A nonperturbative method which combines constraints from chiral symmetry breaking and coupled channel unitarity is used to describe the meson-meson interaction up about 1.2 GeV. The approach uses $\mathcal{O}{(p}^{2})$ $\mathcal{O}{(p}^{4})$ Lagrangians. seven free parameters of Lagrangian are fitted data. results in good agreement with a vast amount experimental analyses. amplitudes develop poles complex plane corresponding ${f}_{0}, {a}_{0}, \ensuremath{\rho}, {K}^{*},...

The most general structure of an elastic partial wave amplitude when the unphysical cuts are neglected is deduced in terms $N/D$ method. This result then matched to lowest order, $\mathcal{O}{(p}^{2}),$ chiral perturbation theory (\ensuremath{\chi}PT) and exchange (consistent with symmetry) resonances $s$ channel. extension method coupled channels also given. Making use former formalism, \ensuremath{\pi}\ensuremath{\pi} $K\ensuremath{\pi} (I=1/2)$ $P$-wave scattering amplitudes described...

The interaction between various charmed mesons and baryons is studied within the framework of coupled-channel unitary approach with local hidden gauge formalism. Several meson-baryon dynamically generated narrow N* Λ* resonances charm are predicted mass above 4 GeV width smaller than 100 MeV. new definitely cannot be accommodated by quark models three constituent quarks can looked for in forthcoming PANDA/FAIR experiments.

We perform an analytical study of the scattering matrix and bound states in problems with many physical coupled channels. establish relationship couplings to different channels, obtained from residues at poles, wave functions for The basically reflect value around origin coordinate space. In concrete case X(3872) resonance, understood as a state $\ddn$ $\ddc$ (and $c.c.$), loosely bound, we find that two channels are essentially equal leading good isospin I=0 character. This is spite having...

The interactions of $\mathrm{D\ifmmode \bar{}\else \={}\fi{}}{\ensuremath{\Sigma}}_{c}$-$\mathrm{D\ifmmode \={}\fi{}}{\ensuremath{\Lambda}}_{c}$, ${\mathrm{D\ifmmode \={}\fi{}}}^{*}{\ensuremath{\Sigma}}_{c}$-${\mathrm{D\ifmmode \={}\fi{}}}^{*}{\ensuremath{\Lambda}}_{c}$, and related strangeness channels, are studied within the framework coupled-channel unitary approach with local hidden gauge formalism. A series meson-baryon dynamically generated relatively narrow ${N}^{*}$...

We present a coupled channel unitary approach to obtain states dynamically generated from the meson-baryon interaction with hidden charm, using constraints of heavy quark spin symmetry. As basis states, we use $\overline{D}B$, ${\overline{D}}^{*}B$ $B$ baryon charmed belonging 20 representations SU(4) ${J}^{P}=1/{2}^{+}$, $3/{2}^{+}$. In addition also include ${\ensuremath{\eta}}_{c}N$ and $J/\ensuremath{\psi}N$ states. The inclusion these channels is demanded by symmetry, since in large...

We perform a theoretical analysis of the $\Lambda_b \to J/\psi K^- p$ reaction from where recent LHCb experiment extracts $\Lambda(1405)$ contribution in $K^- spectrum close to threshold and two baryon states hidden charm $J/\psi\,p$ spectrum. recall that this type have been theoretically predicted matching mass, width $J^P$ experiment, concretely some built up $J/\psi\, N$, $\bar D^* \Lambda_c$, \Sigma_c$, D \Sigma^*_c$ coupled channels. assume observed narrow state around 4450 MeV has...

We consider the ${\overline{D}}^{(*)}{\mathrm{\ensuremath{\Sigma}}}_{c}^{(*)}$ states, together with $J/\ensuremath{\psi}N$ and other coupled channels, take an interaction consistent heavy quark spin symmetry, dynamical input obtained from extension of local hidden gauge approach. By fitting only one parameter to recent three pentaquark states reported by LHCb Collaboration, we can reproduce them in base mass width, providing for quantum numbers approximate molecular structure as...

We perform a unitary coupled channel study of the interaction ${D}^{*+}{D}^{0},{D}^{*0}{D}^{+}$ channels and find state barely bound, very close to isospin $I=0$. take experimental mass as input obtain width ${D}^{0}{D}^{0}{\ensuremath{\pi}}^{+}$ distribution. When ${T}_{cc}$ quoted in paper from raw data is used, obtained order 80 keV, small compared value given that work. Yet, when an analysis considering resolution taken, about 43 keV both distribution are remarkable agreement with...

We study from the theoretical point of view <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msubsup><a:mi mathvariant="normal">Λ</a:mi><a:mi>c</a:mi><a:mo>+</a:mo></a:msubsup><a:mo stretchy="false">→</a:mo><a:msup><a:mi>π</a:mi><a:mo>+</a:mo></a:msup><a:mi>η</a:mi><a:mi mathvariant="normal">Λ</a:mi></a:math> reaction, recently measured by Belle and BESIII Collaborations, where clear signals are observed for <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"...

We develop a coupled channel unitary approach describing the behavior at higher energies of systems whose low-energy dynamics is given by effective $O({p}^{2})$ and $O({p}^{4})$ chiral Lagrangians. Our free parameters are those Lagrangian. When applied to meson-meson interaction, it yields remarkable agreement with data up $\sqrt{s}\ensuremath{\simeq}1.2\mathrm{GeV}$, dynamically generating $\ensuremath{\sigma}$, ${f}_{0}$, ${a}_{0}$, $\ensuremath{\rho}$, ${K}^{*}$ resonances. Further...

We will study open and hidden charm scalar meson resonances within two different models. The first one is a direct application of chiral Lagrangian already used to flavor symmetry breaking in Skyrme In another approach the problem $SU(4)$ symmetric built broken down $SU(3)$ by identifying currents where heavy mesons are exchanged suppressing those. Unitarization coupled channels leads dynamical generation both models, particular, new resonance with mass 3.7 GeV predicted. small differences...

We propose that the quenching of Gamow-Teller matrix elements in light nuclei can be effectively described by a mechanism governs $p$-wave pion-nucleus scattering. This may providing solution to long-standing problem. The resulting Landau-Migdal parameter ${g}^{\ensuremath{'}}$ turns out quite consistent with values extracted from spectra pionlike excitations and places stringent constraint on pion condensation nuclear matter.

We study the S-wave interaction of mesons with baryons in strangeness S=0 sector a coupled channel unitary approach. The basic dynamics is drawn from lowest order meson baryon chiral Lagrangians. Small modifications inspired by models explicit vector exchange t-channel are also considered. In addition pi N included and shown to have an important repercussion results, particularly isospin 3/2 sector.

We make a theoretical study of the $s$-wave interaction nonet vector mesons with octet pseudoscalar starting from chiral invariant Lagrangian and implementing unitarity in coupled channels. By looking for poles unphysical Riemann sheets unitarized scattering amplitudes, we get two octets one singlet axial-vector dynamically generated resonances. The found can be associated most low lying resonances quoted by Particle Data Group: ${b}_{1}(1235)$, ${h}_{1}(1170)$, ${h}_{1}(1380)$,...

The formalism developed recently to study vector meson-vector meson interaction, and applied the case of $\ensuremath{\rho}\ensuremath{\rho}$, is extended interaction nonet mesons among themselves. leads poles scattering matrix corresponding bound states or resonances. We show that 11 (either resonant) get dynamically generated in nine strangeness-isospin-spin channels. Five them can be identified with those reported PDG, i.e., ${f}_{0}(1370)$, ${f}_{0}(1710)$, ${f}_{2}(1270)$,...