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Υ production in U + U collisions at sNN=193 GeV measured with the STAR experiment
- Adamczyk, L;
- Adkins, JK;
- Agakishiev, G;
- Aggarwal, MM;
- Ahammed, Z;
- Alekseev, I;
- Anderson, DM;
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- Campbell, JM;
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- Nasim;
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- Vasiliev, AN;
- Vertesi, R;
- Videbæk, F;
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- Voloshin, SA;
- Vossen, A;
- Wang, G;
- Wang, JS;
- Wang, F;
- Wang, Y;
- Wang, Y;
- Webb, JC;
- Webb, G;
- Wen, L;
- Westfall, GD;
- Wieman, H;
- Wissink, SW;
- Witt, R;
- Wu, Y;
- Xiao, ZG;
- Xie, G;
- Xie, W;
- Xin, K;
- Xu, Z;
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- Yang, Y;
- Yang, Y;
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- Yang, Q;
- Yang, Y;
- Yang, C;
- Ye, Z;
- Ye, Z;
- Yi, L;
- Yip, K;
- Yoo, I-K;
- Yu, N;
- Zbroszczyk, H;
- Zha, W;
- Zhang, J;
- Zhang, Z;
- Zhang, J;
- Zhang, S;
- Zhang, XP;
- Zhang, JB;
- Zhang, Y;
- Zhang, S;
- Zhao, J;
- Zhong, C;
- Zhou, L;
- Zhu, X;
- Zoulkarneeva, Y;
- Zyzak, M
Published Web Location
https://doi.org/10.1103/physrevc.94.064904Abstract
We present a measurement of the inclusive production of Υ mesons in U+U collisions at sNN=193 GeV at midrapidity (|y|<1). Previous studies in central Au+Au collisions at sNN=200 GeV show a suppression of Υ(1S+2S+3S) production relative to expectations from the Υ yield in p+p collisions scaled by the number of binary nucleon-nucleon collisions (Ncoll), with an indication that the Υ(1S) state is also suppressed. The present measurement extends the number of participant nucleons in the collision (Npart) by 20% compared to Au+Au collisions, and allows us to study a system with higher energy density. We observe a suppression in both the Υ(1S+2S+3S) and Υ(1S) yields in central U+U data, which consolidates and extends the previously observed suppression trend in Au+Au collisions.
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