The 8th International Workshop on Chiral Dynamics 2015

Session

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

2 Jul 2015, 16:20

Building E, Polo Fibonacci (Pisa)

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)

20. *Leading Talk* Evidence that the Lambda(1405) is a molecular antikaon-nucleon bound state.

Waseem Kamleh (University of Adelaide)

02/07/2015, 16:20

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...

106. Constraints on the chiral unitary KN amplitude from πΣK photoproduction data

Maxim Mai (HISKP, University of Bonn)

02/07/2015, 16:50

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...

70. The K Cascade production in coupled channel chiral models up to next-to-leading order.

Albert Feijoo (University of Barcelona)

02/07/2015, 17:10

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...

80. Evolution of the K-bar N - pi Sigma system with M^2_pi in a box from UχPT

Raquel Molina (The George Washington University, Washington)

02/07/2015, 17:30

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...

56. The H-dibaryon in two flavor lattice QCD

Parikshit Junnarkar (Helmholtz Institut, Mainz)

02/07/2015, 17:50

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...