English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This letter presents the first measurement of the angle between different jetaxes (denoted as ${\Delta}R$) in Pb$-$Pb collisions. The measurement is carriedout in the 0$-$10% most-central events at $\sqrt{s_{\rm NN}} = 5.02$ TeV. Jetsare assembled by clustering charged particles at midrapidity using theanti-$k_{\rm T}$ algorithm with resolution parameters $R=0.2$ and $0.4$ andtransverse momenta in the intervals $40 < p_{\rm T}^{\rm ch jet} < 140$ GeV/$c$and $80 < p_{\rm T}^{\rm ch jet} < 140$ GeV/$c$, respectively. Measurements atthese low transverse momenta enhance the sensitivity to quark$-$gluon plasma(QGP) effects. A comparison to models implementing various mechanisms of jetenergy loss in the QGP shows that the observed narrowing of the Pb$-$Pbdistribution relative to pp can be explained if quark-initiated jets are morelikely to emerge from the medium than gluon-initiated jets. These newmeasurements discard intra-jet $p_{\rm T}$ broadening as described in a modelcalculation with the BDMPS formalism as the main mechanism of energy loss inthe QGP. The data are sensitive to the angular scale at which the QGP canresolve two independent splittings, favoring mechanisms that incorporateincoherent energy loss.

Measurement of the angle between jet axes in Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV