Possible explanation of the irregular energy dependence of the rapidity width of $ϕ$ mesons observed in Pb+Pb collisions
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866911875859480576 |
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| author | Reichert, Tom Steinheimer, Jan Bleicher, Marcus |
| author_facet | Reichert, Tom Steinheimer, Jan Bleicher, Marcus |
| contents | Experimental data from the NA49 collaboration show an unexpectedly steep rise of the rapidity width of the $ϕ$ 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 $ϕ$ increases drastically for the highest beam energy. We conclude that the observed steep increase of the $ϕ$ rapidity width is a problem of limited detector acceptance and the simplified Gaussian fit approximation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_08094 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Possible explanation of the irregular energy dependence of the rapidity width of $ϕ$ mesons observed in Pb+Pb collisions Reichert, Tom Steinheimer, Jan Bleicher, Marcus Nuclear Theory Nuclear Experiment Experimental data from the NA49 collaboration show an unexpectedly steep rise of the rapidity width of the $ϕ$ 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 $ϕ$ increases drastically for the highest beam energy. We conclude that the observed steep increase of the $ϕ$ rapidity width is a problem of limited detector acceptance and the simplified Gaussian fit approximation. |
| title | Possible explanation of the irregular energy dependence of the rapidity width of $ϕ$ mesons observed in Pb+Pb collisions |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2405.08094 |