Observation of the Resonant Character of theZ(4430)−State

2014/04/07 by LHCb collaboration, R. Aaij, B. Adeva +704 · 1 voice · 3 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1103/physrevlett.112.222002

published as Phys. Rev. Lett. 112, 222002 (2014) · 10 pages, 4 figures

arxiv created 2014/04/07 · openalex publication_date 2014/06/04 · arxiv updated 2014/06/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

Resonant structures in B⁰→ψ^'π^-K⁺ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3 fb^-1 collected with the LHCb detector. The data cannot be described with K⁺π^- resonances alone, which is confirmed with a model-independent approach. A highly significant Z(4430)^-→ψ^'π^- component is required, thus confirming the existence of this state. The observed evolution of the Z(4430)^- amplitude with the ψ^'π^- mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin parity is determined unambiguously to be 1⁺.

Citations

• Review of Particle Physics
• Understanding the Charged Meson Z(4430)
• Microscopic calculation of the decay of Jaffe-Wilczek tetraquarks, and the Z(4433)
• Partners ofZ(4430)and productions inBdecays
• A chiral quark model study of Z⁺(4430) in the molecular picture
• Search for theZ(4430)−atBABAR
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• A schematic model of baryons and mesons

Cited by

• Z(4430)and a new paradigm for spin interactions in tetraquarks
• Hadron [wikipedia]
• Quark [wikipedia]

Discussions

• Observation of the resonant character of the Z(4430)− state [hn, 1 points, 0 comments]