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Coupled Channel Analysis of $ar{p} p
ightarrow pi^0 pi^0 eta$, $pi^0 eta eta$ and $K^+ K^- pi^0$ at 900 $MeV/c$ and of $pipi$-Scattering Data | | M. Albrecht
; C. Amsler
; W. Dünnweber
; M.A. Faessler
; F.H. Heinsius
; H. Koch
; B. Kopf
; U. Kurilla
; C.A. Meyer
; K. Peters
; J. Pychy
; X. Qin
; M. Steinke
; U. Wiedner
; | | Date: |
16 Sep 2019 | | Abstract: | A partial wave analysis of antiproton-proton annihilation data in flight at
900 $MeV/c$ into $pi^0 pi^0 eta$ , $pi^0 eta eta$ and $K^+ K^- pi^0$ is
presented. The data were taken at LEAR by the Crystal Barrel experiment in
1996. The three channels have been coupled together with $pipi$-scattering
isospin I=0 S- and D-wave as well as I=1 P-wave data utilizing the K-matrix
approach. Analyticity is treated using Chew-Mandelstam functions, also for
unstable decay products. In the fit all ingredients of the K-matrix, including
resonance masses and widths, were treated as free parameters. In spite of the
large number of parameters, the fit results are in the ballpark of the values
listed in PDG. In the channel $pi^0 pi^0 eta$ a significant contribution of
the spin exotic $I^G=1^-$ $J^{PC}=1^{-+}$ wave with a coupling to $pi^0 eta$
is observed. Furthermore the contributions of $phi(1020) pi^0$ and
$K^*(892)^pm K^mp$ in the channel $K^+ K^- pi^0$ have been studied in
detail. The differential production cross section for the two reactions and the
spin-density-matrix elements for the $phi(1020)$ and $K^*(892)^pm$ have been
extracted. No spin-alignment is observed for both vector mesons. The spin
density matrix elements have been also determined for the spin exotic wave. | | Source: | arXiv, 1909.7091 | | Services: | Forum | Review | PDF | Favorites | |
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