Possible explanation of the irregular energy dependence of the rapidity width of $\phi$ mesons observed in Pb+Pb collisions
| Autor: | Reichert, Tom, Steinheimer, Jan, Bleicher, Marcus |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Experimental data from the NA49 collaboration show an unexpectedly steep rise of the rapidity width of the $\phi$ meson as function of beam energy, which was suggested as possible interesting signal for novel physics. In this work we show that the Ultra-relativistic Quantum-Molecular-Dynamics (UrQMD) model is able to reproduce the shapes of the rapidity distributions of most measured hadrons and predicts a common linear increase of the width for all hadrons. Only when following the exact same analysis technique and experimental acceptance of the NA49 and NA61/SHINE collaborations, we find that the extracted value of the rapidity width of the $\phi$ increases drastically for the highest beam energy. We conclude that the observed steep increase of the $\phi$ rapidity width is a problem of limited detector acceptance and the simplified Gaussian fit approximation. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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