Dijet imbalance measurements in $Au+Au$ and $pp$ collisions at $\sqrt{s_{NN}} = 200$ GeV at STAR

The STAR collaboration
Phys.Rev.Lett. 119 (2017) 062301, 2017.

Abstract
We report the first di-jet transverse momentum asymmetry measurements from Au+Au and p+p collisions at RHIC. The two highest-energy back-to-back jets reconstructed from fragments with transverse momenta above 2 GeV/c display a significantly stronger momentum imbalance in heavy-ion collisions than in the p+p reference. When re-examined with correlated soft particles included, we observe that these di-jets then exhibit a unique new feature -- momentum balance is restored to that observed in p+p for a jet resolution parameter of R=0.4, while re-balancing is not attained with a smaller value of R=0.2.

  • Table 1

    Figure 1

    10.17182/hepdata.102941.v1/t1

    Normalized AJ distributions for Au+Au HT data (filled symbols) and p+p HT $\oplus$ Au+Au MB (open symbols). The red circles...

  • Table 2

    Supplement to Figure 1.

    10.17182/hepdata.102941.v1/t2

    $p_{T}^{Part}$ vs. $p_{T}^{Det}$ for Leading jets with $R = 0.4$.

  • Table 3

    Supplement to Figure 1.

    10.17182/hepdata.102941.v1/t3

    $p_{T}^{Part}$ vs. $p_{T}^{Det}$ for Leading jets with $R = 0.2$.

  • Table 4

    Supplement to Figure 1.

    10.17182/hepdata.102941.v1/t4

    $p_{T}^{Part}$ vs. $p_{T}^{Det}$ for SubLeading jets with $R = 0.4$.

  • Table 5

    Supplement to Figure 1.

    10.17182/hepdata.102941.v1/t5

    $p_{T}^{Part}$ vs. $p_{T}^{Det}$ for SubLeading jets with $R = 0.2$.

  • Table 6

    Figure 2

    10.17182/hepdata.102941.v1/t6

    $A_{J}$ distributions for Au+Au data (filled symbols) and p+p HT $\oplus$ Au+Au MB (open symbols) for low constituent $p_{T}^{Cut}$ di-jets...

  • Table 7

    Supplement to Figure 2.

    10.17182/hepdata.102941.v1/t7

    $dN/d\delta p_{T}$ vs. $\delta p_{T}$ for $p_{T}^{Cut} > 2$ GeV/$c$ jets with $R = 0.4$.

  • Table 8

    Supplement to Figure 2.

    10.17182/hepdata.102941.v1/t8

    $dN/d\delta p_{T}$ vs. $\delta p_{T}$ for $p_{T}^{Cut} > 0.2$ GeV/$c$ matched jets with $R = 0.4$.

  • Table 9

    Supplement to Figure 2.

    10.17182/hepdata.102941.v1/t9

    $dN/d\delta p_{T}$ vs. $\delta p_{T}$ for $p_{T}^{Cut} > 2$ GeV/$c$ jets with $R = 0.2$.

  • Table 10

    Supplement to Figure 2.

    10.17182/hepdata.102941.v1/t10

    $dN/d\delta p_{T}$ vs. $\delta p_{T}$ for $p_{T}^{Cut} > 0.2$ GeV/$c$ matched jets with $R = 0.2$.

  • Table 11

    Figure 3.

    10.17182/hepdata.102941.v1/t11

    Repetition of the analysis shown in Fig. 1 with a smaller resolution parameter $R = 0.2$. Normalized $A_{J}$ distributions for...

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