We have measured the cross section sigma(e(+)e(-) -> pi(+)pi(-)gamma(gamma)) at DA Phi NE, the Frascati phi-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 < M(pi pi) < 0.975 GeV. For the latter we find Delta(pi pi)a(mu) = (387.2 +/- 0.5(stat) +/- 2.4(exp) +/- 2.3(th)) x 10(-10). (C) 2008 Elsevier B.V. All rights reserved.

Ambrosino, F., Antonelli, A., Antonelli, M., Archilli, F., Bacci, C., Beltrame, P., et al. (2009). Measurement of sigma(e(+)e(-) -> pi(+)pi(-)gamma(gamma)) and the dipion contribution to the muon anomaly with the KLOE detector. PHYSICS LETTERS. SECTION B, 670(4-5), 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

CERADINI, Filippo;DI MICCO, Biagio;
2009-01-01

Abstract

We have measured the cross section sigma(e(+)e(-) -> pi(+)pi(-)gamma(gamma)) at DA Phi NE, the Frascati phi-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 < M(pi pi) < 0.975 GeV. For the latter we find Delta(pi pi)a(mu) = (387.2 +/- 0.5(stat) +/- 2.4(exp) +/- 2.3(th)) x 10(-10). (C) 2008 Elsevier B.V. All rights reserved.
2009
Ambrosino, F., Antonelli, A., Antonelli, M., Archilli, F., Bacci, C., Beltrame, P., et al. (2009). Measurement of sigma(e(+)e(-) -> pi(+)pi(-)gamma(gamma)) and the dipion contribution to the muon anomaly with the KLOE detector. PHYSICS LETTERS. SECTION B, 670(4-5), 285-291 [10.1016/j.physletb.2008.10.060].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/121574
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