ω → π⁺ π⁻ π⁰ 衰变达利兹图分布的测量
核实验
2017-05-03 v1
摘要
利用 pd → ³He ω 和 pp → ppω 的产生反应，基于 WASA 探测器在 COSY 上采集的 (4.408±0.042)×10⁴ 事例合并数据样本，研究了 ω → π⁺ π⁻ π⁰ 衰变的达利兹图分布。达利兹图密度由 P 波相空间与归一化极坐标达利兹图变量 Z 和 φ 的多项式展开的乘积参数化。首次以 4.1σ 的显著性观测到对纯 P 波相空间的偏离。该偏离由线性项 1+2αZ 参数化，α 测定为 +0.147±0.036，与 P 波 pion 对的 ρ 介子型末态相互作用的预期一致。
引用
@article{arxiv.1610.02187,
title = {Measurement of the $\omega \to \pi^+ \pi^- \pi^0$ Dalitz plot distribution},
author = {COSY Collaboration and P. Adlarson and W. Augustyniak and W. Bardan and M. Bashkanov and F. S. Bergmann and M. Berłowski and H. Bhatt and A. Bondar and M. Büscher and H. Calén and I. Ciepał and H. Clement and E. Czerwiński and K. Demmich and R. Engels and A. Erven and W. Erven and W. Eyrich and P. Fedorets and K. Föhl and K. Fransson and F. Goldenbaum and A. Goswami and K. Grigoryev and C. -O. Gullström and L. Heijkenskjöld and V. Hejny and N. Hüsken and L. Jarczyk and T. Johansson and B. Kamys and G. Kemmerling and F. A. Khan and G. Khatri and A. Khoukaz and O. Khreptak and D. A. Kirillov and S. Kistryn and H. Kleines and B. Kłos and W. Krzemień and P. Kulessa and A. Kupść and A. Kuzmin and K. Lalwani and D. Lersch and B. Lorentz and A. Magiera and R. Maier and P. Marciniewski and B. Mariański and H. -P. Morsch and P. Moskal and H. Ohm and E. Perez del Rio and N. M. Piskunov and D. Prasuhn and D. Pszczel and K. Pysz and A. Pyszniak and J. Ritman and A. Roy and Z. Rudy and O. Rundel and S. Sawant and S. Schadmand and I. Schätti-Ozerianska and T. Sefzick and V. Serdyuk and B. Shwartz and K. Sitterberg and T. Skorodko and M. Skurzok and J. Smyrski and V. Sopov and R. Stassen and J. Stepaniak and E. Stephan and G. Sterzenbach and H. Stockhorst and H. Ströher and A. Szczurek and A. Trzciński and R. Varma and M. Wolke and A. Wrońska and P. Wüstner and A. Yamamoto and J. Zabierowski and M. J. Zieliński and J. Złomańczuk and P. Żuprański and M. Żurek and B. Kubis and S. Leupold},
journal= {arXiv preprint arXiv:1610.02187},
year = {2017}
}
备注
8 pages, 7 figures