rpp2010-sum-quarks - Citation K Nakamura et al(Particle...

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Unformatted text preview: Citation: K. Nakamura et al. (Particle Data Group), JPG 37 , 075021 (2010) (URL: http://pdg.lbl.gov) QUARKS QUARKS QUARKS QUARKS The u-, d-, and s-quark masses are estimates of so-called “current- quark masses,” in a mass-independent subtraction scheme such as MS at a scale μ ≈ 2 GeV. The c- and b-quark masses are the “running” masses in the MS scheme. For the b-quark we also quote the 1S mass. These can be different from the heavy quark masses obtained in potential models. u I ( J P ) = 1 2 ( 1 2 + ) m u = 1 . 7–3 . 3 MeV Charge = 2 3 e I z = + 1 2 m u / m d = 0 . 35–0 . 60 d I ( J P ) = 1 2 ( 1 2 + ) m d = 4 . 1–5 . 8 MeV Charge = − 1 3 e I z = − 1 2 m s / m d = 17 to 22 m = ( m u + m d )/2 = 3 . 0–4 . 8 MeV s I ( J P ) = 0( 1 2 + ) m s = 101 + 29 − 21 MeV Charge = − 1 3 e Strangeness = − 1 m s / (( m u + m d )/2) = 22 to 30 c I ( J P ) = 0( 1 2 + ) m c = 1 . 27 + 0 . 07 − . 09 GeV Charge = 2 3 e Charm = +1 b I ( J P ) = 0( 1 2 + ) Charge = − 1 3 e Bottom =...
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rpp2010-sum-quarks - Citation K Nakamura et al(Particle...

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