ETHNP (Effective Theories in Hadron and Nuclear Physics)

3 sept. 2026 13:45 → 5 sept. 2026 13:00 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

1001-Primera-1-1-1 - Paterna. Seminario

Universe

Juan M Nieves (IFIC, CSIC-UV), Luis Alvarez Ruso (IFIC), Miguel Albaladejo (IFIC), Raquel Molina Peralta (IFIC-UV)

Descripción

The main goal of the event is to hold discussions about multi-hadron scattering, applications of Effective Field Theory methods and Lattice QCD in the hadron spectrum, and the development of new techniques to study hadron interactions, such as femtoscopy and correlation functions.

Participantes

Albert Feijoo Aliau
Alberto Martínez Torres
Amador García Lorenzo
Bhoomika Pandya
Bárbara Cid-Mora
Charlotte Van Hulse
Elena Santopinto
Emilie Passemar
Eulogio Oset
Feng-Kun Guo
Fernando Alvarado
Isaac Vidaña
Jesús Sánchez Illana
Jing Song
Jinzi Wu
Ju-Jun Xie
Juan M. Nieves
Julian Andrés Sánchez Muñoz
Kanchan Khemchandani
Li-Sheng Geng
Luis Álvarez Ruso
Manuel Pavón Valderrama
Manuel Vicente
Marta Sayago Rodríguez
Michael Doering
Miguel Albaladejo
Mikel Fernández Barbat
Naira Azucena Aldana Cotrina
Natsumi Ikeno
Pablo Encarnación
Pan-Pan Shi
Raquel Molina Peralta
Wen-Tao Lyu
Yuhang Jia
Zejian Zhuang
Ángel Miramontes

Contact

Miguel.Albaladejo@ific.uv.es

Raquel.Molina@ific.uv.es

jueves, 3 septiembre
- 14:45 → 16:30
  Session 1: Thursday afternoon: Session 1A
  - 15:00
    
    Quantum interference effects enhanced in π+p femtoscopic correlation functions 25m
    
    Ponente: Prof. Li-Sheng Geng (Beihang University)
    
    Li-Sheng-Geng.pdf
  - 15:30
    
    Probing K-molecule interactions via correlation functions: three-body bound states in K X(3872) and K D_{s0}^*(2317) 25m
    
    We study the interactions of a kaon with the exotic states X(3872) and D_{s0}^(2317), assumed as D\bar D^ and DK molecules with I=0. Using the fixed-center approximation to the Faddeev equations, we compute the three-body scattering amplitudes, unitarized via the Lippmann-Schwinger equation. For both systems, we find narrow resonant structures below the respective thresholds (about 50 MeV and 40 MeV) with widths of order 1 MeV, indicating three-body bound states. The corresponding correlation functions show clear deviations from unity at low momenta, characteristic of strong attraction. These predictions are directly testable in future correlation measurements (e.g., at ALICE) and in invariant-mass distributions, providing clear experimental signatures of the molecular nature of these resonances
    
    Ponente: Dr. Jing Song (Hainan University)
    
    Jing-Song_v2.pdf
  - 16:00
    
    Predicting $B^{(*)}\bar D{}^{(*)}$ states from a reanalysis of lattice QCD data 25m
    
    We reanalyze the lattice QCD data for the isoscalar $J^P=0^+$ and $1^+$ $\bar b \bar c u d$ systems at $m_{\pi}\simeq 220$ MeV by incorporating both short- and long-range interactions. Using the interaction constrained by the lattice results, we predict a spectrum of isoscalar $B^{(*)}\bar D{}^{(*)}$ molecular states with quantum numbers $J^{P}=0^+$, $1^+$, and $2^+$. The predicted $J^P=0^+$ and $1^+$ $B\bar D$ and $B^*\bar D$ bound states are consistent with the lattice data. Moreover, the two resonances reported by the lattice collaboration in the $J^P=0^+$ and $1^+$ $\bar b \bar c u d$ channels are naturally interpreted as the $B^*\bar D{}^{*}$ and $B\bar D{}^{*}$ hadronic molecules, respectively. We further predict two previously unreported $B^*\bar D{}^{*}$ states with quantum numbers $J^P=1^+$ and $2^+$, corresponding to a bound state and a virtual state, respectively. Our results provide a unified interpretation of the lattice spectrum and highlight the important interplay between short- and long-range interactions in the dynamics of the $B^{(*)}\bar D{}^{(*)}$ systems.
    
    Ponente: Pan-Pan Shi (IFIC)
    
    BDbar_Shi.pdf
- 16:30 → 17:00
  
  Coffee Break 30m
- 17:00 → 18:00
  Session 1: Thursday afternoon: Session 1B
  - 17:00
    
    Hyperon non-leptonic decays in relativistic ChPT with resonances 25m
    
    The non-leptonic decays of hyperons constitute a longstanding theoretical problem. Motivated by recent measurements from the BESIII collaboration, we study these processes in Chiral Perturbation Theory in new Ref. [2604.00646]. We perform the first relativistic calculation of such decays and include the decuplet as an explicit degree of freedom. Moreover, the contributions from the $1/2^−$ and the $1/2^+$ resonance octets are incorporated at tree level. The unknown low-energy constants are fitted to the decay amplitudes. A good simultaneous fit of the s- and p-wave amplitudes is obtained with the caveat of not being very tightly constrained. The role of the resonances is found to be crucial, and consequences for further investigations are discussed.
    
    Ponente: Fernando Alvarado (RUB)
    
    pres.pdf
  - 17:30
    
    Revealing the puzzle of the dynamical nature of two 𝑫_𝟎^∗ states from an analysis of LQCD results 25m
    
    We perform an analysis of LQCD light - charmed (pseudoscalar) meson scattering data with UChPT for pion masses ranging from $m_\pi\simeq 230$~MeV till the SU(3) limit, $m_\pi\simeq 700$~MeV. We find two poles in the non-strange isospin $I=1/2$ sector that can be related to the experimental $D_0(2300)$ resonance. At the physical pion mass, the poles are located at $\sqrt{s_0}=2094(7)(1)-i111(7)(13)$ MeV, and $2463(60)(30)-i108(14)(12)$~MeV. While the first pole, named here $D_0^*(2100)$, is always a resonance in $D\pi$ within the $1\sigma$ region, the second pole can be a resonance or virtual state close to the $D\eta, D_s\bar{K}$ thresholds. For the first time, the pion mass dependence on different chiral trajectories including SU(3) LQCD data are investigated for these poles. We find that in the $m_s=m_{s,\mathrm{phy}}$ trajectory, the $D_0^*(2100)$ resonance pole behaves similarly as the $\sigma$ resonance in $\pi\pi$ scattering, splitting into two poles, connected to the $\bar{\mathbf{3}}$ representation. Moreover, we found that the higher pole related to the experimental $D_0^*(2300)$ can be related to the $\mathbf{6}$ representation. We highlight that since this pole couples strongly to channels with hidden strangeness, it mass is fairly constant in the $\mathrm{Tr}[M]=C$ trajectory, what can be tested in future LQCD simulations. The compositeness of the $D_0^*(2100)$ state at the SU(3) limit is evaluated. Finally, other sectors are also discussed.
    
    Ponente: Zejian Zhuang (University of Valencia)
    
    D2300_UV.pdf
viernes, 4 septiembre
- 8:45 → 10:30
  Session 2: Friday morning: Session 2A
  - 9:30
    
    Effective field theory and hadronic molecules 25m
    
    Effective field theories are generic low energy expansions of physical processes for which a more fundamental, higher energy description is unknown or unsolvable. They rely on theoretical ingredients such as symmetry and renormalization group analysis. In this talk I discuss a few use cases of effective field theory for hadronic molecules, where QCD is not analytically solvable owing to asymptotic freedom, and the relation of this type of formulation with phenomenological approaches.
    
    Ponente: Manuel Pavon Valderrama
    
    Pavon-EFT.pdf
  - 10:00
    
    Correlation Functions for Coupled $K \Lambda$ Interaction and $N(1535)$ Resonance 25m
    
    The $K \Lambda$ interactions in coupled channels are investigate around the energy region of $N(1535)$ resonance through femtoscopic correlation functions within the Koonin-Pratt formalism, by means of which the $N(1535)$ resonance can be dynamically generated in the chiral unitary approach. Two-body scattering amplitudes are calculated using the chiral unitary approach, and the corresponding wave functions and correlation functions are obtained. The analysis shows that the $\pi N$ channel becomes important to the $K \Lambda$ correlation function through coupled channel effects, even if its mass threshold is far from the energy region of the $N(1535)$ resonance. It is worthy to mention that, with the picture that the $N(1535)$ is a dynamically generated state, one can get a good reproduction of the experimental data on the $K \Lambda$ correlation function.
    
    Ponente: Prof. Ju-Jun Xie (Institute of Modern Physics, Chinese Academy of Sciences)
    
    KLambda-AND-N(1535) -Valencia-JUJUNXIE-NEW.pdf
- 10:30 → 11:00
  
  Coffe Break 30m
- 11:00 → 12:00
  Session 2: Friday morning: Session 2B
  - 11:00
    
    Femtoscopy as a new venue for nuclear physics: alpha-alpha scattering 25m
    
    We present the first fully theoretical description of the $\alpha$$\alpha$ femtoscopic correlation function, establishing two-particle correlations as a complementary probe of low-energy $\alpha$$\alpha$ dynamics. Our framework incorporates Coulomb-distorted scattering states, Bose symmetrization, decay feed-down, higher partial waves, finite-range corrections, experimental momentum resolution, and source-size effects within the Koonin--Pratt formalism. We compare predictions from several competing descriptions of the $\alpha$$\alpha$ interaction and show that, despite the limited precision of the available decades-old measurements, the existing data already exhibit sensitivity to competing interaction models and to short-distance finite-range effects. Future high-precision measurements will enable quantitative constraints on the low-energy $\alpha$$\alpha$ interaction, establishing $\alpha$$\alpha$ femtoscopy as an independent benchmark for microscopic nuclear-interaction models with implications for stellar nucleosynthesis.
    
    Ponente: Amador Garcia Lorenzo (IFIC)
    
    ETHNP_Amador.pdf
  - 11:30
    
    Nucleon tomography through the study of exclusive processes 25m
    
    Hard exclusive processes in lepton-hadron and hadron-hadron collisions provide, through their sensitivity to generalised parton distributions (GPDs), information on the 3D distribution of quarks and gluons inside the nucleon, as a function of their longitudinal momentum fraction and transverse position. These concepts will be discussed and a brief overview of existing and planned measurements will be given. Here, the complementarity between different physics channels and collision systems will be highlighted.
    
    Ponente: Charlotte Van Hulse
    
    ETHNP2026.pdf
- 12:00 → 14:00
  
  Lunch time 2h
- 14:45 → 16:30
  Session 3: Friday afternoon: Session 3A
  - 15:00
    
    Effective range expansion with left-hand cut 25m
    
    I will talk about a generalization of effctive range expansion with a left-hand cut due to the t- or u-channel exchange of a particle with a small finit mass. The generalization is constructed using the N/D method of dispersion theory and has a Pade-like form. The applicability will be shown by extracting the NNpi coupling from NN scattering phase shifts using this formalism.
    
    Ponente: Prof. Feng-Kun Guo (ITP, CAS)
    
    ERElhc_ETHNP_FKGuo.pdf
  - 15:30
    
    Three-body effects in excited hadrons 25m
    
    Many excited mesons decay to three hadrons. Some of them are not even resonances but kinematic enhancements from three particles being on-shell in a triangle configuration. Other systems are dynamically generated from three-body interactions leading to resonance poles. Examples for these phenomena from phenomenology and lattice QCD is presented involving the $K(1460)$, $\pi(1300)$, $a_1(1420)$, and non-resonant three-pion systems.
    
    Ponente: Michael Doering (George Washington University)
    
    ETHNP_Valencia_2026.pdf
  - 16:00
    
    Determination of the Roper resonance with two- and three-body unitarity 25m
    
    Determination of the Roper resonance with two- and three-body unitarity
    
    Ponente: Jinzi Wu (The George Washington University)
    
    Roper resoannce in the two and three body unitary amplitude.pdf
- 16:30 → 17:00
  
  Coffe Break 30m
- 17:00 → 18:00
  Session 3: Friday afternoon: Session 3B
  - 17:00
    
    Pion scattering in finite volume within the Inverse Amplitude Method 25m
    
    We study the effect of a finite volume for pion-pion scattering over energy levels and physical observables such as the phase-shift or pion mass. The method to determine the energy levels is done using a finite set of Crystal harmonics or the matrices which represents the Irreps properly, which expands our Inverse Amplitude Method, over a set of irreducible groups of rotations from the octahedral or little group, giving us a forward classification of energy levels.
    
    Ponentes: Sr. Julian Sanchez (IFIC), Dr. Raquel Molina (IFIC)
    
    Volume and Exponential dependencies. Correct treatment of the LHC..pdf
  - 17:30
    
    The 𝐵(∗)̄ 𝐾(∗)-coupled-channel system in the hidden-gauge approach 25m
    
    In this work we provide predictions for bottom-strange molecular states within the Hidden Gauge Formalism. We study the coupled-channel scattering of $B^{(*)}\bar{K}^{(*)}$ states and, by fixing only one free parameter to obtain the mass of a new excited $B_s^0$ state seen by the LHCb, we predict the pole parameters of six states in this sector. Concretely, we get that the masses of the flavor partners of the $D_{s0}(2317)$ and $D_{s1}(2460)$ states in the bottom sector are $5760$ and $5802$ MeV for the $B\bar{K}$ ($J^P=0^+$) and $B^{*}\bar{K}$ ($1^+$) states, respectively. Moreover, the recently seen states by the LHCb with masses around $6100$ and $6160$ MeV can be interpreted as $B\bar{K}^*$ and $B^*\bar{K}^*$ molecular states, according to reasonable values of the pole parameters and the splitting between these two states obtained in our calculation.
    
    Ponente: Jesús Sánchez Illana (IFIC)
    
    BbarK_system.pdf
sábado, 5 septiembre
- 8:45 → 10:30
  Session 4: Saturday morning: Session 4A
  - 9:00
    
    Correlation function for the $n \bar{D}_{s0}^*(2317)$ interaction and the issue of elastic unitarity 25m
    
    We study the interaction between a neutron and the $\bar D_{s0}^*(2317)$ resonance and look at the amplitude below and slightly above the threshold. The $D_{s0}^*(2317)$ resonance is treated as a molecular state of the $DK$ system with isospin $I=0$. The interaction is investigated using the Fixed Center Approximation (FCA) to the Faddeev equations, where the $DK$ molecule is taken as the cluster and the neutron as the external particle. We improve the FCA to implement elastic unitarity around threshold, which is needed to obtain scattering parameters and to evaluate the $n \bar D_{s0}^*(2317)$ correlation function. This presentation is based on our work published in Phys. Rev. D 112, 094019 (2025).
    
    Ponente: Natsumi Ikeno
    
    ETHNP_ikeno.pdf
  - 9:30
    
    interaction and correlation functions of external particles with molecular states 25m
    
    I shall report on the interaction of external particles with molecular states made from the interaction of mesons, evaluating the scattering matrix and the correlation function. In particular I shall discuss the cases:
    $p f_1(1285)$, n $D^*_{s0}(2317)$, $n\,\bar{D}_{s1}(2460)$ and $n\,\bar{D}_{s1}(2536)$, $K f_1(1285)$, $K D_{s0}^*(2317)$, $\pi f_1(1285)$ and $ \eta f_1(1285)$ and $KX(3872)$. In most cases we find a three body bound state, and the correlation functions have similar structures. The recent ALICE experiment on the $p f_1(1285)$ and the agreement with the theoretical predictions, give support to the results obtained for analogous cases and call for an experimental search.
    
    Ponente: Prof. Eulogio Oset (IFIC)
    
    valencia26.pdf
  - 10:00
    
    Finite-Range Effects and Coulomb Interactions in Femtoscopic Correlation Functions 25m
    
    We revisit the description of femtoscopic correlation functions beyond the asymptotic wave-function approximation, quantifying corrections arising from the short-distance structure of the interaction potential and the finite size of the particle-emitting source. We further extend the formalism by cosistently incorporating Coulomb interactions at the short distances relevant for femtoscopy within the Lippmann–Schwinger equation. We introduce a phenomenological parameter that effectively captures the combined impact of finite-source-size effects and the off-shell structure of the interaction, the latter representing one of the main obstacles to extracting detailed information on baryon-meson or, in general, hadron-hadron interactions from femtoscopic measurements in a model-independent way.
    
    Ponente: Pablo Encarnación (Universidad de Valencia, IFIC)
    
    Presentacion_ETHNP_Encarnacion.pdf
- 10:30 → 11:00
  
  Coffe Break 30m
- 11:00 → 12:00
  Session 4: Saturday morning: Session 4B
  - 11:00
    
    Hadron and Charm Physics in São Paulo: A Panoramic Perspective 25m
    
    This talk presents an overview of hadron physics research being carried out in São Paulo, focusing closely on the work of the group at the Federal and State University of São Paulo. We review the group's systematic application of unitarized effective field theories, three-body dynamics, and QCD sum rules to decode the non-perturbative regime. We discuss how these phenomenological results offer critical benchmarks for Lattice QCD data and, crucially, serve to motivate new experimental studies at global facilities.
    
    Ponente: Prof. Kanchan Khemchandani
    
    ETHNP.pdf
  - 11:30
    
    On the possible existence of a S=−3,I=1 pentaquark 25m
    
    In this exploratory work we analyze the possible existence of a strangeness $S=-3$, isospin $I=1$ pentaquark state $P_{sss}$ generated dynamically from the $\bar{K}\Xi$ interaction. We employ a unitarized scheme in coupled channels based on the chiral Lagrangian expanded up to next-to-leading order (NLO), and show that the inclusion of the NLO terms can be crucial to provide the necessary attraction that favors the existence of such triply strange pentaquark. The $\bar{K}\Xi$ femtoscopic correlation functions are calculated as example of a possible experimental measurement in which a direct signal of the $P_{sss}$ state could be observed.
    
    Ponente: Isaac Vidana (Istituto Nazionale di Fisica Nucleare)
    
    Vidana_ETHNP.pdf

ETHNP (Effective Theories in Hadron and Nuclear Physics)

1001-Primera-1-1-1 - Paterna. Seminario

Universe

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