Triangle singularities in $$B^-\rightarrow D^{*0}\pi ^-\pi ^0\eta $$ B - → D ∗ 0 π - π 0 η and $$B^-\rightarrow D^{*0}\pi ^-\pi ^+\pi ^-$$ B - → D ∗ 0 π - π + π -

Abstract

The possible role of the triangle mechanism in the B − decay into D * 0 π − π 0 η and D * 0 π − π + π − is investigated. In this process, the triangle singularity appears from the decay of B − into D * 0 K − K * 0 followed by the decay of K * 0 into π − K + and the fusion of the K + K − , which forms the a 0 (980) or f 0 (980), which finally decay into π 0 η or π + π − , respectively. The triangle mechanism from theK * KK loop generates a peak around 1420 MeV in the invariant mass of π − a 0 or π − f 0 , and it gives sizable branching fractions,

Internal particle width effects on the triangle singularity mechanism in the study of the η(1405) and η(1475) puzzle

“…This feature suggests that for relatively narrow widths the treatment of Ref. [55] can also provide a reliable evaluation of the TS contributions. Figure 6 also shows that when s 1 goes closer to s 1c , the amplitude becomes larger.…”

Theoretical description of the J/ψ→η(η′)hWu1, Sakai2, Oset3 2019Phys. Rev. DSelf Cite11190View full textAdd to dashboardCite

“…Here we take into account explicitly the h 1 ð1380Þ and K Ãþ propagators, and hence, automatically the mass distribution of these two states. We have now the double differential mass distribution [51]…”

Role of the triangle singularity in Λ(1405) production in the π−p→K0πΣBayar1, Pavao2, Sakai3 et al. 2018Phys. Rev. CSelf Cite220170View full textAdd to dashboardCite

“…The studies of many processes including the triangle singularity elucidate the possible effect of the triangle singularity on the hadron properties, e.g., the η(1405) decay into π 0 a 0 or π 0 f 0 [44][45][46], the possible origin of Z c (3900) [47][48][49], the speculation on the pentaquark candidate P c [50][51][52] (see Ref. [53] for a critical discussion to the light of the preferred experimental quantum numbers [54]), the B s decay into Bππ [55] and B − decays [56,57]. Here, we note that the strength of the triangle peak is tightly connected with the coupling strength of the two hadrons merging into a third one.…”