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Production and decay of $\eta^\prime$(958) and $\eta$(1440) in $\bar{p} p$ annihilation at rest / 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) et al.
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. [...]
2004 - 8 p. - Published in : Eur. Phys. J. C 33 (2004) 23-30

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Annihilation at rest of antiprotons and protons into neutral particles / Crystal Barrel Collaboration
Annihilation of antiprotons and protons at rest into neutral particles has been studied with the Crystal Barrel detector at LEAR. Annihilation frequencies are determined for final states containing π 0 , η , η ′ and ω mesons using a liquid and a room temperature, 12 bar, gaseous hydrogen target. [...]
2003 - Published in : Nucl. Phys. A 720 (2003) 357

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Coupled channel analysis of proton-antiproton annihilation into π0π0π0, π0ηη and π0π0η / Crystal Barrel Collaboration
We confirm the existence of the two I G ( J PC ) = 0 + (0 ++ ) resonances f 0 (1370) and f 0 (1500) reported by us in earlier analyses. The analysis presented here couples the final states π 0 π 0 π 0 , π 0 π 0 η and π 0 ηη of p p annihilation at rest. [...]
Amsterdam : Elsevier, 1995 - Published in : Phys. Lett. B 355 (1995) 425 Fulltext: PDF;

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Search for a new light gauge boson in π0, η and η' decays / Crystal Barrel Collaboration
Upper limits for the production of new light gauge bosons in π0, η and η′ decays have been obtained with the Crystal Barrel detector. The kinematically well-constrained reactions p̅p → π0π0 P have been studied, where P ? π 0, η, η′ decays through the emission of a single photon recoiling against a missing state X. [...]
1996 - Published in : Z. Phys. C 70 (1996) 219

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Proton-antiproton annihilation at rest into $K_{L}K^{±}\pi^{±}$ / Crystal Barrel Collaboration
Amsterdam : Elsevier, 1998 - Published in : Phys. Rev. D 57 (1998) 3860 APS Published version, local copy: PDF;

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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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Branching ratios for pbarp annihilation at rest into two-body final states / Abele, A ; Adomeit, J ; Amsler, Claude ; Baker, C A ; Barnett, B M ; Batty, C J ; Benayoun, M ; Bischoff, S ; Blüm, P ; Braune, K et al.
Measurements of two-body branching ratios for pbarp annihilations at rest in liquid and gaseous (12 rho sub S sub T sub P) hydrogen are reported. Channels studied are pbarp-> pi sup 0 pi sup 0 ,pi sup 0 eta, K sup 0 sub S K sup 0 sub L , K sup + K sup -. [...]
2001 - Published in : Nucl. Phys. A 679 (2001) 563-576 Fulltext: PDF;

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Comment on "Protonium annihilation into $\pi^{0} \pi^{0}$ at rest in a liquid hydrogen target" / Crystal Barrel Collaboration
We comment on the recent paper published by the Obelix Collaboration on protonium annihilation into pi /sup 0/ pi /sup 0/ at rest in a liquid hydrogen target ÝPhys. Rev. [...]
2002 - Published in : Phys. Rev. D 66 (2002) 058101 APS Published version, local copy: PDF;

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Test of N.bar.N potential models : isospin relations in p.bar.d annihilations at rest and the search for quasinuclear bound states / Abele, A ; Adomeit, J ; Amsler, Claude ; Baker, C A ; Barnett, B M ; Batty, C J ; Benayoun, M ; Bischoff, S ; Blüm, H P ; Braune, K et al.
We have determined branching ratios for antiproton annihilations at rest on protons or neutrons in liquid deuterium which we compare to frequencies of isospin-related processes in antiproton-proton annihilations. Using the annihilation rates into pi /sup 0/ pi /sup 0 / and pi /sup -/ pi /sup 0/ where the annihilation took place on the proton or neutron, respectively, we discuss the fraction of S-wave and P-wave annihilation in liquid D/sub 2/. [...]
Geneva : CERN, 2000 - Published in : Eur. Phys. J. C 17 (2000) 583-92 Fulltext: PDF;

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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;

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