Ипсилон-мезон

Ипсилон-мезоны (ϒ) — нейтральные элементарные частицы с изотопическим спином 0, являющиеся мезонами со скрытой прелестью. Они представляют собой систему из b-кварка и b-антикварка (боттомоний) с чётным орбитальным квантовым числом[1].

Первый ипсилон-мезон ϒ(1S) был открыт в лаборатории Фермилаб в 1977 году в эксперименте E288[2].

Характеристики

Ипсилон-мезоны являются истинно нейтральными частицами, то есть являются античастицей для самого себя.

Частица Кварковый состав Энергия покоя, МэВ IG JPC Q S c b Среднее время жизни, с Основная мода распада
ϒ(1S)[3] 9460,40 ± 0,09 ± 0,04 0− 1−− 0 0 0 0 1,218⋅10−20
ϒ(2S)[4] 10023,40 ± 0,5 0− 1−− 0 0 0 0
ϒ(3S)[5] 10355,10 ± 0,5 0− 1−− 0 0 0 0
ϒ(4S)[6] 10579,40 ± 1,2 0− 1−− 0 0 0 0

См. также

Примечания

  1. ↑ Naming scheme for hadrons. Дата обращения: 25 июля 2011. Архивировано 5 августа 2011 года.
  2. ↑ D.C. Hom; et al. (1977). "Observation of a Dimuon Resonance at 9.5 Gev in 400-GeV Proton-Nucleus Collisions" (PDF). Physical Review Letters. 39 (5): 252—255. Bibcode:1977PhRvL..39..252H. doi:10.1103/PhysRevLett.39.252.
  3. ↑ PDG Particle Listings: Upsilon (1S)
  4. ↑ PDG Particle Listings: Upsilon (2S)
  5. ↑ PDG Particle Listings: Upsilon (3S)
  6. ↑ PDG Particle Listings: Upsilon (4S)

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