Header

UZH-Logo

Maintenance Infos

Observation of the resonant character of the $Z(4430)^-$ state


LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2014). Observation of the resonant character of the $Z(4430)^-$ state. Physical Review Letters, 112(222002):online.

Abstract

Resonant structures in $B^0\to\psi'\pi^-K^+$ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using $pp$ collision data corresponding to $\rm 3 fb^{-1}$ collected with the LHCb detector. The data cannot be described with $K^+\pi^-$ resonances alone, which is confirmed with a model-independent approach. A highly significant $Z(4430)^-\to\psi'\pi^-$ component is required, thus confirming the existence of this state. The observed evolution of the $Z(4430)^-$ amplitude with the $\psi'\pi^-$ mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin-parity is determined unambiguously to be $1^+$.

Abstract

Resonant structures in $B^0\to\psi'\pi^-K^+$ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using $pp$ collision data corresponding to $\rm 3 fb^{-1}$ collected with the LHCb detector. The data cannot be described with $K^+\pi^-$ resonances alone, which is confirmed with a model-independent approach. A highly significant $Z(4430)^-\to\psi'\pi^-$ component is required, thus confirming the existence of this state. The observed evolution of the $Z(4430)^-$ amplitude with the $\psi'\pi^-$ mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin-parity is determined unambiguously to be $1^+$.

Statistics

Citations

Dimensions.ai Metrics
144 citations in Web of Science®
158 citations in Scopus®
361 citations in Microsoft Academic
Google Scholar™

Altmetrics

Downloads

16 downloads since deposited on 24 Feb 2015
5 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:24 Feb 2015 14:06
Last Modified:14 Feb 2018 23:16
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1103/PhysRevLett.112.222002

Download

Download PDF  'Observation of the resonant character of the $Z(4430)^-$ state'.
Preview
Content: Accepted Version
Filetype: PDF
Size: 662kB
View at publisher