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SUMMARY:Composite models on a safe road to the Planck scale
DTSTART;VALUE=DATE-TIME:20181204T154000Z
DTEND;VALUE=DATE-TIME:20181204T160000Z
DTSTAMP;VALUE=DATE-TIME:20210307T025638Z
UID:indico-contribution-253-1194@indico.tlabs.ac.za
DESCRIPTION:Speakers: Giacomo Cacciapaglia (IPN Lyon)\nWe will introduce a
new paradigm that allows to define composite models that feature an inter
acting fixed point in the UV (asymptotic safety). This is based on large N
f resummation techniques. I will describe an example that features a compo
site Higgs and Dark Matter at low energies\, and that allows to generate f
lavour physics dynamically via partial compositeness.\n\nhttps://indico.tl
abs.ac.za/event/75/contributions/1194/
LOCATION:Casa do Sol
URL:https://indico.tlabs.ac.za/event/75/contributions/1194/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unification of gauge and Yukawa couplings
DTSTART;VALUE=DATE-TIME:20181204T150000Z
DTEND;VALUE=DATE-TIME:20181204T152000Z
DTSTAMP;VALUE=DATE-TIME:20210307T025638Z
UID:indico-contribution-253-1184@indico.tlabs.ac.za
DESCRIPTION:Speakers: Aldo Deandrea (IPNL - University Lyon 1)\nThe unific
ation of gauge and top Yukawa couplings is an attractive feature of gauge-
Higgs unification models in extra-dimensions. This feature is usually cons
idered difficult to obtain based on simple group theory analyses. We consi
der a minimal toy model including the renormalisation group running at one
loop. The gauge couplings unify asymptotically at high energies\, and we
discuss presence of an UV fixed point. The problem of the Higgs mass gener
ation by the Coleman-Weinberg effective potential is also discussed.\n\nht
tps://indico.tlabs.ac.za/event/75/contributions/1184/
LOCATION:Casa do Sol
URL:https://indico.tlabs.ac.za/event/75/contributions/1184/
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BEGIN:VEVENT
SUMMARY:Up- and Down- Quark Masses from QCD Finite Energy Sum Rules
DTSTART;VALUE=DATE-TIME:20181204T152000Z
DTEND;VALUE=DATE-TIME:20181204T154000Z
DTSTAMP;VALUE=DATE-TIME:20210307T025638Z
UID:indico-contribution-253-1169@indico.tlabs.ac.za
DESCRIPTION:Speakers: Alexes Mes (University of Cape Town)\nDue to quark-g
luon confinement in QCD\, the quark masses entering the QCD Lagrangian can
not be measured directly like\, for example\, the electron or the proton m
ass. They must be determined either numerically from Lattice QCD\, or anal
ytically using QCD sum rules. The latter makes use of the complex squared
energy plane\, and Cauchy’s theorem for the current-current correlator o
f the axial-vector divergences. This procedure relates a QCD expression co
ntaining the quark masses\, with a hadronic expression in terms of known h
adron masses\, couplings\, and lifetimes/widths. Thus\, the quark masses b
ecome a function of known hadronic information. \nWe determine the up- and
down- quark masses from a QCD Finite Energy Sum Rule\, using the pseudosc
alar correlator to six-loop order in perturbative QCD\, with the leading v
acuum condensates and higher order quark mass corrections included. We red
uce the systematic uncertainties stemming from the hadronic resonance sect
or by introducing an integration kernel in the Cauchy integral in the comp
lex squared energy plane. Further\, we examine the issue of convergence of
the perturbative QCD expression of the pseudoscalar-current correlator. B
oth the Fixed Order Perturbation Theory (FOPT) method and Contour Improved
Perturbation Theory (CIPT) method are explored. Our results from the latt
er exhibit very good convergence and stability in the wide window s$_0$ =
1.5 − 4.0 GeV$^2$\, where s$_0$ is the radius of the integration contour
in the complex squared energy s-plane. The results are: (m$_u$ +m$_d$)/2
= 4.36 ± 0.36 MeV (at a scale Q = 2 GeV)\, m$_u$(Q = 2 GeV) = 2.83 ± 0.2
3 MeV\, and m$_d$(Q = 2 GeV) = 5.90 ± 0.48 MeV.\n\nhttps://indico.tlabs.
ac.za/event/75/contributions/1169/
LOCATION:Casa do Sol
URL:https://indico.tlabs.ac.za/event/75/contributions/1169/
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