Wallis-Plachner, S - Search Results

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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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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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$\bar{\rm p}{\rm p}$-annihilation into $\omega\pi^{0}$, $\omega\eta$ and $\omega\eta^{\prime}$ at 600, 1200 and 1940 MeV/$c$ / Crystal Barrel Collaboration
The annihilation channels p¯p→ωπ0,ωη,ωη′p¯p→ωπ0,ωη,ωη′ were studied with the Crystal Barrel detector at LEAR at p¯p¯-momenta of 600, 1200, and 1940 MeV/ cc. In most cases angular distributions were measured which allowed a complete JPJP-analysis using the helicity formalism. [...]
Geneva : CERN, 2000 - Published in : Eur. Phys. J. C 12 (2000) 429-439 Fulltext: PDF;

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Observation of Pontecorvo Reactions with Open Strangeness : $\overline{p} d \to \lambda K^0$ and $\overline{p} d \to \sigma^{0} K^0$ / Crystal Barrel Collaboration
Geneva : CERN, 1999 - Published in : Phys. Lett. B 469 (1999) 276-286 Fulltext: PDF;

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$\overline{p} d$ annihilation at rest into $\pi^{+} \pi^{-} \pi^{-} p$ (spectator) / Crystal Barrel Collaboration
Geneva : CERN, 1999 - Published in : Phys. Lett. B 450 (1999) 275-280 Fulltext: PDF;

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1	Wallis-Plachner, S.

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