期刊
PHYSICS LETTERS B
卷 742, 期 -, 页码 1-6出版社
ELSEVIER
DOI: 10.1016/j.physletb.2015.01.011
关键词
e(+)e(-) collisions; Conversion decay; Transition form factor
资金
- EU [RII3-CT-2004-506078]
- European Commission [227431]
- Polish National Science Centre [DEC-2011/03/N/ST2/02641, 2011/01/D/ST2/00748, 2011/03/N/ST2/02652, 2013/08/M/ST2/00323]
- Foundation For Polish Science through the MPD programme [HOMING PLUS BIS/2011-4/3]
We have studied the vector to pseudoscalar conversion decay phi -> eta e(+)e(-), with.. eta -> pi(0)pi(0)pi(0), with the KLOE detector at DA phi NE. The data set of 1.7 fb(-1) of e(+)e(-) collisions at root s similar to M-phi contains a clear conversion decay signal of similar to 31,000 events from which we measured a value of BR(phi -> eta e(+)e-) = (1.075 +/- 0.007 +/- 0.038) x 10(-4). The same sample is used to determine the transition form factor by a fit to the e(+)e(-) invariant mass spectrum, obtaining b(phi eta)=( 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. (C) 2015 The Authors. Published by Elsevier B.V.
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