Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Hadron Structure and Spectroscopy IV
HK 22.7: Vortrag
Dienstag, 27. Februar 2018, 18:15–18:30, HZO 50
D21 — Evidence for Yet Another Dibaryon Resonance ?*. — •Tatiana Skorodko1, Mikhail Bashkanov2, and Heinz Clement1 for the WASA-at-COSY collaboration — 1Physikalisches Institut der Universität Tübingen — 2School of Physics and Astronomy, University of Edinburgh, UK
Exclusive measurements of the quasi-free pp → ppπ+π− reaction have been performed by means of pd collisions at Tp = 1.2 GeV using the WASA detector setup at COSY. Total and differential cross sections have been obtained covering the energy region Tp = 1.08 − 1.36 GeV (√s = 2.35 - 2.46 GeV), which includes the regions of N*(1440) and Δ(1232)Δ(1232) resonance excitations. Calculations describing these excitations by t-channel meson exchange are at variance with experimental differential cross sections and underpredict substantially the measured total cross section. An isotensor Δ N dibaryon resonance with I(JP) = 2(1+) produced associatedly with a pion is able to overcome these deficiences. It corresponds to the state D21 predicted by Dyson and Xuong and later-on by Gal and Garcilazo.
*supported by DFG (CL 214/3-1 and 3-2) and STFC (ST/L00478X/1)