Details

Autor(en) / Beteiligte

• Hanhart, C
• Kalashnikova, Yu S
• Matuschek, P
• Mizuk, R V
• Nefediev, A V
• Wang, Q

Titel

Practical Parametrization for Line Shapes of Near-Threshold States

Ist Teil von

• Physical review letters, 2015-11, Vol.115 (20), p.202001-202001, Article 202001

Ort / Verlag

United States

Erscheinungsjahr

2015

Quelle

PROLA

Beschreibungen/Notizen

• Numerous quarkonium(like) states lying near S-wave thresholds are observed experimentally. We propose a self-consistent approach to these near-threshold states compatible with unitarity and analyticity. The underlying coupled-channel system includes a bare pole and an arbitrary number of elastic and inelastic channels treated fully nonperturbatively. The resulting analytical parametrization is ideally suited for a combined analysis of the data available in various channels that is exemplified by an excellent overall description of the data for the charged Z(b)(10610) and Z(b)(10650) states.