ELFT HÍRADÓ

[Andras LASZLO <laszlo.andras AT wigner.hu>]

---------- Forwarded message ----------
Date: Sun, 14 May 2023 23:25:36 +0200 (CEST)
From: Daniel Nogradi <nogradi AT bodri.elte.hu>
To: Daniel Nogradi <nogradi AT bodri.elte.hu>
Subject: ELTE particle physics seminar - May 16


Date/Time: 16 May, Tuesday, 14:15

Location: ELTE TTK, second floor, 2.54 Novobatzky room

Speaker: Daniel Nogradi (Eotvos)

Title:  The f_{PS,V} / m_V ratios and the conformal window

Abstract:

The mesonic f_PS / m_V and f_V / m_V ratios, with f the decay constant and m 
the
meson mass, are calculated in mass perturbed conformal gauge theories to NNLO
and N^3LO orders, respectively. Here NNLO and N^3LO refer to the
non-relativistic effective theory expansion which is the applicable framework.
The results are expanded a la Banks-Zaks in order to end up with
scheme-independent predictions. These perturbative results are unambiguously
reliable close to the upper end of the conformal window, Nf = 16.5 and it is
shown that they might be reliable down to Nf = 12. An attempt is made to match
these to previous non-perturbative lattice results in the range 1 < Nf < 11. 
An
abrupt change in the ratios is observed at around Nf = 12 - 13, which may 
signal
the lower end of the conformal window.

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