Active and Sterile Neutrino Emission and SN1987A Pulsar Velocity (2009)
Kisslinger, Leonard S, Pakvasa, Sandip
Recently estimates have been made of the velocities of pulsars produced by the emission of sterile neutrinos during the first 10 seconds and by active neutrinos during the second 10 seconds after a...
Relating D0-anti-D0 Mixing and D0 -> l+l- with New Physics (2009)
Golowich, Eugene, Hewett, JoAnne, Pakvasa, Sandip, Petrov, Alexey A.
We point out how, in certain models, the same combination of New Physics couplings occur in the amplitudes for both D0-anti-D0 mixing and the rare decays D0 -> l+l-. If the New Physics dominates and...
Hundi, R. S., Pakvasa, Sandip, Tata, Xerxes
We present a locally supersymmetric extension of the minimal supersymmetric Standard Model (MSSM) based on the gauge group $SU(3)_C\times SU(2)_L\times U(1)_Y\times U(1)^\prime$ where, except for the...
Learned, John G., Dye, Stephen T., Pakvasa, Sandip
The science potential of a 10 kiloton deep-ocean liquid scintillation detector for ~1 MeV energy scale electron anti-neutrinos has been studied. Such an instrument, designed to be portable and...
Batygov, Mikhail, Dye, Stephen, Learned, John, Matsuno, Shigenobu, Pakvasa, Sandip, Varner, Gary
Despite the dramatic progress made in neutrino oscillation studies recently, several fundamental neutrino parameters remain either unknown or poorly measured. We discuss in detail a method for their...
The Cepheid Galactic Internet (2008)
Learned, John G., Kudritzki, R-P., Pakvasa, Sandip, Zee, A.
We propose that a sufficiently advanced civilization may employ Cepheid variable stars as beacons to transmit all-call information throughout the galaxy and beyond. One can construct many scenarios...
Galactic Neutrino Communication (2008)
Learned, John G., Pakvasa, Sandip, Zee, A.
We examine the possibility to employ neutrinos to communicate within the galaxy. We discuss various issues associated with transmission and reception, and suggest that the resonant neutrino energy...
Neutrino Flavor Goniometry by High Energy Astrophysical Beams (2008)
It is shown how high energy neutrino beams from very distant sources can be utilized to learn about many properties of neutrinos such as lifetimes, mass hierarchy, mixing, minuscule pseudo-Dirac mass...
Flavor Ratios of Astrophysical Neutrinos: Implications for Precision Measurements (2008)
Pakvasa, Sandip, Rodejohann, Werner, Weiler, Thomas
We discuss flavor-mixing probabilities and lavor ratios of high energy astrophysical neutrinos. In the first part of this paper, we expand the neutrino flavor-fluxes in terms of the small parameters...
Unitary Parametrization of Perturbations to Tribimaximal Neutrino Mixing (2008)
Pakvasa, Sandip, Rodejohann, Werner, Weiler, Thomas
Current experimental data on neutrino mixing are very well described by TriBiMaximal mixing. Accordingly, any phenomenological parametrization of the MNSP matrix must build upon TriBiMaximal mixing....
Unparticle Induced Baryon Number Violating Nucleon Decays (2007)
He, Xiao-Gang, Pakvasa, Sandip
We study baryon number violating nucleon decays induced by unparticle interactions with the standard model particles. We find that the lowest dimension operators which cause nucleon decays can arise...
Flavor Ratios of Astrophysical Neutrinos: Implications for Precision Measurements (2007)
Pakvasa, Sandip, Rodejohann, Werner, Weiler, Thomas J.
We discuss flavor-mixing probabilities and flavor ratios of high energy astrophysical neutrinos. In the first part of this paper, we expand the neutrino flavor-fluxes in terms of the small parameters...
TriMinimal Parametrization of the Neutrino Mixing Matrix (2007)
Pakvasa, Sandip, Rodejohann, Werner, Weiler, Thomas J.
Current experimental data on neutrino mixing are very well described by TriBiMaximal mixing. Accordingly, any phenomenological parametrization of the MNSP matrix must build upon TriBiMaximal mixing....
Accurate measurement of the D0-D0bar mixing parameters (2007)
Sinha, Nita, Sinha, Rahul, Browder, T. E., Deshpande, N. G., Pakvasa, Sandip
We propose a new method to determine the mass and width differences of the two D meson mass-eigenstates as well as the CP violating parameters associated with D^0-\bar{D}^0 mixing. We show that an...
Implications of D^0-\bar D^0 Mixing for New Physics (2007)
Golowich, Eugene, Hewett, JoAnne, Pakvasa, Sandip, Petrov, Alexey A.
We provide a comprehensive, up-to-date analysis of possible New Physics contributions to the mass difference $\Delta M_D$ in $D^0$-${\bar D}^0$ mixing. We consider the most general low energy...
Learned, John, Dye, Steve, Pakvasa, Sandip, Svoboda, Robert
We describe a method for determining the hierarchy of the neutrino mass spectrum and theta_13 through remote detection of antineutrinos from a nuclear reactor. This method utilizing a single, 10-kt...
Shortcuts in extra dimensions and neutrino physics (2006)
Päs, Heinrich, Pakvasa, Sandip, Weiler, Thomas J.
We discuss the possibility of sterile neutrinos taking shortcuts in extra dimensions, and the consequences for neutrino oscillations. This effect influences the active-sterile neutrino mixing and...
New Physics contributions to the lifetime difference in D0-anti-D0 mixing (2006)
Golowich, Eugene, Pakvasa, Sandip, Petrov, Alexey A.
The first general analysis of New Physics contributions to the D0-anti-D0 lifetime difference (equivalently Delta Gamma_D} is presented. The extent to which New Physics (NP) contributions to |Delta...
On the hidden charm state at 3872 MeV (2003)
Pakvasa, Sandip, Suzuki, Mahiko
We discuss some puzzling aspects of the narrow hidden charm resonance that was recently discovered by the Belle Collaboration at mass 3872 MeV. In order to determine its quantum numbers, a crucial...
Sensitivity to $\theta_{13}$ and $\delta$ in the Decaying Astrophysical Neutrino Scenario (2003)
Beacom, John F., Bell, Nicole F., Hooper, Dan, Pakvasa, Sandip, Weiler, Thomas J.
We have previously shown that the decay of high-energy neutrinos from distant astrophysical sources would be revealed by flavor ratios that deviate strongly from the...
Comment on the new $D_s^{(*)+} \pi^0$ resonances (2003)
Browder, Thomas E., Pakvasa, Sandip, Petrov, Alexey A.
We propose an explanation of the new resonances observed in $D_s^{(*)+} \pi^0$ decays. We suggest that the data can be explained by the mixing of conventional p-wave excited $D_s^+$ mesons with...
Rare Charm Decays in the Standard Model and Beyond (2001)
Burdman, Gustavo, Golowich, Eugene, Hewett, JoAnne, Pakvasa, Sandip
We perform a comprehensive study of a number of rare charm decays, incorporating the first evaluation of the QCD corrections to the short distance contributions, as well as examining the long range...
$\Lambda-\pi$ phase shift in Chiral Perturbation Theory (1998)
Datta, Alakabha, O'Donnell, Patrick, Pakvasa, Sandip
We calculate the S and P wave phase shifts in $\Lambda - \pi$ scattering at the $\Xi$ mass using the full relativistic $SU(3)_L \times SU(3)_R$ chiral perturbation theory. We get small phase shifts...
2nd Workshop on Physics and Experiments with Linear e+ e- Colliders, v.1 (1994)
Harris, Frederick A, Olsen, Stephen L, Pakvasa, Sandip, Tata, Xerxes
2nd Workshop on Physics and Experiments with Linear e+ e- Colliders, v.2 (1994)
Harris, Frederick A, Olsen, Stephen L, Pakvasa, Sandip, Tata, Xerxes
Gravitational uncertainties from dimension-six operators on supersymmetric GUT predictions (1994)
Datta, Alakabha, Pakvasa, Sandip, Sarkar, Utpal
We consider the gravity induced dimension six terms in addition to the dimension five terms in the SUSY GUT Lagrangian and find that the prediction for $\alpha_s$ may be washed out completely in...
We re-examine the neutrino decay solution to the solar neutrino problem in light of the new data from Gallex II and Kamiokande III. We compare the experimental data with the solar models of Bahcall...
7th Hawaii Topical Conference in Particle Physics (1993)
Cence, Robert J, Dobson, Peter Norman, Pakvasa, Sandip, Tuan, S F