Citation: C. Amsler
et al.
(Particle Data Group), PL
B667
, 1 (2008) and 2009 partial update for the 2010 edition (URL: http://pdg.lbl.gov)
GAUGE AND HIGGS BOSONS
GAUGE AND HIGGS BOSONS
GAUGE AND HIGGS BOSONS
GAUGE AND HIGGS BOSONS
γ
γ
γ
γ
I
(
JPC
) = 0,1(1
− −
)
Mass
m
<
1
×
10
−
18
eV
Charge
q
<
1
×
10
−
35
e
Mean life
Ï„
= Stable
g
g
g
g
or gluon
or gluon
or gluon
or gluon
I
(
JP
) = 0(1
−
)
Mass
m
= 0
[
a
]
SU(3) color octet
W
W
W
W
J
= 1
Charge =
±
1
e
Mass
m
= 80
.
398
±
0
.
025 GeV
m
Z
−
m
W
= 10
.
4
±
1
.
6 GeV
m
W
+
−
m
W
−
=
−
0
.
2
±
0
.
6 GeV
Full width Γ = 2
.
141
±
0
.
041 GeV
Â
N
Ï€
±
®
= 15
.
70
±
0
.
35
Â
N
K
±
®
= 2
.
20
±
0
.
19
Â
N
p
®
= 0
.
92
±
0
.
14
Â
N
charged
®
= 19
.
39
±
0
.
08
HTTP://PDG.LBL.GOV
Page 1
Created: 6/1/2009 14:31
Citation: C. Amsler
et al.
(Particle Data Group), PL
B667
, 1 (2008) and 2009 partial update for the 2010 edition (URL: http://pdg.lbl.gov)
W
−
modes are charge conjugates of the modes below.
p
W
+ DECAY MODES
W
+ DECAY MODES
W
+ DECAY MODES
W
+ DECAY MODES
Fraction (Γ
i
/Γ)
Confidence level (MeV/
c
)
`
+
ν
[
b
]
(10
.
80
±
0
.
09) %
–
e
+
ν
(10
.
75
±
0
.
13) %
40199
µ
+
ν
(10
.
57
±
0
.
15) %
40199
Ï„
+
ν
(11
.
25
±
0
.
20) %
40179
hadrons
(67
.
60
±
0
.
27) %
–
Ï€
+
γ
<
8
×
10
−
5
95%
40199
D
+
s
γ
<
1
.
3
×
10
−
3
95%
40175
c
X
(33
.
4
±
2
.
6 ) %
–
c s
(31
+ 13
−
11
) %
–
invisible
[
c
]
( 1
.
4
±
2
.
8 ) %
–
Z
Z
Z
Z
J
= 1
Charge = 0
Mass
m
= 91
.
1876
±
0
.
0021 GeV
[
d
]
Full width Γ = 2
.
4952
±
0
.
0023 GeV
Γ
¡
`
+
`
−
¢
= 83
.
984
±
0
.
086 MeV
[
b
]
Γ
¡
invisible
¢
= 499
.
0
±
1
.
5 MeV
[
e
]
Γ
¡
hadrons
¢
= 1744
.
4
±
2
.
0 MeV
Γ
¡
µ
+
µ
−
¢
/Γ
¡
e
+
e
−
¢
= 1
.
0009
±
0
.
0028
Γ
¡
Ï„
+
Ï„
−
¢
/Γ
¡
e
+
e
−
¢
= 1
.
0019
±
0
.
0032
[
f
]
Average charged multiplicity
Average charged multiplicity
Average charged multiplicity
Average charged multiplicity
Â
N
charged
®
= 20
.
76
±
0
.
16
(S = 2.1)
Couplings to leptons
Couplings to leptons
Couplings to leptons
Couplings to leptons
g
`
V
=
−
0
.
03783
±
0
.
00041
g
u
V
= 0
.
29
+ 0
.
10
−
0
.
08
g
d
V
=
−
0
.
33
+ 0
.
05
−
0
.
07
g
`
A
=
−
0
.
50123
±
0
.
00026
g
u
A
= 0
.
50
+ 0
.
04
−
0
.
07
g
d
A
=
−
0
.
524
+ 0
.
050
−
0
.
030
g
ν
`
= 0
.
5008
±
0
.
0008
g
ν
e
= 0
.
53
±
0
.
09
g
ν
µ
= 0
.
502
±
0
.
017
HTTP://PDG.LBL.GOV
Page 2
Created: 6/1/2009 14:31
Citation: C. Amsler
et al.
(Particle Data Group), PL
B667
, 1 (2008) and 2009 partial update for the 2010 edition (URL: http://pdg.lbl.gov)
Asymmetry parameters
Asymmetry parameters
Asymmetry parameters
Asymmetry parameters
[
g
]
A
e
= 0
.
1515
±
0
.
0019
A
µ
= 0
.
142
±
0
.
015
A
Ï„
= 0
.
143
±
0
.
004
A
s
= 0
.
90
±
0
.
09
A
c
= 0
.
670
±
0
.
027
A
b
= 0
.
923
±
0
.
020
Charge asymmetry (%) at
Z
pole
Charge asymmetry (%) at
Z
pole
Charge asymmetry (%) at
Z
pole
Charge asymmetry (%) at
Z
pole
A
(0
`
)
FB
= 1
.
71
±
0
.
10
A
(0
u
)
FB
= 4
±
7
A
(0
s
)
FB
= 9
.
8
±
1
.
1
A
(0
c
)
FB
= 7
.
07
±
0
.
35
A
(0
b
)
FB
= 9
.
92
±
0
.
16
Scale factor/
p
Z
DECAY MODES
Z
DECAY MODES
Z
DECAY MODES
Z
DECAY MODES
Fraction (Γ
i
/Γ)
Confidence level (MeV/
c
)
e
+
e
−
( 3
.
363
±
0
.
004 ) %
45594
µ
+
µ
−
( 3
.
366
±
0
.
007 ) %
45594
Ï„
+
Ï„
−
( 3
.
370
±
0
.
008 ) %
45559
`
+
`
−
[
b
]
( 3
.
3658
±
0
.
0023) %
–
invisible
(20
.
00
±
0
.
06
) %
–
hadrons
(69
.
91
±
0
.
06
) %
–
(
u u
+
c c
)/2
(11
.
6
±
0
.
6
) %
–
(
d d
+
s s
+
b b
)/3
(15
.
6
±
0
.
4
) %
–
c c
(12
.
03
±
0
.
21
) %
–
b b
(15
.
12
±
0
.
05
) %
–
b b b b
( 3
.
6
±
1
.
3
)
×
10
−
4
–
g g g
<
1
.
1
%
CL=95%
–
Ï€
0
γ
<
5
.
2
×
10
−
5 CL=95%
45594
η γ
<
5
.
1
×
10
−
5 CL=95%
45592
ω γ
<
6
.
5
×
10
−
4 CL=95%
45590
η
0
(958)
γ
<
4
.
2
×
10
−
5 CL=95%
45589
γ γ
<
5
.
2
×
10
−
5 CL=95%
45594
γ γ γ
<
1
.
0
×
10
−
5 CL=95%
45594
Ï€
±
W
∓
[
h
]
<
7
×
10
−
5 CL=95%
10150
Ï
±
W
∓
[
h
]
<
8
.
3
×
10
−
5 CL=95%
10125
J
/ψ
(1
S
)X
( 3
.
51
+ 0
.
23
−
0
.
25
)
×
10
−
3
S=1.1
–
ψ
(2
S
)X
( 1
.
60
±
0
.
29
)
×
10
−
3
–
χ
c
1
(1
P
)X
( 2
.
9
±
0
.
7
)
×
10
−
3
–
χ
c
2
(1
P
)X
<
3
.
2
×
10
−
3 CL=90%
–
HTTP://PDG.LBL.GOV
Page 3
Created: 6/1/2009 14:31
Citation: C. Amsler
et al.
(Particle Data Group), PL
B667
, 1 (2008) and 2009 partial update for the 2010 edition (URL: http://pdg.lbl.gov)
Î¥
(1
S
) X +
Î¥
(2
S
) X
+
Î¥
(3
S
) X
( 1
.
0
±
0
.
5
)
×
10
−
4
–
Î¥
(1
S
) X
<
4
.
4
×
10
−
5 CL=95%
–
Î¥
(2
S
) X
<
1
.
39
×
10
−
4 CL=95%
–
Î¥
(3
S
) X
<
9
.
4
×
10
−
5 CL=95%
–
(
D
0
/
D
0
) X
(20
.
7
±
2
.
0
) %
–
D
±
X
(12
.
2
±
1
.
7
) %
–
D
∗
(2010)
±
X
[
h
]
(11
.
4
±
1
.
3
) %
–
D
s
1
(2536)
±
X
( 3
.
6
±
0
.
8
)
×
10
−
3
–
D
sJ
(2573)
±
X
( 5
.
8
±
2
.
2
)
×
10
−
3
–
D
∗0
(2629)
±
X
searched for
–
B
+
X
[
i
]
( 6
.
08
±
0
.
13
) %
–
B
0
s
X
[
i
]
( 1
.
59
±
0
.
13
) %
–
B
+
c
X
searched for
–
Λ
+
c
X
( 1
.
54
±
0
.
33
) %
–
Ξ
0
c
X
seen
–
Ξ
b
X
seen
–
b
-baryon X
[
i
]
( 1
.
38
±
0
.
22
) %
–
anomalous
γ
+ hadrons
[
j
]
<
3
.
2
×
10
−
3 CL=95%
–
e
+
e
−
γ
[
j
]
<
5
.
2
×
10
−
4 CL=95%
45594
µ
+
µ
−
γ
[
j
]
<
5
.
6
×
10
−
4 CL=95%
45594
Ï„
+
Ï„
−
γ
[
j
]
<
7
.
3
×
10
−
4 CL=95%
45559
`
+
`
−
γ γ
[
k
]
<
6
.
8
×
10
−
6 CL=95%
–
q q
γ γ
[
k
]
<
5
.
5
×
10
−
6 CL=95%
–
ν ν γ γ
[
k
]
<
3
.
1
×
10
−
6 CL=95%
45594
e
±
µ
∓
LF
[
h
]
<
1
.
7
×
10
−
6 CL=95%
45594
e
±
Ï„
∓
LF
[
h
]
<
9
.
8
×
10
−
6 CL=95%
45576
µ
±
Ï„
∓
LF
[
h
]
<
1
.
2
×
10
−
5 CL=95%
45576
p e
L
,
B
<
1
.
8
×
10
−
6 CL=95%
45589
p
µ
L
,
B
<
1
.
8
×
10
−
6 CL=95%
45589
Higgs Bosons —
H
0
and
H
±
, Searches for
Higgs Bosons —
H
0
and
H
±
, Searches for
Higgs Bosons —
H
0
and
H
±
, Searches for
Higgs Bosons —
H
0
and
H
±
, Searches for
The limits for
H
0
1
and
A
0
refer to the
m
max
h
benchmark scenario for
the supersymmetric parameters.
H
0
H
0
H
0
H
0
Mass
m
>
114
.
4 GeV, CL = 95%
H
0
1
in Supersymmetric Models (
m
H
0
1
<
m
H
0
2
)
H
0
1
in Supersymmetric Models (
m
H
0
1
<
m
H
0
2
)
H
0
1
in Supersymmetric Models (
m
H
0
1
<
m
H
0
2
)
H
0
1
in Supersymmetric Models (
m
H
0
1
<
m
H
0
2
)
Mass
m
>
92
.
8 GeV, CL = 95%
HTTP://PDG.LBL.GOV
Page 4
Created: 6/1/2009 14:31
Citation: C. Amsler
et al.
(Particle Data Group), PL
B667
, 1 (2008) and 2009 partial update for the 2010 edition (URL: http://pdg.lbl.gov)
A
0
Pseudoscalar Higgs Boson in Supersymmetric Models
A
0
Pseudoscalar Higgs Boson in Supersymmetric Models
A
0
Pseudoscalar Higgs Boson in Supersymmetric Models
A
0
Pseudoscalar Higgs Boson in Supersymmetric Models
[
l
]
Mass
m
>
93
.
4 GeV, CL = 95%
tan
β >
0.4
H
±
H
±
H
±
H
±
Mass
m
>
79
.
3 GeV, CL = 95%
See the Particle Listings for a Note giving details of Higgs
Bosons.
Heavy Bosons Other Than
Heavy Bosons Other Than
Heavy Bosons Other Than
Heavy Bosons Other Than
Higgs Bosons, Searches for
Higgs Bosons, Searches for
Higgs Bosons, Searches for
Higgs Bosons, Searches for
Additional
W
Bosons
Additional
W
Bosons
Additional
W
Bosons
Additional
W
Bosons
W
0
with standard couplings decaying to
e
ν
Mass
m
>
1
.
000
×
10
3
GeV, CL = 95%
Additional
Z
Bosons
Additional
Z
Bosons
Additional
Z
Bosons
Additional
Z
Bosons
Z
0
SM
with standard couplings
Mass
m
>
923 GeV, CL = 95%
(
p p
direct search)
Mass
m
>
1500 GeV, CL = 95%
(electroweak fit)
Z
LR
of SU(2)
L
×
SU(2)
R
×
U(1)
(with
g
L
=
g
R
)
Mass
m
>
630 GeV, CL = 95%
(
p p
direct search)
Mass
m
>
860 GeV, CL = 95%
(electroweak fit)
Z
χ
of SO(10)
→
SU(5)
×
U(1)
χ
(with
g
χ
=
e
/cos
θ
W
)
Mass
m
>
822 GeV, CL = 95%
(
p p
direct search)
Mass
m
>
781 GeV, CL = 95%
(electroweak fit)
Z
ψ
of
E
6
→
SO(10)
×
U(1)
ψ
(with
g
ψ
=
e
/cos
θ
W
)
Mass
m
>
822 GeV, CL = 95%
(
p p
direct search)
Mass
m
>
475 GeV, CL = 95%
(electroweak fit)
Z
η
of
E
6
→
SU(3)
×
SU(2)
×
U(1)
×
U(1)
η
(with
g
η
=
e
/cos
θ
W
)
Mass
m
>
891 GeV, CL = 95%
(
p p
direct search)
Mass
m
>
619 GeV, CL = 95%
(electroweak fit)
HTTP://PDG.LBL.GOV
Page 5
Created: 6/1/2009 14:31
Citation: C. Amsler
et al.
(Particle Data Group), PL
B667
, 1 (2008) and 2009 partial update for the 2010 edition (URL: http://pdg.lbl.gov)
Scalar Leptoquarks
Scalar Leptoquarks
Scalar Leptoquarks
Scalar Leptoquarks
Mass
m
>
256 GeV, CL = 95% (1st generation, pair prod.)
Mass
m
>
298 GeV, CL = 95% (1st gener., single prod.)
Mass
m
>
316 GeV, CL = 95% (2nd gener., pair prod.)
Mass
m
>
73 GeV, CL = 95% (2nd gener., single prod.)
Mass
m
>
229 GeV, CL = 95% (3rd gener., pair prod.)
(See the Particle Listings for assumptions on leptoquark quan-
tum numbers and branching fractions.)
Axions (
A
0
) and Other
Axions (
A
0
) and Other
Axions (
A
0
) and Other
Axions (
A
0
) and Other
Very Light Bosons, Searches for
Very Light Bosons, Searches for
Very Light Bosons, Searches for
Very Light Bosons, Searches for
The standard Peccei-Quinn axion is ruled out. Variants with reduced
couplings or much smaller masses are constrained by various data.
The Particle Listings in the full
Review
contain a Note discussing
axion searches.
The best limit for the half-life of neutrinoless double beta decay with
Majoron emission is
>
7
.
2
×
10
24
years (CL = 90%).
HTTP://PDG.LBL.GOV
Page 6
Created: 6/1/2009 14:31
Citation: C. Amsler
et al.
(Particle Data Group), PL
B667
, 1 (2008) and 2009 partial update for the 2010 edition (URL: http://pdg.lbl.gov)
NOTES
[
a
] Theoretical value. A mass as large as a few MeV may not be precluded.
[
b
]
`
indicates each type of lepton (
e
,
µ
, and
Ï„
), not sum over them.
[
c
] This represents the width for the decay of the
W
boson into a charged
particle with momentum below detectability, p
<
200 MeV.
[
d
] The
Z
-boson mass listed here corresponds to a Breit-Wigner resonance
parameter. It lies approximately 34 MeV above the real part of the posi-
tion of the pole (in the energy-squared plane) in the
Z
-boson propagator.
[
e
] This partial width takes into account
Z
decays into
ν ν
and any other
possible undetected modes.
[
f
] This ratio has not been corrected for the
Ï„
mass.
[
g
] Here
A
≡
2
g
V
g
A
/(
g
2
V
+
g
2
A
).
[
h
] The value is for the sum of the charge states or particle/antiparticle
states indicated.
[
i
] This value is updated using the product of (i) the
Z
→
b b
fraction from this listing and (ii) the
b
-hadron fraction in an
unbiased sample of weakly decaying
b
-hadrons produced in
Z
-
decays provided by the Heavy Flavor Averaging Group (HFAG,
http://www.slac.stanford.edu/xorg/hfag/osc/PDG 2009/#FRACZ).
[
j
] See the
Z
Particle Listings for the
γ
energy range used in this measure-
ment.
[
k
] For
m
γ γ
= (60
±
5) GeV.
[
l
] The limits assume no invisible decays.
HTTP://PDG.LBL.GOV
Page 7
Created: 6/1/2009 14:31