Theory meets data: How a simple cut changes the story. (IMAGE)
Caption
A comparison of theoretical calculations (lines) with CMS experimental data (points) for the jet “girth” (angular width) in lead-lead (PbPb) collisions shows that the observed QGP effect depends critically on a kinematic selection. The theory-data agreement demonstrates that applying a loose cut (xjγ > 0.4, upper panel) results in an apparent jet broadening (PbPb/pp ratio > 1), while a tight cut (xjγ > 0.8, lower panel) leads to an apparent jet narrowing (ratio < 1). This proves the initial observation is dictated by the experimental selection criterion, not an intrinsic property of the QGP.
Credit
Sa Wang
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CC BY-NC