Abstract
| Original language | English |
|---|---|
| Title of host publication | High-Precision αs Measurements from LHC to FCC-ee |
| Editors | David d'Enterria, Peter Skands |
| Place of Publication | Geneva Switzerland |
| Publisher | CERN |
| Pages | 3-4 |
| Number of pages | 2 |
| Publication status | Published - 16 Dec 2015 |
| Event | High-Precision αs Measurements from LHC to FCC-ee - CERN, Geneva, Switzerland Duration: 12 Oct 2015 → 13 Oct 2015 https://indico.cern.ch/event/392530/overview |
Conference
| Conference | High-Precision αs Measurements from LHC to FCC-ee |
|---|---|
| Country | Switzerland |
| City | Geneva |
| Period | 12/10/15 → 13/10/15 |
| Internet address |
Cite this
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Introduction. / d'Enterria, David; Skands, Peter Zeiler.
High-Precision αs Measurements from LHC to FCC-ee. ed. / David d'Enterria; Peter Skands. Geneva Switzerland : CERN, 2015. p. 3-4.Research output: Chapter in Book/Report/Conference proceeding › Foreword / Postscript › Other
TY - CHAP
T1 - Introduction
AU - d'Enterria, David
AU - Skands, Peter Zeiler
PY - 2015/12/16
Y1 - 2015/12/16
N2 - The strong coupling αs is one of the fundamental parameters of the Standard Model (SM), setting the scale of the strength of the strong interaction theoretically described by Quantum Chromodynamics (QCD). Its measured (2014) value amounts to αs(m2Z) = 0.1185 ± 0.0006 at the reference Z pole mass scale. Given its current δαs(m2Z)/αs(m2Z) ≈ 0.5% uncertainty—orders of magnitude larger than that of the gravitational (δG/G ≈ 10−5), Fermi (δGF/GF ≈ 10−8), and QED (δα/α ≈ 10−10)couplings—the strong coupling is the least precisely known of all fundamental constants in nature.Improving our knowledge of αs is a prerequisite to reduce the theoretical uncertainties in the calculations of all high-precision perturbative QCD (pQCD) processes whose cross sections or decayrates depend on higher-order powers of αs, as is the case for virtually all those measured at the LHC. In the Higgs sector, in particular, the uncertainty on αs is currently the second major contributor(after the bottom mass) to the parametric uncertainties of its dominant H → bb partial decay.The same applies for the extraction of the charm Yukawa coupling via future H → cc¯ measurements
AB - The strong coupling αs is one of the fundamental parameters of the Standard Model (SM), setting the scale of the strength of the strong interaction theoretically described by Quantum Chromodynamics (QCD). Its measured (2014) value amounts to αs(m2Z) = 0.1185 ± 0.0006 at the reference Z pole mass scale. Given its current δαs(m2Z)/αs(m2Z) ≈ 0.5% uncertainty—orders of magnitude larger than that of the gravitational (δG/G ≈ 10−5), Fermi (δGF/GF ≈ 10−8), and QED (δα/α ≈ 10−10)couplings—the strong coupling is the least precisely known of all fundamental constants in nature.Improving our knowledge of αs is a prerequisite to reduce the theoretical uncertainties in the calculations of all high-precision perturbative QCD (pQCD) processes whose cross sections or decayrates depend on higher-order powers of αs, as is the case for virtually all those measured at the LHC. In the Higgs sector, in particular, the uncertainty on αs is currently the second major contributor(after the bottom mass) to the parametric uncertainties of its dominant H → bb partial decay.The same applies for the extraction of the charm Yukawa coupling via future H → cc¯ measurements
UR - http://arxiv.org/pdf/1512.05194.pdf
M3 - Foreword / Postscript
SP - 3
EP - 4
BT - High-Precision αs Measurements from LHC to FCC-ee
A2 - d'Enterria, David
A2 - Skands, Peter
PB - CERN
CY - Geneva Switzerland
ER -