259 citations · 1.6k across the 79 of their papers we have counts for
17 papers · 1 filter
Theory on CKM and heavy quark decay
Oliver Witzel
The combination of precise experimental measurements and theoretical predictions allows to extract Cabibbo-Kobayashi-Maskawa (CKM) matrix elements or constrain flavor changing proc…
Goldstone Boson Scattering with a Light Composite Scalar
T. Appelquist, R. C. Brower, K. K. Cushman +14
The appearance of a light composite scalar resonance in nearly conformal gauge-fermion theories motivates further study of the low energy structure of these theories. To this…
Nonperturbative calculations of form factors for exclusive semileptonic decays
Jonathan M. Flynn, Ryan C. Hill, Andreas Jüttner +3
Precise theoretical predictions derived from the Standard Model are a key ingredient in searches for new physics in the flavor sector. The large mass and long lifetime of the q…
Composite Higgs scenario in mass-split models
Oliver Witzel, Anna Hasenfratz, Curtis T. Peterson
Mass-split composite Higgs models naturally accommodate the experimental observation of a light 125 GeV Higgs boson and predict a large scale separation to other heavier resonances…
Near-conformal dynamics in a chirally broken system
Thomas Appelquist, Richard C. Brower, Kimmy K. Cushman +11
Composite Higgs models must exhibit very different dynamics from quantum chromodynamics (QCD) regardless whether they describe the Higgs boson as a dilatonlike state or a pseudo-Na…
Lattice QCD (focus on Charm and Beauty form factors, , - & -quark masses)
Oliver Witzel
We present an overview of state of the art lattice quantum chromodynamcis calculations for heavy-light quantities. Special focus is given to the calculation of form factors for sem…
Composite Higgs from mass-split models
Oliver Witzel, Anna Hasenfratz, Claudio Rebbi
Beyond Standard Model theories describing the electro-weak sector must exhibit a large separation of scales (or "walking") to account for a light, 125 GeV Higgs boson and the fact…
Linear Sigma EFT for Nearly Conformal Gauge Theories
T. Appelquist, R. C. Brower, G. T. Fleming +11
We construct a generalized linear sigma model as an effective field theory (EFT) to describe nearly conformal gauge theories at low energies. The work is motivated by recent lattic…
Large scale separation and hadronic resonances from a new strongly interacting sector
Anna Hasenfratz, Claudio Rebbi, Oliver Witzel
A large separation of scales is frequently required by theories describing physics beyond the Standard Model. In mass-split models with some massless (light) and some heavy flavors…
Large scale separation and resonances within LHC range from a prototype BSM model
Anna Hasenfratz, Claudio Rebbi, Oliver Witzel
Many theories describing physics beyond the Standard Model rely on a large separation of scales. Large scale separation arises in models with mass-split flavors if the system is co…
Composite Higgs model at a conformal fixed point
R. C. Brower, A. Hasenfratz, C. Rebbi +2
We propose to construct a chirally broken model based on the infrared fixed point of a conformal system by raising the mass of some flavors while keeping the others massless. In th…
Direct Detection of Stealth Dark Matter through Electromagnetic Polarizability
Thomas Appelquist, Evan Berkowitz, Richard C. Brower +15
We calculate the spin-independent scattering cross section for direct detection that results from the electromagnetic polarizability of a composite scalar baryon dark matter candid…
Stealth Dark Matter: Dark scalar baryons through the Higgs portal
Thomas Appelquist, Richard C. Brower, Michael I. Buchoff +14
We present a new model of "Stealth Dark Matter": a composite baryonic scalar of an strongly-coupled theory with even . All mass scales are technically natural…
Two-Color Theory with Novel Infrared Behavior
T. Appelquist, R. C. Brower, M. I. Buchoff +13
Using lattice simulations, we study the infrared behavior of a particularly interesting SU(2) gauge theory, with six massless Dirac fermions in the fundamental representation. We c…
Heavy Meson Distribution Amplitudes of Definite Geometric Twist with Contribution of 3-Particle Distribution Amplitudes
B. Geyer, O. Witzel
Under the constraints of HQET the equations of motion of heavy meson distribution amplitudes of definite geometric twist, using the knowledge of their off-cone structure, are refor…
B-Meson Distribution Amplitudes of Geometric Twist vs. Dynamical Twist
Bodo Geyer, Oliver Witzel
Two- and three-particle distribution amplitudes of heavy pseudoscalar mesons of well-defined geometric twist are introduced. They are obtained from appropriately parametrized vacuu…
Lattice Gauge Theory
Hartmut Wittig
The status of lattice calculations in Quantum Field Theory is reviewed. A major part is devoted to recent progress in formulating exact chiral symmetry on the lattice. Another topi…