| Abstract |
content_type = "text/plain"
user_agent = "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
moz = "Mozilla/5.0 "
moz_version = "5"
We study the processes e+e- -> K+K-pi+pi-gamma, K+K-pi0pi0gamma and
K+K-K+K-gamma, where the photon is radiated from the initial state.
About 34600, 4400 and 2300 fully reconstructed events, respectively,
are selected from 232 fb-1 of BaBar data. The invariant mass of the
hadronic final state defines the effective e+e- center-of-mass energy,
so that the K+K-pi+pi-\gamma data can be compared with direct
measurements of the e+e+ -> K+K-pi+pi- reaction; no direct
measurements exist for the e+e- -> K+K-pi0pi0 or e+e- -> K+K-K+K-
reactions. Studying the structure of these events, we find
contributions from a number of intermediate states, and we extract
their cross sections where possible. In particular, we isolate the
contribution from e+e+ -> phi(1020)f0(980) and study its structure
near threshold. In the charmonium region, we observe the J/psi in all
three final states and several intermediate states, as well as the
psi(2S) in some modes, and measure the corresponding branching fractions.
We see no signal for the Y(4260) and obtain an upper limit of
BF(Y(4260)->phi pi+pi-) x Gamma^Y_{ee} < 0.4 eV at 90\% C.L.
|
