3-7 June 2019
Centro Cultural Isabel de Farnesio, Aranjuez, Madrid (Spain)
Europe/Madrid timezone

Determining the strong running coupling at $Z_0$-mass from lattice QCD with physical quark masses (F. de Soto Borreo)

4 Jun 2019, 17:45
30m
Centro Cultural Isabel de Farnesio, Aranjuez, Madrid (Spain)

Centro Cultural Isabel de Farnesio, Aranjuez, Madrid (Spain)

C/ Capitán Angosto Gómez Castrillón, 39, 28300 Aranjuez, Madrid (Spain)
QCD

Speaker

Feliciano de Soto Borrero (Universidad Pablo de Olavide)

Description

(25'+5')

The non-renormalization of the ghost-gluon vertex offers a precise recipe to determine the running of $\alpha_s$ from gluon and ghost propagators in lattice-QCD (in the Taylor renormalization scheme). A non-perturvative analysis of this running allows obtaining $\Lambda_{\rm \overline{MS}}$ which determines the value of the coupling at the $Z_0$-pole mass, $\alpha_{\rm \overline{MS}}(m_Z^2)$.

In this work, we exploit lattice QCD configurations using Domain-Wall fermions at the physical pion mass to compute $\alpha_T(q²)$. Besides the relevance of this parameter in many computations for hadron collider physics (Its current uncertainty of about 1% renders it the least precisely known of all fundamental coupling constants in nature), the Taylor-scheme strong coupling
has been revealed of great interest by itself because it can be directly related to the quark-gluon interaction kernel in continuum approaches to the QCD bound-state problem.

Primary author

Feliciano de Soto Borrero (Universidad Pablo de Olavide)

Co-authors

Dr Savvas Zafeiropoulos (nstitute for Theoretical Physics, Heidelberg University, ) Dr Philippe Boucaud (Universidad Paris Sud) Dr Jorge Segovia González (Universidad Pablo de Olavide) Dr José Rodríguez-Quintero (Universidad de Huelva)

Presentation Materials

There are no materials yet.