Measurement of the Lambda(1405) and other strange things in p+p collisions

por Laura Fabbietti (Technische Universität München)

martes 20 abr. 2010 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

Although the Lambda(1405) resonance is known for several years, its structure is still a topic of investigation. A detailed study of the line shape of this resonance requires a variety of measured reactions with high statistic, as the line shape of the Lambda(1405) turns out to be not compatible with any standard form of resonances. The state of the art is to treat this resonance in a coupled channels approach, describing it as a molecular state of a meson and a baryon. To verify these complex theories, new experimental data arerequired. We have recentlz analyzed a p+p run at 3.5 GeV, measured with the High Acceptance Di- Electron Spectrometer (HADES). The Lambda(1405) could be reconstructed in all its three decay channels Sigma+pi-, Sigma-pi+ and Sigma0pi0. The three different line shapes can be compared to each other in order to investigate the dependence of the line shape on the production and decay mechanism.