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31 papers · 2 filters
Determining the CP parity of Higgs bosons at the LHC in the to 1-prong decay channels
Stefan Berge, Werner Bernreuther
We propose a method for determining the CP nature of a neutral Higgs boson or spin-zero resonance at the CERN Large Hadron Collider (LHC) in its decay channel.…
The Top Quark Decay Vertex in Standard Model Extensions
Werner Bernreuther, Patrick Gonzalez, Martin Wiebusch
New physics interactions can affect the strength and structure of the vertex. We investigate the magnitudes and phases of "anomalous" contributions to this vertex in a two-Hi…
PCAC and coherent pion production by low energy neutrinos
Ch. Berger, L. M. Sehgal
Coherent pi^+ and pi^0 production in low energy neutrino reactions is discussed in the framework of the partially conserved axial vector current theory (PCAC). The role of lepton m…
Two-loop QCD correction to differential semi-leptonic b --> u decays in the shape-function region
M. Beneke, T. Huber, Xin-Qiang Li
We calculate the two-loop QCD correction to the form factors of on-shell b-quark decay to an energetic massless quark, which constitutes the last missing piece required for an O(al…
Twistor-inspired construction of massive quark amplitudes
Christian Schwinn
The analog of the Cachazo-Svrvcek-Witten rules for scattering amplitudes with massive quarks is derived following an approach previously employed for amplitudes with massive scalar…
QCD Factorization Based on Six-Quark Operator Effective Hamiltonian from Perturbative QCD and Charmless Bottom Meson Decays
Fang Su, Yue-Liang Wu, Yi-Bo Yang +1
The charmless bottom meson decays are systematically investigated based on an approximate six quark operator effective Hamiltonian from perturbative QCD. It is shown that within th…