Possible signatures for tetraquarks from the decays of a0(980) , a0(1450)

Kim, K. S. (School of Liberal Arts and Science, Korea Aerospace University, 0000 0000 9881 3149, 412-791, Goyang, Korea) ; Kim, Hungchong (Research Institute of Basic Science, Korea Aerospace University, 0000 0000 9881 3149, 412-791, Goyang, Korea)

01 July 2017

Abstract: Based on the recent proposal for the tetraquarks with the mixing scheme, we investigate fall-apart decays of a0(980),a0(1450) into two lowest-lying mesons. This mixing scheme suggests that a0(980) and a0(1450) are the tetraquarks with the mixtures of two spin configurations of diquark and antidiquark. Due to the relative sign differences in the mixtures, the couplings of fall-apart decays into two mesons are strongly enhanced for a0(980) but suppressed for a0(1450) . We report that this expectation is supported by their experimental decays. In particular, the ratios of the associated partial decay widths, which depend on some kinematical factors and the couplings, are found to be around Γ[a0(980)→πη]/Γ[a0(1450)→πη]=2.51-2.54 , Γ[a0(980)→KK¯]/Γ[a0(1450)→KK¯]=0.52-0.89 , which seems to agree with the experimental ratios reasonably well. This agreement can be interpreted as the tetraquark signatures for a0(980),a0(1450) .


Published in: EPJC 77 (2017) 435
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-017-5020-5
License: CC-BY-3.0



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