HEPData

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...
https://www.hepdata.net/record/data/209215yaml https://www.hepdata.net/record/data/209215/csvcsv
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...
https://www.hepdata.net/record/data/209216yaml https://www.hepdata.net/record/data/209216/csvcsv
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...
https://www.hepdata.net/record/data/209217yaml https://www.hepdata.net/record/data/209217/csvcsv
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...
https://www.hepdata.net/record/data/209218yaml https://www.hepdata.net/record/data/209218/csvcsv
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...
https://www.hepdata.net/record/data/209219yaml https://www.hepdata.net/record/data/209219/csvcsv
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...
https://www.hepdata.net/record/data/209220yaml https://www.hepdata.net/record/data/209220/csvcsv
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...
https://www.hepdata.net/record/data/209221yaml https://www.hepdata.net/record/data/209221/csvcsv
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...
https://www.hepdata.net/record/data/209222yaml https://www.hepdata.net/record/data/209222/csvcsv
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...
https://www.hepdata.net/record/data/209223yaml https://www.hepdata.net/record/data/209223/csvcsv
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...
https://www.hepdata.net/record/data/209224yaml https://www.hepdata.net/record/data/209224/csvcsv
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...
https://www.hepdata.net/record/data/209225yaml https://www.hepdata.net/record/data/209225/csvcsv
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...
https://www.hepdata.net/record/data/209226yaml https://www.hepdata.net/record/data/209226/csvcsv
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...
https://www.hepdata.net/record/data/209227yaml https://www.hepdata.net/record/data/209227/csvcsv
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...
https://www.hepdata.net/record/data/209228yaml https://www.hepdata.net/record/data/209228/csvcsv
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...
https://www.hepdata.net/record/data/209229yaml https://www.hepdata.net/record/data/209229/csvcsv
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...
https://www.hepdata.net/record/data/209230yaml https://www.hepdata.net/record/data/209230/csvcsv
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...
https://www.hepdata.net/record/data/209231yaml https://www.hepdata.net/record/data/209231/csvcsv
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...
https://www.hepdata.net/record/data/209232yaml https://www.hepdata.net/record/data/209232/csvcsv
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...
https://www.hepdata.net/record/data/209233yaml https://www.hepdata.net/record/data/209233/csvcsv
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...
https://www.hepdata.net/record/data/209234yaml https://www.hepdata.net/record/data/209234/csvcsv
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...
https://www.hepdata.net/record/data/209235yaml https://www.hepdata.net/record/data/209235/csvcsv
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...
https://www.hepdata.net/record/data/209236yaml https://www.hepdata.net/record/data/209236/csvcsv
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...
https://www.hepdata.net/record/data/209237yaml https://www.hepdata.net/record/data/209237/csvcsv
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...
https://www.hepdata.net/record/data/209238yaml https://www.hepdata.net/record/data/209238/csvcsv
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...
https://www.hepdata.net/record/data/209239yaml https://www.hepdata.net/record/data/209239/csvcsv
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...
https://www.hepdata.net/record/data/209240yaml https://www.hepdata.net/record/data/209240/csvcsv
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}} =...
https://www.hepdata.net/record/data/209241yaml https://www.hepdata.net/record/data/209241/csvcsv
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...
https://www.hepdata.net/record/data/209242yaml https://www.hepdata.net/record/data/209242/csvcsv
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...
https://www.hepdata.net/record/data/209243yaml https://www.hepdata.net/record/data/209243/csvcsv
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}} =...
https://www.hepdata.net/record/data/209244yaml https://www.hepdata.net/record/data/209244/csvcsv
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...
https://www.hepdata.net/record/data/209245yaml https://www.hepdata.net/record/data/209245/csvcsv
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...
https://www.hepdata.net/record/data/209246yaml https://www.hepdata.net/record/data/209246/csvcsv
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}} =...
https://www.hepdata.net/record/data/209247yaml https://www.hepdata.net/record/data/209247/csvcsv
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...
https://www.hepdata.net/record/data/209248yaml https://www.hepdata.net/record/data/209248/csvcsv
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...
https://www.hepdata.net/record/data/209249yaml https://www.hepdata.net/record/data/209249/csvcsv
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}} =...
https://www.hepdata.net/record/data/209250yaml https://www.hepdata.net/record/data/209250/csvcsv
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...
https://www.hepdata.net/record/data/209251yaml https://www.hepdata.net/record/data/209251/csvcsv
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...
https://www.hepdata.net/record/data/209252yaml https://www.hepdata.net/record/data/209252/csvcsv
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.
https://www.hepdata.net/record/data/209253yaml https://www.hepdata.net/record/data/209253/csvcsv
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...
https://www.hepdata.net/record/data/209254yaml https://www.hepdata.net/record/data/209254/csvcsv
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.
https://www.hepdata.net/record/data/209255yaml https://www.hepdata.net/record/data/209255/csvcsv
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...
https://www.hepdata.net/record/data/209256yaml https://www.hepdata.net/record/data/209256/csvcsv

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