We have measured the ratio of prompt production rates of the charmonium states chi (c1) and chi (c2) in 110 pb(-1) of p (p) over bar collisions at roots = 1.8 TeV. The photon from their decay into J/Psi gamma is reconstructed through conversion into ece pairs. The energy resolution this technique provides makes the resolution of the two states possible. We find the ratio of production cross sections sigma chi (c1)/sigma chi (c1) = 0.96 +/- 0.27(stat) +/- 0.11(syst) for events with p(T)(J/Psi) > 4.0 GeV/c, /eta (J/Psi)/ < 0.6, and p(T)(gamma) > 1.0 GeV/c. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Nomerotski, Andrei/A-5169-2010; St.Denis, Richard/C-8997-2012; Prokoshin, Fedor/E-2795-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012

Production of chi(c1) and chi(c2) in p(p)over-bar collisions at root s=1.8 TeV

PIACENTINO, Giovanni Maria;
2001-01-01

Abstract

We have measured the ratio of prompt production rates of the charmonium states chi (c1) and chi (c2) in 110 pb(-1) of p (p) over bar collisions at roots = 1.8 TeV. The photon from their decay into J/Psi gamma is reconstructed through conversion into ece pairs. The energy resolution this technique provides makes the resolution of the two states possible. We find the ratio of production cross sections sigma chi (c1)/sigma chi (c1) = 0.96 +/- 0.27(stat) +/- 0.11(syst) for events with p(T)(J/Psi) > 4.0 GeV/c, /eta (J/Psi)/ < 0.6, and p(T)(gamma) > 1.0 GeV/c. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Nomerotski, Andrei/A-5169-2010; St.Denis, Richard/C-8997-2012; Prokoshin, Fedor/E-2795-2012; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11695/4797
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 30
  • ???jsp.display-item.citation.isi??? 26
social impact