Looking for new strategies to probe low mass axion-like particles in ultraperipheral heavy-ion collisions at the LHC
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| Format: | Preprint |
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2025
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| _version_ | 1866915119564324864 |
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| author | Nogarolli, Pedro Gonçalves, Victor P. Rangel, Murilo S. |
| author_facet | Nogarolli, Pedro Gonçalves, Victor P. Rangel, Murilo S. |
| contents | The possibility of searching for long-lived axion-like particles (ALPs) decaying into photons is investigated in ultraperipheral $PbPb$ collisions at the Large Hadron Collider (LHC). We propose a search strategy for low mass ALPs using the LHCb and ALICE experiments. The ALP identification is performed by requiring the decay vertex be reconstructed outside the region where a primary vertex is expected, which strongly suppress the contribution associated with the decay of light mesons. We also use the fact that a fraction of the photons convert into electron-positron pairs, allowing the reconstruction of the particle decay position. We present the predictions for the pseudo - rapidity and transverse momentum distributions of the ALPs and photons. Moreover, predictions for the fiducial cross-sections, derived considering the characteristics of the ALICE and LHCb detectors, are presented for different values of the ALP mass and the ALP - photon coupling. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_14041 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Looking for new strategies to probe low mass axion-like particles in ultraperipheral heavy-ion collisions at the LHC Nogarolli, Pedro Gonçalves, Victor P. Rangel, Murilo S. High Energy Physics - Phenomenology High Energy Physics - Experiment The possibility of searching for long-lived axion-like particles (ALPs) decaying into photons is investigated in ultraperipheral $PbPb$ collisions at the Large Hadron Collider (LHC). We propose a search strategy for low mass ALPs using the LHCb and ALICE experiments. The ALP identification is performed by requiring the decay vertex be reconstructed outside the region where a primary vertex is expected, which strongly suppress the contribution associated with the decay of light mesons. We also use the fact that a fraction of the photons convert into electron-positron pairs, allowing the reconstruction of the particle decay position. We present the predictions for the pseudo - rapidity and transverse momentum distributions of the ALPs and photons. Moreover, predictions for the fiducial cross-sections, derived considering the characteristics of the ALICE and LHCb detectors, are presented for different values of the ALP mass and the ALP - photon coupling. |
| title | Looking for new strategies to probe low mass axion-like particles in ultraperipheral heavy-ion collisions at the LHC |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2501.14041 |