D meson

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D Meson
Composition

D+: cd
D+
s
: cs
D0: cu / uc
D
s
: sc

D: dc
Statistics Bosonic
Interactions Strong, Weak, Electromagnetic, Gravitational
Symbol D+, D+
s
, D0, D
s
, D
Types 5
Mass D±: 1869.62±0.20 MeV/c2
D±
s
: 1968.47±0.33 MeV/c2
D0: 1864.84±0.17 MeV/c2
Electric charge D±,D±
s
: ±1 e
D0: 0 e

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.

Overview[edit]

The D mesons were discovered in 1976 by the Mark I detector at the Stanford Linear Accelerator Center.[2]

Since the D mesons are the lightest mesons containing a single charm quark (or antiquark), they must change the charm (anti)quark into an (anti)quark of another type to decay. Such transitions involve a change of the internal charm quantum number, and can take place only via the weak interaction. In D mesons, the charm quark preferentially changes into a strange quark via an exchange of a W particle, therefore the D meson preferentially decays into Ks and πs.[1]

List of D mesons[edit]

D mesons
Particle name Particle
symbol
Antiparticle
symbol
Quark
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 modes
D 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 modes
Strange D meson[6] D+
s
D
s
cs 1968.47±0.33 0 0 +1 +1 0 (5.00±0.07)×10−13 See D+
s
decay modes
D 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+ + π0
D 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[edit]

References[edit]

  1. ^ a b D Meson
  2. ^ http://www.kudryavtsev.staff.shef.ac.uk/phy466/charmed-mesons_files/charmed-mesons.ppt
  3. ^ C. Amsler et al.. (2008): Quark Model
  4. ^ C. Amsler et al.. (2008): Particle listings – D±
  5. ^ C. Amsler et al.. (2008): Particle listings – D0
  6. ^ N. Nakamura et al. (2010): Particle listings – D±
    s
  7. ^ C. Amsler et al.. (2008): Particle listings – D∗±(2010)
  8. ^ C. Amsler et al.. (2008): Particle listings – D∗0(2007)