b b MESONS
(including possibly non-q q states)
INSPIRE   JSON PDGID:
M049

Υ(1S)

IG(JPC) = 0(1) 
Υ(1S) MASS   9460.40±0.10 MeV 
 
Υ(1S) WIDTH   54.02±1.25 keV 
 
Mode  
Fraction (Γi / Γ) Scale Factor/
Conf. Level
P(MeV/c)  
Γ1 τ+τ   (2.60±0.10)% 4384
 
Γ2 e+e   (2.39±0.08)% 4730
 
Γ3 μ+μ   (2.48±0.04)% 4729
 
FOOTNOTES