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First measurement of jet mass in Pb–Pb and p–Pb collisions at the LHC

The collaboration
Phys.Lett.B 776 (2018) 249-264, 2018.

Abstract
This letter presents the first measurement of jet mass in Pb-Pb and p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV and 5.02 TeV, respectively. Both the jet energy and the jet mass are expected to be sensitive to jet quenching in the hot Quantum Chromodynamics (QCD) matter created in nuclear collisions at collider energies. Jets are reconstructed from charged particles using the anti-$k_{\rm T}$ jet algorithm and resolution parameter $R = 0.4$. The jets are measured in the pseudorapidity range $|\eta_{\rm{jet}}|<0.5$ and in three intervals of transverse momentum between 60 GeV/$c$ and 120 GeV/$c$. The measurement of the jet mass in central Pb-Pb collisions is compared to the jet mass as measured in p-Pb reference collisions, to vacuum event generators, and to models including jet quenching. It is observed that the jet mass in central Pb-Pb collisions is consistent within uncertainties with p-Pb reference measurements. Furthermore, the measured jet mass in Pb-Pb collisions is not reproduced by the quenching models considered in this letter and is found to be consistent with PYTHIA expectations within systematic uncertainties.

• #### Table 1

data from Fig. 6 and 7

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Jet mass distribution in pPb collisions at cme 5020 GeV, pT,jet ch = 60-80 GeV/c

• #### Table 2

data from Fig. 6 and 7

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Jet mass distribution in pPb collisions at cme 5020 GeV, pT,jet ch = 80-100 GeV/c

• #### Table 3

data from Fig. 6 and 7

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Jet mass distribution in pPb collisions at cme 5020 GeV, pT,jet ch = 100-120 GeV/c

• #### Table 4

data from Fig. 7 and 10

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Jet mass distribution in PbPb collisions at cme 2760 GeV, pT,jet ch = 60-80 GeV/c

• #### Table 5

data from Fig. 7 and 10

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Jet mass distribution in PbPb collisions at cme 2760 GeV, pT,jet ch = 80-100 GeV/c

• #### Table 6

data from Fig. 7 and 10

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Jet mass distribution in PbPb collisions at cme 2760 GeV, pT,jet ch = 100-120 GeV/c

• #### Table 7

data from Fig. 9

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Mean of the jet mass distributions in pPb collisions as a function of pTjet ch

• #### Table 8

data from Fig. 9 and 11

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Mean of the jet mass distributions in PbPb collisions as a function of pTjet ch