تقرير
Observation of a narrow baryon resonance with positive strangeness formed in $K^+$Xe collisions
| العنوان: | Observation of a narrow baryon resonance with positive strangeness formed in $K^+$Xe collisions |
|---|---|
| المؤلفون: | DIANA Collaboration, Barmin, V. V., Asratyan, A. E., Borisov, V. S., Curceanu, C., Davidenko, G. V., Dolgolenko, A. G., Guaraldo, C., Kubantsev, M. A., Larin, I. F., Matveev, V. A., Shebanov, V. A., Shishov, N. N., Sokolov, L. I., Tarasov, V. V., Tumanov, G. K., Verebryusov, V. S. |
| المصدر: | Phys. Rev. C89, 045204 (2014) |
| سنة النشر: | 2013 |
| المجموعة: | High Energy Physics - Experiment Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment, High Energy Physics - Experiment |
| الوصف: | The charge-exchange reaction K^+ Xe --> K^0 p Xe' is investigated using the data of the DIANA experiment. The distribution of the pK^0 effective mass shows a prominent enhancement near 1538 MeV formed by \sim 80 events above the background, whose width is consistent with being entirely due to the experimental resolution. Under the selections based on a simulation of K^+Xe collisions, the statistical significance of the signal reaches 5.5\sigma. We interpret this observation as strong evidence for formation of a pentaquark baryon with positive strangeness, \Theta^+(uudd\bar{s}), in the charge-exchange reaction K^+ n --> K^0 p on a bound neutron. The mass of the \Theta^+ baryon is measured as m(\Theta^+) = 1538+-2 MeV. Using the ratio between the numbers of resonant and non-resonant charge-exchange events in the peak region, the intrinsic width of this baryon resonance is determined as \Gamma(\Theta^+) = 0.34+-0.10 MeV. Comment: 19 pages, 8 figures |
| نوع الوثيقة: | Working Paper |
| الوصول الحر: | http://arxiv.org/abs/1307.1653Test |
| رقم الانضمام: | edsarx.1307.1653 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |