Parameters of the Standard Model

Symbol

Description

Renormalization scheme (point)

Value

m_e

Electron mass

511 keV

m_μ

Muon mass

105.7 MeV

m_τ

Tau mass

1.78 GeV

m_u

Up quark mass

μ_MS = 2 GeV

1.9 MeV

m_d

Down quark mass

μ_MS = 2 GeV

4.4 MeV

m_s

Strange quark mass

μ_MS = 2 GeV

87 MeV

m_c

Charm quark mass

μ_MS = m_c

1.32 GeV

m_b

Bottom quark mass

μ_MS = m_b

4.24 GeV

m_t

Top quark mass

On-shell scheme

172.7 GeV

θ₁₂

CKM 12-mixing angle

q flavor mixing

13.1˚

θ₂₃

CKM 23-mixing angle

2.4˚

θ₁₃

CKM 13-mixing angle

0.2˚

δ₁₃

CKM CP-violating Phase

0.995

θ₁₂

PMNS 12-mixing angle

ν flavor mixing

33.6˚ ± 0.8˚

θ₂₃

PMNS 23-mixing angle

47.2˚ ± 4˚

θ₁₃

PMNS 13-mixing angle

8.5˚ ± 0.15˚

δ₁₃

PMNS CP-violating Phase

4.1 ± 0.75

g₁ or g'

U (1) gauge coupling

μ_MS = m_Z

0.357

g₂ or g

SU (2) gauge coupling

μ_MS = m_Z

0.652

g₃ or g_s

SU (3) gauge coupling

μ_MS = m_Z

1.221

Λ

crit. energy in SU (3)

220 MeV

c_gE0

additional log in col-coupling

0.69

θ_QCD

QCD vacuum angle

~0

v

Higgs vacuum expectation value

246 GeV

m_H

Higgs mass

125.36 ± 0.41 GeV

m_νe

electron neutrino mass

≤0.12 eV

m_νμ

mu neutrino mass

≤0.12 eV

m_ντ

tau neutrino mass

≤0.12 eV

${\alpha }_{em}$

fine-structure constant

1/137