We study the process e + e − → π + π − η γ , where the photon is radiated from the initial state. About 8000 fully reconstructed events of this process are selected from the BABAR data sample with an integrated luminosity of 469     fb − 1 . Using the π + π − η invariant mass spectrum, we measure the e + e − → π + π − η cross section in the e + e − center-of-mass energy range from 1.15 to 3.5 GeV. The cross section is well described by the Vector-Meson dominance model with four ρ -like states. We observe 49 ± 9 events of the J / ψ decay to π + π − η and measure the product Γ J / Ψ → e + e − B J / Ψ → π + π − η = 2.34 ± 0.4 3 stat ± 0.1 6 syst     eV .

Study of the process e + e − → π + π − η using initial state radiation

Ferroni, F.;
2018

Abstract

We study the process e + e − → π + π − η γ , where the photon is radiated from the initial state. About 8000 fully reconstructed events of this process are selected from the BABAR data sample with an integrated luminosity of 469     fb − 1 . Using the π + π − η invariant mass spectrum, we measure the e + e − → π + π − η cross section in the e + e − center-of-mass energy range from 1.15 to 3.5 GeV. The cross section is well described by the Vector-Meson dominance model with four ρ -like states. We observe 49 ± 9 events of the J / ψ decay to π + π − η and measure the product Γ J / Ψ → e + e − B J / Ψ → π + π − η = 2.34 ± 0.4 3 stat ± 0.1 6 syst     eV .
Physics and Astronomy (miscellaneous)
File in questo prodotto:
File Dimensione Formato  
2018_PhysRevD_97_Ferroni.pdf

non disponibili

Tipologia: Altro materiale allegato
Licenza: Accesso gratuito
Dimensione 674.8 kB
Formato Adobe PDF
674.8 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

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: http://hdl.handle.net/20.500.12571/1880
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 17
social impact