### Conveners

#### Parallel Session 6 - Hadron Structure & Meson-Baryon Interaction WG

- Martin Hoferichter (TU Darmstadt)
- Andre Walker-Loud (College of William and Mary)
- Patricia Solvignon (University of New Hampshire)

Waseem Kamleh
(University of Adelaide)

7/2/15, 4:20 PM

Hadron Structure and Meson-Baryon Interaction Working Group

Talk

We present lattice QCD results showing that the strange magnetic form factor of the Lambda(1405) vanishes, signaling the formation of an antikaon–nucleon. Together with a Hamiltonian effective-field-theory model analysis of the lattice QCD energy levels, this strongly suggests that the structure is dominated by a bound antikaon-nucleon component. This result clarifies that not all states...

Maxim Mai
(HISKP, University of Bonn)

7/2/15, 4:50 PM

Hadron Structure and Meson-Baryon Interaction Working Group

Talk

A chiral unitary approach for antikaon-nucleon scattering in on-shell factorization is studied. We find multiple sets of parameters for which the model describes all existing hadronic data similarly well. We confirm the two-pole structure of the Λ(1405). The narrow Λ(1405) pole appears at comparable positions in the complex energy plane, whereas the location of the broad pole suffers from a...

Albert Feijoo
(University of Barcelona)

7/2/15, 5:10 PM

Hadron Structure and Meson-Baryon Interaction Working Group

Talk

The meson-baryon interaction in the S=-1 sector is studied by means of a chiral SU(3) Lagrangian up to next-to-leading order, implementing unitarization in coupled channels. The parameters of the Lagrangian have been fitted to a large set of experimental data in two-body channels. We focused on K- p --> K Cascade reactions because they show the strongest sensitivity to the next-to-leading...

Raquel Molina
(The George Washington University, Washington)

7/2/15, 5:30 PM

Hadron Structure and Meson-Baryon Interaction Working Group

Talk

The Λ(1405) baryon is of continued interest in hadronic physics, being absent in many quark model calculations and supposedly manifesting itself in a two-pole structure. Finite- volume Lattice-QCD eigenvalues for different quark masses were recently reported by the Adelaide group [1]. We compare these eigenvalues to those of a unitary Chiral Perturbation Theory (UχPT) model [2], evaluated in...

Parikshit Junnarkar
(Helmholtz Institut, Mainz)

7/2/15, 5:50 PM

Hadron Structure and Meson-Baryon Interaction Working Group

Talk

We present preliminary results from a lattice QCD calculation of the H-dibaryon using two flavors ofO(a) improved Wilson fermions. We employ six quark interpolating operators with the appropriate quantum numbers of the H-dibaryon and also explore its couplings to two-baryon channels. We apply two smearings to improve the overlap to the ground state, which is obtained by solving a generalised...