Joseph Howard

K{sup 0}-K{sup 0} mixing beyond the standard model and CP-violating electroweak penguins in quenched QCD with exact chiral symmetry

We present results for the

The Structure of electroweak corrections due to extended gauge symmetries

\ensuremath{\Delta}S=2

Diquark correlations in baryons on the lattice with overlap quarks

matrix elements which are required to study neutral kaon mixing in the standard model (SM) and beyond . We also provide leading chiral order results for the matrix elements of the electroweak penguin operators which give the dominant

Light hadron spectra and wave functions in quenched QCD with overlap quarks on a large lattice

\ensuremath{\Delta}I=3/2

PRECISION ELECTROWEAK CONSTRAINTS ON HIDDEN LOCAL SYMMETRIES

contribution to direct

Matrix elements and diquark correlations in quenched QCD with overlap fermions.

CP

Electroweak penguins and SUSY K0-K¯0 mixing with Neuberger quarks☆☆☆

violation in

Electroweak penguins and SUSY - mixing with Neuberger quarks

K\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}

Electroweak penguins and SUSY K0 - anti-K0 mixing with Neuberger quarks

decays. Our calculations were performed with Neuberger fermions on two sets of quenched Wilson gauge configurations at inverse lattice spacings of approximately 2.2 GeV and 1.5 GeV. All renormalizations were implemented nonperturbatively in the regularization-independent/momentum (RI/MOM) scheme, where we accounted for subleading operator product expansion corrections and discretization errors. We find ratios of non-SM to SM matrix elements which are roughly twice as large as in the only other dedicated lattice study of these amplitudes. On the other hand, our results for the electroweak penguin matrix elements are in good agreement with two recent domain-wall fermion calculations. As a by-product of our study, we determine the strange quark mass. Our main results are summarized and discussed in Sec. VII. Within our statistics, we find no evidence for scaling violations.

Light hadron and diquark spectroscopy in quenched QCD with overlap quarks on a large lattice

Author(s): Chivukula, RS; He, HJ; Howard, J; Simmons, EH | Abstract: This paper studies models with extended electroweak gauge sectors of the form [Formula Presented] We establish the general behavior of corrections to precision electroweak observables in this class of theories and connect our results to previous work on specific models whose electroweak sectors are special cases of our extended group.