Recently added

DSpace at IMSc: Recent submissions

  • Non-renormalization of the weak vertex in gauge theories with integrally charged quarks 
    Rajasekaran G.; Sri Ram M.S. (Indian Academy of Sciences, Bangalore, 1982)
    We give current algebra arguments to show that to O(α) the colour octet vertices do not renormalize the effective weak vertex between colour singlet hadrons in models with broken colour symmetry. The result does not depend ...
  • Decays of W and Z in the broken-colour model 
    Lakshmibala S.; Rajasekaran G.; Rindani S.D. (Indian Academy of Sciences, Bangalore, 1985)
    The two-gluonic decay modes of W and Z in the broken colour model with integrally charged quarks are considered. The gluonic branching ratios are found to be 3% and 2·7% for W and Z respectively. The angular distributions ...
  • Erratum: Analysis of the neutral-current interaction in the inclusive neutrino reaction 
    Rajasekaran G.; Sarma K.V.L. (Indian Academy of Sciences, Bangalore, 1974)
    [No abstract available]
  • Phenomenology of neutrino oscillations 
    Rajasekaran G. (Indian Academy of Sciences, Bangalore, 2000)
    The phenomenology of solar, atmospheric, supernova and laboratory neutrino oscillations is described. Analytical formulae for matter effects are reviewed. The results from oscillations are confronted with neutrinoless ...
  • Interpretation of the recent Kolar events 
    Joshipura A.S.; Rajasekaran G.; Gupta V.; Sarma K.V.L. (Indian Academy of Sciences, Bangalore, 1989)
    We give plausible interpretations of the unusual events seen in the proton decay detector at Kolar Gold Fields indicating the existence of a massive (≳2GeV) long lived (10-8-10-9s) particle. We show that it is possible to ...
  • Radiative magnification of neutrino mixings in split supersymmetry 
    Mohapatra R.N.; Parida M.K.; Rajasekaran G. (2005)
    Radiative corrections to neutrino mixings in seesaw models depend on the nature of new physics between the weak and the grand unified theory (GUT)-seesaw scales and can be taken into account using the renormalization group ...
  • An SO(10) GUT with see-saw masses for all fermions 
    Desai B.R.; Rajasekaran G.; Sarkar U. (2005)
    We propose an SO(10) grand unified theory in which all fermions acquire see-saw masses. We include only two Higgs scalars, a 210-plet and a 16-plet. In addition to the regular fermions we include one singlet per generation, ...
  • Solar and atmospheric neutrino oscillations with three flavors 
    Narayan M.; Murthy M.V.N.; Rajasekaran G.; Umasankar S. (1996)
    We analyze the solar and the atmospheric neutrino problems in the context of three flavor neutrino oscillations. We assume a mass hierarchy in the vacuum mass eigenvalues (formula presented), but make no approximation ...
  • High scale mixing unification and large neutrino mixing angles 
    Mohapatra R.N.; Parida M.K.; Rajasekaran G. (2004)
    Starting with the hypothesis that quark and lepton mixings are identical at or near the grand unified theory scale, we show that the large solar and atmospheric neutrino mixing angles together with the small reactor angle ...
  • Neutrinos from stellar collapse: Comparison of the effects of three and four flavor mixings 
    Dutta G.; Indumathi D.; Murthy M.V.N.; Rajasekaran G. (2000)
    We study the effect of non-vanishing masses and mixings among neutrino flavors on the detection of neutrinos from stellar collapse by a water Cherenkov detector. We consider a framework in which there are four neutrino ...
  • Neutrinos from stellar collapse: Effects of flavor mixing 
    Dutta G.; Indumathi D.; Murthy M.V.N.; Rajasekaran G. (2000)
    We study the effect of nonvanishing masses and mixings among neutrino flavors on the detection of neutrinos from stellar collapse by a water Cherenkov detector. We consider a realistic framework in which there are three ...
  • Hexagonal SU(3) unification and its manifestation at the TeV scale 
    Cao Q.-H.; Chen S.-L.; Ma E.; Rajasekaran G. (American Physical Society, 2006)
    We consider SU(3)C×SU(2)AL×SU(2)BL×U(1)Y as the low-energy subgroup of supersymmetric SU(3)6 unification. This may imply small deviations from quark-lepton universality at the TeV scale, as allowed by neutron-decay data. ...
  • Solar neutrinos and the eclipse effect 
    Narayan M.; Rajasekaran G.; Sinha R.; Burgess C.P. (1999)
    The solar neutrino counting rate in a real time detector such as Super-Kamiokanda, SNO, or Borexino is enhanced due to neutrino oscillations in the Moon during a partial or total solar eclipse. The enhancement is calculated ...
  • Solar eclipse and neutrinos 
    Narayan M.; Rajasekaran G.; Sinha R. (1996)
    It is pointed out that due to neutrino oscillations the observed solar neutrino rate in the terrestrial neutrino detectors may be enhanced during a partial or total solar eclipse. The enhancement is calculated as a function ...
  • 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 ...
  • 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 ...
  • 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]