Study of the Dalitz decay $\phi \to \eta e^+e^-$ with the KLOE detector - INSPIRE

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Study of the Dalitz decay $\phi \to \eta e^+e^-$ with the KLOE detector

KLOE-2

Collaboration

•

D. Babusci
(
- Frascati
)

Sep 16, 2014

6 pages

Published in:

Phys.Lett.B 742 (2015) 1-6

Published: Mar 6, 2015

e-Print:

1409.4582 [hep-ex]

DOI:

10.1016/j.physletb.2015.01.011

PDG:

{{\mathit \phi}{(1020)}}

\rightarrow

{{\mathit \eta}}{{\mathit e}^{+}}{{\mathit e}^{-}}

Experiments:

FRASCATI-DAFNE-KLOE-2

View in:

ADS Abstract Service

reference search44 citations

Citations per year

Abstract: (Elsevier)

We have studied the vector to pseudoscalar conversion decay ϕ→ηe+e− , with η→π0π0π0 , with the KLOE detector at DA Φ NE. The data set of 1.7 fb−1 of e+e− collisions at s∼Mϕ contains a clear conversion decay signal of ∼31,000 events from which we measured a value of BR(ϕ→ηe+e−)=(1.075±0.007±0.038)×10−4 . The same sample is used to determine the transition form factor by a fit to the e+e− invariant mass spectrum, obtaining bϕη=(1.28±0.10−0.08+0.09) GeV−2 , that improves by a factor of five the precision of the previous measurement and is in good agreement with VMD expectations.

Note:

13 pages, 6 figures, submitted to PLB

13.66.Bc
13.40.Gp
e+e− collisions
Conversion decay
Transition form factor
[formula omitted] collisions
form factor: transition
electron positron: annihilation
KLOE
Frascati Stor

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Figures(10)

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