B meson

B meson
Composition
  • B+
    : ub
  • B0
    : db
  • B0
    s    : sb
  • B+
    c    : cb
Statisticsbosonic
Familymesons
Interactionsstrong, weak, electromagnetic, gravitational
SymbolB+
, B−
, B0
, B0
, B0
s, B0
s, B+
c, B−
c
Antiparticle
  • B+
    : B−
  • B0
    : B0
  • B0
    s    : B0
    s
  • B+
    c    : B−
    c
Mass
  • B+
    : 5279.34±0.12 MeV/c2
  • B0
    : 5279.65±0.12 MeV/c2
  • B0
    s    : 5366.88±0.14 MeV/c2
  • B+
    c    : 6274.9±0.8 MeV/c2
Mean lifetime
  • B+
    : (1.638±0.004)×10−12 s
  • B0
    : (1.519±0.004)×10−12 s
  • B0
    s    : (1.515±0.004)×10−12 s
  • B+
    c    : (0.510±0.009)×10−12 s
Electric charge
  • B±
    , B±
    c    : ±1 e
  • B0
    , B0
    s    : 0 e
Spin0 ħ
StrangenessB0
s: −1
CharmB+
c: +1
Bottomness+1
Isospin
  • B+
    : +⁠1/2⁠
  • B0
    : −⁠1/2⁠
  • B0
    s    , B+
    c    : 0
Parity−1

In particle physics, B mesons are mesons composed of a bottom antiquark and either an up (B+
), down (B0
), strange (B0
s) or charm quark (B+
c). The combination of a bottom antiquark and a top quark is not thought to be possible because of the top quark's short lifetime. The combination of a bottom antiquark and a bottom quark is not a B meson, but rather bottomonium, which is something else entirely.

Each B meson has an antiparticle that is composed of a bottom quark and an up (B−
), down (B0
), strange (B0
s) or charm (B−
c) antiquark respectively.

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