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Measurement of jet suppression in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV

The ALICE collaboration
Phys.Lett. B746 (2015) 1-14, 2015

Abstract (data abstract)
CERN-LHC. The transverse momentum ($p_{\mathrm{T}}$) spectrum and nuclear modification factor (${R}_{\mathrm{AA}}$) of reconstructed jets in $0$-$10$% and $10$-$30$% central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV were measured. Jets were reconstructed from charged and neutral particles, utilizing the ALICE tracking detectors and Electromagnetic Calorimeter (EMCal), with the anti-$k_{\mathrm{T}}$ jet algorithm with a resolution parameter of $R=0.2$. The jet $p_{\mathrm{T}}$ spectra are reported in the pseudorapidity interval of $|{\eta}_{\rm jet}|<0.5$ for $40<{p}_{\mathrm{T,~jet}}<120$ GeV/$c$ in $0$-$10$% and for $30<{p}_{\mathrm{T,~jet}}<100$ GeV/$c$ in $10$-$30$% collisions. Reconstructed jets were required to contain a leading charged particle with $p_{\mathrm{T}}>5$ GeV/$c$ to suppress jets constructed from the combinatorial background in Pb--Pb collisions. The nuclear modification factor is obtained by dividing the jet spectrum measured in Pb--Pb by that in pp collisions scaled by the number of independent nucleon--nucleon collisions estimated using a Glauber model. ${R}_{\mathrm{AA}}$ is found to be $0.28\pm0.04$ in $0$-$10$% and $0.35\pm0.04$ in $10$-$30$% collisions, independent of ${p}_{\mathrm{T,~jet}}$ within the uncertainties of the measurement.

  • Table 1

    Data from F1

    10.17182/hepdata.68483.v1/t1

    The $\delta{p}_{\mathrm{T}}$ distribution for $R=0.2$ with the random-cone and the embedded-track methods in the 10% most central events, with $p_{\mathrm{T}}^{\mathrm{probe}}=60$...

  • Table 2

    Data from F2

    10.17182/hepdata.68483.v1/t2

    The spectra of $R=0.2$ jets with a leading track requirement of $5$ GeV/$c$ in inelastic pp collisions at $\sqrt{s}=2.76$ TeV.

  • Table 3

    Data from F2

    10.17182/hepdata.68483.v1/t3

    The spectra of $R=0.2$ jets with a leading track requirement of $5$ GeV/$c$ in 0-10% and 10-30% most central Pb-Pb...

  • Table 4

    Data from F3

    10.17182/hepdata.68483.v1/t4

    Ratio of the jet spectrum with a leading track $p_{\mathrm{T}}$ > 5 GeV/$c$ over the inclusive jet spectrum for $R=0.2$...

  • Table 5

    Data from F4

    10.17182/hepdata.68483.v1/t5

    Ratios of jet spectra with different leading track $p_{\mathrm{T}}$ requirements ("$0$ over $5$", "$3$ over $5$", "$7$ over $5$" and...

  • Table 6

    Data from F5

    10.17182/hepdata.68483.v1/t6

    $R_{\mathrm{AA}}$ for $R=0.2$ jets with the leading track requirement of $5$ GeV/$c$ in 0-10% most central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$...

  • Table 7

    Data from F5

    10.17182/hepdata.68483.v1/t7

    $R_{\mathrm{AA}}$ for $R=0.2$ jets with the leading track requirement of $5$ GeV/$c$ in 10-30% most central Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$...

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