We introduce a class of exactly solvable boson models. We give explicit analytic expressions for energy eigenvalues and eigenvectors for an sd-boson Hamiltonian, which is related to the SO(6) chain of the Interacting Boson Model Hamiltonian.

There are many reasons for studying WW/WZ → lνqq̄ at the Tevatron. From the electroweak prospective, diboson production provides a probe of self-interactions of vector bosons. Deviations from the Standard Model (SM) of these trilinear gauge boson coupling would affect the cross sections and event kinematics of diboson production1. The cross sections for diboson production at the Tevatron had pre...

We present some of the results in the areas of QCD and Electroweak physics for Run II of the DØ experiment at the Fermilab Tevatron. QCD results include dijet angular decorrelations and inclusive jet and dijet cross sections. Electroweak results include the decay of Z bosons to tau pairs and several results on gauge boson pairs. No deviations from the Standard Model have been observed.

We present a search for a dark photon, a new massive vector boson interacting weakly with Standard Model particles, using data collected with the BABAR detector. No statistically significant deviations from the Standard Model predictions are seen, and 90% confidence level upper limits on the mixing strength between the photon and dark photon are set at the level of 10−4 − 10−3 for dark photon m...

We study possible deviations from the Standard Model in the reaction e + e − → Zφ, where φ denotes a spinless neutral boson. We show how the Z decay angular correlation can be used to extract detailed information on the φ couplings, such as the parity of φ, radiatively induced form factor effects and possible CP violation in the scalar sector.

The Coulomb problem for vector bosons W incorporates a well known difficulty; the charge of the boson localized in a close vicinity of the attractive Coulomb center proves be infinite. This fact contradicts the renormalizability of the Standard Model, which presumes that at small distances all physical quantities are well defined. The paradox is shown to be resolved by the QED vacuum polarizati...

We estimate the attainable limits on the coefficients of dimension-6 operators from the analysis of Higgs boson phenomenology, in the framework of a SULs2d 3 UY s1d gauge-invariant effective Lagrangian. Our results, based on the data sample already collected by the collaborations at Fermilab Tevatron, show that the coefficients of Higgs-vector boson couplings can be determined with unprecedente...

By assuming the existence of the sequential fourth generation to the minimal supersymmetric standard model (MSSM), we study the possibility of a strongly first-order electroweak phase transition. We find that there is a parameter region of the MSSM where the electroweak phase transition is strongly first order. In that parameter region, the mass of the lighter scalar Higgs boson is calculated t...

The complete set of two-loop electroweak corrections to the decay width of the Higgs boson into two photons is presented. Two-loop contributions involving weak bosons and the top quark are computed in terms of an expansion in the Higgs external momentum. Adding these results to the previously known light fermion contributions, we find that the total electroweak corrections for a Higgs boson wit...

In the large extra dimensional ADD scenario, Z bosons undergo a one-loop decay into a photon and Kaluza-Klein towers of gravitons/gravi-scalars. We calculate such a decay width, extending previous arguments about the general form of the fourdimensional on-shell amplitude. The amplitudes calculated are relevant to processes in other extra dimensional models where the Standard Model fields are co...