Λ-baryon
Lambda Baryon (Λ 0 ) |
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classification | |
Fermion Hadron Baryon |
|
properties | |
electric charge | neutral |
Resting energy | 1115.683 ± 0.006 MeV |
magnetic moment | -0.613 ± 0.004 μ N |
Spin parity | 1 ⁄ 2 + |
Isospin | 0 |
Strangeness | −1 |
average lifespan | (2.632 ± 0.020) · 10 −10 s |
Quark composition |
uds |
Λ c + -baryon |
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classification | |
Fermion Hadron Baryon |
|
properties | |
electric charge | 1 e (+1.602 10 −19 C ) |
Resting energy | 2286.46 ± 0.14 MeV |
Spin parity | 1 ⁄ 2 + |
Isospin | 0 |
Charm | +1 |
average lifespan | (2.00 ± 0.06) 10 −13 s |
Quark composition |
udc |
Λ b 0 -Baryon |
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---|---|
classification | |
Fermion Hadron Baryon |
|
properties | |
electric charge | neutral |
Resting energy | 5619.60 ± 0.17 MeV |
Beauty | −1 |
average lifespan | (1.470 ± 0.010) · 10 −12 s |
Quark composition |
udb |
The Λ-baryon , also known as lambda baryon , is a baryon that consists of an up , a down and a strange quark . It has spin 1/2, isospin 0, is electrically neutral and is therefore sometimes referred to as Λ 0 .
The Λ-baryon belongs to the class of hyperons .
description
The Λ 0 -baryon belongs to the SU (3) octet.
Almost 100% of it breaks down into a nucleon and a pion . The decay into a proton and a π - with 63.9% almost twice as likely as the decay into a neutron and a π 0 (35.8%).
About 17 resonances (short-lived excited states) of the Λ-baryon have been more or less unequivocally proven.
Λ c and Λ b
Heavy baryons have been detected that have a charm quark or a bottom quark instead of the s quark, i.e. with the quark composition udc and udb . They are referred to as Λ c (or Λ c + ) or Λ b (or Λ b 0 ) and are the lightest baryons with c or b quarks.
See also
Individual evidence
-
↑ a b c d The information on the particle properties (info box) are, unless otherwise stated, taken from:
M. Tanabashi et al .: 2018 Review of Particle Physics. In: Phys. Rev. D 98, 030001 (2018). Particle Data Group, accessed June 8, 2018 .