F. Bossi
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
F. Bossi has a total of 87 co-authors. Here are the top co-authors by number of shared publications:
- Danilo Domenici
Istituto Nazionale di Fisica Nucleare Laboratori Nazionali di Frascati
4 shared publications - Andre Frankenthal
Princeton University
3 shared publications - Claudio Di Giulio
INFN Laboratori Nazionali di Frascati
3 shared publications - E. Long
INFN Sezione di Roma
3 shared publications - Elisa Di Meco
INFN Laboratori Nazionali di Frascati
3 shared publications - Elisabetta Vilucchi
INFN e Laboratori Nazionali di Frascati
3 shared publications
Latest Publications
- Open Access
- 15 January 2026
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2026 (1) , 91
Measurement of η → π0γγ branching fraction with the KLOE detector
A bstract: We present a measurement of the doubly radiative decay η → π 0 γγ based on a sample of 82 million η mesons produced in the e + e − → ϕ → ηγ process at the Frascati ϕ -factory DAΦNE. From the data analysis, 1246 ± 133 signal events were observed. By normalising the signal to the well-known η → 3 π 0 decay the branching fraction $$\mathcal{B}(\eta \to {\pi }^{0}\gamma \gamma )$$ is measured to be (0 . 98 ± 0 . 11 stat ± 0 . 14 syst ) × 10 − 4 . This result agrees with a preliminary KLOE measurement, but is a factor of two smaller than the current world average. Results for d Γ( η → π 0 γγ ) /dM 2 ( γγ ) are also presented and compared with the latest theoretical predictions.- 15 January 2026
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2026 (1) , 91
Open AccessMeasurement of η → π0γγ branching fraction with the KLOE detector
A bstract: We present a measurement of the doubly radiative decay η → π 0 γγ based on a sample of 82 million η mesons produced in the e + e − → ϕ → ηγ process at the Frascati ϕ -factory DAΦNE. From the data analysis, 1246 ± 133 signal events were observed. By normalising the signal to the well-known η → 3 π 0 decay the branching fraction $$\mathcal{B}(\eta \to {\pi }^{0}\gamma \gamma )$$ is measured to be (0 . 98 ± 0 . 11 stat ± 0 . 14 syst ) × 10 − 4 . This result agrees with a preliminary KLOE measurement, but is a factor of two smaller than the current world average. Results for d Γ( η → π 0 γγ ) /dM 2 ( γγ ) are also presented and compared with the latest theoretical predictions. - Top Cited PapersOpen Access
- 4 November 2025
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2025 (11) , 1-31
Search for a new 17 MeV resonance via e+e− annihilation with the PADME experiment
A bstract: The PADME Experiment at the Frascati DAΦNE linear accelerator 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.- 4 November 2025
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2025 (11) , 1-31
Top Cited PapersOpen AccessSearch for a new 17 MeV resonance via e+e− annihilation with the PADME experiment
A bstract: The PADME Experiment at the Frascati DAΦNE linear accelerator 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. - Open Access
- 4 June 2025
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2025 (6) , 1-16
Blind unblinding procedure for the PADME X17 data sample
The PADME experiment at the Frascati DAΦNE LINAC has performed a search for the hypothetical X17 particle, with a mass of around 17 MeV, by scanning the energy of a positron beam striking a fixed target. The X17 should be produced from the resulting e + e − annihilation. Since the expected mass of this particle is only roughly known, data sidebands cannot be clearly defined. Furthermore, the need to keep the analysis blind to potentially sizable signal contributions prevents a clear assessment even of the quality of the data sample in this search. In light of these challenges, this paper presents an innovative strategy adopted by the PADME Collaboration to perform data quality checks without disclosing the X17 sample. Moreover, the procedure designed to eventually unblind the data is described, together with the statistical approach adopted to extract the limits on the coupling between the X17 and the Standard Model.
- 4 June 2025
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2025 (6) , 1-16
Open AccessBlind unblinding procedure for the PADME X17 data sample
The PADME experiment at the Frascati DAΦNE LINAC has performed a search for the hypothetical X17 particle, with a mass of around 17 MeV, by scanning the energy of a positron beam striking a fixed target. The X17 should be produced from the resulting e + e − annihilation. Since the expected mass of this particle is only roughly known, data sidebands cannot be clearly defined. Furthermore, the need to keep the analysis blind to potentially sizable signal contributions prevents a clear assessment even of the quality of the data sample in this search. In light of these challenges, this paper presents an innovative strategy adopted by the PADME Collaboration to perform data quality checks without disclosing the X17 sample. Moreover, the procedure designed to eventually unblind the data is described, together with the statistical approach adopted to extract the limits on the coupling between the X17 and the Standard Model.
- Open Access
- 16 August 2024
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2024 (8) , 1-23
Characterization of the PADME positron beam for the X17 measurement
A bstract: This paper presents a detailed characterization of the positron beam delivered by the Beam Test Facility at Laboratori Nazionali of Frascati to the PADME experiment during Run III, which took place from October to December 2022. It showcases the methodology used to measure the main beam parameters such as the position in space, the absolute momentum scale, the beam energy spread, and its intensity through a combination of data analysis and Monte Carlo simulations. The results achieved include an absolute precision in the momentum of the beam to within ~1–2 MeV /c , a relative beam energy spread below 0.25%, and an absolute precision in the intensity of the beam at the level of 2%.
- 16 August 2024
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2024 (8) , 1-23
Open AccessCharacterization of the PADME positron beam for the X17 measurement
A bstract: This paper presents a detailed characterization of the positron beam delivered by the Beam Test Facility at Laboratori Nazionali of Frascati to the PADME experiment during Run III, which took place from October to December 2022. It showcases the methodology used to measure the main beam parameters such as the position in space, the absolute momentum scale, the beam energy spread, and its intensity through a combination of data analysis and Monte Carlo simulations. The results achieved include an absolute precision in the momentum of the beam to within ~1–2 MeV /c , a relative beam energy spread below 0.25%, and an absolute precision in the intensity of the beam at the level of 2%.