Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 67: Hadron Structure and Spectroscopy 12
HK 67.1: Gruppenbericht
Donnerstag, 26. März 2015, 17:00–17:30, T/SR25
Status of d*(2380) and Search for further Dibaryon Resonances*. — •Mikhail Bashkanov for the WASA-at-COSY collaboration — Physikalisches Institut der Universität Tübingen
After evidence for the existence of a narrow dibaryon resonance with I(JP) = 0(3+) had been found in various np-induced two-pion production channels, its pole has been identified now in polarized n→p scattering. This qualifies the resonance as a genuine s-channel dibaryon resonance, denoted since then by d*(2380) [1]. Meanwhile, also all two-pion decay channels have been studied and decay branchings deduced.
Several new theoretical investigations in the framework of Faddeev or quark model treatments see this state at a mass close to the experimentally observed one – and partly also with the right width. Amazingly, the first prediction by Dyson and Xuong based on SU(6) symmetry breaking turns out to have been already very close.
These theoretical studies predict also another truly exotic state with mirrored quantum numbers I(JP) = 3(0+), i.e. decoupled from the NN system and consisting of just six up-quarks in its Iz = +3 state. Such a state may be searched for in four-pion production. The status of this search by use of WASA data will be reported.
[1] P. Adlarson et. al., Phys. Rev. Lett. 112 (2014) 202301 and Phys. Rev. C 90 (2014) 035204
*supported by DFG(CL 214/3-1) and COSY-FFE (FZ Jülich)