We study the $$D^+ \rightarrow \pi ^+ \eta \eta $$ and $$D^+ \rightarrow \pi ^+ \pi ^0 \eta $$ reactions, which are single Cabibbo suppressed and can proceed both through internal and external emission. The primary mechanisms at quark level are considered, followed by hadronization to produce three mesons in the $$D^+$$ decay, and after that the final state interaction of these...
We develop a model to study the $$D^0 \rightarrow K^- \pi ^+ \eta $$ weak decay, starting with the color favored external emission and Cabibbo favored mode at the quark level. A less favored internal emission decay mode is also studied as a source of small corrections. Some pairs of quarks are allowed to hadronize producing two pseudoscalar mesons, which posteriorly are allowed...
We analyze the $$D{\bar{D}}$$ mass distribution from a recent Belle experiment on the $$e^+e^- \rightarrow J/\psi D{\bar{D}}$$ reaction, and show that the mass distribution divided by phase space does not have a clear peak above the $$D{\bar{D}}$$ threshold that justifies the experimental claim of a $$\chi _{c0}(2P)$$ state from those data. Then we use a unitary formalism with...
Eur. Phys. J. C Triangle singularity in B− → K − X (3872); X → π 0π +π − and the X(3872) mass Raquel Molina 0 Eulogio Oset 1 0 Departamento de Física Teórica, Facultad de Física, Universidad
We perform a calculation of the mass distribution in the $$\psi (3770) \rightarrow \gamma D {\bar{D}}$$ decay, studying both the $$D^+ D^- $$ and $$D^0 {\bar{D}}^0 $$ decays. The electromagnetic interaction is such that the tree level amplitude is null for the neutral channel, which forces the $$\psi (3770) \rightarrow \gamma D^0 {\bar{D}}^0$$ transition to go through a loop...
Eur. Phys. J. C Semileptonic decay of B? into X (3930), X (3940), X (4160) c Natsumi Ikeno 0 Melahat Bayar 1 Eulogio Oset 2 0 Department of Life and Environmental Agricultural Sciences, Tottori
We study the \(J/\psi \rightarrow K^+ K^- f_0(980)(a_0(980))\) reaction and find that the mechanism to produce this decay develops a triangle singularity around \(M_{\mathrm{inv}}(K^- f_0/K^- a_0) \approx 1515\) MeV. The differential width \(d\varGamma / dM_{\mathrm{inv}}(K^- f_0/K^- a_0)\) shows a rapid growth around the invariant mass being 1515 MeV as a consequence of the...
A theoretical investigation is done to clarify the origin of the peak structure observed near the K−ppK−pp threshold in the in-flight 3He(K−,Λp)n3He(K−,Λp)n reaction of the J-PARC E15 experiment, which could be a signal of the lightest kaonic nuclei, i.e., the K¯NN(I=1/2)K¯NN(I=1/2) state. For the investigation, we evaluate the ΛpΛp invariant mass spectrum assuming two possible...
From the perspective that \(\Lambda _c(2595)\) and \(\Lambda _c(2625)\) are dynamically generated resonances from the \(DN,~D^*N\) interaction and coupled channels, we have evaluated the rates for \(\Lambda _b \rightarrow \pi ^- \Lambda _c(2595)\) and \(\Lambda _b \rightarrow \pi ^- \Lambda _c(2625)\) up to a global unknown factor that allows us to calculate the ratio of rates...
We study the \(\chi _{c1} \rightarrow \eta \pi ^+ \pi ^-\) decay, paying attention to the production of \(f_0(500)\), \(f_0(980)\), and \(a_0(980)\) from the final state interaction of pairs of mesons that can lead to these three mesons in the final state, which is implemented using the chiral unitary approach. Very clean and strong signals are obtained for the \(a_0(980...
Assuming that the f2(1270), f′2(1525), a2(1320), and K*2(1430) resonances are dynamically generated states from the vector meson-vector meson interactions in L = 0 and spin 2, we study the γp → f2(1270)[f′2(1525)]p, γp → a02 (1320)p, and γp → K*2(1430)Λ(Σ) reactions. For the γp → f2(1270)p reaction, we find that the theoretical results for the differential cross sections are in...
Assuming that the f2(1270), f′2(1525), a2(1320), and K*2(1430) resonances are dynamically generated states from the vector meson-vector meson interactions in L = 0 and spin 2, we study the γp → f2(1270)[f′2(1525)]p, γp → a02 (1320)p, and γp → K*2(1430)Λ(Σ) reactions. For the γp → f2(1270)p reaction, we find that the theoretical results for the differential cross sections are in...
Assuming that the f2(1270), f′2(1525), a2(1320), and K*2(1430) resonances are dynamically generated states from the vector meson-vector meson interactions in L = 0 and spin 2, we study the γp → f2(1270)[f′2(1525)]p, γp → a02 (1320)p, and γp → K*2(1430)Λ(Σ) reactions. For the γp → f2(1270)p reaction, we find that the theoretical results for the differential cross sections are in...
Predictions for hidden charm molecules, with and without strangeness, were made prior to the LHCb experiment. We discuss these issues and how these states can be observed in the reactions, Λb → J/ψK−p, Λb → J/ψηΛ, Λb → J/ψπ−p, Λb → J/ψK0Λ and Ξ−b → J/ψK−Λ by looking at the invariant mass distributions for J/ψp or J/ψΛ.
We study the nucleon-nucleon interaction in the isoscalar-scalar channel using the chiral unitary approach. The t-matrix of the pion-pion scattering in this channel is summed up to all orders using the B-S equation. We find that the calculated results at long distances are close to those of the σ exchange interaction. In addition, there appears a shorter range repulsion in this...
