The role of strangeness in baryon and electric charge stoppings
Abstract
Recently it has been proposed that comparing the net-baryon (B) stopping with net-electric charge (Q) stopping can help studies of the baryon stopping mechanism in nuclear collisions. Here we find the B/Q× Z/A ratio to be very sensitive to the difference between s and s̅ quark rapidity distributions. For mid-rapidity of isobar collisions at 200A GeV, a multi-phase transport (AMPT) model gives slightly more s̅ than s, which leads to B/Q× Z/A<1, while the model without the s−s̅ asymmetry gives B/Q× Z/A ≥ 1. Comparing Ru+Ru and Zr+Zr isobar collisions, the AMPT (and UrQMD) model gives B/ΔQ× ΔZ/A<1 at mid-rapidity at all centralities, which strongly contradicts the recent STAR data. We also find that the B/ΔQ× ΔZ/A ratio is very sensitive to the net-light quark (u,d) stoppings, but it is less sensitive to the s−s̅ asymmetry than the B/Q× Z/A ratio by a factor of 3. These results are expected to help us resolve the stopping puzzle and better understand the baryon stopping mechanism in the future.
Related
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BibTeX
@misc{lin2026role,
title = {{The role of strangeness in baryon and electric charge stoppings}},
author = {Zi-Wei Lin and Mason Alexander Ross},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.06834},
eprint = {2609.06834},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.06834},
}
RIS
TY - UNPB
TI - The role of strangeness in baryon and electric charge stoppings
AU - Zi-Wei Lin
AU - Mason Alexander Ross
PY - 2026
DA - 2026/09/06
PB - arXiv
DO - 10.48550/arxiv.2609.06834
UR - https://arxiv.org/abs/2609.06834
AB - Recently it has been proposed that comparing the net-baryon (B) stopping with net-electric charge (Q) stopping can help studies of the baryon stopping mechanism in nuclear collisions. Here we find the B/Q× Z/A ratio to be very sensitive to the difference between s and s̅ quark rapidity distributions. For mid-rapidity of isobar collisions at 200A GeV, a multi-phase transport (AMPT) model gives slightly more s̅ than s, which leads to B/Q× Z/A<1, while the model without the s−s̅ asymmetry gives B/Q× Z/A ≥ 1. Comparing Ru+Ru and Zr+Zr isobar collisions, the AMPT (and UrQMD) model gives B/ΔQ× ΔZ/A<1 at mid-rapidity at all centralities, which strongly contradicts the recent STAR data. We also find that the B/ΔQ× ΔZ/A ratio is very sensitive to the net-light quark (u,d) stoppings, but it is less sensitive to the s−s̅ asymmetry than the B/Q× Z/A ratio by a factor of 3. These results are expected to help us resolve the stopping puzzle and better understand the baryon stopping mechanism in the future.
ER -