A brief review is given of recent analyses of the effects of CP phases on the supersymmetric QCD and supersymmetric electroweak contibutions to the b and t quark masses and to the τ lepton mass in SUGRA models. The effects of CP phases on the supersymmetric contributions are found to be significanlty large for the b quark mass as they can change both its sign and its magnitude. Thus with the in...

Using recently evaluated contributions (including a novel one calculated here), we present updated values for the pole mass and M S mass of the b quark: m b = 5022 ± 58 MeV, for the pole mass, and ¯ m b (¯ m b) = 4286±36 MeV for the M S one. These values are accurate including, respectively, O(α 5 s log αs) and O(α 3 s) corrections and, in both cases, leading orders in the ratio m 2 c /m 2 b. O...

The ACCMM model predicts the lepton spectrum from B meson decay by assuming the meson disintegrates into a spectator quark of definite mass and momentum distribution and an off shell b quark whose decay leptons (boosted into the rest frame of the meson) determine the lepton spectrum. In this letter, we show that one can define a model dependent b quark mass so that the spectrum derived from the...

We describe a realistic, renormalizable, supersymmetric “quindecuplet” model in which the top quark, left-handed bottom quark, and up-type Higgs boson are composite, with a compositeness scale∼ 1−3 TeV. The top-Higgs Yukawa coupling is a dynamically generated strong interaction effect, and is naturally much larger than any other Yukawa coupling. The light quark doublets and right-handed up-type...

We study the axial transition form factors $G_A^{B\to B'}(Q^2)$ as well charges $g_A^{B\to B'}$ of octet baryons in perturbative chiral quark model~(PCQM) with including both ground and excited states intermediate propagators. The PCQM results on are found good agreement existing experimental data lattice-QCD values. figures out that for all transitions behave dipolelike form, which is dominant...

The quark helicity measured in polarized deep inelastic scattering is different from the quark spin in the rest frame of the nucleon. We point out that the quark spin distributions ∆qRF (x) are connected with the quark helicity distributions ∆q(x) and the quark transversity distributions δq(x) by an approximate relation: ∆qRF (x) +∆q(x) = 2δq(x). This relation will be useful in order to measure...

In this paper we present three updates to heavy flavour results from the SLD detector at SLAC. These results are preliminary, based on our full 1993-1998 dataset of 550 000 hadronic Z 0 decays produced with an average electron polarisation of 73%. The new measurements are of the hadronic branching fractions into heavy quarks (R b , Rc), the b quark asymmetry (A b) using jet charge, and the heav...

It has been pointed out recently by Chanowitz that the Z → b ¯ b decay asymmetry poses a problem for the standard model whether it is genuine or not [1]. If this conflict is interpreted as new physics in the b-quark couplings, it suggests a rather large right handed coupling of the b-quark to the Z-boson. We show that it is possible to accommodate this result in left-right models that single ou...

In this paper we present three updates to heavy flavour results from the SLD detector at SLAC. These results are preliminary, based on our full 1993-1998 dataset of 550 000 hadronic Z 0 decays produced with an average electron polarisation of 73%. The new measurements are of the hadronic branching fractions into heavy quarks (R b , Rc), the b quark asymmetry (A b) using jet charge, and the heav...