Baryonic resonances close to the $\bar{K}$ N threshold: The Case of $\Sigma(1385)^+$ in pp collisions

HADES collaboration (102 authors); Blanco, A.; Fonte, P.; Lopes, L.; Mangiarotti, A.

http://hdl.handle.net/10400.26/26046

Use this identifier to reference this record.

Name:	Description:	Size:	Format:
1.pdf		688.37 KB	Adobe PDF	Download

Send Feedback

Authors

HADES collaboration (102 authors)

Abstract(s)

We present results of an exclusive measurement of the first excited state of the Sigma hyperon, Sigma(1385)^+, produced in p+p -> Sigma^+ + K^+ + n at 3.5 GeV beam energy. The extracted data allow to study in detail the invariant mass distribution of the Sigma(1385)^+. The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at m_0 = 1383.2 +- 0.9 MeV/c^2 and a width of 40.2 +- 2.1 MeV/c^2. The exclusive production cross-section comes out to be 22.27 +- 0.89 +- 1.56 +3.07 -2.10 mu b. Angular distributions of the Sigma(1385)^+ in different reference frames are found to be compatible with the hypothesis that 33 % of Sigma(1385)^+ result from the decay of an intermediate Delta^{++} resonance.