Helper class for electroweak quantities and EW-dependent blocks. More...

#include <EWHelper.h>

Static Public Member Functions
static void	Init ()
	Initializes the EW dependent block.

static double	alpha_em (double mu)
	Returns $\alpha_{\text{em}}(\mu)$ at a given scale.

Detailed Description

Helper class for electroweak quantities and EW-dependent blocks.

EWHelper is responsible for:

declaring and initializing a dependent "EW" block through DependentBlockManager::addDependentBlock,
providing (currently stubbed) running of the electromagnetic coupling $\alpha_{\text{em}}(\mu)$ ,
implementing internal building blocks (delta-leptonic/hadronic, matching across thresholds, etc.) for alpha evolution.

The "EW" block stores several special values of $\alpha_{\text{em}}$ :

(1,1): $\alpha_{\text{em}}(m_Z)$ ,
(1,2): $\alpha_{\text{em}}(\mu_b)$ ,
(1,3): $\alpha_{\text{em}}(\mu_c)$ ,
(1,4): $\alpha_{\text{em}}(0) \approx 1/137.036$ (Thomson limit).

These values are computed from the content of SMINPUTS, QCD, and Wilson scale blocks (B_SCALE, D_SCALE).

Definition at line 49 of file EWHelper.h.

Member Function Documentation

◆ alpha_em()

double EWHelper::alpha_em ( double mu )

static

Returns $\alpha_{\text{em}}(\mu)$ at a given scale.

Currently, the full running is not implemented, and this function simply logs an error and returns 0.0. Code that needs $\alpha_{\text{em}}$ should instead use the precomputed special values in the "EW" block.

Parameters

mu	Renormalization scale.

Returns: Value of $\alpha_{\text{em}}(\mu)$ (currently always 0.0 with an error log).

Definition at line 33 of file EWHelper.cpp.

◆ Init()

void EWHelper::Init ( )

static

Initializes the EW dependent block.

This constructs the "EW" DependentBlock using DependentBlockManager::addDependentBlock, with the following sources:

SM::SMINPUTS, SM::QCD,
WILSON::B_SCALE, WILSON::D_SCALE.

The resulting block contains several fixed $\alpha_{\text{em}}$ values at:

,
$\mu_b$ ,
$\mu_c$ ,
and the Thomson limit ( $\mu \to 0$ ).

Definition at line 5 of file EWHelper.cpp.

The documentation for this class was generated from the following files:

/home/runner/work/Hyperiso/Hyperiso/Hyperiso/Hyperiso/core/src/Core/infrastructure/EWHelper.h
/home/runner/work/Hyperiso/Hyperiso/Hyperiso/Hyperiso/core/src/Core/infrastructure/EWHelper.cpp

Static Public Member Functions

Detailed Description

Member Function Documentation

◆ alpha_em()

◆ Init()