- D meson
-
The D mesons are the lightest particle containing charm quarks. They are often studied to gain knowledge on the weak interaction. [1] The strange D mesons (Ds) were called the "F mesons" prior to 1986.
Contents
Overview
The D mesons were discovered in 1976 during the Mark I experiments at the Stanford Linear Accelerator Center [2]
Since the D meson is the lightest meson containing a charm quark, it must change the charm quark into another quark to decay. Quark transmutations take place via the weak interaction. In D mesons, the charm quark changes into a strange quark with a W particle and then decays into Ks and πs. [1]
List of D mesons
D mesons Particle name Particle
symbolAntiparticle
symbolQuark
content[3]Rest mass (MeV/c2) IG JPC S C B' Mean lifetime (s) Commonly decays to
(>5% of decays)
D meson[4] D+ D− cd 1,869.62 ± 0.20 1⁄2 0− 0 +1 0 1.040 ± 0.007 × 10−12 See D+
decay modesD meson[5] D0 D0 cu 1,864.84 ± 0.17 1⁄2 0− 0 +1 0 4.101 ± 0.015 × 10−13 See D0
decay modesStrange D meson[6] D+
sD−
scs 1,968.47±0.33 0 0− +1 +1 0 5.00±0.07×10−13 See D+
s decay modesD meson[7] D∗+
(2010)D∗−
(2010)cd 2,010.27.62 ± 0.17 1⁄2 1− 0 +1 0 6.9 ± 1.9 × 10−21[a] D0
+ π+
or
D+
+ π0D meson[8] D∗0
(2007)D∗0
(2007)cu 2,006.97 ± 0.19 1⁄2 1− 0 +1 0 >3.1 × 10−22[a] D0
+ π0
or
D0
+ γ[a] ^ PDG reports the resonance width (Γ). Here the conversion τ = ħ⁄Γ is given instead.
See also
References
- ^ a b D Meson
- ^ http://www.kudryavtsev.staff.shef.ac.uk/phy466/charmed-mesons_files/charmed-mesons.ppt
- ^ C. Amsler et al.. (2008): Quark Model
- ^ C. Amsler et al.. (2008): Particle listings – D±
- ^ C. Amsler et al.. (2008): Particle listings – D0
- ^ N. Nakamura et al. (2010): Particle listings – D±
s - ^ C. Amsler et al.. (2008): Particle listings – D∗±
(2010) - ^ C. Amsler et al.. (2008): Particle listings – D∗0
(2007)
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