Search for narrow exotic states in annihilations on 4He
L. Adiels,G. Backenstoss,P. Blüm,I. Bergström,Kjell Fransson,R. Guigas,H. Koch,Andras Kerek,M. Meyer,P. Pavlopoulos,H. Poth,U. Raich,B. Richter,J. Repond,M. Suffert,L. Tauscher,D. Tröster,Konstantin Zioutas +17 more
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TLDR
In this paper, the γ spectrum associated with p p annihilation on 4He at rest was measured, showing two peaks, at energies of 161.9 and 203.0 MeV, corresponding to intermediate narrow states of masses which seem to be related to states found in p p annihilations.About:
This article is published in Physics Letters B.The article was published on 1984-04-12 and is currently open access. It has received 6 citations till now. The article focuses on the topics: Annihilation.read more
Citations
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Journal ArticleDOI
Possible critical phenomena associated with the chiral symmetry breaking
Tetsuo Hatsuda,Teiji Kunihiro +1 more
TL;DR: In this article, the Nambu and Jona-Lasinio model was used as a QCD-motivated effective lagrangian for the chiral symmetry breaking.
Journal ArticleDOI
Low energy antiproton physics in the early LEAR era
Anthony M. Green,J.A. Niskanen +1 more
TL;DR: In this article, a review of developments in the field of low energy antinucleon physics since 1983, the year in which the Low Energy Antiproton Ring opened in CERN, is presented.
Journal ArticleDOI
Measurement of strong interaction effects in antiprotonic helium atoms
J.D. Davies,T.P. Gorringe,J. Lowe,J. M. Nelson,S. M. Playfer,G.J. Pyle,G.T.A. Squier,C.A. Baker,C.J. Batty,S.A. Clark,S. Sakamoto,Robert E. Welsh,R.G. Winter,E.W.A. Lingeman +13 more
TL;DR: In this paper, the strong interaction shift and width for the 2p level and the 3d level have been measured for antiprotonic helium atoms and compared with optical model calculations.
Journal ArticleDOI
An experimental study of antiproton-4He annihilation at rest
A. Adamo,Michelangelo Agnello,F. Balestra,G. Belli,G. Bendiscioli,A. Bertin,P. Boccaccio,G. Bonazzola,Tullio Bressani,M. Bruschi,M.P. Bussa,L. Busso,D. Calvo,M. Capponi,Piergiorgio Cerello,Corrado Cicalo,S. Costa,S. De Castro,F. D'Isep,Antonietta Donzella,L. Fava,A. Feliciello,L. Ferrero,A. Filippi,V. Filippini,D. Galli,R. Garfagnini,U. Gastaldi,P. Gianotti,A. Grasso,C. Guaraldo,Felice Iazzi,D.E. Kharzeev,Armando Lanaro,E. Lodi Rizzini,M. Lombardi,V. Lucherini,A. Maggiora,S. Marcello,U. Marconi,G. V. Margagliotti,G. Maron,A. Masoni,I. Massa,Bruno Minetti,Paolo Montagna,M. Morando,F. Nichitiu,D. Panzieri,P. Pauli,M. Piccinini,G. Piragino,M. Poli,G. Puddu,R. A. Ricci,E. Rossetto,Alberto Rotondi,A.M. Rozhdenstvensky,A. Saino,Paola Salvini,L. Santi,M.G. Sapozhnikov,N. Semprini Cesari,Sergio Serci,R. Spighi,Petar Temnikov,S. Tessaro,F. Tosello,V.I. Tretyak,G. L. Usai,L. Vannucci,Stefania Vecchi,G. Vedovato,L. Venturelli,Mauro Villa,A. Vitale,Aldo Zenoni,Antonio Zoccoli,Gianfranco Zosi +78 more
TL;DR: In this paper, the authors reported new experimental results on the annihilation of antiprotons stopped in a 4He gas target, which was carried out with the Obelix spectrometer installed at the LEAR machine of CERN.
Journal ArticleDOI
Nucleon-antinucleon bound states in a quark rearrangement model
J.A. Niskanen,Anthony M. Green +1 more
TL;DR: In this article, the possibility of deeply-bound N N states is studied in a quark rearrangement annihilation plus a meson exchange potential model, and it is shown that very narrow (Γ ∼- 1-10 MeV) bound states may be possible even for L = 0 with binding energies varying up to E B ⋍- 800-900 MeV in the proposed scheme.
References
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Journal ArticleDOI
Precise nuclear radii from electron scattering
TL;DR: In this article, independent empirical information on the properties of nuclear wave functions at large radii improves the precision of radii deduced from elastic electron scattering by a factor of 3.
Journal ArticleDOI
Evidence for narrow bound states related to the pp system
P. Pavlopoulos,G. Backenstoss,P. Blüm,Kjell Fransson,R. Guigas,N. Hassler,M. Izycki,Herbert Koch,A. Nilsson,H. Poth,M. Suffert,L. Tauscher,Konstantin Zioutas +12 more
TL;DR: In this article, the γ-ray spectrum accompanying the p p annihilation at rest has been measured with a large NaI(Tl) spectrometer with a confidence level of 99.0, 97.5%, and 98.2%.
Journal ArticleDOI
Proton-antiproton annihilations at rest into π0ω, π0η, π0γ, π0π0, and π0η′
G. Backenstoss,M. Hasinoff,P. Pavlopoulos,J. Repond,L. Tauscher,D. Tröster,P. Blüm,R. Guigas,H. Koch,M. Meyer,H. Poth,U. Raich,B. Richter,L. Adiels,I. Bergström,Kjell Fransson,Andras Kerek,M. Suffert,Konstantin Zioutas +18 more
TL;DR: In this article, the high-energy part of the spectrum was used to deduce branching ratios for the so far unobserved annihilation channels: R(p p →π 0 ω) = (2.38 ± 0.65)%, R( p p → π 0 η ) = (0.82 ± 0.04)% and an upper limit for the π0η′ channel was deduced.
Journal ArticleDOI
New results in the search for narrow states in the p system below threshold
B. Richter,L. Adiels,G. Backenstoss,I. Bergström,P. Blüm,Kjell Fransson,M. Glöckner,R. Guigas,M. Hasinoff,Andras Kerek,H. Koch,T. Kohler,M. Meyer,P. Pavlopoulos,H. Poth,U. Raich,J. Repond,M. Suffert,L. Tauscher,D. Tröster,Konstantin Zioutas +20 more
TL;DR: The γ-ray spectrum after p annihilation at rest was measured in two independent high-statistics runs as discussed by the authors, showing narrow peaks corresponding to masses of 1210, 1638, 1694 and 1771 MeV.
Journal ArticleDOI
The antiprotonic X-ray spectrum of liquid helium
H. Poth,R. Abela,G. Backenstoss,P. Blüm,W. Fetscher,R. Hagelberg,M. Izycki,Herbert Koch,A. Nilsson,P. Pavlopoulos,L. M. Simons,L. Tauscher +11 more
TL;DR: In this article, the X-ray spectrum of liquid p-He has been measured and the energies and relative intensities of the Xray transitions feeding the 3d and 2p levels were determined.
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