LHC
DTSTART:20260512T090000Z
DTEND:20260512T100000Z
DTSTAMP:20260526T080900Z
UID:indico-event-1683787@indico.cern.ch
CONTACT:ep-seminars.colloquia@cern.ch
DESCRIPTION:Speakers: Stefano Politano (CERN)\n\n \nAccording to QCD calc
 ulations on the lattice\, at the high energy densities and temperatures re
 ached in ultrarelativistic heavy-ion collisions\, nuclear matter undergoes
  a phase transition to a colour-deconfined state\, the quark-gluon plasma 
 (QGP). Heavy quarks\, charm and beauty\, are produced early in the collisi
 on due to their large masses and thus experience the full evolution of the
  system\, serving as excellent probes of QGP properties. As they traverse 
 the expanding medium\, heavy quarks interact with its constituents\, losin
 g energy and undergoing partial thermalisation. In a QGP\, heavy quarks ca
 n hadronize via both fragmentation and recombination with lighter quarks f
 rom the medium. These mechanisms affect the properties of the observed fin
 al-state hadrons. In particular\,  the azimuthal anisotropy\, primarily q
 uantified by the elliptic-flow coefficient (v2)\, of heavy-flavour hadrons
  in non-central collisions is particularly sensitive to the QGP transport 
 coefficients\, the heavy-quark degree of thermalisation in the medium\, an
 d the underlying hadronisation mechanism. The comparison of the $v_2$ of c
 harm mesons and baryons gives direct insight into hadronisation mechanisms
  and the partonic origin of collective flow. Charm-baryon $v_2$ measuremen
 ts remained absent from the experimental landscape until recently\, limiti
 ng our understanding of heavy-quark hadronisation and QGP transport proper
 ties.\nThis seminar presents new measurements of charm-hadron $v_2$ in Pb$
 -$Pb collisions at $\\sqrt{s_{\\mathrm{NN}}} = 5.36$ TeV by the ALICE Coll
 aboration. We report precision measurements of prompt non-strange and stra
 nge D-meson $v_2$\, alongside the first experimental determination of the 
 $\\Lambda_c^+$ baryon $v_2$\, spanning a wide range of transverse momentum
 . The results reveal differences between charm baryon and meson $v_2$ at m
 edium-to-high transverse momentum\, providing strong support to the parton
 ic origin of collective flow in the heavy-flavour sector. The baryon-meson
  separation at high transverse momentum is consistent with a scenario wher
 e charm quarks combine with light quarks from the medium to form final-sta
 te hadrons. The measurements are compared with state-of-the-art transport-
 model predictions\, providing new constraints on QGP transport properties.
 \n \nCoffee will be served at 10h30\n \n\nhttps://indico.cern.ch/event/1
 683787/\n\nZoom: https://cern.zoom.us/j/62406780909?pwd=nX5FvhUyZWD9LpRqMV
 0fggqI3zUzoT.1
LOCATION:500/1-001 - Main Auditorium (CERN)
URL:https://indico.cern.ch/event/1683787/
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