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Collected Works: Recent submissions

  • Seesaw fermion masses in an SO(10) grand unified theory 
    Bhattacharya K.; Sarkar U.; Das C.R.; Rajasekaran G.; Desai B.R. (2006)
    In this work we study an SO(10) GUT model with minimum Higgs representations belonging only to the 210 and 16 dimensional representations of SO(10). We add a singlet fermion S in addition to the usual 16 dimensional ...
  • Three flavor implications of the result of the CHOOZ Collaboration 
    Narayan M.; Rajasekaran G.; Sankar S.U. (American Institute of Physics Inc., 1998)
    We analyze the recent result of the CHOOZ Collaboration in the context of mixing and oscillations between all the three neutrino flavors. If one assumes the hierarchy among the vacuum mass eigenvalues δ21≪δ31 where δ21=μ22-μ21 ...
  • Constraints on mixing angles of Majorana neutrinos 
    Adhikari R.; Rajasekaran G. (2000)
    By combining the inputs from the neutrinoless double beta decay and the fits of cosmological models of dark matter with solar and atmospheric neutrino data, we obtain constraints on two of the mixing angles of Majorana ...
  • New forms of quantum statistics 
    Mishra A.K.; Rajasekaran G. (Indian Academy of Sciences, Bangalore, 1992)
    We propose a new two-parameter deformation of the algebra of creation and destruction operators, which allows the construction of a new family of Hillbert spaces with positive definite inner product. This provides a ...
  • Radiative stability of neutrino-mass textures 
    Parida M.K.; Das C.R.; Rajasekaran G. (Indian Academy of Sciences, Bangalore, 2004)
    Neutrino-mass textures proposed at high scales are known to be unstable against radiative corrections especially for nearly degenerate mass eigenvalues. We find a mechanism in a class of gauge models including 2HDM where ...
  • Erratum: Algebra for fermions with a new exclusion principle 
    Mishra A.K.; Rajasekaran G. (Indian Academy of Sciences, Bangalore, 1991)
    [No abstract available]
  • Threshold effects on quasidegenerate neutrinos with high-scale mixing unification 
    Mohapatra R.N.; Parida M.K.; Rajasekaran G. (American Physical Society, 2005)
    We consider threshold effects on neutrino masses and mixings in a recently proposed model for understanding large solar and atmospheric mixing angles using radiative magnification for the case of quasidegenerate neutrinos. ...
  • A new mechanism for neutrino mass 
    Divakaran P.P.; Rajasekaran G. (World Scientific Publishing Co. Pte Ltd, 1999)
    A mechanism for generating massive but naturally light Dirac neutrinos is proposed. It involves composite Higgs within the standard model as well as some new interaction beyond the standard model. According to this scenario, ...
  • Time-of-night variation of solar neutrinos 
    Narayan M.; Rajasekaran G.; Sinha R. (World Scientific Publishing Co. Pte Ltd, 1998)
    We investigate the time-of-night variation of solar neutrino rate which will be of relevance to super-Kamioka and Sudbury neutrino detectors in the framework of oscillations among the three flavors. An analytical method ...
  • Generalized Fock spaces, new forms of quantum statistics and their algebras 
    Mishra A.K.; Rajasekaran G. (Indian Academy of Sciences, Bangalore, 1995)
    We formulate a theory of generalized Fock spaces which underlies the different forms of quantum statistics such as ‘infinite’, Bose-Einstein and Fermi-Dirac statistics. Single-indexed systems as well as multi-indexed systems ...
  • Validity of the equivalent-photon approximation for the production of massive spin-1 particles 
    Jayaraman T.; Rajasekaran G.; Rindani S.D. (Indian Academy of Sciences, Bangalore, 1986)
    We point out that the equivalent-photon approximation (EPA) for processes with massive spin-1 particles in the final state would have validity in a more restricted kinematic domain than for processes where it is commonly ...
  • Stability of the S matrix pole 
    Rajasekaran G.; Vasan S.S. (Indian Academy of Sciences, Bangalore, 1990)
    We show how the position and residue of the S matrix pole can remain stable under changes in the form of the parametrization of the S matrix elements. We also derive a relation among the shifts in the Breit-Wigner resonance ...
  • Higgs couplings in the integer-charge quark model 
    Lakshmibala S.; Rajasekaran G. (Indian Academy of Sciences, Bangalore, 1986)
    Colour SU(3) symmetry is broken spontaneously by the introduction of coloured Higgs scalars in the standard SU(3)×SU(2)×U(1) model, so as to make the quarks integrally charged. The resulting couplings of the Higgs bosons ...
  • One-pion events by atmospheric neutrinos: A three-flavor analysis 
    Balaji K.R.S.; Rajasekaran G.; Umasankar S. (World Scientific Publishing Co. Pte Ltd, 2001)
    We study the one-pion events produced via neutral current (NC) and charged current (CC) interactions by the atmospheric neutrinos. We analyze the ratios of CC events to the NC events in the framework of neutrino oscillations. ...
  • Double threefold degeneracies for active and sterile neutrinos 
    Ma E.; Rajasekaran G. (2001)
    We explore the possibility that the three active (doublet) neutrinos have nearly degenerate masses which are split only by the usual seesaw mechanism from three sterile (singlet) neutrinos in the presence of a softly broken ...
  • Softly broken A4 symmetry for nearly degenerate neutrino masses 
    Ma E.; Rajasekaran G. (American Physical Society, 2001)
    The leptonic Higgs doublet model of neutrino masses is implemented with an A4 discrete symmetry (the even permutation of four objects or equivalently the symmetry of the tetrahedron) which has four irreducible representations: ...
  • Light unstable sterile neutrino 
    Ma E.; Rajasekaran G. (American Physical Society, 2001)
    The three massless active (doublet) neutrinos may mix with two heavy and one light sterile (singlet) neutrino so that the induced masses and mixings among the former are able to explain the present data on atmospheric and ...
  • An algebra for ordered particles 
    Mishra A.K.; Rajasekaran G. (1995)
    We construct an algebra of creation and destruction operators for a system whose multiparticle states have the property that the permutation of coordinates is forbidden. Although this "null statistics" can be related to a ...
  • Quantum interference effects in a generalised Kaluza-Klein theory 
    Parthasarathy R.; Nagarajan R.; Rajasekaran G. (1987)
    The change in the phase of the wavefunction of a test particle in a (4+n)-dimensional Kaluza-Klein theory is computed. It is found to contain the gravitational and non-Abelian phase shifts separately and simultaneously.
  • e+e-→γ+2 jets as a test of quark charges 
    HE X.G.; Pakvasa S.; Rajasekaran G.; Rindani S.D. (1987)
    It is shown that angular distribution in e+e-→γ+2 jets can serve as a possible test of quark charges but only above color threshold. © 1987.

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