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Title: | e+e− → K+K−π+π−, K+K−π0π0 and K+K−K+K− cross sections measured with initial-state radiation |
Author: | Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 31-Jul-2007 |
Publisher: | American Physical Society |
Abstract: | We study the processes e + e − → K + K − π + π − γ , K + K − π 0 π 0 γ and K + K − K + K − γ , where the photon is radiated from the initial state. About 34 600, 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 − π + π − γ data can be compared with direct measurements of the e + e − → K + K − π + π − reaction; no direct measurements exist for the e + e − → K + K − π 0 π 0 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 − → ϕ ( 1020 ) f 0 ( 980 ) and study its structure near threshold. In the charmonium region, we observe the J / ψ in all three final states and several intermediate states, as well as the ψ ( 2 S ) in some modes, and measure the corresponding branching fractions. We see no signal for the Y ( 4260 ) and obtain an upper limit of B Y ( 4260 ) → ϕ π + π − ⋅ Γ Y e e < 0.4 eV at 90% C.L. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.76.012008 |
It is part of: | Physical Review D, 2007, vol. 76, num. 1, p. 012008 |
URI: | http://hdl.handle.net/2445/131449 |
Related resource: | https://doi.org/10.1103/PhysRevD.76.012008 |
ISSN: | 1550-7998 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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558196.pdf | 2.23 MB | Adobe PDF | View/Open |
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