Production and decay of $\eta^{\prime}(958)$ and $\eta (1440)$ in $\bar p p$ annihilation at rest
Amsler, C. ; Anisovich, A. V. ; Baker, C. A. ; Barnett, B. M. ; Batty, C. J. ; Blüm, P. ; Braune, K. ; Credé, V. ; Crowe, K. M. ; Doser, M. ; Dünnweber, W. ; Engelhardt, D. ; Faessler, M. A. ; Haddock, R. P. ; Heinsius, F. H. ; Hessey, N. P. ; Kalinowsky, H. ; Jamnik, D. ; Kammel, P. ; Kisiel, J. ; Klempt, E. ; Koch, H. ; Kunze, M. ; Kurilla, U. ; Landua, R.
Springer
Published 2004
Springer
Published 2004
| ISSN: |
1434-6052
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Physics
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| Notes: |
Abstract. We report on a study of four reactions in $\bar{\mathrm p}{\mathrm p}$ annihilation at rest, of $\bar{\mathrm p}{\mathrm p} \rightarrow 2\pi^ + 2\pi^-\eta$ , $\bar{\mathrm p}{\mathrm p} \rightarrow 2\pi^ + 2\pi^- 2\pi^0$ , $\bar{\mathrm p}{\mathrm p} \rightarrow 2\pi^ + 2\pi^-\gamma$ and $\bar{\mathrm p}{\mathrm p}\rightarrow 4\pi^0\eta$ . The $\eta'$ and the $\eta$ (1440) are seen in their decays into $\pi^ + \pi^-\eta$ , $\pi^0\pi^0\eta$ and $\pi^ + \pi^-\gamma$ ; no signal is seen in the $4\pi$ invariant mass distribution. Branching ratios for $\eta'$ and $\eta$ (1440) production and decay into the different channels are determined. In particular we derive the ratio $\Gamma_{\eta (1440)\rightarrow\pi^ + \pi^-\gamma}/ \Gamma_{\eta (1440)\rightarrow\pi^ + \pi^-\eta} = 0.111\pm 0.064$ .
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| Type of Medium: |
Electronic Resource
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| URL: |