Abstract

The charge-exchange reaction \({{\pi }^{ - }}p \to n\omega (783)\phi (1020)\), \(\omega \to {{\pi }^{ + }}{{\pi }^{ - }}{{\pi }^{0}}\), \(\phi \to {{K}^{ + }}{{K}^{ - }}\) is studied on the upgraded VES facility (U-70, Protvino) upon the interaction of a 29 GeV/c meson beam with a beryllium target. There are 905 events of the \(\omega \phi \) system selected. The distribution over the invariant mass of the \(\omega \phi \) system, \({{M}_{{\omega \phi }}}\), shows a near-threshold signal with a mass of M ~ 1.9 GeV/c². A five-particle partial wave analysis (PWA) reveals that the scalar state (\({{J}^{{PC}}} = {{0}^{{ + + }}}\)) dominates in this mass region. Under the assumption of the resonant nature of the signal, the following values of its mass and width are obtained: M = 1819 ± 27 MeV/c² and Γ = 167 ± 18 MeV/c².

中文翻译：

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在动量为29 GeV / c的介子-核相互作用中的ωϕ系统中寻找标量共振。

摘要

电荷交换反应\（{{\ pi} ^ {-}} p \至n \ omega（783）\ phi（1020）\），\（\ omega \至{{\ pi} ^ {+}} {{\ pi} ^ {-}} {{\ pi} ^ {0}} \），\（\ phi \ to {{K} ^ {+}} {{K} ^ {-}} \）是在29 GeV / c介子束与铍靶相互作用的条件下，对升级后的VES设施（U-70，Protvino）进行了研究。选择了\（\ omega \ phi \）系统有905个事件。过的不变质量分布\（\欧米加\披\）系统，\（{{M} _ {{\欧米加\披}}} \） ，示出了具有的质量接近阈值信号中号〜1.9 GeV / c ²。五粒子偏波分析（PWA）揭示了标量状态（\（{{J} ^ {{PC}}} = {{0} ^ {{+ +}}} \））在该质量区域中占主导地位。在信号谐振特性的假设下，获得以下质量和宽度值：M = 1819±27 MeV / c ²，Γ= 167±18 MeV / c ²。