Search for light neutral objects photo-produced in a crystal strong field and decaying into $e^{+}e^{-}$ pairs
| Autor: | Bernard Ille, D. Sillou, J. Dufournaud, A. Feliciello, R. Genre, S. Costa, B. Farizon Mazuy, G. Bologna, G. Bassompierre, R. Kirsch, M. Chevallier, M. Spighel, P. Lautesse, M.J. Gaillard, D. Boget, Michel Farizon, E. Rossetto, M. Gouanere, M. Richard, R. Garfagnini |
|---|---|
| Přispěvatelé: | Flores, Sylvie, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), CAS-PHABIO, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3) |
| Jazyk: | angličtina |
| Rok vydání: | 1995 |
| Předmět: |
Physics
Nuclear and High Energy Physics Range (particle radiation) Photon 010308 nuclear & particles physics Monte Carlo method Function (mathematics) 01 natural sciences Crystal Nuclear physics 0103 physical sciences Atomic physics 010306 general physics Absorption (electromagnetic radiation) Event (particle physics) Energy (signal processing) Particle Physics - Experiment |
| Zdroj: | Physics Letters B Physics Letters B, Elsevier, 1995, 355, pp.584-594 |
| ISSN: | 0370-2693 |
| Popis: | We describe a search for a light neutral object X0 possibly produced by ≈ 100 GeV photons interacting with the QED strong field encountered along the axis of a cooled Ge crystal. We look at the e+e− decay mode, in short (10−18−10−12 s) as well as long (10−13−10−8 s) lifetime detection conditions. For a mass of 1.8 ±0.2MeV/c2 (“Darmstadton” mass) we find no evidence for X0 production. The upper limit for the ratio between e+e− decay rate and pair creation is given as a function of the X0 lifetime. It reaches ≈ 5 × 10−4 and ≈ 2 × 10−5 in the short and long lifetime mode, respectively, including the crystal absorption contribution. However, for the long-lifetime mode and 108 incident photons, 9 events are compatible with neutral objects having masses ranging from 2.1 to 3.5 MeV c 2 . A Monte Carlo simulation of the background gives only 1 event in the same energy range. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect