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The top quark may be singly produced in e + e - collisions via the exchange of leptoquarks. We present results for e + e - →tc¯, ct¯ , or tū , ut¯ open and bound-state production in terms of superstring Yukawa couplings.
In agreement with the commonly accepted neutrality of the free neutron, its charge q n was found to be (-0.4±1.1)× 10 - 21 electron charges. This value lowers the present upper limit by more than one order of magnitude. In the experiment a beam of cold neutrons with wavelengths between 1.2 and...
The anticharm-charm asymmetry A(c,c¯) in the inclusive decay of tagged B 0 and B¯ 0 mesons is calculated within the context of the Kobayashi-Maskawa (KM) model. It is shown that A(c,c¯) is independent of the final-state interactions to a very good approximation. By using estimates of branching...
Perturbative QCD and the random-phase approximation are used to study the current-current correlation function in quark-gluon plasma. The calculations show that there are damped collective oscillations in the system. An estimate of the Debye screening length gives a value of about 0.5 fm at a...
Low-energy baryon-nucleon scattering is calculated in the rearrangement model. Predictions are given for scattering cross sections pertinent to the experiments now planned at the CERN Low Energy Proton Ring. Agreement with the sparse existing data is encouraging.
By postulating naive tensor-meson dominance in the energy-momentum-tensor θ μ ν couplings, we find that, in addition to f and f ’ , another tensor meson is needed to explain the ratio of Γ(f ’ →KK¯)/Γ(f→ππ). Considering θ (1720), the tensor-glueball candidate, as this meson we...
We examine the single and pair production of scalar leptoquarks ( S ) in pp and p¯p collisions. The signals and backgrounds for leptoquark production are discussed. We find that the discovery limits for pair production are M S ≃40 GeV at the CERN collider, 120 GeV at the Fermilab Tevatron, and...
The observation of substantial B 0 B¯ 0 mixing imposes stringent constraints on models which feature a second Higgs doublet. The constraints are independent of and comparable to the bounds which can be derived from the K system.
The splitting between the P 1 1 and the center of gravity of the P j 3 states of heavy quarkonia is evaluated using the perturbative QCD expression for the hyperfine potential. The theoretical result is about 1% of the absolute fine-structure splitting and disagrees with an experimental value.
The energy release from supernovas via the emission of Majoron-like particles is considered to obtain a constraint on the Yukawa couplings with neutrinos. In view of the observed neutrino flux from the supernova SN1987A, a forbidden region of the Yukawa coupling, 2× 10 - 5
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