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1.
$\overline{p}p$ annihilation into four charged pions at rest and in flight / OBELIX Collaboration
The spin-parity analysis of the data on the pp to 2 pi /sup +/ 2 pi /sup $/annihilation reaction at rest in liquid and in gaseous hydrogen at 3 bar pressure and in flight at p momentum of approximately= 50 MeV/c, collected by the Obelix spectrometer at the LEAR complex of CERN, is presented. The relative branching ratios (a /sub 1/ (1260) to sigma pi )/(a/sub 1/(1260) to rho pi ) = 0.06 +or- 0.05 and ( pi (1300) to sigma pi )/( pi (1300) to rho pi ) = 2.2 +or- 0.4 are obtained. [...]
2004 - Published in : Eur. Phys. J. C 35 (2004) 21-33
2.
Study of $f_{0}$ decays into four neutral pions / Crystal Barrel Collaboration
A simultaneous analysis of two different 5 pi final states from pN annihilation at rest is used to study the decays of isoscalar 0/sup ++/ states into 4 pi /sup 0/. The data demand two scalar states, the f/sub 0/(1370) with m=1395+or-40 MeV/c/sup 2/, Gamma =275+or-55 MeV/c /sup 2/ and the f/sub 0/(1500) with mass and width compatible with previous findings. [...]
Geneva : CERN, 2001 - Published in : Eur. Phys. J. C 19 (2001) 667-75 Fulltext: PDF;
3.
Evidence for a 4 pi decay of an isobar at 1300 MeV / Bartke, Jerzy ; De la Vaissierre, C ; Debray, J ; Laberrigue, J ; Yiou, T P ; Hulsizer, R
The authors present evidence for a resonance of mass 1300 MeV that decays sequentially by X to A/sub 1/ pi to rho pi pi to pi /sup +/ pi /sup +/ pi /sup -/ pi /sup -/ in the 6 pi annihilation channel of pp at 3.6 GeV/c. (0 refs)..
CERN, 1974 Published version from CERN: PDF;
In : Symposium on Antinucleon-Nucleon Interactions, Liblice-Prague, Czech Republic, 25 - 28 Jun 1974, pp.171 (CERN-1974-018)
4.
Dynamical selection rules from $\overline{p}p$ annihilation at rest in three meson final states / OBELIX Collaboration
The hadronic annihilation branching-ratios in quasi-two-body final states have been obtained from the observation of the reactions pp to pi /sup +/ pi /sup -/ pi /sup 0/, K/sup +/K/sup -/ pi /sup 0/, K/sup +or-/ pi -or+K/sup 0/ at rest in hydrogen targets at different densities. The enhancement or suppression of specific hadronic channels connected to dynamical selection rules is observed in the production of different resonances both in protonium S and P-waves, systematically investigated for the first time. [...]
2004 - Published in : Eur. Phys. J. C 35 (2004) 177-187
5.
Proton-antiproton annihilation into $6\gamma$ and $7\gamma$ / Amsler, Claude (CERN) /Crystal Barrel Collaboration
Preliminary results on omega pi /sup 0/ pi /sup 0/ and omega eta pi /sup 0/ in pp annihilation at rest and on pp annihilation in flight into eta eta pi /sup 0/ are briefly described. In omega eta pi /sup 0 / there is evidence for 1/sup +-/ and 1/sup --/ mesons decaying to omega eta . [...]
Geneva : CERN, 2000 - Published in : Nucl. Phys. A 675 (2000) 67-70
6.
$\overline{p}p$ annihilations into strange particle final states at 700-750 MeV/c / Aguilar-Benítez, M ; Barreiro, F ; Cerrada, M ; Chaudhary, B S ; D'Andlau, C ; Defoix, C ; Díaz, J ; Dobrzynski, L ; Fernández, E ; Ferrando, A et al.
Presents the following preliminary results obtained by the Bombay- CERN-College de France-Madrid collaboration. (1) Measurements of the total and differential cross sections for the reactions pp to K/sub 1 //sup 0/K/sub 1//sup 0/ and pp to K/sub 1//sup 0/K/sub 2//sup 0/ at 700 and 750 MeV/c. [...]
CERN, 1974 Published version from CERN: PDF;
In : Symposium on Antinucleon-Nucleon Interactions, Liblice-Prague, Czech Republic, 25 - 28 Jun 1974, pp.9-27 (CERN-1974-018)
7.
Antiproton-proton annihilation at rest into $K^{+}K^{-}\pi^{0}$ / Crystal Barrel Collaboration
The annihilation channel pp to K/sup +/K/sup -/ pi /sup 0/ in liquid hydrogen at rest has been studied with the Crystal Barrel detector at LEAR. The measured branching ratio is: BR(pp to K/sup +/K/sup -/ pi /sup 0/)=(2.37+or-0.15)*10/sup -3/. [...]
Geneva : CERN, 1999 - Published in : Phys. Lett. B 468 (1999) 178-188 Fulltext: PDF;
8.
Single and multinucleon antiproton-$^{4}$He annihilation at rest / Montagna, P ; Bendiscioli, G ; Filippini, V ; Fontana, A ; Rotondi, A ; Salvini, P ; Panzarasa, A ; Bargiotti, M ; Bertin, A ; Bruschi, M et al.
The p annihilation at rest in a NTP /sup 4/He-gas target has been studied by means of the Obelix spectrometer installed at the LEAR accelerator of CERN. Reactions with production of 2 pi /sup -/2 pi /sup +/, 2 pi /sup -/3 pi /sup +/, 2 pi /sup -/2 pi /sup +/p, 2 pi /sup -/ pi /sup +/2p, 2 pi /sup -/3p (with p pi >80 MeV/c and p/sub p />300 MeV/c) have been selected and single- and multinucleon annihilations identified. [...]
2002 - Published in : Nucl. Phys. A 700 (2002) 159-92
9.
Study of the $K^{+}K^{-} \pi^{+}\pi^{-}\pi^{0}$ final state in antiproton annihilation at rest in gaseous hydrogen at NTP with the OBELIX spectrometer / OBELIX Collaboration
A spin-parity analysis of a sample of pp to K/sup +/K/sup -/ pi /sup +/ pi /sup -/ pi /sup 0/ annihilation events taken at rest in gaseous H/sub 2/ at NTP is reported. The invariant mass spectrum of the K/sup +/K/sup -/ pi /sup 0/ system shows the presence of the E/t resonance pattern at 1.42 GeV. [...]
2002 - Published in : Phys. Lett. B 545 (2002) 261-71
10.
Study of antiproton annihilation on neutrons into $\omega\pi^{-} \pi^{0}$ / Crystal Barrel Collaboration
Data are presented on antiproton neutron annihilation at rest into omega pi /sup -/ pi /sup 0/ taken with the Crystal Barrel detector at LEAR (CERN) using a liquid deuterium target. The partial wave analysis shows evidence for at least two omega pi vector resonances above the rho (770) ground-state. [...]
2004 - Published in : Nucl. Phys. A 740 (2004) 130-46

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