A measurement of the vector to pseudoscalar conversion decay phi -> pi(0)e(+)e(-) with the KLOE experiment is presented. A sample of similar to 9500 signal events was selected from a data set of 1.7 fb(-1) of e(+)e(-) collisions at root s similar to m(phi) collected at the DA Phi NE e(+)e(-) collider. These events were used to perform the first measurement of the transition form factor vertical bar F(phi pi)0(q(2))vertical bar and a new measurement of the branching ratio of the decay: BR (phi -> pi(0)e(+)e(-)) = (1.35 +/- 0.05(-0.10)(+0.05)) x 10(-5). The result improves significantly on previous measurements and is in agreement with theoretical predictions. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).
Measurement of the phi -> pi(0)e(+)e(-) transition form factor with the KLOE detector
SCHIOPPA, Marco;
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 similar to 9500 signal events was selected from a data set of 1.7 fb(-1) of e(+)e(-) collisions at root s similar to m(phi) collected at the DA Phi NE e(+)e(-) collider. These events were used to perform the first measurement of the transition form factor vertical bar F(phi pi)0(q(2))vertical bar and a new measurement of the branching ratio of the decay: BR (phi -> pi(0)e(+)e(-)) = (1.35 +/- 0.05(-0.10)(+0.05)) x 10(-5). The result improves significantly on previous measurements and is in agreement with theoretical predictions. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
