S. Sakai

activity

20122023

most citedThreshold cusps and triangle singularities in hadronic reactions

306 citations · 958 across the 37 of their papers we have counts for

collaborators

37 papers

nucl-th2023★ 7 cited

Spectral function of the $η^{'}$ meson in nuclear medium based on phenomenological models

Shuntaro Sakai, Daisuke Jido

The in-medium modification of the spectral function of the $η^{'}$ meson with and without the spatial momentum is studied with the $T ρ$ approximation by employing two phenomenological…

hep-ph2021★ 2 cited

Investigation of the $X (4020)$ peak in the $D^{} D ˉ^{}$ and $π h_{c}$ channels

Shuntaro Sakai

In this paper, the nature of $X (4020)$ observed in the vicinity of the $D^{*} D ˉ^{*}$ threshold of the $π h_{c}$ and $D^{*} D ˉ^{*}$ distributions is studied. Using a model containing on…

hep-ph2020★ 13 cited

Possible precise measurements of the $X (3872)$ mass with the $e^{+} e^{-} \to π^{0} γ X (3872)$ and $p p ˉ \to γ X (3872)$ reactions

Shuntaro Sakai, Hao-Jie Jing, Feng-Kun Guo

It was recently proposed that the $X (3872)$ binding energy, the difference between the $D^{0} D ˉ^{* 0}$ threshold and the $X (3872)$ mass, can be precisely determined by measuring t…

hep-ph2020★ 17 cited

Extraction of $N D$ scattering lengths from the $Λ_{b} \to π^{-} p D^{0}$ decay and properties of the $Σ_{c} (2800)^{+}$

Shuntaro Sakai, Feng-Kun Guo, Bastian Kubis

The isovector and isoscalar $N D$ $s$ -wave scattering lengths are extracted by fitting to the LHCb data of the $p D^{0}$ invariant-mass distribution in the decay $Λ_b\rightarrowπ^-pD^0…

hep-ph2020★ 27 cited

Triangle singularity in the $B^{-} \to K^{-} π^{0} X (3872)$ reaction and sensitivity to the $X (3872)$ mass

Shuntaro Sakai, Eulogio Oset, Feng-Kun Guo

We have done a study of the $B^{-} \to K^{-} π^{0} X (3872)$ reaction by means of a triangle mechanism via the chain of reactions: $B^{-} \to K^{-} D^{* 0} D ˉ^{* 0}$ ; $D^{* 0} \to π^{0} D^{0}$ ; $…

hep-ph2020★ 11 cited

Role of the triangle mechanism in the $Λ_{b} \to Λ_{c} π^{-} f_{0} (980)$ reaction

Shuntaro Sakai

We investigate the $Λ_{b} \to Λ_{c} π^{-} f_{0} (980)$ production with a $f_{0} (980)$ decay into $π^{+} π^{-}$ via the $K^{* 0} K^{-} K^{+}$ and $K^{*-} K^{0} K ˉ^{0}$ triangle loops. These loops produce a pea…

hep-ph2020★ 306 cited

Threshold cusps and triangle singularities in hadronic reactions

Feng-Kun Guo, Xiao-Hai Liu, Shuntaro Sakai

The spectrum of hadrons is the manifestation of color confinement of quantum chromodynamics. Hadronic resonances correspond to poles of the S-matrix. Since 2003, lots of new hadron…

hep-ph2019★ 8 cited

$J / ψ \to γ π π$ , $γ π^{0} η$ reactions and the $f_{0} (980)$ and $a_{0} (980)$ resonances

S. Sakai, Wei-Hong Liang, G. Toledo +1

We study the $J / ψ \to γ π^{+} π^{-}$ , $γ π^{0} η$ reactions from the perspective that they come from the $J / ψ \to ϕ (ω) π^{+} π^{-}, ρ^{0} π^{0} η$ reactions, where the $ρ^{0}$ , $ω$ , and $ϕ$ get convert…

hep-ph2019★ 23 cited

Triangle singularities in $J / ψ \to η π^{0} ϕ$ and $π^{0} π^{0} ϕ$

Hao-Jie Jing, Shuntaro Sakai, Feng-Kun Guo +1

The BESIII Collaboration recently reported the observation of the $a_{0} (980)^{0} - f_{0} (980)$ mixing in the isospin breaking decay $J / ψ \to η π^{0} ϕ$ . In the Dalitz plot for that decay with…

hep-ph2019★ 72 cited

Decays of $P_{c}$ into $J / ψ N$ and $η_{c} N$ with heavy quark spin symmetry

Shuntaro Sakai, Hao-Jie Jing, Feng-Kun Guo

We investigate the consequences of heavy quark spin symmetry (HQSS) on hidden-charm pentaquark $P_{c}$ states. As has been proposed before, assuming the $P_{c} (4440)$ and the $P_c(4457…

hep-ph2019★ 12 cited

The $χ_{c J}$ decay to $ϕ K^{*} K ˉ, ϕ h_{1} (1380)$ testing the nature of axial vector meson resonances

Sheng-Juan Jiang, S. Sakai, Wei-Hong Liang +1

We perform a theoretical study of the $χ_{c J} \to ϕ K^{*} K ˉ \to ϕ K π K ˉ$ reaction taking into account the $K^{*} K ˉ$ final state interaction, which in the chiral unitary appr…

hep-ph2019★ 13 cited

Theoretical description of the $J / ψ \to η (η^{'}) h_{1} (1380)$ , $J / ψ \to η (η^{'}) h_{1} (1170)$ and $J / ψ \to π^{0} b_{1} (1235)^{0}$ reactions

Wei-Hong Liang, S. Sakai, E. Oset

We have made a study of the $J / ψ \to η^{'} h_{1}, η h_{1}$ (with $h_{1}$ being $h_{1} (1170)$ and $h_{1} (1380)$ ) and $J / ψ \to π^{0} b_{1} (1235)^{0}$ assuming the axial vector mesons to be dynamically gen…

hep-ph2019

$Λ_{b}$ decays into $Λ_{c}^{} ℓ ν ˉ_{ℓ}$ and $Λ_{c}^{} π^{-}$ $[Λ_{c}^{*} = Λ_{c} (2595)$ \& $Λ_{c} (2625)]$ and heavy quark spin symmetry

J. Nieves, R. Pavao, S. Sakai

We study the implications for $Λ_{b} \to Λ_{c}^{*} ℓ ν ˉ_{ℓ}$ and $Λ_{b} \to Λ_{c}^{*} π^{-}$ $[Λ_{c}^{*} = Λ_{c} (2595)$ and $Λ_{c} (2625)]$ decays that can be deduced from heavy quark spin symmetry (HQ…

hep-ph2018★ 30 cited

Considerations on the Schmid theorem for triangle singularities

V. R. Debastiani, S. Sakai, E. Oset

We investigate the Schmid theorem, which states that if one has a tree level mechanism with a particle decaying to two particles and one of them decaying posteriorly to two other p…

hep-ph2018★ 15 cited

$τ^{-} \to ν_{τ} M_{1} M_{2}$ , with $M_{1}, M_{2}$ pseudoscalar or vector mesons

L. R. Dai, R. Pavao, S. Sakai +1

We perform a calculation of the $τ^{-} \to ν_{τ} M_{1} M_{2}$ , with $M_{1}, M_{2}$ either pseudoscalar or vector mesons using the basic weak interaction and angular momentum algebra to relate…

hep-ph2018★ 27 cited

Anomalous enhancement of the isospin-violating $Λ (1405)$ production by a triangle singularity in $Λ_{c} \to π^{+} π^{0} π^{0} Σ^{0}$

L. R. Dai, R. Pavao, S. Sakai +1

The decay of $Λ_{c}^{+}$ into $π^{+} π^{0} Λ (1405)$ with the $Λ (1405)$ decay into $π^{0} Σ^{0}$ through a triangle diagram is studied. This process is initiated by $Λ_{c}^{+} \to π^{+} K ˉ^{*} N$ , t…

nucl-th2018★ 15 cited

Production of $N^{} (1535)$ and $N^{} (1650)$ in $Λ_{c} \to K ˉ^{0} η p$ $(π N)$ decay

R. Pavao, S. Sakai, E. Oset

In order to study the properties of the $N^{*}$ (1535) and $N^{*}$ (1650) we calculate the mass distributions of $M B$ in the $Λ_{c} \to K ˉ^{0} M B$ decay, with $MB=πN(I=1/2),ηp…

hep-ph2018★ 11 cited

Prediction of new states from $D^{()} B^{()} B ˉ^{(*)}$ three-body interactions

J. M. Dias, L. Roca, S. Sakai

We study three-body systems composed of $D^{(*)}$ , $B^{(*)}$ and $B ˉ^{(*)}$ in order to look for possible bound states or resonances. In order to solve the three-body problem,…

hep-ph2017★ 27 cited

Triangle singularity enhancing isospin violation in $B ˉ_{s}^{0} \to J / ψ π^{0} f_{0} (980)$

Wei-Hong Liang, S. Sakai, Ju-Jun Xie +1

We perform calculations for the $B ˉ_{s}^{0} \to J / ψ π^{0} f_{0} (980)$ and $B ˉ_{s}^{0} \to J / ψ π^{0} a_{0} (980)$ reactions, showing that the first one is isospin-suppressed while the second o…

hep-ph2017★ 21 cited

The role of the triangle singularity in $Λ (1405)$ production in the $π^{-} p \to K^{0} π Σ$ and $pp \to p K^{+} π Σ$ processes

M. Bayar, R. Pavao, S. Sakai +1

We have investigated the cross section for the $π^{-} p \to K^{0} π Σ$ and $pp \to p K^{+} π Σ$ reactions paying attention to a mechanism that develops a triangle singularity. Th…

hep-ph2017★ 22 cited

On the binding of the $B D D ˉ$ and $B D D$ systems

J. M. Dias, V. R. Debastiani, L. Roca +2

We study theoretically the $B D D ˉ$ and $B D D$ systems to see if they allow for possible bound or resonant states. The three-body interaction is evaluated implementing the Fixed…

hep-ph2017★ 28 cited

Abnormal isospin violation and $a_{0} - f_{0}$ mixing in the $D_{s}^{+} \to π^{+} π^{0} a_{0} (980) (f_{0} (980))$ reactions

S. Sakai, E. Oset, W. H. Liang

We have chosen the reactions $D_{s}^{+} \to π^{+} π^{0} a_{0} (980) (f_{0} (980))$ investigating the isospin violating channel $D_{s}^{+} \to π^{+} π^{0} f_{0} (980)$ . The reaction was chosen because by va…

hep-ph2017★ 28 cited

Triangle singularities in $B^{-} \to D^{* 0} π^{-} π^{0} η$ and $B^{-} \to D^{* 0} π^{-} π^{+} π^{-}$

R. Pavao, S. Sakai, E. Oset

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 th…

hep-ph2017★ 42 cited

Triangle singularities in $B^{-} \to K^{-} π^{-} D_{s 0}^{+}$ and $B^{-} \to K^{-} π^{-} D_{s 1}^{+}$

S. Sakai, E. Oset, A. Ramos

We study the appearance of structures in the decay of the $B^{-}$ into $K^{-} π^{-} D_{s 0}^{+} (2317)$ and $K^{-} π^{-} D_{s 1}^{+} (2460)$ final states by forming invariant mass distributions of $…

Spectral function of the η′ meson in nuclear medium based on phenomenological models

Investigation of the X(4020) peak in the D∗Dˉ∗ and πhc​ channels

Possible precise measurements of the X(3872) mass with the e+e−→π0γX(3872) and ppˉ​→γX(3872) reactions

Extraction of ND scattering lengths from the Λb​→π−pD0 decay and properties of the Σc​(2800)+

Triangle singularity in the B−→K−π0X(3872) reaction and sensitivity to the X(3872) mass

Role of the triangle mechanism in the Λb​→Λc​π−f0​(980) reaction

Threshold cusps and triangle singularities in hadronic reactions

J/ψ→γππ, γπ0η reactions and the f0​(980) and a0​(980) resonances

Triangle singularities in J/ψ→ηπ0ϕ and π0π0ϕ

Decays of Pc​ into J/ψN and ηc​N with heavy quark spin symmetry

The χcJ​ decay to ϕK∗Kˉ,ϕh1​(1380) testing the nature of axial vector meson resonances

Theoretical description of the J/ψ→η(η′)h1​(1380), J/ψ→η(η′)h1​(1170) and J/ψ→π0b1​(1235)0 reactions

Λb​ decays into Λc∗​ℓνˉℓ​ and Λc∗​π− [Λc∗​=Λc​(2595) \& Λc​(2625)] and heavy quark spin symmetry

Considerations on the Schmid theorem for triangle singularities

τ−→ντ​M1​M2​, with M1​,M2​ pseudoscalar or vector mesons

Anomalous enhancement of the isospin-violating Λ(1405) production by a triangle singularity in Λc​→π+π0π0Σ0

Production of N∗(1535) and N∗(1650) in Λc​→Kˉ0ηp (πN) decay

Prediction of new states from D(∗)B(∗)Bˉ(∗) three-body interactions

Triangle singularity enhancing isospin violation in Bˉs0​→J/ψπ0f0​(980)

The role of the triangle singularity in Λ(1405) production in the π−p→K0πΣ and pp→pK+πΣ processes

On the binding of the BDDˉ and BDD systems

Abnormal isospin violation and a0​−f0​ mixing in the Ds+​→π+π0a0​(980)(f0​(980)) reactions

Triangle singularities in B−→D∗0π−π0η and B−→D∗0π−π+π−

Triangle singularities in B−→K−π−Ds0+​ and B−→K−π−Ds1+​