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Title	Production and decay of $\eta^\prime$(958) and $\eta$(1440) in $\bar{p} p$ annihilation at rest
Author(s)	Amsler, Claude (U. Zurich (main)) ; Anisovich, A V (U. Bonn (main)) ; Baker, C A (Rutherford) ; Barnett, B M (U. Bonn (main)) ; Batty, C J (Rutherford) ; Blum, P (Karlsruhe U.) ; Braune, K (LMU Munich (main)) ; Credé, V (U. Bonn (main)) ; Crowe, K M (LBNL, Berkeley) ; Doser, M (CERN) ; Dunnweber, W (LMU Munich (main)) ; Engelhardt, D (Karlsruhe U.) ; Faessler, M A (LMU Munich (main)) ; Haddock, R P (UCLA, Los Angeles (main)) ; Heinsius, F H (LBNL, Berkeley) ; Hessey, N P (LMU Munich (main)) ; Kalinowsky, H (U. Bonn (main)) ; Jamnik, D (LMU Munich (main)) ; Kammel, P (LBNL, Berkeley) ; Kisiel, J (CERN) ; Klempt, E (U. Bonn (main)) ; Koch, H (Ruhr U., Bochum (main)) ; Kunze, M (Ruhr U., Bochum (main)) ; Kurilla, U (Ruhr U., Bochum (main)) ; Landua, R (CERN) ; Matthay, H (Ruhr U., Bochum (main)) ; Meyer, C A (Carnegie Mellon U. (main)) ; Meyer-Wildhagen, F (LMU Munich (main)) ; Ouared, R (CERN) ; Peters, K (Ruhr U., Bochum (main)) ; Pick, B (U. Bonn (main)) ; Ratajczak, M (Ruhr U., Bochum (main)) ; Regenfus, Christian (U. Zurich (main)) ; Reinnarth, J (U. Bonn (main)) ; Sarantsev, A V (U. Bonn (main)) ; Strohbusch, U (U. Hamburg (main)) ; Suffert, M (Strasbourg, CRN) ; Suh, J S (U. Bonn (main)) ; Thoma, U (U. Bonn (main)) ; Wallis-Plachner, S (LMU Munich (main)) ; Walther, D (U. Bonn (main)) ; Wiedner, U (LMU Munich (main))
Publication	2004
Imprint	2004
Number of pages	8
In:	Eur. Phys. J. C 33 (2004) 23-30
DOI	10.1140/epjc/s2003-01540-6
Subject category	Particle Physics - Experiment
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 $\eta^\prime$ 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 $\Gamma_{\eta (1440)\rightarrow\pi^ + \pi^-\gamma}/ \Gamma_{\eta (1440)\rightarrow\pi^ + \pi^-\eta} = 0.111\pm 0.064$.

Corresponding record in: Inspire