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Creators/Authors contains: "Cruz-Torres, R."

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  1. Free, publicly-accessible full text available April 1, 2027
  2. This paper presents the first measurement of the angle between different jet axes (denoted as ΔRaxis ) in Pb-Pb collisions. The measurement is carried out in the 0–10 % most-central events at sNN =5.02 TeV. Jets are assembled by clustering charged particles at midrapidity using the anti-kT algorithm with resolution parameters R=0.2 and 0.4 and transverse momenta in the intervals 40< pT chjet <140GeV/c and 80< pT chjet <140GeV/c , respectively. Measurements at these low transverse momenta enhance the sensitivity to quark-gluon plasma (QGP) effects. A comparison to models implementing various mechanisms of jet energy loss in the QGP suggests that the observed narrowing of the Pb-Pb distribution relative to pp can be explained if quark-initiated jets are more likely to emerge from the medium than gluon-initiated jets. These new measurements disfavor intrajet pT broadening as implemented in a simple model calculation with the Baier-Dokshitzer-Mueller-Peigne-Schiff formalism for energy loss in the QGP. The comparison of Pb-Pb and pp collisions shows sensitivity to the angular scale at which the QGP can resolve two independent splittings, favoring mechanisms that incorporate incoherent energy loss. 
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    Free, publicly-accessible full text available April 1, 2027
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