Observation of pairs of charmed particles produced by high-energy photons in nuclear emulsions coupled with a magnetic spectrometer期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Observation of pairs of charmed particles produced by high-energy photons in nuclear emulsions coupled with a magnetic spectrometer

Authors:	MI Adamivich YA Alexandrov JM Bolta L Bravo AM Cartacci MM Chernyavski A Conti G Crosetti MG Dagliana M Dameri G Diambrini-Palazzi G Di Caporiacco A Forino R Gessaroli E Higon SP Kharlamov VG Larionova R Llosa AP Waite

Institution:	1. Bologna,Italy Florence, Italy;4. Madrid (JEN), Spain;5. Moscow, USSR;6. Paris (LPNHE), France;7. Santander, USA;8. Valencia, Spain;9. Bonn, USA

Abstract:	Preliminary results of an experiment using nuclear emulsions exposed to a tagged photon beam at the CERN SPS (experiment WA58) are presented. Six events showing pairs of charmed particles have been found. One of these has been interpreted as an associated production of Λ_c⁺ and $D$ ⁰. The mean lifetime of the neutral D meson based on three events is τ⁰ = (0.58_?0.2^+0.8 × 10^?13 s,, whereas a statistical analysis of eight charged charmed particles, assumed to be D mesons, leads to an estimate of the mean lifetime of τ^± ≈ 4.4 × 10^?13 s.

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