Search for a new 17 MeV resonance via $e^+e^-$ annihilation with the PADME Experiment

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Bibliographic Details
Main Authors:	Bossi, F., De Sangro, R., Di Giulio, C., Di Meco, E., Domenici, D., Finocchiaro, G., Foggetta, L. G., Garattini, M., Gianotti, P., Mancini, M., Sarra, I., Spadaro, T., Taruggi, C., Vilucchi, E., Dimitrova, K., Ivanov, S., Ivanov, Sv., Kostova, K., Kozhuharov, V., Simeonov, R., Ferrarotto, F., Leonardi, E., Valente, P., Long, E., Organtini, G. C., Raggi, M., Frankenthal, A.
Format:	Preprint
Published:	2025
Subjects:	High Energy Physics - Experiment
Online Access:	Acceder al recurso
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_version_	1866915812629020672
author	Bossi, F. De Sangro, R. Di Giulio, C. Di Meco, E. Domenici, D. Finocchiaro, G. Foggetta, L. G. Garattini, M. Gianotti, P. Mancini, M. Sarra, I. Spadaro, T. Taruggi, C. Vilucchi, E. Dimitrova, K. Ivanov, S. Ivanov, Sv. Kostova, K. Kozhuharov, V. Simeonov, R. Ferrarotto, F. Leonardi, E. Valente, P. Long, E. Organtini, G. C. Raggi, M. Frankenthal, A.
author_facet	Bossi, F. De Sangro, R. Di Giulio, C. Di Meco, E. Domenici, D. Finocchiaro, G. Foggetta, L. G. Garattini, M. Gianotti, P. Mancini, M. Sarra, I. Spadaro, T. Taruggi, C. Vilucchi, E. Dimitrova, K. Ivanov, S. Ivanov, Sv. Kostova, K. Kozhuharov, V. Simeonov, R. Ferrarotto, F. Leonardi, E. Valente, P. Long, E. Organtini, G. C. Raggi, M. Frankenthal, A.
contents	The PADME Experiment at the Frascati DA$Φ$NE LINAC has searched for a hypothetical particle with mass around 17 MeV, commonly referred to as the X17, using a positron beam incident on a fixed target. The beam energy was varied between 262 and 296 MeV, corresponding to center-of-mass energies $\sqrt{s}$ between 16.4 and 17.4 MeV. The X17 should be produced resonantly via $e^+e^-$ annihilation when $\sqrt{s}$ approaches its mass, inducing an excess of events with a two-body final state over the background expectation. The beam energy spacing was fixed to less than half the expected width of the resonance's line shape. Uncertainties below 1% per $\sqrt{s}$ point were achieved. A blind analysis has been performed. The data are consistent with the expected background in most of the explored energy range, and limits are set in previously unexplored regions of the available parameter space. The most significant deviation is found for $\sqrt{s} \approx 16.90$ MeV, corresponding to a global significance of approximately 2 standard deviations over the null hypothesis expectation.
format	Preprint
id	arxiv_https___arxiv_org_abs_2505_24797
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Search for a new 17 MeV resonance via $e^+e^-$ annihilation with the PADME Experiment Bossi, F. De Sangro, R. Di Giulio, C. Di Meco, E. Domenici, D. Finocchiaro, G. Foggetta, L. G. Garattini, M. Gianotti, P. Mancini, M. Sarra, I. Spadaro, T. Taruggi, C. Vilucchi, E. Dimitrova, K. Ivanov, S. Ivanov, Sv. Kostova, K. Kozhuharov, V. Simeonov, R. Ferrarotto, F. Leonardi, E. Valente, P. Long, E. Organtini, G. C. Raggi, M. Frankenthal, A. High Energy Physics - Experiment The PADME Experiment at the Frascati DA$Φ$NE LINAC has searched for a hypothetical particle with mass around 17 MeV, commonly referred to as the X17, using a positron beam incident on a fixed target. The beam energy was varied between 262 and 296 MeV, corresponding to center-of-mass energies $\sqrt{s}$ between 16.4 and 17.4 MeV. The X17 should be produced resonantly via $e^+e^-$ annihilation when $\sqrt{s}$ approaches its mass, inducing an excess of events with a two-body final state over the background expectation. The beam energy spacing was fixed to less than half the expected width of the resonance's line shape. Uncertainties below 1% per $\sqrt{s}$ point were achieved. A blind analysis has been performed. The data are consistent with the expected background in most of the explored energy range, and limits are set in previously unexplored regions of the available parameter space. The most significant deviation is found for $\sqrt{s} \approx 16.90$ MeV, corresponding to a global significance of approximately 2 standard deviations over the null hypothesis expectation.
title	Search for a new 17 MeV resonance via $e^+e^-$ annihilation with the PADME Experiment
topic	High Energy Physics - Experiment
url	https://arxiv.org/abs/2505.24797