A measurement of the vector to pseudoscalar conversion decay phi ->pi(0)e(+)e(-) with the KLOE experiment is presented. A sample of similarto 9500 signal events was selected from a data set of 1.7 fb(-1) ofe(+)e(-) collisions at root s similar to m(phi) collected at the DA PhiNE e(+)e(-) collider. These events were used to perform the firstmeasurement of the transition form factor vertical bar F(phipi)0(q(2))vertical bar and a new measurement of the branching ratio ofthe decay: BR (phi -> pi(0)e(+)e(-)) = (1.35 +/- 0.05(-0.10)(+0.05)) x10(-5). The result improves significantly on previous measurements andis in agreement with theoretical predictions. (C) 2016 The Authors.Published by Elsevier B.V. This is an open access article under the CCBY license (http://creativecommons.org/licenses/by/4.0/). Funded bySCOAP(3).
Measurement of the φ → π0e+e- transition form factor with the KLOE detector
Martini M.;
2016-01-01
Abstract
A measurement of the vector to pseudoscalar conversion decay phi ->pi(0)e(+)e(-) with the KLOE experiment is presented. A sample of similarto 9500 signal events was selected from a data set of 1.7 fb(-1) ofe(+)e(-) collisions at root s similar to m(phi) collected at the DA PhiNE e(+)e(-) collider. These events were used to perform the firstmeasurement of the transition form factor vertical bar F(phipi)0(q(2))vertical bar and a new measurement of the branching ratio ofthe decay: BR (phi -> pi(0)e(+)e(-)) = (1.35 +/- 0.05(-0.10)(+0.05)) x10(-5). The result improves significantly on previous measurements andis in agreement with theoretical predictions. (C) 2016 The Authors.Published by Elsevier B.V. This is an open access article under the CCBY license (http://creativecommons.org/licenses/by/4.0/). Funded bySCOAP(3).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
