A measurement of the vector to pseudoscalar conversion decay φ→π0e+e- with the KLOE experiment is presented. A sample of ~9500 signal events was selected from a data set of 1.7 fb-1 of e+e- collisions at s~mφ collected at the DAΦNE e+e- collider. These events were used to perform the first measurement of the transition form factor |Fφπ0(q2)| and a new measurement of the branching ratio of the decay: BR(φ→π0e+e-)=(1.35±0.05-0.10+0.05)×10-5. The result improves significantly on previous measurements and is in agreement with theoretical predictions. © 2016 The Authors.
|Titolo:||Measurement of the φ→π0e+e- transition form factor with the KLOE detector|
|Data di pubblicazione:||2016|
|Appare nelle tipologie:||1.1 Articolo in rivista|