Built-in Mathematica Symbol

ParticleData

ParticleData[name, "property"]
gives the specified property for a subatomic particle or family of particles with the specified name.

ParticleData[{name, q}, "property"]
gives the specified property for a version of the particle with charge q.

Typical forms of names for long-lived particles include "Electron", "Photon", "MuonNeutrino", "ElectronNeutrinoBar", "PiZero" and "OmegaMinus".

Generic names such as "PiMeson" can be used to refer to charge multiplets. "PiMinus" is equivalent to {"PiMeson", -1}.

Quarks are referred to as "UpQuark", "StrangeQuark", "BottomQuark", etc. Gauge bosons are "Gluon", "WBoson", "ZBoson", etc.

Distinct antiparticles are referred to by names that end in Bar, such as "KZeroBar".

ParticleData[] and ParticleData[All] give a list of all known particles in order of increasing mass.

	"BaryonNumber"	baryon number
	"Bottomness"	bottom number (b quark content)
	"Charm"	charm (c quark content)
	"CParity"	charge conjugation parity
	"GParity"	isospin parity
	"Hypercharge"	hypercharge
	"Isospin"	isospin
	"IsospinProjection"	isospin projection
	"LeptonNumber"	lepton number
	"Parity"	spin parity
	"Spin"	spin angular momentum
	"Strangeness"	strangeness
	"Topness"	top number (t quark content)

	"GFactor"	g factor
	"MeanSquareChargeRadius"	mean square charge radius in

	"Antiparticle"	antiparticle of the given particle
	"ChargeStates"	list of charges of particles in the same isospin multiplet
	"Excitations"	particles with the same internal quantum numbers
	"IsospinMultiplet"	list of particles in the same isospin multiplet

	"DecayModes"	list of observed decay modes and branching ratios
	"DecayType"	dominant decay type ("Strong", "Weak", ...)
	"FullDecayModes"	list of all decay modes, including unobserved ones
	"UnobservedDecayModes"	list of unobserved decay modes and upper bounds

Each decay mode is by default specified in the form {{f₁, f₂, f₃}, b} where the f_i are decay products, and b is the branching ratio.

In "FullDecayModes", branching ratios of unobserved modes are given as 0. with a precision corresponding to the measured upper bound.

	"FullSymbol"	standard particle symbol, including approximate mass
	"GenericFullSymbol"	standard particle symbol, with mass but not charge state
	"GenericSymbol"	standard particle symbol, excluding charge state
	"PDGNumber"	PDG Monte Carlo particle number
	"StandardName"	standard Mathematica name
	"Symbol"	standard particle symbol

ParticleData["class"] gives a list of particles in the specified class. ParticleData[name, "class"] gives True or False depending on whether the particle corresponding to name is in the specified class.

Basic classes of particles include: "Lepton", "Hadron", "GaugeBoson", "Quark", "Meson", "Baryon", "Stable", "LongLived" (stable for seconds), "Fermion", "Boson".

Specific classes of particles include: "UnflavoredMeson", "UnflavoredBaryon", "StrangeMeson" (meson with nonzero strangeness but zero charm, etc.), "StrangeBaryon", "CharmedMeson", "CharmedBaryon", "CCBarMeson", "StrangeCharmedMeson", "StrangeCharmedBaryon", "BottomMeson", etc.

ParticleData[name, "property", "ann"] gives various annotations associated with a property. Typical annotations include:

	"Description"	short textual description of the property
	"Interval"	uncertainty range given by Interval[...]
	"LongDescription"	longer textual description of the property
	"Note"	additional information about the property
	"Units"	units in which the value is given
	"UnitsName"	English name for the units used
	"UnitsNotation"	notation for the units used
	"UnitsStandardName"	Mathematica standard name for the units used