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Dihadron azimuthal correlations in Au$+$Au collisions at $\sqrt{s_{NN}}=$ 200 GeV

The PHENIX collaboration
Phys.Rev.C 78 (2008) 014901, 2008.

Abstract (data abstract)
BNL-RHIC. Azimuthal angle ($\Delta\phi$) correlations are presented for a broad range of transverse momentum ($0.4 < p_T < 10$ GeV/$c$) and centrality (0-92\%) selections for charged hadrons from di-jets in Au+Au collisions at $\sqrt{s}_{NN}$ = 200 GeV. With increasing $p_T$, the away-side $\Delta\phi$ distribution evolves from a broad and relatively flat shape to a concave shape, then to a convex shape. Comparisons to p+p data suggest that the away-side distribution can be divided into a partially suppressed $\Delta\phi$ region centered at $\pi$, and an enhanced $\Delta\phi$ region centered at $\pi \pm 1.1$. The $p_T$ spectrum for the associated hadrons in the head region softens toward central collisions. The spectral slope for the shoulder region is independent of centrality and trigger $p_T$ . The properties of the near-side distributions are also modified relative to those in p+p collisions, reflected by the broadening of the jet shape in $\Delta\phi$ and $\Delta\eta$, and an enhancement of the per-trigger yield. However, these modifications seem to be limited to $p_T < 4$ GeV/$c$, above which both the hadron pair shape and per-trigger yield become similar to p+p collisions. These observations suggest that both the away- and near-side distributions contain a jet fragmentation component which dominates for $p_T > 5$ GeV and a medium-induced component which is important for $p_T < 4$ GeV/$c$. We also quantify the role of jets at intermediate and low $p_T$ through the yield of jet-induced pairs in comparison to binary scaled p+p pair yield. The yield of jet-induced pairs is suppressed at high pair proxy energy (sum of the $p_T$ magnitudes of the two hadrons) and is enhanced at low pair proxy energy. The former is consistent with jet quenching; the latter is consistent with the enhancement of soft hadron pairs due to transport of lost energy to lower $p_T$.

  • Figure 4, 2 - 3 GeV/$c$

    10.17182/hepdata.96764.v1/t1

    The 0-20% Au+Au jet-induced hadron-pair yield $\Delta\phi$ distributions calculated from the per-trigger yield using low-$p_T$ hadrons as triggers and high-$p_T$...

  • Figure 4, 3 - 4 GeV/$c$

    10.17182/hepdata.96764.v1/t2

    The 0-20% Au+Au jet-induced hadron-pair yield $\Delta\phi$ distributions calculated from the per-trigger yield using low-$p_T$ hadrons as triggers and high-$p_T$...

  • Figure 4, 4 - 5 GeV/$c$

    10.17182/hepdata.96764.v1/t3

    The 0-20% Au+Au jet-induced hadron-pair yield $\Delta\phi$ distributions calculated from the per-trigger yield using low-$p_T$ hadrons as triggers and high-$p_T$...

  • Figure 6, pp, part 2/2

    10.17182/hepdata.96764.v1/t4

    Per-trigger yield versus $\Delta\phi$ for various trigger and partner $p_T$ ($p^a_T \otimes p^b_T$), arranged by increasing pair proxy energy (sum...

  • Figure 6, pp, part 1/2

    10.17182/hepdata.96764.v1/t5

    Per-trigger yield versus $\Delta\phi$ for various trigger and partner $p_T$ ($p^a_T \otimes p^b_T$), arranged by increasing pair proxy energy (sum...

  • Figure 6, AuAu, part 1/2

    10.17182/hepdata.96764.v1/t6

    Per-trigger yield versus $\Delta\phi$ for various trigger and partner $p_T$ ($p^a_T \otimes p^b_T$), arranged by increasing pair proxy energy (sum...

  • Figure 6, AuAu, part 2/2

    10.17182/hepdata.96764.v1/t7

    Per-trigger yield versus $\Delta\phi$ for various trigger and partner $p_T$ ($p^a_T \otimes p^b_T$), arranged by increasing pair proxy energy (sum...

  • Figure 7, p + p collisions

    10.17182/hepdata.96764.v1/t8

    RHS versus $p^b_T$ for p + p collisions for four trigger selections.

  • Figure 7, Au + Au collisions

    10.17182/hepdata.96764.v1/t9

    RHS versus $p^b_T$ for Au + Au collisions for four trigger selections.

  • Figure 8

    10.17182/hepdata.96764.v1/t10

    RHS versus $N_{part}$ for 2-3 $\otimes$ 2-3 GeV/$c$. Shaded bars (brackets) represent $p_T$ -correlated uncertainties due to elliptic flow (ZYAM...

  • Figure 9

    10.17182/hepdata.96764.v1/t11

    Per-trigger yield $\Delta\phi$ distribution and corresponding fits for 2−3 $\otimes$ 2−3 GeV/c in 0-5% Au+Au collisions.

  • Figure 10

    10.17182/hepdata.96764.v1/t12

    a) D versus $N_{part}$ from FIT 1 and FIT2 for 2 - 3 GeV/$c$ bin. The error bars are the...

  • Figure 11, FIT1, 2-3

    10.17182/hepdata.96764.v1/t13

    Values of D determined from FIT1 as function of partner $p_T$ for 2-3 GeV/c $p_T$ range in 0-20% Au+Au.

  • Figure 11, FIT1, 3-4

    10.17182/hepdata.96764.v1/t14

    Values of D determined from FIT1 as function of partner $p_T$ for 3-4 GeV/c $p_T$ range in 0-20% Au+Au.

  • Figure 11, FIT1, 4-5

    10.17182/hepdata.96764.v1/t15

    Values of D determined from FIT1 as function of partner $p_T$ for 4-5 GeV/c $p_T$ range in 0-20% Au+Au.

  • Figure 11, FIT2, 2-3

    10.17182/hepdata.96764.v1/t16

    Values of D determined from FIT2 as function of partner $p_T$ for 2-3 GeV/c $p_T$ range in 0-20% Au+Au.

  • Figure 11, FIT2, 3-4

    10.17182/hepdata.96764.v1/t17

    Values of D determined from FIT2 as function of partner $p_T$ for 3-4 GeV/c $p_T$ range in 0-20% Au+Au.

  • Figure 11, FIT2, 4-5

    10.17182/hepdata.96764.v1/t18

    Values of D determined from FIT2 as function of partner $p_T$ for 4-5 GeV/c $p_T$ range in 0-20% Au+Au.

  • Figure 12, 0-20%, head

    10.17182/hepdata.96764.v1/t19

    Per-trigger yield as function of partner $p_T$ for the HR region for the 0-20% Au + Au collisions. Results for...

  • Figure 12, 20-40%, head

    10.17182/hepdata.96764.v1/t20

    Per-trigger yield as function of partner $p_T$ for the HR region for the 20-40% Au + Au collisions. Results for...

  • Figure 12, 40-60%, head

    10.17182/hepdata.96764.v1/t21

    Per-trigger yield as function of partner $p_T$ for the HR region for the 40-60% Au + Au collisions. Results for...

  • Figure 12, 60-92%, head

    10.17182/hepdata.96764.v1/t22

    Per-trigger yield as function of partner $p_T$ for the HR region for the 60-92% Au + Au collisions. Results for...

  • Figure 12, p + p, head

    10.17182/hepdata.96764.v1/t23

    Per-trigger yield as function of partner $p_T$ for the HR region for the p + p collisions. Results for four...

  • Figure 12, 0-20%, shoulder

    10.17182/hepdata.96764.v1/t24

    Per-trigger yield as function of partner $p_T$ for the SR region for the 0-20% Au + Au collisions. Results for...

  • Figure 12, 20-40%, shoulder

    10.17182/hepdata.96764.v1/t25

    Per-trigger yield as function of partner $p_T$ for the SR region for the 20-40% Au + Au collisions. Results for...

  • Figure 12, 40-60%, shoulder

    10.17182/hepdata.96764.v1/t26

    Per-trigger yield as function of partner $p_T$ for the SR region for the 40-60% Au + Au collisions. Results for...

  • Figure 12, 60-92%, shoulder

    10.17182/hepdata.96764.v1/t27

    Per-trigger yield as function of partner $p_T$ for the SR region for the 60-92% Au + Au collisions. Results for...

  • Figure 12, p + p, shoulder

    10.17182/hepdata.96764.v1/t28

    Per-trigger yield as function of partner $p_T$ for the SR region for the p + p collisions. Results for four...

  • Figure 16, Au + Au

    10.17182/hepdata.96764.v1/t29

    Near-side Gaussian widths versus partner $p_T$ for four trigger $p_T$ ranges for 0-20 % Au + Au.

  • Figure 16, p + p

    10.17182/hepdata.96764.v1/t30

    Near-side Gaussian widths versus partner $p_T$ for four trigger $p_T$ ranges for 0-20 % p + p.

  • Figure 17

    10.17182/hepdata.96764.v1/t31

    Near-side Gaussian widths versus $N_{part}$ for five successively increasing $p^a_T$ $\otimes$ $p^b_T$. The most left point in each panel represents...

  • Figure 18, p + p, near-side

    10.17182/hepdata.96764.v1/t32

    Near-side yield in $\lvert \Delta\phi \rvert$ < $\pi$/3 versus partner $p_T$ for four trigger $p_T$ selections for 0-20% p +...

  • Figure 18, 0-20%, near-side

    10.17182/hepdata.96764.v1/t33

    Near-side yield in $\lvert \Delta\phi \rvert$ < $\pi$/3 versus partner $p_T$ for four trigger $p_T$ selections for 0-20% Au +...

  • Figure 23, AuAu

    10.17182/hepdata.96764.v1/t34

    Per-trigger yield versus $\Delta\eta$ for 0-20% central Au + Au collisions. Results are shown for four $p^a_T \otimes p^b_T$ selections...

  • Figure 23, pp

    10.17182/hepdata.96764.v1/t35

    Per-trigger yield versus $\Delta\eta$ for 0-20% central p + p collisions. Results are shown for four $p^a_T \otimes p^b_T$ selections...

  • Figure 24, eta

    10.17182/hepdata.96764.v1/t36

    The projection of 2-D per-trigger yield in $\lvert \Delta\eta \rvert$ < 0.7 $\otimes$ $\lvert \Delta\phi \rvert$ < 0.7 and 0-20%...

  • Figure 24, phi

    10.17182/hepdata.96764.v1/t37

    The projection of 2-D per-trigger yield in $\lvert \Delta\eta \rvert$ < 0.7 $\otimes$ $\lvert \Delta\phi \rvert$ < 0.7 and 0-20%...

  • Figure 25, head

    10.17182/hepdata.96764.v1/t38

    Truncated mean $p_T$, $\langle p_T \rangle$, in 1 <pbT < 5 GeV/c versus $N_{part}$ for the head region for Au...

  • Figure 25, away-side shoulder

    10.17182/hepdata.96764.v1/t39

    Truncated mean $p_T$, $\langle p_T \rangle$, in 1 <pbT < 5 GeV/c versus $N_{part}$ for the away-side shoulder region for...

  • Figure 25, near-side

    10.17182/hepdata.96764.v1/t40

    Truncated mean $p_T$, $\langle p_T \rangle$, in 1 <pbT < 5 GeV/c versus $N_{part}$ for the near-side region for Au...

  • Figure 26, 3 − 4 GeV/c

    10.17182/hepdata.96764.v1/t41

    Truncated mean $p_T$, $\langle p_T \rangle$, calculated for five partner pT ranges in the HR. Results for triggers in 3...

  • Figure 26, 4 − 5 GeV/c

    10.17182/hepdata.96764.v1/t42

    Truncated mean $p_T$, $\langle p_T \rangle$, calculated for five partner pT ranges in the HR. Results for triggers in 4...

  • Figure 28

    10.17182/hepdata.96764.v1/t43

    The near-side pair suppression factor $J_{AA}$ in 0-20% Au + Au collisions as function of $p^b_T$ for various ranges of...

  • Figure 30, 20-40%

    10.17182/hepdata.96764.v1/t44

    The near-side $J_{AA}$ as function of $p^b_T$ and $p^{sum}_T$ for four $p^a_T$ bins and three centrality bins. Data for 20-40%.

  • Figure 30, 40-60%

    10.17182/hepdata.96764.v1/t45

    The near-side $J_{AA}$ as function of $p^b_T$ and $p^{sum}_T$ for four $p^a_T$ bins and three centrality bins. Data for 40-60%.

  • Figure 30, 60-92%

    10.17182/hepdata.96764.v1/t46

    The near-side $J_{AA}$ as function of $p^b_T$ and $p^{sum}_T$ for four $p^a_T$ bins and three centrality bins. Data for 60-92%.

  • Figure 31, 0-20%, away-side

    10.17182/hepdata.96764.v1/t47

    The pair suppression factor $J_{AA}$ for the away-side HR in 0-20% Au + Au collisions as function of $p_b^T$ for...

  • Figure 31, 20-40%, away-side

    10.17182/hepdata.96764.v1/t48

    The pair suppression factor $J_{AA}$ for the away-side HR in 20-40% Au + Au collisions as function of $p_b^T$ for...

  • Figure 31, 40-60%, away-side

    10.17182/hepdata.96764.v1/t49

    The pair suppression factor $J_{AA}$ for the away-side HR in 40-60% Au + Au collisions as function of $p_b^T$ for...

  • Figure 31, 60-92%, away-side

    10.17182/hepdata.96764.v1/t50

    The pair suppression factor $J_{AA}$ for the away-side HR in 60-92% Au + Au collisions as function of $p_b^T$ for...

  • Figure 36, Au + Au

    10.17182/hepdata.96764.v1/t51

    Per-trigger yield versus $\Delta\phi$ for successively increasing trigger and partner $p_T$ ($p^a_T \otimes p^b_T$) in 0-20 % Au + Au...

  • Figure 36, p + p

    10.17182/hepdata.96764.v1/t52

    Per-trigger yield versus $\Delta\phi$ for successively increasing trigger and partner $p_T$ ($p^a_T \otimes p^b_T$) in p + p collisions.

  • Figure 37, Au + Au

    10.17182/hepdata.96764.v1/t53

    Per-trigger yield versus $\Delta\phi$ for successively increasing trigger and partner $p_T$ ($p^a_T \otimes p^b_T$) in 20-40 % Au + Au...

  • Figure 37, p + p

    10.17182/hepdata.96764.v1/t54

    Per-trigger yield versus $\Delta\phi$ for successively increasing trigger and partner $p_T$ ($p^a_T \otimes p^b_T$) in p + p collisions.

  • Figure 38, Au + Au

    10.17182/hepdata.96764.v1/t55

    Per-trigger yield versus $\Delta\phi$ for successively increasing trigger and partner $p_T$ ($p^a_T \otimes p^b_T$) in 60-92 % Au + Au...

  • Figure 38, p + p

    10.17182/hepdata.96764.v1/t56

    Per-trigger yield versus $\Delta\phi$ for successively increasing trigger and partner $p_T$ ($p^a_T \otimes p^b_T$) in p + p collisions.

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