期刊
EUROPEAN PHYSICAL JOURNAL C
卷 77, 期 9, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-017-5169-y
关键词
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资金
- Spanish Ministerio de Economia y Competitividad and European FEDER funds [FIS2014-57026-REDT, FIS2014-51948-C2-1-P, FIS2014-51948-C2-2-P]
- Generalitat Valenciana in the program Prometeo [II-2014/068]
The possible role of the triangle mechanism in the B- decay into D*(0)pi(-)pi(0)eta and D*(0)pi(-)pi(+)pi(-) is investigated. In this process, the triangle singularity appears from the decay of B- into D*K-0(-) K*(0) followed by the decay of K-*0 into pi(-) K+ and the fusion of the K+ K-, which forms the a(0)(980) or f(0)(980), which finally decay into pi(0)eta or pi(+)pi(-), respectively. The triangle mechanism from the (K) over bar * K (K) over bar loop generates a peak around 1420 MeV in the invariant mass of pi(-) a(0) or pi(-) f(0), and it gives sizable branching fractions, Br(B- -> D*(0)pi(-) a(0); a(0) -> pi(0)eta) = (1.66 +/- 0.45) x 10(-6) and Br(B- -> D*(0)pi(-) f(0); f(0) -> pi(+)pi(-)) = (2.82 +/- 0.75) x 10(-6).
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