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 MARTINEZ TORRES
Amador Garcia Lorenzo
Bhoomika Pandya
Bárbara Cid-Mora
Elena Santopinto
Eulogio Oset
Feng-Kun Guo
Isaac Vidaña
Jesús Sánchez Illana
Jing Song
Jinzi Wu
Ju-Jun Xie
Juan M Nieves
Julian Andrés Sánchez Muñoz
Li-Sheng Geng
Luis Alvarez Ruso
Manuel Pavon Valderrama
Manuel Vicente
Marta Sayago Rodríguez
Michael Doering
Miguel Albaladejo
Mikel Fernández Barbat
Natsumi Ikeno
Pablo Encarnación
Pan-Pan Shi
Raquel Molina Peralta
Wen-Tao Lyu
Zejian Zhuang

Contact

Miguel.Albaladejo@ific.uv.es

Raquel.Molina@ific.uv.es

jueves, 3 septiembre
- 13:45 → 15:30
  Thursday afternoon (Session 1): Thursday afternoon (Session 1A)
  - 13:45
    
    Welcome and introduction 15m
  - 14:00
    
    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)
- 15:30 → 16:00
  
  Coffee Break 30m
- 16:00 → 18:00
  Thursday afternoon (Session 1): 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)
  - 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)
viernes, 4 septiembre
- 9:00 → 12:00
  Friday morning (Session 2): Session 2A
  - 9:30
    
    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)
  - 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)
- 10:30 → 11:00
  
  Coffe Break 30m
- 11:00 → 12:00
  
  Friday morning (Session 2): Session 2B
- 12:00 → 14:00
  
  Lunch 2h
- 14:00 → 15:30
  
  Friday afternoon (Session 3): Session 3A
- 15:30 → 16:00
  
  Coffe Break 30m
- 16:00 → 18:00
  
  Friday afternoon (Session 3): Session 3B
sábado, 5 septiembre
- 9:00 → 10:30
  
  Saturday morning (Session 4): Session 3A
- 10:30 → 11:00
  
  Coffe Break 30m
- 11:00 → 12:00
  
  Saturday morning (Session 4): Session 3B

ETHNP (Effective Theories in Hadron and Nuclear Physics)

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

Universe

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