Running of QCD parameters at four Loops

Please play with the applet. It gives running of masses and alpha-s at four loops with correct matching at every mass threshold (See Rodrigo, Pich, Santamaria Phys.Lett. B424 (1998) 367 (also at spires) and Rodrigo, Santamaria, Phys.Lett. B313 (1993) 441 and references therein). The small contribution of QED to this running has also been taken into account. The input parameters are MS-bar masses at their own mass and alpha-s(mZ). For comments or suggestions send mail to the author Arcadi Santamaria.