Separating non-collective effects in d-Au collisions
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| Format: | Preprint |
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2025
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| _version_ | 1866908426281418752 |
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| author | Nayak, Satya Ranjan Das, Akash Singh, B. K. |
| author_facet | Nayak, Satya Ranjan Das, Akash Singh, B. K. |
| contents | In this letter, we present the multiplicity and yields of charged hadrons and particle ratios in d-Au collisions at $\sqrt{s_{NN}}= 200$ GeV using the PYTHIA8/Angantyr. The model reproduces the multiplicity ($N_{ch}$) and pseudo-rapidity distribution reasonably well in minimum-biased d-Au collisions without assuming the formation of a thermalized medium. The invariant yield from Angantyr underpredicts the data in central collisions. We discussed the similarity between the nuclear modification factor $R_{AA}$ and data/MC from Angantyr and the possibility of using it as an alternative to check in-medium effects. The data/MC suggests that the central d-Au collisions exhibit signals like baryon enhancement, but no high $p_T$ suppression was found. The d-Au collisions have a much smaller invariant yield than the thermal model calculation for similar $N_{part}$. Based on the available data and simulation results, we argue that a medium may form in the central d-Au collision, but it differs from the perfect QGP formed in Pb-Pb collisions at LHC. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_23019 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Separating non-collective effects in d-Au collisions Nayak, Satya Ranjan Das, Akash Singh, B. K. Nuclear Theory High Energy Physics - Phenomenology In this letter, we present the multiplicity and yields of charged hadrons and particle ratios in d-Au collisions at $\sqrt{s_{NN}}= 200$ GeV using the PYTHIA8/Angantyr. The model reproduces the multiplicity ($N_{ch}$) and pseudo-rapidity distribution reasonably well in minimum-biased d-Au collisions without assuming the formation of a thermalized medium. The invariant yield from Angantyr underpredicts the data in central collisions. We discussed the similarity between the nuclear modification factor $R_{AA}$ and data/MC from Angantyr and the possibility of using it as an alternative to check in-medium effects. The data/MC suggests that the central d-Au collisions exhibit signals like baryon enhancement, but no high $p_T$ suppression was found. The d-Au collisions have a much smaller invariant yield than the thermal model calculation for similar $N_{part}$. Based on the available data and simulation results, we argue that a medium may form in the central d-Au collision, but it differs from the perfect QGP formed in Pb-Pb collisions at LHC. |
| title | Separating non-collective effects in d-Au collisions |
| topic | Nuclear Theory High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2503.23019 |