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SUMMARY:Discovering partonic rescattering in light nucleus collisions - Al
 eksas Mazeliauskas (CERN)
DTSTART:20211026T150000Z
DTEND:20211026T160000Z
UID:TALK162943@talks.cam.ac.uk
CONTACT:Heribertus Bayu Hartanto
DESCRIPTION:Ultrarelativistic collisions of heavy ions produce high densit
 y\nde-confined QCD matter known as Quark-Gluon Plasma\, which expands as a
 \nsmall droplet of nearly perfect fluid. There is mounting experimental\ne
 vidence that various signals of collectivity (indicative of soft\npartonic
  rescattering and QGP formation) are present in all hadron\ncollisions\, i
 ncluding proton-proton and proton-lead systems. The absence\nof measurable
  high momentum jet and hadron modification in proton-lead\nand peripheral 
 lead-lead collisions is however one of outstanding\nproblems in the field 
 of heavy ion physics. As the medium induced\nmodifications of these hard p
 robes is expected to be small\, one needs\nprecision tools to make the dis
 covery. In our recent Letter we\ndemonstrate that planned oxygen-oxygen (O
 O) collisions during LHC Run 3\nprovide unprecedented sensitivity to parto
 n energy loss in a system only\nseveral times larger than proton-proton co
 llisions. With leading and\nnext-to-leading order perturbative QCD calcula
 tions of nuclear\nmodification factors\, we show that the baseline in the 
 absence of\npartonic rescattering is known with up to 2% theoretical accur
 acy in\ninclusive OO collisions. We study a broad range of parton energy l
 oss\nmodels and we find that the expected signal of partonic rescattering 
 can\nbe disentangled from the baseline by measuring charged hadron spectra
  in\nthe range 20 GeV< pT < 100 GeV.\n\nRef.: Huss\, Kurkela\, Mazelia
 uskas\, Paatelainen\, van der Schee\,\nWiedemann\, Phys.Rev.Lett. 126 (202
 1) 19\, 192301 [2007.13754]
LOCATION:https://cern.zoom.us/j/61144924828?pwd=WDB6QmFCMEZiSEN5Q0k2aklWSj
 k5Zz09
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