Journal Article

FZJ-2021-01216

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Insights into Z b ( 10610 ) and Z b ( 10650 ) from dipion transitions from ϒ ( 10860 )

Baru, V. (Corresponding author) ; Epelbaum, E. ; Filin, A. A. ; Hanhart, C.FZJ* ; Mizuk, R. V. ; Nefediev, A. V.FZJ* ; Ropertz, S.

2021
Inst.812068 Melville, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/27652  doi:10.1103/PhysRevD.103.034016

Abstract: The dipion transitions Υ(10860)→π+π−Υ(nS) (n=1, 2, 3) are studied in the framework of a unitary and analytic coupled-channel formalism previously developed for analyzing experimental data on the bottomoniumlike states Zb(10610) and Zb(10650) [Phys. Rev. D 98, 074023 (2018)] and predicting the properties of their spin partners [Phys. Rev. D 99, 094013 (2019)]. In this work we use a relatively simple but realistic version of this approach, where the scattering and production amplitudes are constructed employing only short-ranged interactions between the open- and hidden-flavor channels consistent with the constraints from heavy quark spin symmetry, for an extended analysis of the experimental line shapes. In particular, the transitions from the Υ(10860) to the final states ππhb(mP) (m=1, 2) and πB(*)¯B∗ already studied before, are now augmented by the Υ(10860)→π+π−Υ(nS) final states (n=1, 2, 3). This is achieved by employing dispersion theory to account for the final state interaction of the ππ subsystem including its coupling to the K¯K channel. Fits to the two-dimensional Dalitz plots for the π+π−Υ final states were performed. Two real subtraction constants are adjusted to achieve the best description of the Dalitz plot for each Υ(nS) (n=1, 2, 3) while all the parameters related to the properties of the Zbs are kept fixed from the previous study. A good overall description of the data for all Υ(10860)→π+π−Υ(nS) channels achieved in this work provides additional strong support for the molecular interpretation of the Zb states.

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 511 - Enabling Computational- Data-Intensive Science and Engineering (POF4-511) (POF4-511)
2. DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2021

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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