Direct measurement of the phi(1020) leptonic branching ratio
M. N. Achasov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, S. V. Burdin, T. V. Dimova, A. A. Drozdetsky, V. P. Druzhinin, M. S. Dubrovin, I. A. Gaponenko, V. B. Golubev, V. N. Ivanchenko, P. M. Ivanov, A. A. Korol, S. V. Koshuba, A. P. Lysenko, I. N. Nesterenko, E. V. Pakhtusova, E. A. Perevedentsev, A. A. Salnikov, S. I. Serednyakov, V. V. Shary, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, A. N. Skrinsky, Yu. V. Usov, A. V. Vasiljev
Abstract
The process e+e-->mu+mu- has been studied by SND detector at VEPP-2M e+e- collider in the phi(1020)-resonance energy region. The measured effective phi meson leptonic branching ratio: B(phi->l+l-)=sqrtB(phi->e+e-)*B(phi->mu+mu-)=(2.89+-0.10+-0.06)*10-4 agrees well with the PDG value B(phi->e+e-)=(2.91+-0.07)*10-4 confirming mu-e universality. Without additional assumption of mu-e universality the branching ratio B(phi->mu+mu-)=(2.87+-0.20+-0.14)*10-4 was obtained.
Create a lesson
Related papers
A machine-learning method for the estimation of the background from jets misidentified as hadronic tau lepton decays
CMS Collaboration
Recent results in b → s\, transitions at LHCb
Juan Jose Juan Castella
Determination of U-spin breaking parameters with an amplitude analysis of the decay D0 KS,L0π+π-
BESIII Collaboration, M. Ablikim, M. N. Achasov et al.
Observation of a Threshold Enhancement in the π0π0 Mass Spectrum in ψ(3686) → π0π0J/ψ Decays
BESIII Collaboration, M. Ablikim, M. N. Achasov et al.
HepUKE: Uncertainty-aware Knowledge Evolution for High Energy Physics Analysis Agents
Zijie Shang, Ke Li, Junkun Jiao et al.
A compact, interrogable Tree Tensor Network Jet Tagger on Lund declustering trees
Fabrizio Napolitano, Luca Della Penna, Tommaso Tedeschi et al.