Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 2666
Articles: 1'969'992
Articles rated: 2572

09 July 2020
 
  » arxiv » 1307.1653

  Article overview


Observation of a narrow baryon resonance with positive strangeness formed in $K^+$Xe collisions
DIANA Collaboration ; V.V. Barmin ; A.E. Asratyan ; V.S. Borisov ; C. Curceanu ; G.V. Davidenko ; A.G. Dolgolenko ; C. Guaraldo ; M.A. Kubantsev ; I.F. Larin ; V.A. Matveev ; V.A. Shebanov ; N.N. Shishov ; L.I. Sokolov ; V.V. Tarasov ; G.K. Tumanov ; V.S. Verebryusov ;
Date 5 Jul 2013
AbstractThe data on the charge-exchange reaction K^+ Xe --> K^0 p Xe’, obtained with the Xenon bubble chamber DIANA, are reanalyzed using increased statistics and modified selections. The distribution of the pK^0 effective mass shows a prominent enhancement near 1538 MeV whose width is consistent with being entirely due to experimental resolution. A corresponding enhancement at m(pK^0) simeq 1538 MeV and p(K^+)simeq 490 MeV is observed in the m(pK^0)--p(K^+) scatter plot. Using a simulation of K^+ Xe collisions that includes the development of the intranuclear cascade, we show that the observed enhancement is not a spurious structure created by the selections. The statistical significance of the signal, estimated as sqrt{2DeltalnL}, reaches 6.3 standard deviations. We interpret this observation as strong evidence for formation of a pentaquark baryon with positive strangeness, Theta^+(uuddar{s}), in the charge-exchange reaction K^+ p --> K^0 n on a bound neutron. The mass of the Theta^+ baryon is measured as m = 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 has been determined as Gamma(Theta^+) = 0.36+-0.11 MeV.
Source arXiv, 1307.1653
Services Forum | Review | PDF | Favorites   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.

browser CCBot/2.0 (https://commoncrawl.org/faq/)






ScienXe.org
» my Online CV
» Free


News, job offers and information for researchers and scientists:
home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2020 - Scimetrica