Struct pineappl::evolution::OperatorInfo

pub struct OperatorInfo {
    pub fac0: f64,
    pub pids0: Vec<i32>,
    pub x0: Vec<f64>,
    pub fac1: Vec<f64>,
    pub pids1: Vec<i32>,
    pub x1: Vec<f64>,
    pub ren1: Vec<f64>,
    pub alphas: Vec<f64>,
    pub xir: f64,
    pub xif: f64,
    pub lumi_id_types: String,
}

Information about the evolution kernel operator (EKO) passed to Grid::evolve as operator, which is used to convert a Grid into an [FkTable]. The dimensions of the EKO must correspond to the values given in [fac1], [pids0], [x0], [pids1] and [x1], exactly in this order. Members with a 1 are defined at the squared factorization scales given in [fac1] (often called process scales) and are found in the Grid that Grid::evolve is called with. Members with a 0 are defined at the squared factorization scale [fac0] (often called fitting scale or starting scale) and are found in the [FkTable] resulting from Grid::evolve.

The EKO may convert a Grid from a basis given by the particle identifiers [pids1] to a possibly different basis given by [pids0]. This basis must also be identified using [lumi_id_types], which tells [FkTable::convolute] how to perform a convolution. The members [ren1] and [alphas] must be the strong couplings given at the respective renormalization scales. Finally, [xir] and [xif] can be used to vary the renormalization and factorization scales, respectively, around their central values.

Fields

fac0: f64

Squared factorization scale of the FkTable.

pids0: Vec<i32>

Particle identifiers of the FkTable.

x0: Vec<f64>

x-grid coordinates of the FkTable

fac1: Vec<f64>

Squared factorization scales of the Grid.

pids1: Vec<i32>

Particle identifiers of the Grid. If the Grid contains more particle identifiers than given here, the contributions of them are silently ignored.

x1: Vec<f64>

x-grid coordinates of the Grid.

ren1: Vec<f64>

Renormalization scales of the Grid.

alphas: Vec<f64>

Strong couplings corresponding to the order given in [ren1].

xir: f64

Multiplicative factor for the central renormalization scale.

xif: f64

Multiplicative factor for the central factorization scale.

lumi_id_types: String

Identifier of the particle basis for the FkTable.