dc.contributor.author | Belle Collaboration | |
dc.contributor.author | Schnell, Gunar | |
dc.date.accessioned | 2020-08-07T08:35:00Z | |
dc.date.available | 2020-08-07T08:35:00Z | |
dc.date.issued | 2020-07-06 | |
dc.identifier.citation | Physical Review D 102 : (2020) // Article ID 012002 | es_ES |
dc.identifier.issn | 1550-7998 | |
dc.identifier.uri | http://hdl.handle.net/10810/45909 | |
dc.description.abstract | [EN] We present the results of the first Dalitz plot analysis of the decay D0 → K−πþη. The analysis is
performed on a data set corresponding to an integrated luminosity of 953 fb−1 collected by the Belle
detector at the asymmetric-energy eþe− KEKB collider. The Dalitz plot is well described by a combination
of the six resonant decay channels K¯ ð892Þ0η, K−a0
ð980Þþ, K−a2
ð1320Þþ, K¯ ð1410Þ0η, K ð1680Þ−πþ
and K
2
ð1980Þ−πþ, together with Kπ and Kη S-wave components. The decays K ð1680Þ− → K−η and
K
2
ð1980Þ− → K−η are observed for the first time. We measure ratio of the branching fractions,
BðD0→K−πþηÞ
BðD0→K−πþÞ
¼ 0.500 0.002ðstatÞ 0.020ðsystÞ 0.003ðBPDGÞ. Using the Dalitz fit result, the ratio
BðK ð1680Þ→KηÞ
BðK ð1680Þ→KπÞ is measured to be 0.11 0.02ðstatÞþ0.06
−0.04
ðsystÞ 0.04ðBPDGÞ; this is much lower than the
theoretical expectations (≈1) made under the assumption that K ð1680Þ is a pure 13D1 state. The product
branching fraction BðD0 → ½K
2
ð1980Þ− → K−η πþÞ ¼ ð2.2
þ1.7
−1.9
Þ × 10−4 is determined. In addition, the πη0
contribution to the a0
ð980Þ resonance shape is confirmed with 10.1σ statistical significance using the
three-channel Flatte´ model.We also measure BðD0 → K¯ ð892Þ0ηÞ ¼ ð1.41
þ0.13
−0.12
Þ%. This is consistent with,
and more precise than, the current world average ð1.02 0.30Þ%, deviates with a significance of more than
3σ from the theoretical predictions of (0.51–0.92)%. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | American Physical Society | es_ES |
dc.rights | info:eu-repo/semantics/openAccess | es_ES |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | * |
dc.title | Dalitz analysis of D0 → K− π+ η decays at Belle | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.holder | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. | es_ES |
dc.relation.publisherversion | https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.012002 | es_ES |
dc.identifier.doi | 10.1103/PhysRevD.102.012002 | |
dc.departamentoes | Física teórica e historia de la ciencia | es_ES |
dc.departamentoeu | Fisika teorikoa eta zientziaren historia | es_ES |