### Speaker

Raquel Molina
(The George Washington University, Washington)

### Description

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 the finite volume [3]. The UχPT calculation predicts the quark mass dependence remarkably well. It also explains the overlap pattern with diﬀerent meson-baryon components, mainly πΣ and K-bar N, at different quark masses. Some of the results of our calculation are shown in Fig. 1. We will study the properties of the two lower states in the box as predicted by UχPT and compare to those of the two poles of the Λ(1405) in the infinite limit. More accurate Lattice QCD are required to draw definite conclusions on the nature of the Λ(1405).
References
[1] J. M. M. Hall, W. Kamleh, D. B. Leinweber, B. J. Menadue, B. J. Owen, A. W. Thomas and R. D. Young, Phys. Rev. Lett. 114, no. 13, 132002 (2015)
[2] E. Oset, A. Ramos and C. Bennhold, Phys. Lett. B 527, 99 (2002) [Phys. Lett. B 530, 260 (2002)]
[3] M. Doring, J. Haidenbauer, U. G. Meissner and A. Rusetsky, Eur. Phys. J. A 47, 163 (2011)

### Primary authors

Prof.
Michael Doering
(The George Washington University)
Raquel Molina
(The George Washington University, Washington)