1. General Seminars

On nuclear states of mesons

by Slawomir Wojciech Wycech (National Centre for Nuclear Studies, Warsaw, Poland)

Europe/Rome
Aula Leale (Laboratori Nazionali di Frascati)

Aula Leale

Laboratori Nazionali di Frascati

Description
The existence of nuclear states of $\bar K$ mesons and $\eta$ mesons has been expected for about thirty years. The physical interest of this field is related to a new mechanism of nuclear binding generated by excitations of the internal nucleon structure. Despite being short lived such states might offer a new and interesting nuclear spectroscopy. Despite long and extensive experimental search, the existence and properties of such states are still elusive. Some similarities and related questions of the $\eta$ and $\bar K$ cases will be shown. Possible origin of the experimental difficulties related to weak production rate and large widths of such states will be discussed. I will try to indicate usefulness of the recent AMADEUS/KLOE measurements.
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