Artículos de revistas
psi ` to J/psi ratio measurements in PHENIX at RHIC
Fecha
2011Registro en:
INDIAN JOURNAL OF PHYSICS, v.85, n.1, p.27-32, 2011
0973-1458
10.1007/s12648-011-0013-y
Autor
DONADELLI, M.
PHENIX Collaboration
Institución
Resumen
The ratio of the psi` over the J psi production cross section in the dielectron channel has been measured in root s = 200 GeV p + p collisions with the PHENIX detector at RHIC. The analysis is based on fitting of the dielectron invariant mass spectra in the area around the J psi and psi` signals in order to extract a ratio psi` over J psi of 0.019 +/- 0.005 (stat) +/- 0.002 (sys) and a fractional feed-down contribution to J psi from psi` of 8.6 +/- 2.5%.