Observation of the Rare Decay of the η Meson to Four Muons
Autor
Hayrapetyan, A.
Tumasyan, A.
Adam, W.
Andrejkovic, J. W.
Bergauer, T.
Chatterjee, S.
Damanakis, K.
Dragicevic, M.
Del Valle, A. Escalante
Hussain, P. S.
Jeitler, M.
Krammer, N.
Kveton, Antonin
Datum vydání
2023Publikováno v
Physical Review LettersRočník / Číslo vydání
131 (9)ISBN / ISSN
ISSN: 0031-9007Metadata
Zobrazit celý záznamKolekce
Tato publikace má vydavatelskou verzi s DOI 10.1103/PhysRevLett.131.091903
Abstrakt
A search for the rare eta -> mu(+)mu(-)mu(+)mu(-) 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 eta -> mu(+)mu(-) decay as normalization, the branching fraction B(eta -> mu(+)mu(-)mu(+)mu(-)) = [5.0 +/- 0.8(stat) +/- 0.7(syst) +/- 0.7(B-2 mu)] x 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.
Klíčová slova
CMS, Rare Decay Meson, Four Muons
Trvalý odkaz
https://hdl.handle.net/20.500.14178/2320Licence
Licence pro užití plného textu výsledku: Creative Commons Uveďte původ 4.0 International