Cross sections for the reactions e[superscript +]e[superscript -]→K[superscript +]K[superscript -]π[superscript +]π[superscript -], K[superscript +]K[superscript -]π[superscript 0]π[superscript 0], and K[superscript +]K[superscript -]K[superscript +]K[superscript -] measured using initial-state radiation events
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Lees-2012-Cross sections for the reactions.pdf
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Author(s)
Sciolla, Gabriella
Dujmic, Denis
Cowan, Ray F
Date Issued
July 2012
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. et al. “Cross sections for the reactions e[superscript +]e[superscript -]→K[superscript +]K[superscript -]π[superscript +]π[superscript -], K[superscript +]K[superscript -]π[superscript 0]π[superscript 0], and K[superscript +]K[superscript -]K[superscript +]K[superscript -] measured using initial-state radiation events.” Physical Review D 86.1 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
We study the processes e[superscript +]e[superscript -]→K[superscript +]K[superscript -]π[superscript +]π[superscript -]γ, K[superscript +]K[superscript -]π[superscript 0]π[superscript 0]γ, and K[superscript +]K[superscript -]K[superscript +]K[superscript -]γ, where the photon is radiated from the initial state. About 84 000, 8000, and 4200 fully reconstructed events, respectively, are selected from 454 fb[superscript -1] of BABAR data. The invariant mass of the hadronic final state defines the e[superscript +]e[superscript -] center-of-mass energy, so that the K[superscript +]K[superscript -]π[superscript +]π[superscript -]γ data can be compared with direct measurements of the e[superscript +]e[superscript -]→K[superscript +]K[superscript -]π[superscript +]π[superscript -] reaction. No direct measurements exist for the e[superscript +]e[superscript -]→K[superscript +]K[superscript -]π[superscript 0]π[superscript 0] or e[superscript +]e[superscript -]→K[superscript +]K[superscript -]K[superscript +]K[superscript -] reactions, and we present an update of our previous result based on a data sample that is twice as large. Studying the structure of these events, we find contributions from a number of intermediate states and extract their cross sections. In particular, we perform a more detailed study of the e[superscript +]e[superscript -]→ϕ(1020)ππγ reaction and confirm the presence of the Y(2175) resonance in the ϕ(1020)f[subscript 0](980) and K[superscript +]K[superscript -]f[subscript 0](980) modes. In the charmonium region, we observe the J/ψ in all three final states and in several intermediate states, as well as the ψ(2S) in some modes, and measure the corresponding products of branching fraction and electron width.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.86.012008
