Neutral meson production in $p$-Be and $p$-Au collisions at 450 GeV beam energy
- Agakichiev, G
- Appenheimer, M
- Averbeck, R
- Ballester, F
- Baur, R
- Brenschede, A
- Díaz, J
- Drees, A
- Faschingbauer, U
- Ferrero, J L
- Fischer, P
- Fraenkel, Zeev
- Franke, M
- Fuchs, C
- Gatti, E
- Glässel, P
- Günzel, T F
- Pérez de los Heros, C
- Hess, F
- Holzmann, R
- Irmscher, D
- Jacob, C
- Kühn, W
- Lenkeit, B C
- Löhner, H
- Marin, A
- Marqués, F M
- Martínez, G
- Metag, V
- Notheisen, M
- Novotny, R
- Olsen, L H
- Ostendorf, R W
- Panebratsev, Yu A
- Pfeiffer, A
- Ravinovich, I
- Rehak, P
- Sampietro, M
- Schön, A
- Schükraft, Jürgen
- Schutz, Y
- Shimansky, S S
- Shor, A
- Simon, R S
- Specht, H J
- Steiner, V
- Tapprogge, Stefan
- Tel-Zur, G
- Tserruya, Itzhak
- Ullrich, T S
- Wilschut, H W
- Wurm, J P
- Yurevich, V I
DOIAbstract
In a joint experiment the TAPS and CERES collaborations have studied the production of the neutral mesons $\pi^{0}$, $\eta$ and $\omega$ in 450 GeV $p$-Be and $p$-Au collisions at the CERN SPS. The mesons were identified by their $\pi^{0} \rightarrow \gamma\gamma, \eta \rightarrow \gamma\gamma$, and $\omega \rightarrow \pi^{0}\gamma$ decay modes. The cross sections were measured down to very low $p_{T}$ ($\geq$ 20 MeV/c) near mid-rapidity $(3.0<y<4.0)$. The $\eta$ and $\omega$ cross sections are smaller than expected from extrapolations of earlier data to low $p_{T}$. Integrated over all $p_{T}$, the ratios $\eta/\pi^{0}$ and $\omega/\pi^{0}$ are lower by about 25% compared to previously published values. The reduction may be attributed to ...
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