2017/03/29 by Jonathan M. M. Hall, Hall, Jonathan M. M., Waseem Kamleh +9
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications
paper · pdf · doi:10.48550/arxiv.1703.09895
openalex publication_date 2017/03/29 · openalex created_date 2022/08/09 · openalex updated_date 2026/07/28
The light-quark sector of the Lambda(1405) baryon is examined in the context\nof the recent discovery of a dominant antikaon-nucleon composition at low quark\nmasses. Further evidence for this interpretation of the Lambda(1405) is\npresented, by calculating the u and d quark contributions to the Lambda(1405)\nmagnetic form factors in lattice QCD. The extent to which these quantities are\nconsistent with the exotic molecular description can then be quantified by\ncomparing the results with the equivalent nucleon form factors. Drawing on a\nrecent extension of the graded-symmetry approach for the flavor-singlet\ncomponents of the Lambda(1405), the separation of the connected and\ndisconnected contributions is performed in both the flavor-octet and singlet\nrepresentations. In both cases, the disconnected loop contributions are found\nto be unexpectedly large. The relationship between the light-quark\ncontributions to the Lambda(1405) magnetic form factor and the connected\ncontributions of the nucleon magnetic form factors is thus confirmed in the\ncase of lattice QCD, establishing compelling evidence for a KN molecular\nstructure of the Lambda(1405) near the physical point.\n