Quantifying the selection bias: The lost jets. (IMAGE)
Caption
This simulation reveals the cause of the contradiction shown in Fig. 2: selection bias. It tracks individual jets, showing the initial distribution of the key variable xjγ (solid curve). After traversing the QGP, energy loss shifts the distribution to lower values (dashed curve). The shaded “lost” region represents jets that fall below the experimental xjγ cut and are discarded. A tight cut (xjγ > 0.8) excludes 58.4% of the quenched jets, creating a heavily biased sample. A loose cut (xjγ > 0.4) retains most of them, providing a faithful sample for analysis.
Credit
Sa Wang
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License
CC BY-NC