hadron (version 3.1.2)

zetazp: Computes the running of Z_P from scale mu0 to scale mu2

Description

Computes the running of the renomalisation constant \(Z_P\) from scale \(\mu_0\) to scale \(\mu_2\) in the renomalisation schema RI' for \(N_f=2\) only. The running is done using perturbation theory up to \(\alpha_s**3\) order. The corresponding values of \(\alpha_s\) at the scales \(\mu_0\) and \(\mu_2\) are needed as input, see alphas.

Usage

zetazp(zp0, alpha0, alpha2, nl = 3)

Arguments

zp0

initial value of \(Z_P\)

alpha0

\(\alpha_s\) at initial scale

alpha2

\(\alpha_s\) at final scale

nl

order in PT, range 0 to 3

Value

returns the value of Z_P at scale mu2 in the RI' scheme

See Also

alphas

Examples

# NOT RUN {
al2 <- alphas(mu = 3.0, nl = 3, lam0 = 0.250, Nc = 3, Nf = 2)
al0 <- alphas(mu = 2.0, nl = 3, lam0 = 0.250, Nc = 3, Nf = 2)
zetazp(zp0 = 0.6, alpha0 = al0, alpha2 = al2, nl = 3)

# }