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Fragmentation Functions for higher pT 100-200 GeV/c

Figure Information
Scope: PWG
PWG-JE (Jets)
Energy
5.02 TeV
System
Pb-Pb
Figure Group
ML background correction for charged jets in PbPb at 5 TeV
Figure Image
Figure image (.eps)
fragmentationR040_HighPt_SimulationFig_0.eps
Figure image (.pdf)
fragmentationR040_HighPt_SimulationFig_0.pdf
Figure Caption

Fragmentation function modifications for the toy models explored in the ML analysis as compared to ATLAS (Phys.Rev.C 98 (2018) 024908) and CMS data (Phys. Rev. Lett. 121 (2018) 242301) for higher pT 100-200 GeV/c. The ATLAS data are for jets with R = 0.4 and pT > 100 GeV/c . The CMS data are for jets with R = 0.3 and pT > 30 GeV/c recoiling of a photon with ET > 60 GeV/c. The toy modifications shown in the plot probe three different ways to modify the fragmentation of the embedded PYTHIA jet. The fractional modifications specify the effect of jet constituents losing a specified fraction of their energy, in this case 25% to align with the naive expectation from the charged hadron Raa. These occur either in cone (delta R = 0.2) or out of cone (delta R = 0.6). The other toy modifications probe the effect of the medium response where all radiated energy is captured in cone, but the original track pT is also not updated, replicating the effects of a medium response. Samples with only quarks or gluons (as identified in PYTHIA) are also shown. 

Detail description

Fragmentation function modifications for the toy models explored in the ML analysis as compared to ATLAS (Phys.Rev.C 98 (2018) 024908) and CMS data (Phys. Rev. Lett. 121 (2018) 242301) for higher pT 100-200 GeV/c. The ATLAS data are for jets with R = 0.4 and pT > 100 GeV/c . The CMS data are for jets with R = 0.3 and pT > 30 GeV/c recoiling of a photon with ET > 60 GeV/c. The toy modifications shown in the plot probe three different ways to modify the fragmentation of the embedded PYTHIA jet. The fractional modifications specify the effect of jet constituents losing a specified fraction of their energy, in this case 25% to align with the naive expectation from the charged hadron Raa. These occur either in cone (delta R = 0.2) or out of cone (delta R = 0.6). The other toy modifications probe the effect of the medium response where all radiated energy is captured in cone, but the original track pT is also not updated, replicating the effects of a medium response. Samples with only quarks or gluons (as identified in PYTHIA) are also shown.