Triangle singularities in B^-→ D^*0π ^-π ⁰η B - → D ∗ 0 π - π 0 η and B^-→ D^*0π ^-π ⁺π ^- B - → D ∗ 0 π - π + π -

2017/06/30 by R. Pavao, S. Sakai, E. Oset
Physics and Astronomy · #Branching fraction #Gravitational singularity #High-Energy Particle Collisions Research #Invariant (physics) #Loop (graph theory) #Particle decay #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Singularity #hep-ph

paper · pdf · doi:10.1140/epjc/s10052-017-5169-y

10 pages, 7 figures

arxiv created 2017/07/05 · openalex created_date 2017/07/14 · openalex publication_date 2017/09/01 · arxiv updated 2017/10/11 · openalex updated_date 2026/08/05

Abstract

The possible role of the triangle mechanism in the B^- decay into D^*0π ^-π ⁰η and D^*0π ^-π ⁺π ^- is investigated. In this process, the triangle singularity appears from the decay of B^- into D^*0K^-K^*0 followed by the decay of K^*0 into π ^-K⁺ and the fusion of the K⁺K^- , which forms the a₀(980) or f₀(980) , which finally decay into π ⁰η or π ⁺π ^- , respectively. The triangle mechanism from the K^*KK loop generates a peak around 1420 MeV in the invariant mass of π ^-a₀ or π ^-f₀ , and it gives sizable branching fractions, Br(B^-→ D^*0π ^- a₀;a₀ → π ⁰η )= (1.66± 0.45 )× 10^-6 and Br(B^-→ D^*0π ^- f₀ ; f₀ → π ⁺π ^-)= (2.82± 0.75)× 10^-6 .

Citations

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