Amplitude Analysis of Ds+→π+π0η and First Observation of the W-Annihilation Dominant Decays Ds+→a0(980)+π0 and Ds+→a0(980)0π

We present the first amplitude analysis of the decay Ds+→π+π0η. We use an e+e− collision data sample corresponding to an integrated luminosity of 3.19 fb−1 collected with the BESIII detector at a center-of-mass energy of 4.178 GeV. We observe for the first time the W-annihilation dominant decays Ds...

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Bibliographic Details
Published in:	Physical review letters 2019-09, Vol.123 (11), p.1
Main Author:	Ablikim, M
Format:	Article
Language:	eng
Subjects:	Amplitudes Decay Luminosity Physics
Online Access:	Get full text
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Summary:	We present the first amplitude analysis of the decay Ds+→π+π0η. We use an e+e− collision data sample corresponding to an integrated luminosity of 3.19 fb−1 collected with the BESIII detector at a center-of-mass energy of 4.178 GeV. We observe for the first time the W-annihilation dominant decays Ds+→a0(980)+π0 and Ds+→a0(980)0π+. We measure the absolute branching fraction B(Ds+→a0(980)+(0)π0(+),a0(980)+(0)→π+(0)η)=(1.46±0.15stat±0.23sys)%, which is larger than the branching fractions of other measured pure W-annihilation decays by at least one order of magnitude. In addition, we measure the branching fraction of Ds+→π+π0η with significantly improved precision.
ISSN:	0031-9007 1079-7114