Enum RuleKind 

pub enum RuleKind {
    Parity,
    Isospin,
    IsospinProjection,
    CParity,
    GParity,
    Charge,
    Strangeness,
    Charm,
    Bottomness,
    Topness,
    BaryonNumber,
    ElectronLeptonNumber,
    MuonLeptonNumber,
    TauLeptonNumber,
    LeptonNumber,
    IdenticalParticleSymmetry,
    ConventionalMesonJpc,
}

A conservation, symmetry, or classification rule that can be applied to a two-body decay.

Variants

Parity

Enforce intrinsic parity conservation.

For a two-body final state this checks $P_\text{parent} = P_a P_b (-1)^L$.

Isospin

Enforce total isospin coupling.

This checks whether the two daughter isospins can couple to the parent isospin: $I_\text{parent} \in |I_a - I_b|, \ldots, I_a + I_b$.

IsospinProjection

Enforce conservation of the isospin projection $I_3$.

This checks $I_{3,\text{parent}} = I_{3,a} + I_{3,b}$.

CParity

Enforce charge-conjugation parity conservation when applicable.

This is only meaningful for states with a defined $C$ eigenvalue and final states that can be interpreted as $C$ eigenstates, such as suitable particle-antiparticle combinations.

GParity

Enforce G-parity conservation when applicable.

This is mainly useful for light-quark isospin multiplets where $G$-parity is defined. It should not be enabled blindly for arbitrary hadrons.

Charge

Enforce electric charge conservation.

This checks $Q_\text{parent} = Q_a + Q_b$.

Strangeness

Enforce strangeness conservation.

This checks $S_\text{parent} = S_a + S_b$.

Strong and electromagnetic interactions conserve strangeness; weak interactions generally do not.

Charm

Enforce charm conservation.

This checks $C_\text{parent} = C_a + C_b$, where $C$ here denotes charm quantum number, not charge conjugation.

Bottomness

Enforce bottomness conservation.

This checks $B'_\text{parent} = B'_a + B'_b$, where $B'$ denotes bottomness, not baryon number.

Topness

Enforce topness conservation.

This checks $T_\text{parent} = T_a + T_b$.

BaryonNumber

Enforce baryon-number conservation.

This checks $B_\text{parent} = B_a + B_b$.

ElectronLeptonNumber

Enforce electron-family lepton-number conservation.

This checks $L_e(\text{parent}) = L_e(a) + L_e(b)$.

MuonLeptonNumber

Enforce muon-family lepton-number conservation.

This checks $L_\mu(\text{parent}) = L_\mu(a) + L_\mu(b)$.

TauLeptonNumber

Enforce tau-family lepton-number conservation.

This checks $L_\tau(\text{parent}) = L_\tau(a) + L_\tau(b)$.

LeptonNumber

Enforce total lepton-number conservation.

This checks $L_\text{parent} = L_a + L_b$, where $L = L_e + L_\mu + L_\tau$.

This is independent of the individual lepton-family checks. If both this and the family-specific checks are enabled, all enabled checks must pass.

IdenticalParticleSymmetry

Enforce exchange-symmetry constraints for identical final-state particles when enough information is available.

At minimum, this is useful for cases such as identical spin-zero bosons, where only even $L$ is allowed.

ConventionalMesonJpc

Optional diagnostic/classification rule, not part of strong-decay conservation.

Trait Implementations

impl Clone for RuleKind

fn clone(&self) -> RuleKind

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for RuleKind

impl Debug for RuleKind

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for RuleKind

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for RuleKind

impl Hash for RuleKind

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for RuleKind

fn cmp(&self, other: &RuleKind) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for RuleKind

fn eq(&self, other: &RuleKind) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for RuleKind

fn partial_cmp(&self, other: &RuleKind) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for RuleKind

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for RuleKind