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首页> 外文期刊>Physics of particles and nuclei letters >Search for and study of low-mass scalar mesons in reaction np → npπ ~+π ~- at neutron beam momentum P n = (5.20 +- 0.12) GeV/c
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Search for and study of low-mass scalar mesons in reaction np → npπ ~+π ~- at neutron beam momentum P n = (5.20 +- 0.12) GeV/c

机译：中子束动量P n =（5.20 +-0.12）GeV / c时反应np→npπ〜+π〜-的低质量标量子的搜索和研究

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摘要

We present the results of a search for and study of the resonance effects in the system of π ~+π ~- from the reaction np → npπ ~+π ~- at the momentum of quasi-monochromatic neutrons P _n = (5.20 ± 0.12) GeV/c from the data obtained in an exposure of the 1-m hydrogen bubble chamber of Veksler and Baldin Laboratory of High Energies, Joint Institute for Nuclear Research (VBLHE JINR). After the supplementary selection of the events where a secondary proton was emitted in the forward hemisphere in the general c. m. s. of the reaction (cosθ* _p>0) in the effective mass spectrum of π ~+π ~- combinations, we found nine peculiarities at the masses (350 ± 3), (408 ± 3), (489 ± 3), (579 ± 5), (676 ± 7), (762 ± 11), (878 ± 7), (1036 ±13), and (1170 ± 11) MeV/c ~2 with experimental widths of no more than several tens of MeV/c ~2. We carried out a direct measurement of the spins of resonances and also obtained other quantum numbers. All of these peculiarities have a similar set of quantum numbers I ~G(J ~(PC)) = 0 ~+ (0 ~(++)). We investigated a sequence of scalar-isoscalar resonances f _0(σ _0) with masses in the range M ≤ 1200 MeV/c ~2. We found a phenomenological dependence of the resonance mass on its number. This dependence covered not only the resonances shown in this paper, but also those present in PDG tables with quantum numbers of f _0(σ _0) mesons.
机译：我们给出了在准单色中子的动量P _n =（5.20±0.12）下从反应np→npπ〜+π〜-的π〜+π〜-系统中共振效应的搜索和研究结果。 ）GeV / c是从联合核研究所（VBLHE JINR）的Veksler和Baldin高能实验室中的1 m氢气泡室的暴露中获得的数据得出的。在补充选择事件后，一般在前半球中会发射出一个次级质子。米s。在π〜+π〜-组合有效质谱中的反应（cosθ* _p> 0），我们在质量（350±3），（408±3），（489±3），（ 579±5），（676±7），（762±11），（878±7），（1036±13）和（1170±11）MeV / c〜2，实验宽度不超过几十倍MeV / c〜2。我们对共振的自旋进行了直接测量，还获得了其他量子数。所有这些特性都有一组相似的量子数I〜G（J〜（PC））= 0〜+（0〜（++））。我们研究了质量在M≤1200 MeV / c〜2范围内的一系列标量-等量标量共振f_0（σ_0）。我们发现共振质量对其数量的现象学依赖性。这种依赖性不仅涵盖了本文显示的共振，而且还涵盖了量子数为f _0（σ_0）介子的PDG表中的共振。

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