Darmstadt 2016 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 64: Hadron Structure and Spectroscopy XI
HK 64.1: Group Report
Friday, March 18, 2016, 14:00–14:30, S1/01 A5
Status of d*(2380) and Search for an Isospin I = 3 Dibaryon Resonance*. — •Heinz Clement1, Mikhail Bashkanov2, and Tatiana Skorodko1 for the WASA-at-COSY collaboration — 1Physikalisches Institut der Universität Tübingen — 2School of Physics and Astronomy, University of Edinburgh, UK
For the meanwhile established dibaryon resonance d*(2380) with I(JP) = 0(3+) all decay branchings into NN and NNππ channels have been determined. A principially possible, though unlikely decay into the isoscalar NNπ channel is under investigation – see separate contribution. The total decay width as well as the extracted branching ratios bear important information about the internal structure of the dibaryon. They agree with a subthreshold ΔΔ system as asymtotic two-hadron configuration in the intermediate state and discriminate against other recently discussed decay scenarios like, e.g. via the NΔ threshold state D12(2144).
The experimental results are compared with various theoretical calculations in the framework of Faddeev or quark model treatments. The possible role of hidden color is discussed.
Many of 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 on the pp → ppπ+π+π−π− reaction will be reported.
*supported by DFG (CL 214/3-1) and STFC (ST/L00478X/1)