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High-precision $alpha_s$ measurements from LHC to FCC-ee | | David d'Enterria
; Peter Z. Skands
; S. Alekhin
; A. Banfi
; S. Bethke
; J. Blümlein
; K.G. Chetyrkin
; D. d'Enterria
; G. Dissertori
; X. Garcia i Tormo
; A. H. Hoang
; M. Klasen
; T. Klijnsma
; S. Kluth
; J.-L. Kneur
; B.A. Kniehl
; D. W. Kolodrubetz
; J. Kühn
; P. Mackenzie
; B. Malaescu
; V. Mateu
; L. Mihaila
; S. Moch
; K. Mönig
; R. Perez-Ramos
; A. Pich
; J. Pires
; K. Rabbertz
; G. P. Salam
; F. Sannino
; J. Soto i Riera
; M. Srebre
; I. W. Stewart
; | | Date: |
16 Dec 2015 | | Abstract: | This document provides a writeup of all contributions to the workshop on
"High precision measurements of $alpha_s$: From LHC to FCC-ee" held at CERN,
Oct. 12--13, 2015. The workshop explored in depth the latest developments on
the determination of the QCD coupling $alpha_s$ from 15 methods where high
precision measurements are (or will be) available. Those include low-energy
observables: (i) lattice QCD, (ii) pion decay factor, (iii) quarkonia and (iv)
$ au$ decays, (v) soft parton-to-hadron fragmentation functions, as well as
high-energy observables: (vi) global fits of parton distribution functions,
(vii) hard parton-to-hadron fragmentation functions, (viii) jets in $e^pm$p
DIS and $gamma$-p photoproduction, (ix) photon structure function in
$gamma$-$gamma$, (x) event shapes and (xi) jet cross sections in $e^+e^-$
collisions, (xii) W boson and (xiii) Z boson decays, and (xiv) jets and (xv)
top-quark cross sections in proton-(anti)proton collisions. The current status
of the theoretical and experimental uncertainties associated to each extraction
method, the improvements expected from LHC data in the coming years, and future
perspectives achievable in $e^+e^-$ collisions at the Future Circular Collider
(FCC-ee) with $cal{O}$(1--100 ab$^{-1}$) integrated luminosities yielding
10$^{12}$ Z bosons and jets, and 10$^{8}$ W bosons and $ au$ leptons, are
thoroughly reviewed. The current uncertainty of the (preliminary) 2015 strong
coupling world-average value, $alpha_s(m_Z)$ = 0.1177 $pm$ 0.0013, is about
1\%. Some participants believed this may be reduced by a factor of three in the
near future by including novel high-precision observables, although this
opinion was not universally shared. At the FCC-ee facility, a factor of ten
reduction in the $alpha_s$ uncertainty should be possible, mostly thanks to
the huge Z and W data samples available. | | Source: | arXiv, 1512.5194 | | Services: | Forum | Review | PDF | Favorites | |
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