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List of Baryons Information

Baryons are the family of composite particle made of three quarks, as opposed to the mesons which are the family of composite particles made of one quark and one antiquark. Both baryons and mesons are part of the larger particle family comprising all particles made of quarks – the hadron. The term baryon is derived from the Greek βαρύς (barys), meaning "heavy", because at the time of their naming it was believed that baryons were characterized by having greater masses than other particles that were classed as matter.

Until a few years ago, it was believed that some experiments showed the existence of pentaquarks – "exotic" baryons made of four quarks and one antiquark.[1][2] The particle physics community as a whole did not view their existence as likely in 2006,[3] and in 2008, considered evidence to be overwhelmingly against the existence of the reported pentaquarks.[4]

Since baryons are composed of quarks, they participate in the strong interaction. Leptons on the other hand, are not composed of quarks and as such do not participate in the strong interaction. The most famous baryons are the protons and neutrons which make up most of the mass of the visible matter in the universe, whereas electrons (the other major component of atoms) are leptons. Each baryon has a corresponding antiparticle (antibaryon) where quarks are replaced by their corresponding antiquarks. For example, a proton is made of two up quarks and one down quark; and its corresponding antiparticle, the antiproton, is made of two up antiquarks and one down antiquark.

Contents

Lists of baryons

These lists detail all known and predicted baryons in total angular momentum J = 12 and J = 32 configurations with positive parity.

The symbols encountered in these lists are: I (isospin), J (total angular momentum), P (parity), u (up quark), d (down quark), s (strange quark), c (charm quark), b (bottom quark), Q (charge), B (baryon number), S (strangeness), C (charm), B′ (bottomness), as well as a wide array of subatomic particles (hover for name). (See the baryon article for a detailed explanation of these symbols.)

Antiparticles are not listed in the tables; however, they simply would have all quarks changed to antiquarks (and antiquarks changed to quarks), and Q, B, S, C, B′, would be of opposite signs. Particles with next to their names have been predicted by the Standard Model but not yet observed. Values in red have not been firmly established by experiments, but are predicted by the quark model and are consistent with the measurements.[5][6]

jp = 12+ baryons

JP = 12+ baryons
Particle name Symbol Quark content Rest mass (MeV/c2) I JP Q (e) S C B' Mean lifetime (s) Commonly decays to
nucleon/proton[7] p / p+ / N+ u u d 0938.272013 !938.272013±0.000023[a] 0.5 !12 0.5 !12+ 1 !+1 0 0 0 +10 !Stable[b] Unobserved
nucleon/neutron[8] n / n0 / N0 u d d 0939.565346 !939.565346±0.000023[a] 0.5 !12 0.5 !12+ 0 0 0 0 +2 !8.857±0.008×102[c] p+ + e− + ν e
Lambda[9] Λ0 u d s 1,115.683±0.006 0 0.5 !12+ 0 -1 !−1 0 0 -10.2 !2.631±0.020×10−10 p+ + π− or n0 + π0
charmed Lambda[10] Λ+ c u d c 2,286.46±0.14 0 0.5 !12+ 1 !+1 0 1 !+1 0 -13.2 !2.00±0.06×10−13 See Λ+ c decay modes
bottom Lambda[11] Λ0 b u d b 5,620.2±1.6 0 0.5 !12+ 0 0 0 -1 !−1 -12.3 !1.391+0.038 −0.037×10−12 See Λ0 b decay modes
Sigma[12] Σ+ u u s 1,189.37±0.07 1 0.5 !12+ 1 !+1 -1 !−1 0 0 -11.1 !8.018±0.026×10−11 p+ + π0 or

n0 + π+

Sigma[13] Σ0 u d s 1,192.642±0.024 1 0.5 !12+ 0 -1 !−1 0 0 -20.1 !7.4±0.7×10−20 Λ0 + γ
Sigma[14] Σ− d d s 1,197.449±0.030 1 0.5 !12+ -1 !−1 -1 !−1 0 0 -10.4 !1.479±0.011×10−10 n0 + π−
charmed Sigma[15] Σ++ c u u c 2,454.02±0.18 1 0.5 !12+ 2 !+2 0 1 !+1 0 -22.2 !2.95±0.40×10−22[d] Λ+ c + π+
charmed Sigma[15] Σ+ c u d c 2,452.9±0.4 1 0.5 !12+ 1 !+1 0 1 !+1 0 -22.3 !>1.4×10−22[d] Λ+ c + π0
charmed Sigma[15] Σ0 c d d c 2,453.76±0.18 1 0.5 !12+ 0 0 1 !+1 0 -22.1 !3.0±0.5×10−22[d] Λ+ c + π−
bottom Sigma[16] Σ+ b u u b 5,807.8±2.7 1 0.5 !12+ 1 !+1 0 0 -1 !−1 Unknown Λ0 b + π+
bottom Sigma Σ0 b u d b Unknown 1 0.5 !12+ 0 0 0 -1 !−1 Unknown Unknown
bottom Sigma[16] Σ− b d d b 5,815.2±2.0 1 0.5 !12+ -1 !−1 0 0 -1 !−1 Unknown Λ0 b + π−
Xi[17] Ξ0 u s s 1,314.86±0.20 0.5 !12 0.5 !12+ 0 -2 !−2 0 0 -10.1 !2.90±0.09×10−10 Λ0 + π0
Xi[18] Ξ− d s s 1,321.71±0.07 0.5 !12 0.5 !12+ -1 !−1 -2 !−2 0 0 -10.3 !1.639±0.015×10−10 Λ0 + π−
charmed Xi[19] Ξ+ c u s c 2,467.8+0.4 −0.6 0.5 !12 0.5 !12+ 1 !+1 -1 !−1 1 !+1 0 -13.1 !4.42±0.26×10−13 See Ξ+ c decay modes
charmed Xi[20] Ξ0 c d s c 2,470.88+0.34 −0.80 0.5 !12 0.5 !12+ 0 -1 !−1 1 !+1 0 -13.3 !1.12+0.13 −0.10×10−13 See Ξ0 c decay modes
charmed Xi prime[21] Ξ′+ c u s c 2,575.6±3.1 0.5 !12 0.5 !12+ 1 !+1 -1 !−1 1 !+1 0 Unknown Ξ+ c + γ (seen)
charmed Xi prime[22] Ξ′0 c d s c 2,577.9±2.9 0.5 !12 0.5 !12+ 0 -1 !−1 1 !+1 0 Unknown Ξ0 c + γ (seen)
double charmed Xi[e] Ξ++ cc u c c Unknown 0.5 !12 0.5 !12+ 2 !+2 0 2 !+2 0 Unknown Unknown
double charmed Xi[e][23] Ξ+ cc d c c 3,518.9±0.9[e] 0.5 !12 0.5 !12+ 1 !+1 0 2 !+2 0 -14.2 !<3.3×10−14[e] Λ+ c + K− + π+[e] or p+ + D+ + K−[e]
bottom Xi[24] (or Cascade B) Ξ0 b u s b Unknown 0.5 !12 0.5 !12+ 0 -1 !−1 0 -1 !−1 -12.2 !1.49+0.19 −0.18×10−12 See Ξ b decay modes
bottom Xi[24] (or Cascade B) Ξ− b d s b 5,790.5±2.7 0.5 !12 0.5 !12+ -1 !−1 -1 !−1 0 -1 !−1 -12.1 !1.56+0.29 −0.27×10−12 See Ξ b decay modes (Ξ− + J/ψ was also seen)
bottom Xi prime Ξ′0 b u s b Unknown 0 0.5 !12+ 0 -1 !−1 0 -1 !−1 Unknown Unknown
bottom Xi prime Ξ′− b d s b Unknown 0 0.5 !12+ -1 !−1 -1 !−1 0 -1 !−1 Unknown Unknown
double bottom Xi Ξ0 bb u b b Unknown 0.5 !12 0.5 !12+ 0 0 0 -2 !−2 Unknown Unknown
double bottom Xi Ξ− bb d b b Unknown 0.5 !12 0.5 !12+ -1 !−1 0 0 -2 !−2 Unknown Unknown
charmed bottom Xi Ξ+ cb u c b Unknown 0.5 !12 0.5 !12+ 1 !+1 0 1 !+1 -1 !−1 Unknown Unknown
charmed bottom Xi Ξ0 cb d c b Unknown 0.5 !12 0.5 !12+ 0 0 1 !+1 -1 !−1 Unknown Unknown
charmed bottom Xi prime Ξ′+ cb u c b Unknown 0 0.5 !12+ 1 !+1 0 1 !+1 -1 !−1 Unknown Unknown
charmed bottom Xi prime Ξ′0 cb d c b Unknown 0 0.5 !12+ 0 0 1 !+1 -1 !−1 Unknown Unknown
charmed Omega[25] Ω0 c s s c 2,695.2±1.7 0 0.5 !12+ 0 -2 !−2 1 !+1 0 -14.1 !6.9±1.2×10−14 See Ω0 c decay modes
bottom Omega[26] Ω− b s s b 6,165±23 0 0.5 !12+ -1 !−1 -2 !−2 0 -1 !−1 -12.4 !1.13+0.55 −0.42×10−12 (Ω− + J/ψ seen)
double charmed Omega Ω+ cc s c c Unknown 0 0.5 !12+ 1 !+1 -1 !−1 2 !+2 0 Unknown Unknown
charmed bottom Omega Ω0 cb s c b Unknown 0 0.5 !12+ 0 -1 !−1 1 !+1 -1 !−1 Unknown Unknown
charmed bottom Omega prime Ω′0 cb s c b Unknown 0 0.5 !12+ 0 -1 !−1 1 !+1 -1 !−1 Unknown Unknown
double bottom Omega Ω− bb s b b Unknown 0 0.5 !12+ -1 !−1 -1 !−1 0 -2 !−2 Unknown Unknown
double charmed bottom Omega Ω+ ccb c c b Unknown 0 0.5 !12+ 1 !+1 0 2 !+2 -1 !−1 Unknown Unknown
charmed double bottom Omega Ω0 cbb c b b Unknown 0 0.5 !12+ 0 0 1 !+1 -2 !−2 Unknown Unknown

^ Particle has not yet been observed. [a] ^ The masses of the proton and neutron are known with much better precision in atomic mass units (u) than in MeV/c2, due to the relatively poorly known value of the elementary charge. In atomic mass unit, the mass of the proton is 1.007 276 466 88(13) u while that of the neutron is 1.008 664 915 60(55) u. [b] ^ At least 1035 years. See proton decay. [c] ^ For free neutrons; in most common nuclei, neutrons are stable. [d] ^ PDG reports the resonance width (Γ). Here the conversion τ = ħΓ is given instead. [e] ^ Some controversy exists about this data.[23]

jp = 32+ baryons

JP = 32+ baryons
Particle name Symbol Quark content Rest mass (MeV/c2) I JP Q (e) S C B' Mean lifetime (s) Commonly decays to
Delta[27] Δ++(1232) u u u 1,232±1 1.5 !32 1.5 !32+ 2 !+2 0 0 0 -24.1 !5.58±0.09×10−24[h] p+ + π+
Delta[27] Δ+(1232) u u d 1,232±1 1.5 !32 1.5 !32+ 1 !+1 0 0 0 -24.2 !5.58±0.09×10−24[h] π+ + n0 or

π0 + p+

Delta[27] Δ0(1232) u d d 1,232±1 1.5 !32 1.5 !32+ 0 0 0 0 -24.3 !5.58±0.09×10−24[h] π0 + n0 or

π− + p+

Delta[27] Δ−(1232) d d d 1,232±1 1.5 !32 1.5 !32+ -1 !−1 0 0 0 -24.4 !5.58±0.09×10−24[h] π− + n0
Sigma[28] Σ∗+(1385) u u s 1,382.8±0.4 1 1.5 !32+ 1 !+1 -1 !−1 0 0 -23.6 !1.84±0.04×10−23[h] Λ0 + π+ or

Σ+ + π0 or Σ0 + π+

Sigma[28] Σ∗0(1385) u d s 1,383.7±1.0 1 1.5 !32+ 0 -1 !−1 0 0 -23.7 !1.8±0.3×10−23[h] Λ0 + π0 or

Σ+ + π− or Σ0 + π0

Sigma[28] Σ∗−(1385) d d s 1,387.2±0.5 1 1.5 !32+ -1 !−1 -1 !−1 0 0 -23.8 !1.67±0.09×10−23[h] Λ0 + π− or

Σ0 + π− or Σ− + π0 or

charmed Sigma[29] Σ∗++ c(2520) u u c 2,518.4±0.6 1 1.5 !32 + 2 !+2 0 1 !+1 0 -23.3 !4.4±0.6×10−23[h] Λ+ c + π+
charmed Sigma[29] Σ∗+ c(2520) u d c 2,517.5±2.3 1 1.5 !32 + 1 !+1 0 1 !+1 0 -23.5 !>3.9×10−23[h] Λ+ c + π0
charmed Sigma[29] Σ∗0 c(2520) d d c 2,518.0±0.5 1 1.5 !32 + 0 0 1 !+1 0 -23.4 !4.1±0.5×10−23[h] Λ+ c + π−
bottom Sigma[30] Σ∗+ b u u b 5,829.0±3.4 1 1.5 !32 + 1 !+1 0 0 -1 !−1 Unknown Λ0 b + π+
bottom Sigma Σ∗0 b u d b Unknown 1 1.5 !32 + 0 0 0 -1 !−1 Unknown Unknown
bottom Sigma[30] Σ∗− b d d b 5,836.4±2.8 1 1.5 !32 + -1 !−1 0 0 -1 !−1 Unknown Λ0 b + π−
Xi[31] Ξ∗0(1530) u s s 1,531.80±0.32 0.5 !12 1.5 !32+ 0 -2 !−2 0 0 -23.1 !7.2±0.4×10−23[h] Ξ0 + π0 or

Ξ− + π+

Xi[31] Ξ∗−(1530) d s s 1,535.0±0.6 0.5 !12 1.5 !32+ -1 !−1 -2 !−2 0 0 -23.2 !6.7+1.1 −1.2×10−23[h] Ξ0 + π− or

Ξ− + π0

charmed Xi[32] Ξ∗+ c(2645) u s c 2,645.9+0.5 −0.6 0.5 !12 1.5 !32 + 1 !+1 -1 !−1 1 !+1 0 -22.1 !>2.1×10−22[h] Ξ+ c + π0 (seen)
charmed Xi[32] Ξ∗0 c(2645) d s c 2,645.9±0.5 0.5 !12 1.5 !32 + 0 -1 !−1 1 !+1 0 -22.2 !>1.2×10−22[h] Ξ+ c + π− (seen)
double charmed Xi Ξ∗++ cc u c c Unknown 0.5 !12 1.5 !32 + 2 !+2 0 2 !+2 0 Unknown Unknown
double charmed Xi Ξ∗+ cc d c c Unknown 0.5 !12 1.5 !32 + 1 !+1 0 2 !+2 0 Unknown Unknown
bottom Xi Ξ∗0 b u s b Unknown 0.5 !12 1.5 !32 + 0 -1 !−1 0 -1 !−1 Unknown Unknown
bottom Xi Ξ∗− b d s b Unknown 0.5 !12 1.5 !32 + -1 !−1 -1 !−1 0 -1 !−1 Unknown Unknown
double bottom Xi Ξ∗0 bb u b b Unknown 0.5 !12 1.5 !32 + 0 0 0 -2 !−2 Unknown Unknown
double bottom Xi Ξ∗− bb d b b Unknown 0.5 !12 1.5 !32 + -1 !−1 0 0 -2 !−2 Unknown Unknown
charmed bottom Xi Ξ∗+ cb u c b Unknown 0.5 !12 1.5 !32 + 1 !+1 0 1 !+1 -1 !−1 Unknown Unknown
charmed bottom Xi Ξ∗0 cb d c b Unknown 0.5 !12 1.5 !32 + 0 0 1 !+1 -1 !−1 Unknown Unknown
Omega[33] Ω− s s s 1,672.45±0.29 0 1.5 !32+ -1 !−1 -3 !−3 0 0 -11.1 !8.21±0.11×10−11[h] Λ0 + K− or Ξ0 + π− or

Ξ− + π0

charmed Omega[34] Ω∗0 c(2770) s s c 2,765.9±1.5 0 1.5 !32 + 0 -2 !−2 1 !+1 0 Unknown Ω0 c + γ
bottom Omega Ω∗− b s s b Unknown 0 1.5 !32 + -1 !−1 -2 !−2 0 -1 !−1 Unknown Unknown
double charmed Omega Ω∗+ cc s c c Unknown 0 1.5 !32 + 1 !+1 -1 !−1 2 !+2 0 Unknown Unknown
charmed bottom Omega Ω∗0 cb s c b Unknown 0 1.5 !32 + 0 -1 !−1 1 !+1 -1 !−1 Unknown Unknown
double bottom Omega Ω∗− bb s b b Unknown 0 1.5 !32 + -1 !−1 -1 !−1 0 -2 !−2 Unknown Unknown
triple charmed Omega Ω++ ccc c c c Unknown 0 1.5 !32 + 2 !+2 0 3 !+3 0 Unknown Unknown
double charmed bottom Omega Ω∗+ ccb c c b Unknown 0 1.5 !32 + 1 !+1 0 2 !+2 -1 !−1 Unknown Unknown
charmed double bottom Omega Ω∗0 cbb c b b Unknown 0 1.5 !32 + 0 0 1 !+1 -2 !−2 Unknown Unknown
triple bottom Omega Ω− bbb b b b Unknown 0 1.5 !32 + -1 !−1 0 0 -3 !−3 Unknown Unknown

^ Particle has not yet been observed. [h] ^ PDG reports the resonance width (Γ). Here the conversion τ = ħΓ is given instead.

Baryon resonance particles

This short table gives the name, the quantum numbers (where known), and the status of baryons as given by Nakamura.[35] Baryon resonance particles are subatomic particles with short half life and high mass, given in brackets. For N, Δ and Ξ resonances, the πN partial wave is indicated by the symbol L2I,2J, where L is the orbital angular momentum (S, P, D, F, I, J, K, ...), I is the isospin and J is the total angular momentum. For Λ and Σ resonances, the partial wave is labelled LI,2J.

Baryon Resonance Particles
Nucleons Δ particles Λ particles Σ particles Ξ and Ω particles Charmed particles
p P11 **** Δ(1232) P33 **** Λ P01 **** Σ+ P11 **** Ξ0 P11 **** Λ+c ****
n P11 **** Δ(1600) P33 *** Λ(1405) S01 **** Σ0 P11 **** Ξ P11 **** Λc(2595)+ ***
N(1440) P11 **** Δ(1620) S31 **** Λ(1520) D03 **** Σ P11 **** Ξ(1530) P13 **** Λc(2625)+ ***
N(1520) D13 **** Δ(1700) D33 **** Λ(1600) P01 *** Σ(1385) P13 **** Ξ(1620) * Λc(2765)+ *
N(1535) S11 **** Δ(1750) P31 * Λ(1670) S01 **** Σ(1480) * Ξ(1690) *** Λc(2880)+ ***
N(1650) S11 **** Δ(1900) S31 ** Λ(1690) D03 **** Σ(1560) ** Ξ(1820) D13 *** Λc(2940)+ ***
N(1675) D15 **** Δ(1905) F35 **** Λ(1800) S01 *** Σ(1580) D13 * Ξ(1950) ***
N(1680) F15 **** Δ(1910) P31 **** Λ(1810) P01 *** Σ(1620) S11 ** Ξ(2030) *** Σc(2455) ****
N(1700) D13 *** Δ(1920) P33 *** Λ(1820) F05 **** Σ(1660) P11 *** Ξ(2120) * Σc(2520) ***
N(1710) P11 *** Δ(1930) D35 *** Λ(1830) D05 **** Σ(1670) D13 **** Ξ(2250) ** Σc(2800) ***
N(1720) P13 **** Δ(1940) D33 * Λ(1890) P03 **** Σ(1690) ** Ξ(2370) **
N(1900) P13 ** Δ(1950) F37 **** Λ(2000) * Σ(1750) S11 *** Ξ(2500) * Ξ+c ***
N(1990) F17 ** Δ(2000) F35 ** Λ(2020) F07 * Σ(1770) P11 * Ξ0c ***
N(2000) F15 ** Δ(2150) S31 * Λ(2100) G07 **** Σ(1775) D15 **** Ω **** Ξ′c+ ***
N(2080) D13 ** Δ(2200) G37 * Λ(2110) F05 *** Σ(1840) P13 * Ω(2250) *** Ξ′c0 ***
N(2090) S11 * Δ(2300) H39 ** Λ(2325) D03 * Σ(1880) P11 ** Ω(2380) ** Ξc(2645) ***
N(2100) P11 * Δ(2350) D35 * Λ(2350) H09 *** Σ(1915) F15 **** Ω(2470) ** Ξc(2790) ***
N(2190) G17 **** Δ(2390) F37 * Λ(2585) ** Σ(1940) D13 *** Ξc(2815) ***
N(2200) D15 ** Δ(2400) G39 ** Σ(2000) S11 * Ξc(2930) *
N(2220) H19 **** Δ(2420) H3,11 **** Σ(2030) F17 **** Ξc(2980) ***
N(2250) G19 **** Δ(2750) I3,13 ** Σ(2070) F15 * Ξc(3055) **
N(2600) I1,11 *** Δ(2950) K3,15 ** Σ(2080) P13 ** Ξc(3080) ***
N(2700) K1,13 ** Σ(2100) G17 * Ξc(3123) *
Σ(2250) ***
Σ(2455) ** Ω0c ***
Σ(2620) ** Ωc(2270)0 ***
Σ(3000) *
Σ(3170) * Ξ+cc *
**** Existence is certain, and properties are at least fairly well explored.
*** Existence ranges from fairly certain to certain, but further confirmation is desirable and/or quantum numbers, branching fractions, etc. are not well determined.
** Evidence of existence is only fair.
* Evidence of existence is poor.

See also

Book: Hadronic Matter

Book: Particles of the Standard Model

Wikipedia books are collections of articles that can be downloaded or ordered in print.

References

  1. ^ H. Muir (2003)
  2. ^ K. Carter (2003)
  3. ^ W.-M. Yao et al. (2006): Particle listings – Positive Theta
  4. ^ K. Nakamura et al. (2010): Pentaquarks
  5. ^ K. Nakamura et al. (2010): Particle summary tables – Baryons
  6. ^ J.G. Körner et al. (1994)
  7. ^ K. Nakamura et al. (2010): Particle listings – p+
  8. ^ K. Nakamura et al. (2010): Particle listings – n0
  9. ^ K. Nakamura et al. (2010): Particle listings – Λ
  10. ^ K. Nakamura et al. (2010): Particle listings – Λ c
  11. ^ K. Nakamura et al. (2010): Particle listings – Λ b
  12. ^ K. Nakamura et al. (2010): Particle listings – Σ+
  13. ^ K. Nakamura et al. (2010): Particle listings – Σ0
  14. ^ K. Nakamura et al. (2010): Particle listings – Σ−
  15. ^ a b c K. Nakamura et al. (2010): Particle listings – Σ c
  16. ^ a b K. Nakamura et al. (2010): Particle listings – Σ b
  17. ^ K. Nakamura et al. (2010): Particle listings – Ξ0
  18. ^ K. Nakamura et al. (2010): Particle listings – Ξ−
  19. ^ K. Nakamura et al. (2010): Particle listings – Ξ+ c
  20. ^ K. Nakamura et al. (2010): Particle listings – Ξ0 c
  21. ^ K. Nakamura et al. (2010): Particle listings – Ξ′+ c
  22. ^ K. Nakamura et al. (2010): Particle listings – Ξ′0 c
  23. ^ a b K. Nakamura et al. (2010): Particle listings – Ξ+ cc
  24. ^ a b K. Nakamura et al. (2010): Particle listings – Ξ b
  25. ^ K. Nakamura et al. (2010): Particle listings – Ω0 c
  26. ^ K. Nakamura et al. (2010): Particle listings – Ω− b
  27. ^ a b c d K. Nakamura et al. (2010): Particle listings – Δ(1232)
  28. ^ a b c K. Nakamura et al. (2010): Particle listings – Σ(1385)
  29. ^ a b c K. Nakamura et al. (2010): Particle listings – Σ c(2520)
  30. ^ a b K. Nakamura et al. (2010): Particle listings – Σ∗ b
  31. ^ a b K. Nakamura et al. (2010): Particle listings – Ξ(1530)
  32. ^ a b K. Nakamura et al. (2010): Particle listings – Ξ c(2645)
  33. ^ K. Nakamura et al. (2010): Particle listings – Ω−
  34. ^ K. Nakamura et al. (2010): Particle listings – Ω0 c(2770)
  35. ^ http://pdg.lbl.gov/2010/tables/rpp2010-qtab-baryons.pdf

Bibliography

Further reading

External links

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