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Dijet imbalance measurements in Au+Au and pp collisions at sqrt[s_{NN}]=200 GeV at STAR.
- Adamczyk, L;
- Adkins, JK;
- Agakishiev, G;
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- Wang, JS;
- Wang, G;
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- Webb, G;
- Webb, JC;
- Wen, L;
- Westfall, GD;
- Wieman, H;
- Wissink, SW;
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- Yip, K;
- Yoo, I-K;
- Yu, N;
- Zbroszczyk, H;
- Zha, W;
- Zhang, XP;
- Zhang, J;
- Zhang, J;
- Zhang, Z;
- Zhang, S;
- Zhang, JB;
- Zhang, Y;
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- Zhao, J;
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- Zhu, X;
- Zoulkarneeva, Y;
- Zyzak, M;
- STAR Collaboration
- et al.
Published Web Location
https://doi.org/10.1103/physrevlett.119.062301Abstract
We report the first dijet transverse momentum asymmetry measurements from Au+Au and pp collisions at RHIC. The two highest-energy back-to-back jets reconstructed from fragments with transverse momenta above 2 GeV/c display a significantly higher momentum imbalance in heavy-ion collisions than in the pp reference. When reexamined with correlated soft particles included, we observe that these dijets then exhibit a unique new feature-momentum balance is restored to that observed in pp for a jet resolution parameter of R=0.4, while rebalancing is not attained with a smaller value of R=0.2.
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