Role of the triangle singularity in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">Λ</mml:mi><mml:mo>(</mml:mo><mml:mn>1405</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>
 production in the 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>π</mml:mi><mml:mi mathvariant="normal">Σ</m

The decay of Λ þ c into π þ π 0 Λð1405Þ with the Λð1405Þ decay into π 0 Σ 0 through a triangle diagram is studied. This process is initiated by Λ þ c → π þKÃ N, and then theK Ã decays intoKπ andKN produce the Λð1405Þ through a triangle loop containingK Ã NK which develops a singularity around 1890 MeV. This process is prohibited by the isospin symmetry, but the decay into this channel is enhanced by the contribution of the triangle diagram, which is sensitive to the mass of the internal particles. We find a narrow peak in the π 0 Σ 0 invariant mass distribution, which originates from the Λð1405Þ amplitude, but is tied to the mass differences between the charged and neutralK or N states. The observation of the unavoidable peak of the triangle singularity in the isospin-violating Λð1405Þ production would provide further support for the hadronic molecular picture of the Λð1405Þ and further information on theKN interaction.

show abstract

“…Meanwhile, the possible effect of the TS on the Λð1405Þ production was studied in Refs. [50][51][52]. Now, as found in Refs.…”

Section: Introductionmentioning

confidence: 50%

Anomalous enhancement of the isospin-violating Λ(1405) production by a triangle singularity in Λc→

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…[88], the effect of the TS on the angle and the energy dependence of Λ(1405) photoproduction was studied. More recently, in pion-induced and proton-proton collisions a clear peak around 2100 MeV in the KΛ(1405) invariant mass has been found, due to the resonance peak of a N * state that plays a crucial role in the K * Σ production [89]. This mechanism produces the peak of the Λ(1405) around or below 1400 MeV, as it was seen in the HADES experiment pp → pK + πΣ [69].…”

Section: Theoretical Models For the λ(1405) Productionmentioning

confidence: 81%

Strangeness in nuclei and neutron stars

Tolós

Fabbietti

2020

Progress in Particle and Nuclear Physics

188

View full text Add to dashboard Cite

We review the present status of the experimental and theoretical developments in the field of strangeness in nuclei and neutron stars. We start by discussing theKN interaction, that is governed by the presence of the Λ(1405). We continue by showing the two-pole nature of the Λ(1405), and the production mechanisms in photon-, pion-, kaon-induced reactions as well as proton-proton collisions, while discussing the formation ofKN N bound states. We then move to the theoretical and experimental analysis of the properties of kaons and antikaons in dense nuclear matter, paying a special attention to kaonic atoms and the analysis of strangeness creation and propagation in nuclear collisions. Next, we examine the φ meson and the advances in photoproduction, protoninduced and pion-induced reactions, so as to understand its properties in dense matter. Finally, we address the dynamics of hyperons with nucleons and nuclear matter, and the connection to the phases of dense matter with strangeness in the interior of neutron stars.

show abstract

“…Predictions on the decay widths to the open channels can be made precisely using the couplings obtained in Table 11 and the formula of Ref. [85], which has the form…”

Section: Molecular C States Generated From Meson-baryon Statesmentioning

confidence: 99%

Description of the $$\Xi _c$$ Ξ c and $$\Xi _b$$ Ξ b states as molecular states

Pavao

Debastiani

et al. 2019

Eur. Phys. J. C

Self Cite

View full text Add to dashboard Cite

In this work we study several c and b states dynamically generated from the meson-baryon interaction in coupled channels, using an extension of the local hidden gauge approach in the Bethe-Salpeter equation. These molecular states appear as poles of the scattering amplitudes, and several of them can be identified with the experimentally observed c states, including the c (2790), c (2930), c (2970), c (3055) and c (3080). Also, for the recently reported b (6227) state, we find two poles with masses and widths remarkably close to the experimental data, for both the J P = 1/2 − and J P = 3/2 − sectors.

show abstract

Role of the triangle singularity in Λ(1405) production in the π−p→K0πΣ

Cited by 22 publications

References 82 publications

Anomalous enhancement of the isospin-violating Λ(1405) production by a triangle singularity in Λc→

Anomalous enhancement of the isospin-violating Λ(1405) production by a triangle singularity in Λc→

Strangeness in nuclei and neutron stars

Description of the $$\Xi _c$$ Ξ c and $$\Xi _b$$ Ξ b states as molecular states

Contact Info

Product

Resources

About