Search results for: E. Oset

Items from 1 to 20 out of 219 results

article

The $B^{+} \rightarrow J/\psi\omega K^{+}$ B + → J / ψ ω K + reaction and $D^{\ast} \bar{D}^{\ast}$ D * D ¯ * molecular states

L. R. Dai, G. Y. Wang, X. Chen, E. Wang, more

The European Physical Journal A > 2019 > 55 > 3 > 1-7

. We study the $B^{+} \rightarrow J/\psi \omega K^{+}$ B + → J / ψ ω K + reaction, and show that it is driven by the presence of two resonances, the X(3940) and X(3930), that are of molecular nature and couple most strongly to $D^{\ast} \bar{D}^{\ast}$ D * D ¯ * , but also to $J/\psi\omega$ J / ψ ω . Because of that, in the $J/\psi\omega$ J / ψ ω mass distribution...

article

Description of the $$\Xi _c$$ Ξc and $$\Xi _b$$ Ξb states as molecular states

Q. X. Yu, R. Pavao, V. R. Debastiani, E. Oset

The European Physical Journal C > 2019 > 79 > 2 > 1-14

In this work we study several $$\Xi _c$$ Ξc and $$\Xi _b$$ Ξb 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 $$\Xi _c$$ Ξc states, including...

article

$\tau^{-}\rightarrow \nu_{\tau} M_{1}M_{2}$ τ - → ν τ M 1 M 2 , with M₁, M₂ pseudoscalar or vector mesons

L. R. Dai, R. Pavao, S. Sakai, E. Oset

The European Physical Journal A > 2019 > 55 > 2 > 1-22

. We perform a calculation of the $\tau^{-} \rightarrow \nu_{\tau} M_{1} M_{2}$ τ - → ν τ M 1 M 2 , with $M_{1}, M_{2}$ M 1 , M 2 either pseudoscalar or vector mesons using the basic weak interaction and angular momentum algebra to relate the different processes. The formalism also leads to a different interpretation of the role played by G-parity in these decays. We also...

article

Considerations on the Schmid theorem for triangle singularities

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

The European Physical Journal C > 2019 > 79 > 1 > 1-13

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 particles, the possible triangle singularity developed by the mechanism of elastic rescattering of two of the three decay particles does not change the cross section provided by the tree level. We investigate the process...

article

Polarization amplitudes in $\tau^{-} \rightarrow \nu_{\tau} VP$ τ - → ν τ V P decay beyond the Standard Model

L. R. Dai, E. Oset

The European Physical Journal A > 2018 > 54 > 12 > 1-10

. We study the amplitudes of the $\tau^{-} \rightarrow \nu_{\tau} VP$ τ - → ν τ V P decay for the different polarizations of the vector meson V, using a formalism where the mapping from the quark degrees of freedom to the meson ones is done with the ³P₀ model. We extend the formalism to a case, with the operator $\gamma^{\mu} -\alpha\gamma^{\mu} \gamma_{5}$ γ μ - α γ μ γ 5 , that...

article

Helicity amplitudes in $$B \rightarrow D^{*} \bar{\nu } l$$ B→D∗ν¯l decay

L. R. Dai, E. Oset

The European Physical Journal C > 2018 > 78 > 11 > 1-11

We use a recent formalism of the weak hadronic reactions that maps the transition matrix elements at the quark level into hadronic matrix elements, evaluated with an elaborate angular momentum algebra that allows finally to write the weak matrix elements in terms of easy analytical formulas. In particular they appear explicitly for the different spin third components of the vector mesons involved...

article

Coupled channels dynamics in the generation of the $$\Omega (2012)$$ Ω(2012) resonance

R. Pavao, E. Oset

The European Physical Journal C > 2018 > 78 > 10 > 1-8

We look into the newly observed $$\Omega (2012)$$ Ω(2012) state from the molecular perspective in which the resonance is generated from the $$\bar{K} \Xi ^*$$ K¯Ξ∗ , $$\eta \Omega $$ ηΩ and $$\bar{K} \Xi $$ K¯Ξ channels. We find that this picture provides a natural explanation of the properties of the $$\Omega (2012)$$ Ω(2012) state. We stress that the molecular nature of the resonance is revealed...

article

Effective Field Theories in a Finite Volume

A. Martínez Torres, S. Prelovsek, E. Oset, A. Ramos

Few-Body Systems > 2018 > 59 > 6 > 1-5

In this talk I present the formalism we have used to analyze Lattice data on two meson systems by means of effective field theories. In particular I present the results obtained from a reanalysis of the lattice data on the $$KD^{(*)}$$ KD(∗) systems, where the states $$D^*_{s0}(2317)$$ Ds0∗(2317) and $$D^*_{s1}(2460)$$ Ds1∗(2460) are found as bound states of KD and $$KD^*$$ KD∗ , respectively....

article

Pseudoscalar or vector meson production in non-leptonic decays of heavy hadrons

Wei-Hong Liang, E. Oset

The European Physical Journal C > 2018 > 78 > 6 > 1-26

We have addressed the study of non-leptonic weak decays of heavy hadrons ($$\Lambda _b, \Lambda _c, B$$ Λb,Λc,B and D), with external and internal emission to give two final hadrons, taking into account the spin-angular momentum structure of the mesons and baryons produced. A detailed angular momentum formulation is developed which leads to easy final formulas. By means of them we have made predictions...

article

Recent Developments in Chiral Unitary Theory and Triangle Singularities Involving Baryons

E. Oset, M. Bayar, F. Aceti, F. K. Guo, more

Few-Body Systems > 2018 > 59 > 5 > 1-12

We report on several reactions involving baryons that develop triangle singularities. The combination of elements of chiral unitary theory with the triangle mechanisms explain different features of reactions and shed light on some decay modes of several resonances. We address the role of a triangle singularity in the $$\pi N(1535)$$ πN(1535) contribution to $$\gamma p \rightarrow p \pi ^0 \eta $$...

article

Disclosing $$D^\bar{D}^$$ D∗D¯∗ molecular states in the $$B_c^- \rightarrow \pi ^- J/\psi \omega $$ Bc-→π-J/ψω decay

L. R. Dai, J. M. Dias, E. Oset

The European Physical Journal C > 2018 > 78 > 3 > 1-7

We study the $$B_c^- \rightarrow \pi ^- J/\psi \omega $$ Bc-→π-J/ψω and $$B_c^- \rightarrow \pi ^- D^* \bar{D}^*$$ Bc-→π-D∗D¯∗ reactions and show that they are related by the presence of two resonances, the X(3940) and X(3930), that are of molecular nature and couple most strongly to $$D^* \bar{D}^*$$ D∗D¯∗ , but also to $$J/\psi \omega $$ J/ψω . Because of that, in the $$J/\psi \omega $$ J/ψω ...

article

Triangle singularities in $B^{-} \rightarrow K^{-}\pi^{-}D^{+}_{s0}$ B-→K-π-Ds0+ and $B^{-} \rightarrow K^{-}\pi^{-}D^{+}_{s1}$ B-→K-π-Ds1+

S. Sakai, E. Oset, A. Ramos

The European Physical Journal A > 2018 > 54 > 1 > 1-14

. We study the appearance of structures in the decay of the $B^{-}$ B- into $ K^{-} \pi^{-} D_{s0}^{+}(2317)$ K-π-Ds0+(2317) and $ K^- \pi^- D_{s1}^+(2460)$ K-π-Ds1+(2460) final states by forming invariant mass distributions of $\pi^- D_{s0}^+$ π-Ds0+ and $\pi^- D_{s1}^+$ π-Ds1+ pairs, respectively. The structure in the distribution is associated to the kinematical triangle singularity that appears...

article

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 -

R. Pavao, S. Sakai, E. Oset

The European Physical Journal C > 2017 > 77 > 9 > 1-8

The possible role of the triangle mechanism in the $$B^-$$ B - decay into $$D^{*0}\pi ^-\pi ^0\eta $$ D ∗ 0 π - π 0 η and $$D^{*0}\pi ^-\pi ^+\pi ^-$$ D ∗ 0 π - π + π - is investigated. In this process, the triangle singularity appears from the decay of $$B^-$$ B - into $$D^{*0}K^-K^{*0}$$ D ∗ 0 K - K ∗ 0 followed...

article

Predictions for $$\Xi _b^- \rightarrow \pi ^- (D_s^- ) \ \Xi _c^0 (2790) \left( \Xi _c^0 (2815) \right) $$ Ξ b - → π - ( D s - ) Ξ c 0 ( 2790 ) Ξ c 0 ( 2815 ) and $$\Xi _b^- \rightarrow \bar{\nu }_l l \ \Xi _c^0 (2790) \left( \Xi _c^0 (2815) \right) $$ Ξ b - → ν ¯ l l Ξ c 0 ( 2790 ) Ξ c 0 ( 2815 )

R. P. Pavao, Wei-Hong Liang, J. Nieves, E. Oset

The European Physical Journal C > 2017 > 77 > 4 > 1-12

We have performed calculations for the nonleptonic $$\Xi _b^- \rightarrow \pi ^- \ \Xi _c^0 (2790) \left( J=\frac{1}{2}\right) $$ Ξ b - → π - Ξ c 0 ( 2790 ) J = 1 2 and $$\Xi _b^- \rightarrow \pi ^- \ \Xi _c^0 (2815) \left( J=\frac{3}{2}\right) $$ Ξ b - → π - Ξ c 0 ( 2815 ) J = 3 2 decays and the same reactions replacing the $$\pi ^-$$ π - ...

article

Predictions for ηc→ηπ+π− producing f0(500), f0(980) and a0(980)

V. R. Debastiani, Wei-Hong Liang, Ju-Jun Xie, E. Oset

Physics Letters B > 2017 > 766 > C > 59-64

We perform calculations for the ηc→ηπ+π− decay using elements of SU(3) symmetry to see the weight of different trios of pseudoscalars produced in this decay, prior to the final state interaction of the mesons. After that, the interaction of pairs of mesons, leading finally to ηπ+π−, is done using the chiral unitary approach. We evaluate the π+π− and πη mass distributions and find large and clear signals...

article

On the hidden charm pentaquarks in $$\Lambda _b \rightarrow J/\psi K^- p$$ Λ b → J / ψ K - p decay

L. Roca, E. Oset

The European Physical Journal C > 2016 > 76 > 11 > 1-12

In a previous work we presented a theoretical analysis of the $$\Lambda _b \rightarrow J/\psi K^- p$$ Λ b → J / ψ K - p reaction based on which a recent experiment by the LHCb collaboration at CERN claimed the existence of two hidden charm pentaquarks, $$P_c(4380)^+$$ P c ( 4380 ) + and $$P_c(4450)^+$$ P c ( 4450 ) + . In that work we focused only on...

article

A hidden-charm $$\varvec{S=-1}$$ S = - 1 pentaquark from the decay of $$\varvec{\varLambda _b}$$ Λ b into $$\varvec{J/\psi \, \eta \varLambda }$$ J / ψ η Λ states

A. Feijoo, V. K. Magas, A. Ramos, E. Oset

The European Physical Journal C > 2016 > 76 > 8 > 1-12

The hidden-charm pentaquark $$P_c(4450)$$ P c ( 4450 ) observed recently by the LHCb collaboration may be of molecular nature, as advocated by some unitary approaches that also predict pentaquark partners in the strangeness $$S=-1$$ S = - 1 sector. In this work we argue that a hidden-charm strange pentaquark could be seen from the decay of the $$\varLambda _b$$ Λ b...

chapter

Microscopic calculation of absorption channels in pion elastic scattering from light nuclei

E. Oset, W. Weise

Lecture Notes in Physics > Few Body Systems and Nuclear Forces I > 424-427

chapter

Dipole sum rule enhancement in nuclei

R. C. Carrasco, E. Oset, W. Weise

Lecture Notes in Physics > Perspectives on Photon Interactions with Hadrons and Nuclei > 246-251

In this work we apply a microscopic many-body approach to photonuclear reactions^[1] in order to improve the understanding of the dipole sum rule. At the same time, the sum rule provides us with test of consistency of the underlying theory at low photon energies

chapter

Photonuclear reactions

E. Oset

Lecture Notes in Physics > Response of the Nuclear System to External Forces > 131-151

A successful many body approach to evaluate inclusive photonuclear cross sections is reviewed. The lectures begin with an exposition of the state of the art in the elementary reactions γN → πN and γN → ππN, which are the basic building blocks for the many body theory. Through the skilful use of Field Theoretical Techniques one can disentangle the different reaction channels in the total photonuclear...

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Search results for: E. Oset

The $B^{+} \rightarrow J/\psi\omega K^{+}$ B + → J / ψ ω K + reaction and $D^{\ast} \bar{D}^{\ast}$ D * D ¯ * molecular states

Description of the $$\Xi _c$$ Ξc and $$\Xi _b$$ Ξb states as molecular states

$\tau^{-}\rightarrow \nu_{\tau} M_{1}M_{2}$ τ - → ν τ M 1 M 2 , with M₁, M₂ pseudoscalar or vector mesons

Considerations on the Schmid theorem for triangle singularities

Polarization amplitudes in $\tau^{-} \rightarrow \nu_{\tau} VP$ τ - → ν τ V P decay beyond the Standard Model

Helicity amplitudes in $$B \rightarrow D^{*} \bar{\nu } l$$ B→D∗ν¯l decay

Coupled channels dynamics in the generation of the $$\Omega (2012)$$ Ω(2012) resonance

Effective Field Theories in a Finite Volume

Pseudoscalar or vector meson production in non-leptonic decays of heavy hadrons

Recent Developments in Chiral Unitary Theory and Triangle Singularities Involving Baryons

Disclosing $$D^\bar{D}^$$ D∗D¯∗ molecular states in the $$B_c^- \rightarrow \pi ^- J/\psi \omega $$ Bc-→π-J/ψω decay

Triangle singularities in $B^{-} \rightarrow K^{-}\pi^{-}D^{+}_{s0}$ B-→K-π-Ds0+ and $B^{-} \rightarrow K^{-}\pi^{-}D^{+}_{s1}$ B-→K-π-Ds1+

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 -

Predictions for ηc→ηπ+π− producing f0(500), f0(980) and a0(980)

On the hidden charm pentaquarks in $$\Lambda _b \rightarrow J/\psi K^- p$$ Λ b → J / ψ K - p decay

A hidden-charm $$\varvec{S=-1}$$ S = - 1 pentaquark from the decay of $$\varvec{\varLambda _b}$$ Λ b into $$\varvec{J/\psi \, \eta \varLambda }$$ J / ψ η Λ states

Microscopic calculation of absorption channels in pion elastic scattering from light nuclei

Dipole sum rule enhancement in nuclei

Photonuclear reactions

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