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Status of the themistocle multi-mirror Cerenkov array for VHE/UHE source studies∗

Publikováno v: AIP Conference Proceedings.

The THEMISTOCLE collaboration has brought into operation an 18 telescope array designed to study the angular resolution that can be obtained through multiple, high precision timing measurements on the Cerenkov light front for primary gamma‐ray ener

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::25ee3d0c0e14cc8ab482cb4e21517094
https://doi.org/10.1063/1.40301

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The pion electromagnetic form factor in the time-like energy range

Publikováno v: Physics Letters B. 220:321-327

The e+e− → π+π− cross section has been measured from about 280 events (an order of magnitude more than the previous world statistics) in the energy interval 1.35 ⩽ s ⩽ 2.4 GeV with the DM2 detector at DCI. The pion squared form factor |F�

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ac5f7e8b90376151b866898b247c47f6
https://doi.org/10.1016/0370-2693(89)90060-9

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Baryon pair production in decays

Publikováno v: Nuclear Physics B. 292:653-669

The decays of 8.6 million J ψ produced at DCI in the DM2 detector are analyzed to measure baryon pair production. Angular distributions for J ψ → p p , Λ Λ , Σ 0 Σ 0 are in good agreement with first order QCD predictions. New measurements are

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::930cd0f49fe79620c5549e8f285bec3b
https://doi.org/10.1016/0550-3213(87)90663-8

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New measurements of the radiative decay modes of the φ-meson

Autor: A. Courau, G. Szklarz, Ph. Roy, R. Riskalla, S. Jullian, F. Laplanche, B. Dudelzak, B. Jean-Marie, D. Lalanne, B. Grelaud, G. Parrour, G. Cosme

Publikováno v: Physics Letters B. 63:352-356

The radiative decay models of the φ-meson have been studied: e + e − → φ → ηγ →3 γ ; e + e − → φ → π o γ →3 γ . Cross sections σ φ → ηγ →3 γ and σ φ → π o γ →3 γ have been measured at five energies in the φ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b8a93e9a9d724891a07e2dfdc64be287
https://doi.org/10.1016/0370-2693(76)90281-1

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A measurement of ηc → φφ in the radiative decay of the J/ψ

Publikováno v: Physics Letters B. 179:289-293

A total of 8.6 million J/ψ produced in the DM2 experiment at DCI have been analyzed looking for the ηc in the reaction J ψ →γη c →γφφ , both φ's decaying into two charged kaons. The ηc is observed, with m=(2968±5±7)MeV/c2 and with a p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b9182d4a773784ac51461e464aae2289
https://doi.org/10.1016/0370-2693(86)90583-6

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Pseudoscalar ωω production at threshold in J/ψ→ψωω decay

Publikováno v: Physics Letters B. 192:239-244

The 8.6 million J/ψ collected by the DM2 detector at DCI have been analysed looking for the J/ψ→γωω decay, both ω's decaying into π+π−π0. A clean signal of γωω events is observed with BR(J/ψ→γωω)=(1.41±0.20±0.42)×10 −3. The

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::38cdb70d71947c92ef8f794f5a7379f9
https://doi.org/10.1016/0370-2693(87)91176-2

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Radiative decay ofJ/ψ into γ π+ π−

Publikováno v: Zeitschrift für Physik C Particles and Fields. 36:369-376

The radiative decayJ/ψ → γ π+ π− has been studied using the 8.6 millionJ/ψ produced in the DM2 experiment at the DCIe +e− storage rings at Orsay. The π+ π− mass spectrum shows a cleanf 2 (1270) signal, and the possible presence of two

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d7299e8432e5450e3c7ba1b5b98684c7
https://doi.org/10.1007/bf01573930

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Evidence for an interference effect between ω and φ resonances in π+π−πo production by e+e− annihilation

Autor: G. Szklarz, R. Riskalla, D. Lalanne, F. Laplanche, Ph. Roy, S. Jullian, B. Dudelzak, A. Courau, B. Grelaud, G. Parrour, B. Jean Marie, G. Cosme

Publikováno v: Physics Letters B. 63:357-361

The cross section e + e − → π + π − π o has been measured in the φ energy region and at three other energies (915, 990, 1076 MeV) chosen outside the ω and φ resonances. In the same experiment the energy position and the width of the φ re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::809778a61e3dc7d5c225cc3c4763ff71
https://doi.org/10.1016/0370-2693(76)90282-3

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First observation of the ηc→ϱ0ϱ0 decay

Publikováno v: Physics Letters B. 200:215-220

The decay J/ψ→γηc→γπ+π−π+π− has been studied from the 8.6×106 J/ψ produced in the DM2 apparatus at DCI. A clear signal of (137±23) events is observed in the ηc mass range. A partial wave analysis shows that the decay proceeds main

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5825f7428a12cfb7f9150393a0f2802e
https://doi.org/10.1016/0370-2693(88)91139-2

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Search of glueballs in the decay

Publikováno v: Physics Letters B. 179:294-300

In a study of the radiative decay J ψ →γφφ→γ K + K − K + K − , from the 8.6 million J ψ produced in the DM2 experiment at DCI, we found a large production of events with φφ mass below the ηc. The branching ratio, for mφφ BR ( J ψ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1a9e1807157a233963052daf0b93a7e3
https://doi.org/10.1016/0370-2693(86)90584-8

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