Measurement of η→π<sup>0</sup>γγ decay in KLOE experiment
ORAL
Abstract
The latest results from KLOE collaboration on five photon final state, which is used to study the η→π0γγ decay will be presented.
This process gives an unique way to test ChPT because of its sensitivity to the p^6 term on both the branching ratio and the M2(γγ) spectrum. Moreover
the shape of M2(γγ) distribution can help to either distinguish or provide the constrains for various theoretical models.
A previous preliminary KLOE measurement, based on 450 pb-1, provided a much lower BR value than the most accurate determination from Crystal Ball experiment.
A new analysis with a larger data sample (1.7 fb-1) is in progress to confirm this result. The preliminary value for BR and dΓ/dM2(γγ) partial decay width spectrum will
be presented.
This process gives an unique way to test ChPT because of its sensitivity to the p^6 term on both the branching ratio and the M2(γγ) spectrum. Moreover
the shape of M2(γγ) distribution can help to either distinguish or provide the constrains for various theoretical models.
A previous preliminary KLOE measurement, based on 450 pb-1, provided a much lower BR value than the most accurate determination from Crystal Ball experiment.
A new analysis with a larger data sample (1.7 fb-1) is in progress to confirm this result. The preliminary value for BR and dΓ/dM2(γγ) partial decay width spectrum will
be presented.
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Presenters
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Marcin Berlowski
National Centre for Nuclear Research
Authors
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Marcin Berlowski
National Centre for Nuclear Research