D meson

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D meson
Composition

  • D+
    :
    c

    d

  • D−
    :
    d

    c

  • D0
    :
    c

    u

  • D0
    :
    u

    c

  • D+
    s    :
    c

    s

  • D−
    s    :
    s

    c
StatisticsBosonic
FamilyMesons
InteractionsStrong, weak, electromagnetic, gravitational
Symbol
D+
,
D−
,
D0
,
D0
,
D+
s,
D−
s
Antiparticle

  • D+
    :
    D−

  • D0
    :
    D0

  • D+
    s    :
    D−
    s
DiscoveredSLAC (1976)
Mass

  • D±
    : 1869.62±0.20 MeV/c2

  • D0
    ,
    D0
    : 1864.84±0.17 MeV/c2

  • D±
    s    : 1968.47±0.33 MeV/c2
Mean lifetime

  • D±
    : (1.040±0.007)×10−12

  • D0
    ,
    D0
    : (4.101±0.015)×10−13

  • D±
    s    : (5.00±0.07)×10−13
Electric charge

  • D±
    ,
    D±
    s    : ±1 e

  • D0
    ,
    D0
    : 0 e
Spin0
Strangeness

  • D±
    ,
    D0
    ,
    D0
    : 0

  • D±
    s    : ±1
Charm+1
Isospin

  • D+
    ,
    D0
    : +1⁄2

  • D−
    ,
    D0
    : -1⁄2

  • D±
    s    : 0
Parity-1

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.[2]

Overview[]

The D mesons were discovered in 1976 by the Mark I detector at the Stanford Linear Accelerator Center.[3]

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 kaons (
K
) and pions (
π
).[1]

List of D mesons[]

D mesons
Particle
name 		Particle
symbol 		Antiparticle
symbol 		Quark
content[4] 		Rest mass (MeV/c2) IG JPC S C B' Mean lifetime (s) Commonly decays to
(>5% of decays)
D meson[5]
D+
D−
c

d
 		1869.62±0.20 1/2 0− 0 +1 0 (1.040±0.007)×10−12 See
D+
 decay modes
D meson[6]
D0
D0
c

u
 		1864.84±0.17 1/2 0− 0 +1 0 (4.101±0.015)×10−13 See
D0
 decay modes
Strange D meson[7]
D+
s
D−
s
c

s
 		1968.47±0.33 0 0− +1 +1 0 (5.00±0.07)×10−13 See
D+
s decay modes
Excited D meson[8]
D∗+
(2010)
D∗−
(2010)
c

d
 		2010.27±0.17 1/2 1− 0 +1 0 (6.9±1.9)×10−21[a]
D0
 +
π+
 or

D+
 +
π0
Excited D meson[9]
D∗0
(2007)
D∗0
(2007)
c

u
 		2006.97±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.


D
–
D
 oscillations[]

In 2021, and with a significance of more than seven standard deviations, it was confirmed that the neutral
D0
 meson spontaneously transforms into its own antiparticle and back. This phenomenon is called flavor oscillation and was prior known to exist in the neutral B mesons. [10]

See also[]

References[]

  1. ^ Jump up to: a b D Meson
  2. ^ Wohl, C. G. "1984 Review of Particle Physics" (PDF). Reviews of Modern Physics. Particle Data Group. 56 (2, Part II). doi:10.1103/RevModPhys.56.S1.
  3. ^ http://www.kudryavtsev.staff.shef.ac.uk/phy466/charmed-mesons_files/charmed-mesons.ppt[permanent dead link]
  4. ^ C. Amsler et al.. (2008): Quark Model
  5. ^ C. Amsler et al.. (2008): Particle listings –
    D±
  6. ^ C. Amsler et al.. (2008): Particle listings –
    D0
  7. ^ N. Nakamura et al.. (2010): Particle listings –
    D±
    s
  8. ^ C. Amsler et al.. (2008): Particle listings –
    D∗±
    (2010)
  9. ^ C. Amsler et al.. (2008): Particle listings –
    D∗0
    (2007)
  10. ^ "Observation of the mass difference between neutral charm-meson eigenstates". arxiv.org. 2106.03744.


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