We study the Υ(3S,2S)→ηΥ(1S) and Υ(3S,2S)→π+π-Υ(1S) transitions with 122×106Υ(3S) and 100×106Υ(2S) mesons collected by the BABAR detector at the PEP-II asymmetric-energy e+e- collider. We measure B[Υ(2S)→ηΥ(1S)]=(2.39±0.31(stat.)±0.14(syst.))×10-4 and Γ[Υ(2S)→ηΥ(1S)]/Γ[Υ(2S)→π+π-Υ(1S)]=(1.35±0.17(stat.)±0.08(syst.))×10-3. We find no evidence for Υ(3S)→ηΥ(1S) and obtain B[Υ(3S)→ηΥ(1S)]<1.0×10-4 and Γ[Υ(3S)→ηΥ(1S)]/ Γ[Υ(3S)→π+π-Υ(1S)]<2.3×10-3 as upper limits at the 90% confidence level. We also provide improved measurements of the Υ(2S)-Υ(1S) and Υ(3S)-Υ(1S) mass differences, 562.170±0.007(stat.)±0.088(syst.)  MeV/c2 and 893.813±0.015(stat.)±0.107(syst.)  MeV/c2, respectively.

Study of Υ(3S,2S)→ηΥ(1S) and Υ(3S,2S)→π^{+}π^{-}Υ(1S) hadronic transitions

LANCERI, LIVIO;VITALE, LORENZO;
2011-01-01

Abstract

We study the Υ(3S,2S)→ηΥ(1S) and Υ(3S,2S)→π+π-Υ(1S) transitions with 122×106Υ(3S) and 100×106Υ(2S) mesons collected by the BABAR detector at the PEP-II asymmetric-energy e+e- collider. We measure B[Υ(2S)→ηΥ(1S)]=(2.39±0.31(stat.)±0.14(syst.))×10-4 and Γ[Υ(2S)→ηΥ(1S)]/Γ[Υ(2S)→π+π-Υ(1S)]=(1.35±0.17(stat.)±0.08(syst.))×10-3. We find no evidence for Υ(3S)→ηΥ(1S) and obtain B[Υ(3S)→ηΥ(1S)]<1.0×10-4 and Γ[Υ(3S)→ηΥ(1S)]/ Γ[Υ(3S)→π+π-Υ(1S)]<2.3×10-3 as upper limits at the 90% confidence level. We also provide improved measurements of the Υ(2S)-Υ(1S) and Υ(3S)-Υ(1S) mass differences, 562.170±0.007(stat.)±0.088(syst.)  MeV/c2 and 893.813±0.015(stat.)±0.107(syst.)  MeV/c2, respectively.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

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/11368/2567023
 Avviso

Registrazione in corso di verifica.
La registrazione di questo prodotto non è ancora stata validata in ArTS.

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 23
  • ???jsp.display-item.citation.isi??? 16
social impact