Mechanisms of Supersymmetry Breaking in the MSSM

Preliminary Remarks. Gauge mediated supersymmetry breaking. Gravity mediated supersymmetry breaking. Anomaly mediated supersymmetry breaking. Gaugino mediated supersymmetry breaking. Braneworld supersymmetry breaking. Conclusions.Comment: New references added, minor misprints corrected, text otherwise unchange

Measuring the deviation from maximal mixing of atmospheric muon neutrinos at INO

Neutrino factfile and $D \equiv 1/2 - sin^2 \theta_{23}$ $\nu_mu$, $\bar\nu_mu$ survival probabilities and binned up-down asymmetries Error analysis and sensitivity to $D$Comment: 3 pages, 3 figures, latex. Talk given at the PANIC 05 conference, Santa Fe, Oct. 24 - 28, 200

Radiative Electroweak Parameters

The status of the present precision measurements of electroweak observables is reviewed with specific reference to the radiative parameters $S,T,U$ or equivalently $\epsilon_1,\epsilon_2,\epsilon_3$. The significance of the obliqueness hypothesis is underlined and the importance of the ``local fit'' method of extracting these parameters from the data is emphasized. Possible new physics implications are briefly touched upon.Comment: (LATEX, 12 pages, 6 figures not included, available on request) TIFR preprint TIFR/TH/93-1

The magic of four zero neutrino Yukawa textures

Four is the maximum number of texture zeros allowed in the Yukawa coupling matrix of three massive neutrinos. These completely fix the high scale CP violation needed for leptogenesis in terms of that accessible at laboratory energies. $\mu\tau$ symmetry drastically reduces such allowed textures. Only one form of the light neutrinos mass matrix survives comfortably while another is marginally allowed.Comment: 7 pages, 2 figures, Talk given at the "CTP International Conference on Neutrino Physics in the LHC Era" (Luxor,Egypt, 15-19 Nov, 2009) and at "Beyond the Standard Model, 2010"(Cape Town, South Africa, Feb 1-7, 2010

Testable constraint on near-tribimaximal neutrino mixing

General lowest order perturbations to hermitian squared mass matrices of leptons are considered away from the tribimaximal (TBM) limit in which a weak flavor basis with mass diagonal charged leptons is chosen. The three measurable TBM deviants are expressed linearly in terms of perturbation induced dimensionless coefficients appearing in the charged lepton and neutrino flavor eigenstates. With unnatural cancellations assumed to be absent and the charged lepton perturbation contributions to their flavor eigenstates argued to be small, we analytically derive the following result. Within lowest order perturbations, a deviation from maximal atmospheric neutrino mixing and the amount of CP violation in neutrino oscillations cannot both be large (i.e. $12$-$17 \%$), posing the challenge of verification to forthcoming experiments at the intensity frontier.Comment: published version: JHEP 02 (2015) 13