Observation of the <i>W</i>-annihilation decay <i>D<sub>s</sub></i><SUP>+</SUP> → ωπ<SUP>+</SUP> and evidence for <i>D<sub>s</sub></i><SUP>+</SUP> → ω<i>K</i><SUP>+</SUP>


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

PHYSICAL REVIEW D, vol.99, no.9, 2019 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 99 Issue: 9
  • Publication Date: 2019
  • Doi Number: 10.1103/physrevd.99.091101
  • Journal Name: PHYSICAL REVIEW D
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Bursa Uludag University Affiliated: No

Abstract

We report the observation of W-annihilation decay D-s(+) -> omega pi(+) and evidence for D-s(+) -> omega K+ in a data sample corresponding to an integrated luminosity of 3.19 fb(-1) collected with the BESIII detector at a center-of-mass energy root s = 4.178 GeV. We obtain the branching fractions B(D-s(+) -> omega pi(+)) = (1.77 +/- 0.32(stat) +/- 0.13(sys)) x 10(-3) with a significance of 6.7 sigma and B(D-s(+) -> omega K+) = (0.87 +/- 0.24(stat) +/- 0.08(sys)) x 10(-3) with a significance of 4.4 sigma. This measurement provides critical information to determine the nonperturbative W-annihilation amplitudes and shows the potential of searching for CP asymmetry in D-s(+) -> omega K+.