Study of the reactions e+e- →π+π-π0π0π0 and π+π-π0π0η at center-of-mass energies from threshold to 4.35 GeV using initial-state radiation STUDY of the REACTIONS ⋯ J. P. LEES et al.

BABAR Collaboration

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28 Scopus citations

Abstract

We study the processes e+e-→π+π-π0π0π0γ and π+π-π0π0ηγ in which an energetic photon is radiated from the initial state. The data are collected with the BABAR detector at SLAC. About 14 000 and 4700 events, respectively, are selected from a data sample corresponding to an integrated luminosity of 469 fb-1. The invariant mass of the hadronic final state defines the effective e+e- center-of-mass energy. From the mass spectra, the first precise measurement of the e+e-→π+π-π0π0π0 cross section and the first measurement ever of the e+e-→π+π-π0π0η cross section are performed. The center-of-mass energies range from threshold to 4.35 GeV. The systematic uncertainty is typically between 10% and 13%. The contributions from ωπ0π0, ηπ+π-, and other intermediate states are presented. We observe the J/ψ and ψ(2S) in most of these final states and measure the corresponding branching fractions, many of them for the first time.

Original languageEnglish
Article number112015
JournalPhysical Review D
Volume98
Issue number11
DOIs
StatePublished - 1 Dec 2018

Funding

FundersFunder number
Stichting voor Fundamenteel Onderzoek der Materie
National Science Foundation
Institut National de Physique Nucléaire et de Physique des Particules
Instituto Nazionale di Fisica Nucleare
Norges Forskningsråd
Ministerio de Economía y Competitividad
Bundesministerium für Bildung und Forschung
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Deutsche Forschungsgemeinschaft
European Commission
U.S. Department of Energy
Marie Curie
Ministry of Education and Science of the Russian Federation
Natural Sciences and Engineering Research Council of Canada
Alfred P. Sloan Foundation
United States-Israel Binational Science FoundationU.S.-Israel
UK Research and Innovation53706
Science and Technology Facilities CouncilST/N000455/1, ST/N000420/1

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