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Measurement of jet quenching with semi-inclusive hadron-jet distributions in central Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}}=2.76 $ TeV

The ALICE collaboration
JHEP 1509 (2015) 170, 2015

Abstract (data abstract)
CERN-LHC. We report the measurement of a new observable of jet quenching in central Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV, based on the semi-inclusive rate of charged jets recoiling from a high transverse momentum (high-$p_{\rm T}$) charged hadron trigger. Jets are measured using collinear-safe jet reconstruction with infrared cutoff for jet constituents of 0.15 GeV/$c$, for jet resolution parameters $R = 0.2$, 0.4 and 0.5. Underlying event background is corrected at the event-ensemble level, without imposing bias on the jet population. Recoil jet spectra are reported in the range $20 < p_\mathrm{T,jet}^\mathrm{ch} < 100$ GeV/$c$. Reference distributions for pp collisions at $\sqrt{s} = 2.76$ TeV are calculated using Monte Carlo and NLO pQCD methods, which are validated by comparing with measurements in pp collisions at $\sqrt{s} = 7$ TeV. The recoil jet yield in central Pb-Pb collisions is found to be suppressed relative to that in pp collisions. No significant medium-induced broadening of the intra-jet energy profile is observed within 0.5 radians relative to the recoil jet axis. The angular distribution of the recoil jet yield relative to the trigger axis is found to be similar in central Pb-Pb and pp collisions, with no significant medium-induced acoplanarity observed. Large-angle jet deflection, which may provide a direct probe of the nature of the quasi-particles in hot QCD matter, is explored.

  • Table 1

    Data from Figure 1. Upper Panel

    10.17182/hepdata.69868.v1/t1

    Raw per trigger normalized yields of charged jets in the recoil region associated to a trigger hadron with pT (8,9)...

  • Table 2

    Data from Figure 1. Upper Panel

    10.17182/hepdata.69868.v1/t2

    Raw per trigger normalized yields of charged jets in the recoil region associated to a trigger hadron with pT (20,50)...

  • Table 3

    Data from Figure 1. Middle Panel

    10.17182/hepdata.69868.v1/t3

    Per trigger normalized yields of charged jets in the recoil region associated to a trigger hadron with pT (8,9) GeV/c...

  • Table 4

    Data from Figure 1. Middle Panel

    10.17182/hepdata.69868.v1/t4

    Per trigger normalized yields of charged jets in the recoil region associated to a trigger hadron with pT (20,50) GeV/c...

  • Table 5

    Data from Figure 1. Lower Panel

    10.17182/hepdata.69868.v1/t5

    Per trigger normalized raw recoil jet yield in hadron trigger bin of {8,9} GeV. The recoil jet yield is measured...

  • Table 6

    Data from Figure 1. Lower Panel

    10.17182/hepdata.69868.v1/t6

    Per trigger normalized raw recoil jet yield in hadron trigger bin of {20,50} GeV. The recoil jet yield is measured...

  • Table 7

    Data from Figure 2. Upper Left Panel

    10.17182/hepdata.69868.v1/t7

    Per trigger normalized raw recoil jet yield in hadron trigger bin of {8,9} GeV. The recoil jet yield is measured...

  • Table 8

    Data from Figure 2. Upper Left Panel

    10.17182/hepdata.69868.v1/t8

    Per trigger normalized raw recoil jet yield in hadron trigger bin of {20,50} GeV. The recoil jet yield is measured...

  • Table 9

    Data from Figure 2. Upper Right Panel

    10.17182/hepdata.69868.v1/t9

    Raw ratio of the per trigger normalized recoil jet yield in hadron trigger bin of {20,50} relative to the same...

  • Table 10

    Data from Figure 2. Middle Left Panel

    10.17182/hepdata.69868.v1/t10

    Per trigger normalized raw recoil jet yield in hadron trigger bin of {8,9} GeV. The recoil jet yield is measured...

  • Table 11

    Data from Figure 2. Middle Right Panel

    10.17182/hepdata.69868.v1/t11

    Per trigger normalized raw recoil jet yield in hadron trigger bin of {20,50} GeV. The recoil jet yield is measured...

  • Table 12

    Data from Figure 2. Lower Left Panel

    10.17182/hepdata.69868.v1/t12

    Raw ratio of the per trigger normalized recoil jet yield in hadron trigger bin of {20,50} relative to the same...

  • Table 13

    Data from Figure 2. Lower Left Panel

    10.17182/hepdata.69868.v1/t13

    Per trigger normalized raw recoil jet yield in hadron trigger bin of {20,50} GeV. The recoil jet yield is measured...

  • Table 14

    Data from Figure 2. Lower Right Panel

    10.17182/hepdata.69868.v1/t14

    Per trigger normalized raw recoil jet yield in hadron trigger bin of [20,50] GeV. The recoil jet yield is measured...

  • Table 15

    Data from Figure 2. Lower Right Panel

    10.17182/hepdata.69868.v1/t15

    Raw ratio of the per trigger normalized recoil jet yield in hadron trigger bin of {20,50} relative to the same...

  • Table 16

    Data from Figure 3. Upper Left Panel

    10.17182/hepdata.69868.v1/t16

    Raw difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9}...

  • Table 17

    Data from Figure 3. Upper Right Panel

    10.17182/hepdata.69868.v1/t17

    Raw difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9}...

  • Table 18

    Data from Figure 3. Middle Left Panel

    10.17182/hepdata.69868.v1/t18

    Raw difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9}...

  • Table 19

    Data from Figure 3. Middle Right Panel

    10.17182/hepdata.69868.v1/t19

    Raw difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9}...

  • Table 20

    Data from Figure 3. Lower Left Panel

    10.17182/hepdata.69868.v1/t20

    Raw difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9}...

  • Table 21

    Data from Figure 3. Lower Right Panel

    10.17182/hepdata.69868.v1/t21

    Raw difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9}...

  • Table 22

    Data from Figure 4. Left Panel

    10.17182/hepdata.69868.v1/t22

    Azimuthal correlation between a trigger hadron (TT[8,9]) and recoil jets ($R$ = 0.4, 40 < $p_{T,jet}^{reco,ch}$ < 60 GeV/$c$) in...

  • Table 23

    Data from Figure 4. Left Panel

    10.17182/hepdata.69868.v1/t23

    Azimuthal correlation between a trigger hadron (TT[20,50]) and recoil jets ($R$ = 0.4, 40 < $p_{T,jet}^{reco,ch}$ < 60 GeV/$c$) in...

  • Table 24

    Data from Figure 4. Left Panel

    10.17182/hepdata.69868.v1/t24

    Difference of azimuthal correlations between a trigger hadron (TT[20,50]-[8,9]) and recoil jets ($R$ = 0.4, 40 < $p_{T,jet}^{reco,ch}$ < 60...

  • Table 25

    Data from Figure 4. Right Panel

    10.17182/hepdata.69868.v1/t25

    Integrated yield for jets ($R$ = 0.4, 40 < $p_{T,jet}}^{reco,ch}$ < 60 GeV/$c$) recoiling from a trigger hadron (TT[8,9]) above...

  • Table 26

    Data from F 4b

    10.17182/hepdata.69868.v1/t26

    Integrated yield for jets ($R$ = 0.4, 40 < $p_{T,jet}^{reco,ch}$ < 60 GeV/$c$) recoiling from a trigger hadron (TT[20,50]) above...

  • Table 27

    Data from Figure 4. Right Panel

    10.17182/hepdata.69868.v1/t27

    Difference of the integrated yield for jets ($R$ = 0.4, 40 < $p_{T,jet}^{reco,ch}$ < 60 GeV/$c$) recoiling from a trigger...

  • Table 28

    Data from Figure 6

    10.17182/hepdata.69868.v1/t28

    Difference of per trigger normalized yields of charged jets in the recoil region associated to a trigger hadron with pT...

  • Table 29

    Data from Figure 7

    10.17182/hepdata.69868.v1/t29

    Ratio of Delta_{recoil} distributions corresponding to recoil jets with R=0.2 and R=0.5.

  • Table 30

    Data from Figure 8

    10.17182/hepdata.69868.v1/t30

    Difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9} GeV....

  • Table 31

    Data from Figure 8

    10.17182/hepdata.69868.v1/t31

    Difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9} GeV....

  • Table 32

    Data from Figure 9. Upper Panel

    10.17182/hepdata.69868.v1/t32

    Difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9} GeV...

  • Table 33

    Data from Figure 9. Middle Panel

    10.17182/hepdata.69868.v1/t33

    Difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9} GeV...

  • Table 34

    Data from Figure 9. Lower Panel

    10.17182/hepdata.69868.v1/t34

    Difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9} GeV...

  • Table 35

    Data from Figure 10. Upper Panel

    10.17182/hepdata.69868.v1/t35

    Difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9} GeV...

  • Table 36

    Data from Figure 10. Lower Panel

    10.17182/hepdata.69868.v1/t36

    Difference of the per trigger normalized recoil jet yield in two exclusive hadron trigger bins of {20,50} and {8,9} GeV...

  • Table 37

    Data from Figure 11

    10.17182/hepdata.69868.v1/t37

    Difference of azimuthal correlations between a trigger hadron (TT[20,50]-[8,9]) and recoil jets ($R$ = 0.4, 40 < $p_{T,jet}^{reco,ch}$ < 60...

  • Table 38

    Data from Figure 12. Left Panel

    10.17182/hepdata.69868.v1/t38

    Ratio of the difference of the integrated yield for jets ($R$ = 0.4, 40 < $p_{T,jet}^{reco,ch}$ < 60 GeV/$c$) recoiling...

  • Table 39

    Data from Figure 12. Right Panel

    10.17182/hepdata.69868.v1/t39

    Ratio of the difference of the integrated yield for jets ($R$ = 0.4, 40 < $p_{T,jet}^{reco,ch}$ < 60 GeV/$c$) recoiling...

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