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Di-\pi^0 correlations in p+p, p+Al and p+Au collisions at \sqrt{s_NN} = 200 GeV at STAR
by Xiaoxuan Chu (for the STAR Collaboration)
Submission summary
| Authors (as registered SciPost users): | Xiaoxuan Chu |
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| Preprint Link: | scipost_202107_00083v1 (pdf) |
| Date accepted: | March 22, 2022 |
| Date submitted: | July 30, 2021, 12:29 a.m. |
| Submitted by: | Xiaoxuan Chu |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 28th Annual Workshop on Deep-Inelastic Scattering (DIS) and Related Subjects (DIS2021) |
| Ontological classification | |
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| Academic field: | Physics |
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| Approach: | Experimental |
Abstract
The STAR Collaboration reports measurements of back-to-back azimuthal correlations of di-$\pi^0$ produced at forward pseudorapidity ($2.6<\eta<4.0$) in $p+$$p$, $p+$$\mathrm{Al}$ and $p+$$\mathrm{Au}$ collisions at a center-of-mass energy per nucleon-nucleon pair of 200 GeV. A clear suppression of the correlated away-side yields is observed in $p+$$\mathrm{Au}$ and for the first time in $p+$$\mathrm{Al}$ collisions, compared with the $p$$+$$p$ data. The enhanced suppression found in $p+$$\mathrm{Au}$ with respect to $p+$$\mathrm{Al}$ collisions exhibits the saturation scale ($Q_s^2$) dependence on the mass number~~$A$. The observed suppression of back-to-back pairs as a function of event activity and transverse momentum points to non-linear gluon dynamics arising at high parton densities.
Published as SciPost Phys. Proc. 8, 043 (2022)