We have measured the cross section σ(e+e− → pi+pi−>γ(γ)) at DAΦNE, the Frascati φ–factory, using events with initial state radiation photons emitted at small angle and inclusive of final state radiation. We present the analysis of a new data set corresponding to an integrated luminosity of 240 pb−1. We have achieved a reduced systematic uncertainty with respect to previously published KLOE results. From the cross section we obtain the pion form factor and the contribution to the muon magnetic anomaly from two-pion states in the mass range 0.592 < Mππ < 0.975 GeV. For the latter we find ∆pipiaμ=(387.2±0.5stat±2.4exp±2.3th)×10−10.

Measurement of sigma(e + e- ---> pi+ pi- gamma(gamma)) and the dipion contribution to the muon anomaly with the KLOE detector / Ambrosino, Fabio; Capussela, Tiziana; DI DONATO, Camilla; Massarotti, Paolo; Meola, Sabino; Napolitano, Marco; Saracino, Giulio; Perfetto, Francesco. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 670:4-5(2009), pp. 285-291. [10.1016/j.physletb.2008.10.060]

Measurement of sigma(e + e- ---> pi+ pi- gamma(gamma)) and the dipion contribution to the muon anomaly with the KLOE detector.

AMBROSINO, FABIO;CAPUSSELA, TIZIANA;DI DONATO, CAMILLA;MASSAROTTI, PAOLO;MEOLA, SABINO;NAPOLITANO, MARCO;SARACINO, GIULIO;PERFETTO, FRANCESCO
2009

Abstract

We have measured the cross section σ(e+e− → pi+pi−>γ(γ)) at DAΦNE, the Frascati φ–factory, using events with initial state radiation photons emitted at small angle and inclusive of final state radiation. We present the analysis of a new data set corresponding to an integrated luminosity of 240 pb−1. We have achieved a reduced systematic uncertainty with respect to previously published KLOE results. From the cross section we obtain the pion form factor and the contribution to the muon magnetic anomaly from two-pion states in the mass range 0.592 < Mππ < 0.975 GeV. For the latter we find ∆pipiaμ=(387.2±0.5stat±2.4exp±2.3th)×10−10.
2009
Measurement of sigma(e + e- ---&gt; pi+ pi- gamma(gamma)) and the dipion contribution to the muon anomaly with the KLOE detector / Ambrosino, Fabio; Capussela, Tiziana; DI DONATO, Camilla; Massarotti, Paolo; Meola, Sabino; Napolitano, Marco; Saracino, Giulio; Perfetto, Francesco. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 670:4-5(2009), pp. 285-291. [10.1016/j.physletb.2008.10.060]
File in questo prodotto:
File Dimensione Formato  
PhysicsLetterB670_2009.pdf

non disponibili

Tipologia: Documento in Post-print
Licenza: Accesso privato/ristretto
Dimensione 650.09 kB
Formato Adobe PDF
650.09 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: https://hdl.handle.net/11588/352518
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 208
  • ???jsp.display-item.citation.isi??? 169
social impact