R.J.N. Phillips

Quark-parton model relations in deep inelastic lepton scattering

Abstract A complete listing of the quark-parton model relations among deep inelastic lepton-nucleon scattering processes is given, to be compared with forthcoming neutrino and anti-neutrino data. We also note the stronger relations that come from specializing in various ways, including antiquark and strange quark suppression, and the dual valence plus sea model. Finally we construct illustrative parametrizations, fitted to the electron data and minimizing the antiquark momentum content, in accord with early results for the neutrino/antineutrino cross-section ratio.

Phenomenological implications of the mt RGE fixed point for SUSY Higgs boson searches

Abstract In minimal SUSY-GUT models with MSUSY ≲ 1 TeV, the renormalization group equations have a solution dominated by the infrared fixed point of the top Yukawa coupling. This fixed point predicts mt = (200 GeV) sin β; combined with the LEP results it excludes mt ≲ 130 GeV. For mt in the range 130–160 GeV, we discuss the sensitivity of the mt fixed point result to GUT threshold corrections and point out the implications for Higgs boson searches. The lightest scalar h has mass 60–85 GeV and will be detectable at LEP II. At SSC/LHC, each of the five scalars h, H, A, H± may be detectable, but not all of them together; in one parameter region none will be detectable.

Quark singlets: Implications and constraints

Quarks whose left- and right-handed chiral components are both singlets with respect to the SU(2) weak-isospin gauge group, offer interesting physics possibilities beyond the standard model (SM) already studied in many contexts. We address here some further aspects. We first collect and update the constraints from present data on their masses and mixings with conventional quarks. We discuss possible effects on b\ensuremath{\rightarrow}s\ensuremath{\gamma} and Z\ensuremath{\rightarrow}bb\ifmmode\bar\else\textasciimacron\fi{} decays and give fresh illustrations of CP asymmetries in

Minijet veto: a tool for the heavy Higgs search at the LHC

{\mathit{B}}^{0}

On ψ and ϒ production via gluons

decays differing dramatically from SM expectations. We analyze singlet effects in grand unification scenarios: d-type singlets are most economically introduced in 5+

Remarks on the KARMEN anomaly

{5}^{\mathrm{*}}

Heavy charged Higgs signals at the LHC

multiplets of SU(5), with up to three generations, preserving gauge coupling unification with perturbative values up to the GUT scale; u-type singlets can arise in 10+1

Implications of b-->s gamma decay measurements in testing the Higgs sector of the minimum supersymmetric standard model.

{0}^{\mathrm{*}}

Bd0−B̄0d oscillations and the top quark mass

multiplets of SU(5) with at most one light generation. With extra matter multiplets the gauge couplings are bigger; we give the two-loop evolution equations including exotic multiplets and a possible extra U(1) symmetry. Two-loop effects can become important, threatening unification (modulo threshold effects), perturbativity, and asymptotic freedom of

Evidence for the t Quark in anti-p p Collider Data

{\mathrm{\ensuremath{\alpha}}}_{3}