كيف يثني السحاب الحار النفاث سريع

الملخص الأصلي

كما كتبه المؤلفون، بالإنجليزية arXiv:2602.18279

The first measurement of the jet axis decorrelation in events with jets recoiling from an isolated photon is presented for lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The jet axis decorrelation is the angular difference ($$\Delta{j}$$) between two definitions of the jet axis. This quantity is expected to be sensitive to the scattering of jet constituents in the quark-gluon plasma (QGP). Events which have a leading isolated photon with transverse momentum 60 $$\lt$$ $$p_{\mathrm{T}}^{\gamma}$$ $$\lt$$ 200 GeV and recoiling jets with 30 $$\lt$$ $$p_{\mathrm{T}}^{\text{jet}}$$ $$\lt$$ 100 GeV are selected for the analysis. The PbPb result is reported as a function of collision centrality and compared to pp reference data. Jets with $$p_{\mathrm{T}}^{\text{jet}}$$ $$\lt$$ 60 GeV have consistent $$\Delta{j}$$ shapes for pp and PbPb collisions. However, a narrowing is observed for jets with $$p_{\mathrm{T}}^{\text{jet}}$$ $$\gt$$ 60 GeV in central PbPb collisions. The results are compared to predictions from the JEWEL, PYQUEN, and HYBRID theoretical models, which include different descriptions of parton energy loss in the QGP.