Szczegóły publikacji
Opis bibliograficzny
Observation of the rare decay of the $\eta$ meson to four muons / A. Hayrapetyan, [et al.], V. AVATI, L. GRZANKA, M. MALAWSKI, [et al.] // Physical Review Letters ; ISSN 0031-9007 . — 2023 — vol. 131 iss. 9 art. no. 091903, s. 091903-1–091903-19. — Bibliogr. s. 091903-6, Abstr. — Publikacja dostępna online od: 2023-09-01
Autorzy (2350)
- AGHAvati Valentina
- AGHGrzanka Leszek
- AGHMalawski Maciej
- Hayrapetyan Aram
Dane bibliometryczne
| ID BaDAP | 149299 |
|---|---|
| Data dodania do BaDAP | 2023-10-16 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevLett.131.091903 |
| Rok publikacji | 2023 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp | |
| Creative Commons | |
| Czasopismo/seria | Physical Review Letters |
Abstract
A search for the rare η→μ+μ−μ+μ− double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of 101 fb−1. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the η→μ+μ− decay as normalization, the branching fraction B(η→μ+μ−μ+μ−)=[5.0±0.8(stat)±0.7(syst)±0.7(B2μ)]×10−9 is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions.