• Browse all
Measurements of jet quenching with semi-inclusive hadron+jet distributions in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

The STAR collaboration
No Journal Information, 2017

Abstract
The STAR Collaboration reports the measurement of semi-inclusive distributions of charged-particle jets recoiling from a high transverse momentum hadron trigger, in central and peripheral Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Charged jets are reconstructed with the anti-kT algorithm for jet radii R between 0.2 and 0.5 and with low infrared cutoff of track constituents ($p_T>0.2$ GeV/c). A novel mixed-event technique is used to correct the large uncorrelated background present in heavy ion collisions. Corrected recoil jet distributions are reported at mid-rapidity, for charged-jet transverse momentum $p_T^\mathrm{jet,ch}<30$ GeV/c. Comparison is made to similar measurements for Pb+Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV, to calculations for p+p collisions at $\sqrt{s}$ = 200 GeV based on the PYTHIA Monte Carlo generator and on a Next-to-Leading Order perturbative QCD approach, and to theoretical calculations incorporating jet quenching. The recoil jet yield is suppressed in central relative to peripheral collisions, with the magnitude of the suppression corresponding to medium-induced charged energy transport out of the jet cone of $2.8\pm0.2\mathrm{(stat)}\pm1.5\mathrm{(sys)}$ GeV/c, for $10<p_T^\mathrm{jet,ch}<20$ GeV/c and R = 0.5. No medium-induced change in jet shape is observed for $R<0.5$. The azimuthal distribution of low-$p_T^\mathrm{jet,ch}$ recoil jets may be enhanced at large azimuthal angles to the trigger axis, due to scattering off quasi-particles in the hot QCD medium. Measurement of this distribution gives a 90% statistical confidence upper limit to the yield enhancement at large deflection angles in central Au+Au collisions of $50\pm30\mathrm{(sys)\%}$ of the large-angle yield in p+pcollisions predicted by PYTHIA.

  • Table 1

    Data from Figure 7(a)

    10.17182/hepdata.77790.v1/t1

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.2 jets in central...

  • Table 2

    Data from Figure 7(a)

    10.17182/hepdata.77790.v1/t2

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.2 jets in central...

  • Table 3

    Data from Figure 7(b)

    10.17182/hepdata.77790.v1/t3

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.2 jets in peripheral...

  • Table 4

    Data from Figure 7(b)

    10.17182/hepdata.77790.v1/t4

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.2 jets in peripheral...

  • Table 5

    Data from Figure 7(c)

    10.17182/hepdata.77790.v1/t5

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.3 jets in central...

  • Table 6

    Data from Figure 7(c)

    10.17182/hepdata.77790.v1/t6

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.3 jets in central...

  • Table 7

    Data from Figure 7(d)

    10.17182/hepdata.77790.v1/t7

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.3 jets in peripheral...

  • Table 8

    Data from Figure 7(d)

    10.17182/hepdata.77790.v1/t8

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.3 jets in peripheral...

  • Table 9

    Data from Figure 8(a)

    10.17182/hepdata.77790.v1/t9

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.4 jets in central...

  • Table 10

    Data from Figure 8(a)

    10.17182/hepdata.77790.v1/t10

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.4 jets in central...

  • Table 11

    Data from Figure 8(b)

    10.17182/hepdata.77790.v1/t11

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.4 jets in peripheral...

  • Table 12

    Data from Figure 8(b)

    10.17182/hepdata.77790.v1/t12

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.4 jets in peripheral...

  • Table 13

    Data from Figure 8(c)

    10.17182/hepdata.77790.v1/t13

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.5 jets in central...

  • Table 14

    Data from Figure 8(c)

    10.17182/hepdata.77790.v1/t14

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.5 jets in central...

  • Table 15

    Data from Figure 8(d)

    10.17182/hepdata.77790.v1/t15

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.5 jets in peripheral...

  • Table 16

    Data from Figure 8(d)

    10.17182/hepdata.77790.v1/t16

    Distribution of p_{T,jet}^{reco,ch} for Au + Au collisions at \sqrt{s_{NN}} = 200 GeV for R = 0.5 jets in peripheral...

  • Table 17

    Data from Figure 10(c)

    10.17182/hepdata.77790.v1/t17

    Recoil jet distributions for peripheral Au+Au STAR events after mixed event subtraction as a function of \Delta\phi for p_{T,jet}^{reco,ch} range...

  • Table 18

    Data from Figure 10(d)

    10.17182/hepdata.77790.v1/t18

    Recoil jet distributions after mixed event subtraction as a function of \Delta\phi for p_{T,jet}^{reco,ch} range of 9-13 GeV/c for p+p...

  • Table 19

    Data from Figure 10(e)

    10.17182/hepdata.77790.v1/t19

    Recoil jet distributions for peripheral Au+Au STAR events after mixed event subtraction as a function of \Delta\phi for p_{T,jet}^{reco,ch} range...

  • Table 20

    Data from Figure 10(f)

    10.17182/hepdata.77790.v1/t20

    Recoil jet distributions after mixed event subtraction as a function of \Delta\phi for p_{T,jet}^{reco,ch} range of 13-33 GeV/c for p+p...

  • Table 21

    Data from Figure 11(c)

    10.17182/hepdata.77790.v1/t21

    Recoil jet distributions for central Au+Au STAR events after mixed event subtraction as a function of \Delta\phi for p_{T,jet}^{reco,ch} range...

  • Table 22

    Data from Figure 11(d)

    10.17182/hepdata.77790.v1/t22

    Recoil jet distributions after mixed event subtraction as a function of \Delta\phi for p_{T,jet}^{reco,ch} range of 9-13 GeV/c for p+p...

  • Table 23

    Data from Figure 11(e)

    10.17182/hepdata.77790.v1/t23

    Recoil jet distributions for central Au+Au STAR events after mixed event subtraction as a function of \Delta\phi for p_{T,jet}^{reco,ch} range...

  • Table 24

    Data from Figure 11(f)

    10.17182/hepdata.77790.v1/t24

    Recoil jet distributions after mixed event subtraction as a function of \Delta\phi for p_{T,jet}^{reco,ch} range of 13-33 GeV/c for p+p...

  • Table 25

    Data from Figure 19(a)

    10.17182/hepdata.77790.v1/t25

    Fully corrected distributions of Y(p_{t,jet}^{ch}) for central AU + Au collisions at \sqrt{s_{NN}} = 200 GeV, for anti-k_T jets with...

  • Table 26

    Data from Figure 19(a)

    10.17182/hepdata.77790.v1/t26

    Fully corrected distributions of Y(p_{t,jet}^{ch}) for peripheral AU + Au collisions at \sqrt{s_{NN}} = 200 GeV, for anti-k_T jets with...

  • Table 27

    Data from Figure 19(a)

    10.17182/hepdata.77790.v1/t27

    Ratio of fully corrected distributions of Y(p_{t,jet}^{ch}) of central to peripheral events for AU + Au collisions at \sqrt{s_{NN}} =...

  • Table 28

    Data from Figure 19(b)

    10.17182/hepdata.77790.v1/t28

    Fully corrected distributions of Y(p_{t,jet}^{ch}) for central AU + Au collisions at \sqrt{s_{NN}} = 200 GeV, for anti-k_T jets with...

  • Table 29

    Data from Figure 19(b)

    10.17182/hepdata.77790.v1/t29

    Fully corrected distributions of Y(p_{t,jet}^{ch}) for peripheral AU + Au collisions at \sqrt{s_{NN}} = 200 GeV, for anti-k_T jets with...

  • Table 30

    Data from Figure 19(b)

    10.17182/hepdata.77790.v1/t30

    Ratio of fully corrected distributions of Y(p_{t,jet}^{ch}) of central to peripheral events for AU + Au collisions at \sqrt{s_{NN}} =...

  • Table 31

    Data from Figure 19(c)

    10.17182/hepdata.77790.v1/t31

    Fully corrected distributions of Y(p_{t,jet}^{ch}) for central AU + Au collisions at \sqrt{s_{NN}} = 200 GeV, for anti-k_T jets with...

  • Table 32

    Data from Figure 19(c)

    10.17182/hepdata.77790.v1/t32

    Fully corrected distributions of Y(p_{t,jet}^{ch}) for peripheral AU + Au collisions at \sqrt{s_{NN}} = 200 GeV, for anti-k_T jets with...

  • Table 33

    Data from Figure 19(c)

    10.17182/hepdata.77790.v1/t33

    Ratio of fully corrected distributions of Y(p_{t,jet}^{ch}) of central to peripheral events for AU + Au collisions at \sqrt{s_{NN}} =...

  • Table 34

    Data from Figure 19(d)

    10.17182/hepdata.77790.v1/t34

    Fully corrected distributions of Y(p_{t,jet}^{ch}) for central AU + Au collisions at \sqrt{s_{NN}} = 200 GeV, for anti-k_T jets with...

  • Table 35

    Data from Figure 19(d)

    10.17182/hepdata.77790.v1/t35

    Fully corrected distributions of Y(p_{t,jet}^{ch}) for peripheral AU + Au collisions at \sqrt{s_{NN}} = 200 GeV, for anti-k_T jets with...

  • Table 36

    Data from Figure 19(d)

    10.17182/hepdata.77790.v1/t36

    Ratio of fully corrected distributions of Y(p_{t,jet}^{ch}) of central to peripheral events for AU + Au collisions at \sqrt{s_{NN}} =...

  • Table 37

    Data from Figure 20(a) Lower Panel

    10.17182/hepdata.77790.v1/t37

    Ratio of distributions of Y(p_{T,jet}^{ch}) for R = 0.2 to R = 0.5 in peripheral Au + Au collisions at...

  • Table 38

    Data from Figure 20(b) Lower Panel

    10.17182/hepdata.77790.v1/t38

    Ratio of distributions of Y(p_{T,jet}^{ch}) for R = 0.2 to R = 0.5 in central Au + Au collisions at...

  • Table 39

    Data from Figure 21 Middle and Bottom Panel (Gray Stars)

    10.17182/hepdata.77790.v1/t39

    Azimuthal distribution of recoil jets, \PSI(\DELTA\phi) in central Au + Au collisions at \sqrt{s_{NN}} = 200 GeV measured at STAR.

  • Table 40

    Data from Figure 21 Top Panel (Red Stars)

    10.17182/hepdata.77790.v1/t40

    Azimuthal distribution of R=0.3 recoil jets, \PSI(\DELTA\phi) in peripheral Au + Au collisions at \sqrt{s_{NN}} = 200 GeV measured at...

  • Table 41

    Data from Figure 21 Top Panel (Dashed Red Line)

    10.17182/hepdata.77790.v1/t41

    Azimuthal distribution of recoil jets, \PSI(\DELTA\phi) in PYTHIA generated pp collisiions at sqrt{s_{NN}} = 200 GeV.

  • Table 42

    Data from Figure 21 Middle Panel (Red Colored Curve)

    10.17182/hepdata.77790.v1/t42

    Azimuthal distribution of recoil jets, \PSI(\DELTA\phi) in PYTHIA generated pp collisiions embedded in central Au + Au Mixed Events at...

Loading Data...