The KLOE experiment at the DA??????NE ??????-factory has performed a new precise measurement of the pion form factor using Initial State Radiation events, with photons emitted at small polar angle. Results based on an integrated luminosity of 240 pb-1 and extraction of the ???????????? contribution to a?????? in the mass range 0.35 < M ???????????? 2 < 0.95 GeV2 are presented. The new value of a?????? ???????????? has smaller (30%) statistical and systematic error and is consistent with the KLOE published value (confirming the current disagreement between the standard model prediction for a?????? and the measured value). ?????? 2009 American Institute of Physics.
A precise new KLOE measurement of |Fπ|2 with ISR events and determination of ππ contribution to aμ / Ambrosino, Fabio; Chiefari, Giovanni; Napolitano, Marco; Saracino, Giulio. - STAMPA. - 1182:(2009), pp. 665-669. (Intervento presentato al convegno CIPANP09 tenutosi a San Diego nel 05/2009) [10.1063/1.3293895].
A precise new KLOE measurement of |Fπ|2 with ISR events and determination of ππ contribution to aμ
AMBROSINO, FABIO;CHIEFARI, GIOVANNI;NAPOLITANO, MARCO;SARACINO, GIULIO
2009
Abstract
The KLOE experiment at the DA??????NE ??????-factory has performed a new precise measurement of the pion form factor using Initial State Radiation events, with photons emitted at small polar angle. Results based on an integrated luminosity of 240 pb-1 and extraction of the ???????????? contribution to a?????? in the mass range 0.35 < M ???????????? 2 < 0.95 GeV2 are presented. The new value of a?????? ???????????? has smaller (30%) statistical and systematic error and is consistent with the KLOE published value (confirming the current disagreement between the standard model prediction for a?????? and the measured value). ?????? 2009 American Institute of Physics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
