Jatinder K Bajaj
Articles written in Pramana – Journal of Physics
Volume 8 Issue 4 April 1977 pp 309-314 Nuclear And Particle Physics
Decays of the mesons and the singlet photon
In an attempt to explain the recent measurements on the radiative decays of the vector-mesons (
Volume 12 Issue 4 April 1979 pp 397-417 Particle Physics
Neutral currents in left-right symmetric gauge models
Jatinder K Bajaj G Rajasekaran
We analyse all the neutral-current phenomena following from the general class of gauge models based on the group SU(2)_{L} ⊗ SU(2)_{R} ⊗ U(1). It is found that the neutral-current couplings in these models bear a remarkable similarity to those in the standard Weinberg-Salam gauge model. The parameter which plays the role of sin^{2}ϑ_{w} is found to lie between 0 and 1/2. Comparison with experimental data shows that even a model with the ratio of the masses of the two
Volume 14 Issue 5 May 1980 pp 395-409 Particle Physics
The electroweak mixing angle in unified gauge theories
Jatinder K Bajaj G Rajasekaran
We study in detail the factors that influence the unification relations among the coupling parameters of strong and electroweak interactions. We find that the factor that decides the unification relations in a theory is the fermion content of the theory. The specific ‘observed’ group of strong and electroweak interactions used and the specific unification group in which these interactions are embedded are largely irrelevant. In particular, we find that the unification value of the electroweak mixing angle is the same for almost all models of interest. We also explicitly illustrate that the canonical value 3/8 of the mixing angle is a characteristic result of the currently popular sequential doublets scheme of fermions. Addition of extra fermion singlets reduces the mixing angle to 1/4. We propose this sequential triplets scheme of fermions as an interesting alternative to the current scheme.
Volume 14 Issue 5 May 1980 pp 411-422 Particle Physics
The electroweak mixing angle in unified gauge theories—the renormalisation effects
Jatinder K Bajaj G Rajasekaran
A general analysis of the renormalisation corrections to the unification results for the coupling constants of strong and electroweak interactions is attempted. In particular, the effects of introducing an energy scale intermediate between the unification energy and the low-energy regions are studied and found to be important. This analysis is applied to unification schemes of both kinds, namely, unification at superhigh energies, and unification at accessible energies.
Volume 16 Issue 3 March 1981 pp 249-255 Particle Physics
Symmetry breaking for the
Jatinder K Bajaj M P Khanna K Prema
Using the consistency requirements arising from the Coleman-Glashow null result for ‘tadpole’-type symmetry-breaking, we obtain a simple method of accounting for the SU(3) symmetry-breaking at the
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