Coupled channel analysis of p<overbar></mml:mover>p<mml:mspace width="0.166667em"></mml:mspace>→<mml:mspace width="0.166667em"></mml:mspace><mml:msup>π0</mml:msup><mml:msup>π0</mml:msup>η, <mml:msup>π0</mml:msup>ηη and <mml:msup>K+</mml:msup><mml:msup>K<mml:mo>-</mml:msup><mml:msup>π0</mml:msup> at 900 MeV/c and of ππ-scattering data: The Crystal Barrel Collaboration

被引：0

作者：

Albrecht, M. ^{[1
]}

Amsler, C. ^{[4
,5
]}

Duennweber, W. ^{[3
]}

Faessler, M. A. ^{[3
]}

Heinsius, F. H. ^{[1
]}

Koch, H. ^{[1
]}

Kopf, B. ^{[1
]}

Kurilla, U. ^{[1
,6
]}

Meyer, C. A. ^{[2
]}

Peters, K. ^{[1
,6
]}

Pychy, J. ^{[1
]}

Qin, X. ^{[1
]}

Steinke, M. ^{[1
]}

Wiedner, U. ^{[1
]}

机构：

[1] Ruhr Univ Bochum, D-44801 Bochum, Germany

[2] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[3] Ludwig Maximilians Univ Munchen, D-80799 Munich, Germany

[4] Univ Zurich, Phys Inst, CH-8057 Zurich, Switzerland

[5] Austrian Acad Sci Vienna, Stefan Meyer Inst, A-1090 Vienna, Austria

[6] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

来源：

EUROPEAN PHYSICAL JOURNAL C | 2020年 / 80卷 / 05期

关键词：

PARTIAL-WAVE ANALYSIS; MASS REGION; ANNIHILATION; RESONANCES; REST; PI(0)PI(0)PI(0); (P)OVER-BARP; ENERGY;

D O I：

10.1140/epjc/s10052-020-7930-x

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

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 IG=1-JPC=1-+pi 1-wave with a coupling to pi 0 eta is observed. Furthermore the contributions of phi (1020)pi 0 and K(892)+/- K -/+ 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)+/- 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.

引用

页数：21

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