TY  - JOUR
A1  - Kilian, W.
A1  - Ohl, T.
A1  - Reuter, J.
A1  - Speckner, C.
T1  - QCD in the color-flow representation
JF  - Journal of High Energy Physics
N2  - For many practical purposes, it is convenient to formulate unbroken non-abelian gauge theories like QCD in a color-flow basis. We present a new derivation of SU(N) interactions in the color-flow basis by extending the gauge group to U(N) × U(1)′ in such a way that the two U(1) factors cancel each other. We use the quantum action principles to show the equivalence to the usual basis to all orders in perturbation theory. We extend the known Feynman rules to exotic color representations (e.g. sextets) and discuss practical applications as they occur in automatic computation programs.
KW  - QCD
KW  - scattering amplitudes
KW  - 1/N expansion
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-129583
VL  - 10
IS  - 022
ER  - 
TY  - JOUR
T1  - Search for a new heavy gauge-boson resonance decaying into a lepton and missing transverse momentum in 36 fb\(^{-1}\) of \({pp}\) collisions at root s=13 TeV with the ATLAS experiment
JF  - The European Physical Journal C
N2  - The results of a search for new heavy W' bosons decaying to an electron or muon and a neutrino using proton-proton collision data at a centre-of-mass energy of root s = 13 TeV are presented. The dataset was collected in 2015 and 2016 by the ATLAS experiment at the Large Hadron Collider and corresponds to an integrated luminosity of 36.1 fb(-1). As no excess of events above the Standard Model prediction is observed, the results are used to set upper limits on the W' boson cross-section times branching ratio to an electron or muon and a neutrino as a function of the W' mass. Assuming a W' boson with the same couplings as the Standard Model W boson, W' masses below 5.1 TeV are excluded at the 95% confidence level.
KW  - Cross-Section
KW  - Symmetry
KW  - Events
KW  - QCD
KW  - EW
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-220869
VL  - 78
IS  - 401
ER  - 
TY  - JOUR
T1  - Search for exclusive Higgs and Z boson decays to phi gamma and rho gamma with the ATLAS detector
JF  - Journal of High Energy Physics
N2  - A search for the exclusive decays of the Higgs and Z bosons to a phi or rho meson and a photon is performed with a pp collision data sample corresponding to an integrated luminosity of up to 35.6 fb(-1) collected at root s = 13 TeV with the ATLAS detector at the CERN Large Hadron Collider. These decays have been suggested as a probe of the Higgs boson couplings to light quarks. No significant excess of events is observed above the background, as expected from the Standard Model. Upper limits at 95% confidence level were obtained on the branching fractions of the Higgs boson decays to phi gamma and rho gamma of 4.8 x 10(-4) and 8.8 x 10(-4), respectively. The corresponding 95% confidence level upper limits for the Z boson decays are 0.9 x 10(-6) and 25 x 10(-6) for phi gamma and rho gamma, respectively.
KW  - Hadron-Hadron scattering (experiments)
KW  - Mass
KW  - Hierarchy
KW  - QCD
KW  - Higgs physics
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-220717
VL  - 127
IS  - 7
ER  -