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Encyclopedia > Sigma (particle)
Sigma Baryon
Classification
Subatomic particle
Fermion, Hadron
Baryon
Sigma
Properties
Symbol: Σ + Σ0 Σ
Mass (MeV/c2): 1189.33±0.07 1192.642±0.024 1197.449±0.030
Electric Charge: +e 0 -e
I(Iz), JP: 1(+1), ½+ 1(0), ½+ 1(-1), ½+
Quark Composition: uus uds dds

Sigma particles are baryons composed of one strange quark and a combination of up and down quarks, arranged in an isospin 1 state. These are hyperons. A subatomic particle is a particle smaller than an atom: it may be elementary or composite. ... In particle physics, fermions are particles with half-integer spin, such as protons and electrons. ... A hadron, in particle physics, is a subatomic particle which experiences the nuclear force. ... Combinations of three u, d or s-quarks with a total spin of 3/2 form the so-called baryon decuplet. ... An electronvolt (symbol: eV) is the amount of energy gained by a single unbound electron when it falls through an electrostatic potential difference of one volt. ... -1... Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. ... The elementary charge (symbol e or sometimes q) is the electric charge carried by a single proton, or equivalently, the negative of the electric charge carried by a single electron. ... Isospin (isotopic spin, isobaric spin) is a physical quantity which is mathematically analogous to spin. ... In physics, spin refers to the angular momentum intrinsic to a body, as opposed to orbital angular momentum, which is the motion of its center of mass about an external point. ... In physics, a parity transformation (also called parity inversion) is the simultaneous flip in the sign of all spatial coordinates: A 3×3 matrix representation of P would have determinant equal to –1, and hence cannot reduce to a rotation. ... The six flavours of quarks and their most likely decay modes. ... Combinations of three u, d or s-quarks with a total spin of 3/2 form the so-called baryon decuplet. ... In particle physics, a hyperon is any subatomic particle which is a baryon (and hence a hadron and a fermion) with non-zero strangeness, but with zero charm and zero bottomness. ...


The symbol Σ is also used for similar heavier particles containing charm and bottom quarks. They are, by definition, not hyperons. The charm quark is a second-generation quark with a charge of +(2/3)e. ... The bottom quark is a third-generation quark with a charge of -(1/3)e. ... In particle physics, a hyperon is any subatomic particle which is a baryon (and hence a hadron and a fermion) with non-zero strangeness, but with zero charm and zero bottomness. ...


See also

Baryon decuplet: Spin=3/2 Baryon octet: Spin=1/2 This is a list of baryons. ...

References

protons and neutrons"], Fermilab Today, 2006-10-23 For the Manfred Mann album, see 2006 (album). ... October 23 is the 296th day of the year (297th in leap years) in the Gregorian calendar. ...

 v  d  e 
Particles in physics
Elementary particles (Quarks, Leptons, Gauge bosons)
Quarks : u · d · s · c · b · t Leptons : e- · e+ · μ · τ · νe · νμ · ντ Gauge bosons : γ · g · W± · Z0
Composite particles ( Baryons, Mesons, Hyperons)
Baryons/Hyperons : p · n · Δ · Λ · Σ · Ξ · Ω Mesons : π · K · ρ · J/ψ · Υ
Quasiparticles
Phonon · Exciton · Plasmon · Polariton · Polaron · Magnon
Hypothetical particles
Higgs boson · Graviton · Tetraquark · Pentaquark · Goldstone boson · Neutralino

 
 

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