alphas: compute alpha strong at given scale

Description Usage Arguments Value Author(s) See Also Examples

View source: R/alpha_s.R

Description

compute alpha strong (alpha_s) at given scale mu up to N3LO in PT in the RI' renormalisation scheme.

Usage

1
alphas(mu, nl = 3, lam0 = 0.25, Nc = 3, Nf = 2, use.cimpl = TRUE)

Arguments

mu

the renormalisation scale mu in GeV

nl

order in PT, range 0 to 3

lam0

Lambda_QCD in GeV

Nc

number of colours Nc, defaults to 3

Nf

number of flavours Nf, default is 2

use.cimpl

Use the C implementation instead of the R implementation, which might improve speed.

Value

returns the value of alpha strong alpha_s at scale mu

Author(s)

Carsten Urbach, curbach@gmx.de, Vittorio Lubicz (of the original Fortran code)

See Also

zetazp

Examples

1
alphas(mu=2.0, nl=3)

hadron documentation built on Jan. 13, 2021, 8 a.m.