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Coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${K^+K^-\pi ^0}$ at 900 MeV/c and of ${\pi \pi }$-scattering data

A partial wave analysis of antiproton–proton annihilation data in flight at 900 $\mathrm {MeV/}c$ 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 wi...

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Autores principales: Albrecht, M., Amsler, C., Dünnweber, W., Faessler, M.A., Heinsius, F.H., Koch, H., Kopf, B., Kurilla, U., Meyer, C.A., Peters, K., Pychy, J., Qin, X., Steinke, M., Wiedner, U.
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:https://dx.doi.org/10.1140/epjc/s10052-020-7930-x
http://cds.cern.ch/record/2722769
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author Albrecht, M.
Amsler, C.
Dünnweber, W.
Faessler, M.A.
Heinsius, F.H.
Koch, H.
Kopf, B.
Kurilla, U.
Meyer, C.A.
Peters, K.
Pychy, J.
Qin, X.
Steinke, M.
Wiedner, U.
author_facet Albrecht, M.
Amsler, C.
Dünnweber, W.
Faessler, M.A.
Heinsius, F.H.
Koch, H.
Kopf, B.
Kurilla, U.
Meyer, C.A.
Peters, K.
Pychy, J.
Qin, X.
Steinke, M.
Wiedner, U.
author_sort Albrecht, M.
collection CERN
description A partial wave analysis of antiproton–proton annihilation data in flight at 900 $\mathrm {MeV/}c$ 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 $\pi \pi $-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. 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 published by the Particle Data Group. In the channel ${\pi ^0\pi ^0\eta }$ a significant contribution of the spin exotic $I^G=1^-J^{PC}=1^{-+}\pi _1$-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.
id cern-2722769
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2019
record_format invenio
spelling cern-27227692022-06-30T11:48:05Zdoi:10.1140/epjc/s10052-020-7930-xhttp://cds.cern.ch/record/2722769engAlbrecht, M.Amsler, C.Dünnweber, W.Faessler, M.A.Heinsius, F.H.Koch, H.Kopf, B.Kurilla, U.Meyer, C.A.Peters, K.Pychy, J.Qin, X.Steinke, M.Wiedner, U.Coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${K^+K^-\pi ^0}$ at 900 MeV/c and of ${\pi \pi }$-scattering datahep-phParticle Physics - Phenomenologyhep-exParticle Physics - ExperimentA partial wave analysis of antiproton–proton annihilation data in flight at 900 $\mathrm {MeV/}c$ 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 $\pi \pi $-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. 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 published by the Particle Data Group. In the channel ${\pi ^0\pi ^0\eta }$ a significant contribution of the spin exotic $I^G=1^-J^{PC}=1^{-+}\pi _1$-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.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 $\pi\pi$-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. 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 published by the Particle Data Group. In the channel $\pi^0 \pi^0 \eta$ a significant contribution of the spin exotic $I^G=1^-$ $J^{PC}=1^{-+}$ $\pi_1$-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.arXiv:1909.07091oai:cds.cern.ch:27227692019-09-16
spellingShingle hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
Albrecht, M.
Amsler, C.
Dünnweber, W.
Faessler, M.A.
Heinsius, F.H.
Koch, H.
Kopf, B.
Kurilla, U.
Meyer, C.A.
Peters, K.
Pychy, J.
Qin, X.
Steinke, M.
Wiedner, U.
Coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${K^+K^-\pi ^0}$ at 900 MeV/c and of ${\pi \pi }$-scattering data
title Coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${K^+K^-\pi ^0}$ at 900 MeV/c and of ${\pi \pi }$-scattering data
title_full Coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${K^+K^-\pi ^0}$ at 900 MeV/c and of ${\pi \pi }$-scattering data
title_fullStr Coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${K^+K^-\pi ^0}$ at 900 MeV/c and of ${\pi \pi }$-scattering data
title_full_unstemmed Coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${K^+K^-\pi ^0}$ at 900 MeV/c and of ${\pi \pi }$-scattering data
title_short Coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${K^+K^-\pi ^0}$ at 900 MeV/c and of ${\pi \pi }$-scattering data
title_sort coupled channel analysis of ${\bar{p}p}\,\rightarrow \,\pi ^0\pi ^0\eta $, ${\pi ^0\eta \eta }$ and ${k^+k^-\pi ^0}$ at 900 mev/c and of ${\pi \pi }$-scattering data
topic hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
url https://dx.doi.org/10.1140/epjc/s10052-020-7930-x
http://cds.cern.ch/record/2722769
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