Preprint/Internal Report DESY-2014-03242

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Observation of a new charged charmonium-like state in $\bar{B}^{0} -> J/\psi K^{-}\pi^{+}$ decays

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2014

14 pp. ()  GO

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Report No.: BELLE-PREPRINT-2014-12; arXiv:1408.6457

Abstract: We present the results of an amplitude analysis of ${\overline{B}}^{0}\to J/\psi {K}^{-}{\pi }^{+}$ decays. A new charged charmoniumlike state ${Z}_{c}\left(4200{\right)}^{+}$ decaying to $J/\psi {\pi }^{+}$ is observed with a significance of $6.2\sigma $. The mass and width of the ${Z}_{c}\left(4200{\right)}^{+}$ are $419{6}_{-29-13}^{+31+17}\text{}\text{}\mathrm{MeV}/{c}^{2}$ and $37{0}_{-70-132}^{+70+70}\text{}\text{}\mathrm{MeV}$, respectively; the preferred assignment of the quantum numbers is ${J}^{P}={1}^{+}$. In addition, we find evidence for ${Z}_{c}\left(4430{\right)}^{+}\to \phantom{\rule{0ex}{0ex}}J/\psi {\pi }^{+}$. The analysis is based on a $711\text{}\text{}{\mathrm{fb}}^{-1}$ data sample collected by the Belle detector at the asymmetric-energy ${e}^{+}{e}^{-}$ collider KEKB.

Keyword(s): mass spectrum: (J/psi(3100) pi+) ; decay: amplitude analysis ; electron positron: annihilation ; quantum number ; BELLE ; KEK-B ; charmonium: hadron spectroscopy ; B: pair production ; anti-B0: hadronic decay ; anti-B0: branching ratio ; new particle ; mass: width ; Dalitz plot ; experimental results ; anti-B0 --> J/psi(3100) K- pi+ ; J/psi(3100) --> lepton+ lepton- ; 10.58 GeV-cms


Note: 14 pages, 12 figures, submitted to PRD on 27.08.2014

Contributing Institute(s):
  1. beauftragt von FH1 (Belle)
Research Program(s):
  1. Experiments at KEK (BELLE I/II) (POF2-515) (POF2-515)
Experiment(s):
  1. KEK: BELLE I/II

Appears in the scientific report 2014
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http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Report/Journal Article  ;  ;  ; et al
Observation of a new charged charmoniumlike state in ${\overline{B}^{0}}\to J/\psi {K}^{-}{\pi }^{+}$ decays
Physical review / D 90(11), 112009 () [10.1103/PhysRevD.90.112009]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS


 Record created 2014-09-02, last modified 2021-11-10


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