Amplitude analysis of Ds+ →π+π0η and first observation of the W-annihilation dominant decays Ds+ →a0 (980)+π0 and Ds+ →a0 (980)0π+


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Ablikim M., Achasov M., Ahmed S., Albrecht M., Alekseev M., Amoroso A., ...More

Physical Review Letters, vol.123, no.11, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 123 Issue: 11
  • Publication Date: 2019
  • Doi Number: 10.1103/physrevlett.123.112001
  • Journal Name: Physical Review Letters
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Ankara University Affiliated: No

Abstract

© 2019 authors. Published by the American Physical Society.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.