首页> 外文OA文献 >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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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

机译:反应的截面e [上标+] e [上标 - ]→K [上标+] K [上标 - ]π[上标+]π[上标 - ],K [上标+] K [上标 - ]π[上标使用初始状态辐射事件测量的0]π[上标0]和K [上标+] K [上标 - ] K [上标+] K [上标 - ]

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摘要

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.
机译:我们研究过程e [上标+] e [上标-]→K [上标+] K [上标-]π[上标+]π[上标-]γ,K [上标+] K [上标-]π[上标0]π[上标0]γ和K [上标+] K [上标-] K [上标+] K [上标-]γ,其中从初始状态辐射光子。从BABAR数据的454 fb [上标-1]中分别选择了约84 000、8000和4200个完全重建的事件。强子最终状态的不变质量定义了e [上标+] e [上标-]质量中心,因此K [上标+] K [上标-]π[上标+]π[上标-]可以将γ数据与e [上标+] e [上标-]→K [上标+] K [上标-]π[上标+]π[上标-]反应的直接测量进行比较。 e [上标+] e [上标-]→K [上标+] K [上标-]π[上标0]π[上标0]或e [上标+] e [上标-]→K没有直接测量[上标+] K [上标-] K [上标+] K [上标-]反应,我们基于两倍大的数据样本展示了先前结果的更新。研究这些事件的结构,我们发现了许多中间状态的贡献,并提取了它们的横截面。特别是,我们对e [上标+] e [上标-]→ϕ(1020)ππγ反应进行了更详细的研究,并确认ϕ(1020)f [下标0]中存在Y(2175)共振。 (980)和K [上标+] K [上标-] f [下标0](980)模式。在the区,我们观察到所有三个最终状态和几个中间状态的J /ψ以及某些模式下的ψ(2S),并测量了相应的支化比和电子宽度的乘积。

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