6533b7cefe1ef96bd1257928
RESEARCH PRODUCT
Theoretical interpretation of the Ds+→π+π0η decay and the nature of a0(980)
Ju-jun XieJu-jun XieWei-hong LiangRaquel MolinaRaquel MolinaEulogio OsetEulogio OsetLi-sheng GengLi-sheng Gengsubject
PhysicsNuclear and High Energy Physics010308 nuclear & particles physics0103 physical sciencesHigh Energy Physics::ExperimentRelative phaseAtomic physics010306 general physicsBranching (polymer chemistry)01 natural sciencesNuclear theoryOrder of magnitudedescription
Abstract In a recent paper [1] , the BESIII Collaboration reported the so-called first observation of pure W-annihilation decays D s + → a 0 + ( 980 ) π 0 and D s + → a 0 0 ( 980 ) π + . The measured absolute branching fractions are, however, puzzlingly larger than those of other measured pure W-annihilation decays by at least one order of magnitude. In addition, the relative phase between the two decay modes is found to be about 180 degrees. In this letter, we show that all these can be easily understood if the a 0 ( 980 ) is a dynamically generated state from K ¯ K and πη interactions in coupled channels. In such a scenario, the D s + decay proceeds via internal W emission instead of W-annihilation, which has a larger decay rate than W-annihilation. The proposed decay mechanism and the molecular nature of the a 0 ( 980 ) also provide a natural explanation to the measured negative interference between the two decay modes.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-04-01 | Physics Letters B |