B meson

B meson
Composition

  • B+
    :
    u

    b

  • B0
    :
    d

    b

  • B0
    s    :
    s

    b

  • B+
    c    :
    c

    b
StatisticsBosonic
FamilyMesons
InteractionsStrong, Weak, Gravitational, Electromagnetic
Symbol
B+
,
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
Strangeness
B0
s: −1
Charm
B+
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.