The Standard Model [1] contains one neutral scalar Higgs boson, which is a remnant of the mechanism that breaks the SU(2) × U(1) symmetry and generates the W and Z boson masses. The Higgs couples to quarks and leptons of mass m f with a strength gm f /2M W. Its coupling to W and Z bosons is of strength g, where g is the coupling constant of the SU(2) gauge theory. The branching ratio of the Hig...

Recent results on inclusive D and D production in deeply inelastic ep scattering at √ s = 301 GeV are summarized. The data have been collected by the H1 and ZEUS experiments at HERA. The total and the differential cross sections are discussed in the framework of LO and NLO QCD predictions. The data exhibit clear evidence for boson gluon fusion dominating open heavy flavor production in the kine...

We discuss the implications of global symmetries on the radiative corrections to the Higgs sector. We focus on two examples: the charged Higgs mass in the minimal supersymmetric model and the Higgs couplings to vector boson pairs. In the first case, we find that in the absence of squark mixing a global SU(2)×SU(2) symmetry protects the charged Higgs mass from corrections of O(g2m4t/m 2 W ). In ...

Higgs boson searches are commonly considered one of the main objectives of particle physics nowadays. The latest results obtained by the CDF and DØ collaborations are presented here when seatching for Higgs boson decaying into a W-boson pair, currently the most sensitive channel for masses greater than 130 GeV. The presented results are based on an integrated luminosity that ranges from 3.0 to ...

Search for a new heavy gauge boson W' with event signature electron plus missing transverse energy in p(p)over-bar collisions at root s=1.96 TeV

We present a detailed study of the decays of the Higgs bosons H, H, and A within the Minimal Supersymmetric Standard Model including SUSY–QCD corrections. We find that the supersymmetric modes t̃ ̄̃ b (t̃̄t̃, and for large tanβ b̃ ̄̃ b) can dominate the H (H, A) decays in a wide range of the model parameters due to the large Yukawa couplings and mixings of t̃ and b̃. Compared to the conventional modes H →...

Electroweak radiative corrections give rise to large negative, double-logarithmically enhanced corrections in the TeV region. These are partly compensated by real radiation and, moreover, affected by selecting isospin-noninvariant external states. We investigate the impact of real gauge boson radiation more quantitatively by considering different restricted final state configurations. We consid...

Since it explains how the weak gauge bosons acquire their mass, the Higgs mechanism is a key point of the electroweak theory. In the Standard Model (SM), the Higgs mechanism predicts the existence of a scalar massive particle, the Higgs boson, which has never been observed yet. Because the SM is hardly consistent with the hierarchy between the Planck scale and the electroweak scale, it is certa...