Лямбда-баріон

Лямбда-баріони — елементарні частинки, баріони, які складаються з d-кварка, u-кварка і одного з кварків із додатковим ароматом: дивністю, чарівністю або красою. Носій четвертого можливого аромату, правдивий кварк не утворює адронів. Всього існує три лямбда-баріони. Всі вони ферміони зі спіном 1/2. У кожного існує своя античастинка.

Перший із лямбда-баріонів, Λ0
-баріон був відкритий у 1947 в космічних променях. Він мав значний час життя, як і каони, що призвело до запровадження нового квантового числа — дивності.

Перелік

Лямбда-баріони
Назва Символ Складові
кварки 		Маса спокою (МеВ/c2) I JP Q (e) S C B' T Час життя (s) Розпадається на
Lambda[1]

Λ0

u d s 1,115.683 ± 0.006 0 1⁄2+ 0 −1 0 0 0 2.631 ± 0.020 × 10−10 p+
 + π−
 або
n0
 + π0
charmed Lambda[2]

Λ+
c

u d c 2,286.46 ± 0.14 0 1⁄2 + +1 0 +1 0 0 2.00 ± 0.06 × 10−13 Див. http://pdg.lbl.gov/2008/listings/s033.pdf [Архівовано 11 лютого 2017 у Wayback Machine.]
bottom Lambda[3]

Λ0
b

u d b 5,620.2 ± 1.6 0 1⁄2 + 0 0 0 −1 0

1.409+0.055
−0.054 × 10−12

Див. http://pdg.lbl.gov/2008/listings/s040.pdf [Архівовано 30 січня 2017 у Wayback Machine.]
top Lambda†

Λ+
t

u d t — 0 1⁄2 + +1 0 0 0 +1 — —

† ↑  Частинка не спостерігалася, але наведена для повноти.

Примітки

  1. ↑ C. Amsler et al. (2008): [[https://web.archive.org/web/20170211045710/http://pdg.lbl.gov/2008/listings/s018.pdf Архівовано 11 лютого 2017 у Wayback Machine.] [Архівовано 11 лютого 2017 у Wayback Machine.] [Архівовано 11 лютого 2017 у Wayback Machine.] Particle listings — Λ]
  2. ↑ C. Amsler et al. (2008): [[https://web.archive.org/web/20170211045857/http://pdg.lbl.gov/2008/listings/s033.pdf Архівовано 11 лютого 2017 у Wayback Machine.] [Архівовано 11 лютого 2017 у Wayback Machine.] [Архівовано 11 лютого 2017 у Wayback Machine.] Particle listings — Λ
    c    ]
  3. ↑ C. Amsler et al. (2008): [[https://web.archive.org/web/20170130221406/http://pdg.lbl.gov/2008/listings/s040.pdf Архівовано 30 січня 2017 у Wayback Machine.] [Архівовано 30 січня 2017 у Wayback Machine.] [Архівовано 30 січня 2017 у Wayback Machine.] Particle listings — Λ
    b    ]

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