Searches for Long Lived Neutral Particles (2009)
Meade, Patrick, Nussinov, Shmuel, Papucci, Michele, Volansky, Tomer
An intriguing possibility for TeV scale physics is the existence of neutral long lived particles (LOLIPs) that subsequently decay into SM states. Such particles are many cases indistinguishable from...
Quantum interference experiments, modular variables and weak measurements (2009)
Tollaksen, Jeff, Aharonov, Yakir, Casher, Aharon, Kaufherr, Tirzah, Nussinov, Shmuel
We address the problem of interference using the Heisenberg picture and highlight some new aspects through the use of pre-selection, post-selection, weak measurements, and modular variables, We...
Some Comments on the `Quirks' Scenario (2009)
Nussinov, Shmuel, Jacoby, Chen
We discuss various aspects of models with long-lived or stable colored particles. In particular we focus on an ideal Quirk model with electroweak neutral heavy (O(TeV)) particles which carry ordinary...
Characterizing Planar Graphs (2009)
Gudkov, Vladimir, Nussinov, Shmuel, Nussinov, Zohar
Cataloging planar diagrams using the depth concept is proposed.
Some Aspects of New CDM Models and CDM Detection Methods (2009)
We briefly review some recent Cold Dark Matter (CDM) models. Our main focus are charge symmetric models of WIMPs which are not the standard SUSY LSP's (Lightest Supersymmetric Partners). We indicate...
Estimate of the Branching Fraction of tau --> pi eta' nu_tau (2009)
Nussinov, Shmuel, Soffer, Abner
We calculate the expected branching fraction of the second-class-current decay tau --> pi eta' nu, motivated by a a recent experimental upper-limit determination of this quantity. The largest...
The ongoing experimental efforts in the high energy and high precision communities keep providing evidence for CPT, a fundamental symmetry holding in any local Lorentz invariant theory. We suggest...
Yuval Ne'eman and How He Influenced My Life and Career (2009)
An early phase of theoretical high energy physics in Israel specifically that connected with Yuval Ne'eman and a small group of my classmates, myself, and several others who worked around him after...
Limit on Neutrino Emission from Neutron Stars (2009)
Goldman, Itzhak, Nussinov, Shmuel
The timing data of the binary pulsar PSR1913+16, are used to establish an upper limit on the rate of neutrino emission from neutron stars. Neutrino emission from each of the neutron stars of the...
Gluon-Glueball Duality and Glueball Searches (2009)
Nussinov, Shmuel, Shrock, Robert
We discuss a notion of gluon-glueball duality analogous to quark-hadron duality. We apply this idea to the radiative decay of heavy orthoquarkonium, $Q\bar Q \to \gamma g g$, which has been used to...
We consider Wimp annihilations into monochromatic and continuous $\gamma$'s and the angular distribution of the resulting gammas. We discuss how the WIMP density profile can be reconstructed from the...
Some Aspects of Classical and Quantum Phases (2009)
Aharonov, Yakir, Kaufherr, Tirzah, Nussinov, Shmuel
We study classical and quantum phases in the adiabatic Born-Oppenheimer context. These include a classical astronomical case, the general dual description of the phases, a new "Paradox" connected to...
QCD effects on "stable" micro black holes at the LHC (2009)
Goldman, Itzhak, Grossman, Yuval, Nussinov, Shmuel
If Micro Black Holes (MBHs) can be produced at the LHC, they will decay very fast. We study hypothetical MBHs that do not decay; in particular, QCD effects on accretion by MBHs that are produced at...
Capture of Inelastic Dark Matter in the Sun (2009)
Nussinov, Shmuel, Wang, Lian-Tao, Yavin, Itay
We consider the capture of dark matter in the Sun by inelastic scattering against nuclei as in the inelastic dark matter scenario. We show that, assuming a WIMP-nucleon cross-section of \sigma_n =...
Chen, Shao-Long, Mohapatra, Rabindra N., Nussinov, Shmuel, Zhang, Yue
We propose a new class of R-parity violating extension of MSSM with type II seesaw mechanism for neutrino masses where an unstable gravitino is the dark matter of the Universe. It decays...
Some Comments on Possible Preferred Directions for the SETI Search (2009)
The search for extraterrestrial intelligence by looking for signals from advanced technological civilizations has been ongoing for some decades. We suggest that it could possibly be made more...
On the $\pi$ and $K$ as $q \bar q$ Bound States and Approximate Nambu-Goldstone Bosons (2008)
Nussinov, Shmuel, Shrock, Robert
We reconsider the two different facets of $\pi$ and $K$ mesons as $q \bar q$ bound states and approximate Nambu-Goldstone bosons. We address several topics, including masses, mass splittings between...
A Model With Dynamical R-parity Breaking and Unstable Gravitino Dark Matter (2008)
Ji, Xiangdong, Mohapatra, Rabindra N., Nussinov, Shmuel, Zhang, Yue
An unstable gravitino with lifetime longer than $10^{26}$ sec or so has been proposed as a possible dark matter candidate in supergravity models with R-parity breaking. We find a natural realization...
Searching direction dependent daily modulation in dark matter detectors (2008)
Avignone III, Frank T., Creswick, Richard J, Nussinov, Shmuel
Channeling of recoil ions in various crystals strongly depends on their direction. This, along with the WIMP wind due to the rotation of the galactic disc generates {\it daily} modulations of the...
Nussinov, Shmuel, Soffer, Abner
We consider the ``second-class current'' decay $\tau^-\to\pi^-\eta\nu_\tau$ from several points of view. We first focus on the decay rate as expected within standard weak interaction and QCD due to...
Is the Froissart bound relevant for the total pp cross section at s=(14 TeV)^2? (2008)
The Froissart bound limmits the asymptotic s->infinity behavior of crossections by (\pi/t_0) ln ^2 (s/{(s_0)} where t_0 is the lightest exchanged particle, or more generally the nearest ssingularity,...
The Relic Abundance of Massive Colored Particles after a Late Hadronic Annihilation Stage (2007)
Jacoby, Chen, Nussinov, Shmuel
We discuss the relic abundance of massive long lived colored particles with mass of the order of 1 TeV. We first examine the case where the massive colored particles have the standard color only....
Some Comments on an MeV Cold Dark Matter Scenario (2007)
Jacoby, Chen, Nussinov, Shmuel
We discuss several aspects of astroparticle physics pertaining to a new model with MeV cold dark matter particles, which annihilate to electron-positron pairs in a manner yielding the correct CDM...
Jacoby, Chen, Nussinov, Shmuel
We estimate the amount of antiprotons and positrons in cosmic rays due to neutralino annihilations in the galactic halo assuming that dark matter tends to cluster and that these clusters are not...
On photon splitting in theories with Lorentz invariance violation (2005)
Gelmini, Graciela, Nussinov, Shmuel, Yaguna, Carlos E.
In a model with Lorentz invariance violation implemented through modified dispersion relations, we estimate the rate for the decay process gamma -> 3 gamma and find that it provides a relevant bound...
The BCS - BEC Crossover In Arbitrary Dimensions (2004)
Nussinov, Zohar, Nussinov, Shmuel
Cold atom traps and certain neutron star layers may contain fermions with separation much larger than the range of pair-wise potentials yet much shorter than the scattering length. Such systems can...
Non-Relativistic Bose-Einstein Condensates, Kaon droplets, and Q- Balls (2004)
Nussinov, Zohar, Nussinov, Shmuel
We note the similarity between BEC (Bose-Einstein Condensates) formed of atoms between which we have long-range attraction (and shorter-range repulsions) and the field theoretic "Q balls". This...
"Atmospheric Neutrino" and "Proton Decay" Data Exclude Some New Dark Matter Scenarios (2004)
Goldman, Itzhak, Nussinov, Shmuel
Models in which the "dark" halo particles have mutual and potentially also appreciable nuclear interactions have been considered by various authors. In this note we briefly point out strategies for a...
Are Bulk Axions in Models with Extra, Large, Compact Dimensions Observable? (2004)
The high degeneracy of KK modes in models which have bulk axions moving in some extra, compact dimensions which are larger than O (Angstrom)strongly tightens the supernova upper bounds on the axion...
Production of the X(3872) in B Meson Decay by the Coalescence of Charm Mesons (2004)
Braaten, Eric, Kusunoki, Masaoki, Nussinov, Shmuel
If the recently-discovered charmonium state X(3872) is a loosely-bound S-wave molecule of the charm mesons \bar D^0 D^{*0} or \bar D^{*0} D^0, it can be produced in B meson decay by the coalescence...
Some (further) Comments on the Theta(1540) Pentaquark (2004)
Additional broader I=0 states in the KN channel near $\Theta^+$(1540) are expected in many models, making the absence of any signature in the K$^+$-deuteron scattering data even more puzzling. In an...
New near-threshold mesons (2003)
Cohen, Thomas D., Gelman, Boris A., Nussinov, Shmuel
We show that under a number of rather plausible assumptions QCD spectrum may contain a number of mesons which have not been predicted or observed. Such states will have the quantum numbers of two...
The Narrow Theta(1543)--A QCD Dilemma: Tube or Not Tube? (2003)
Casher, Aharon, Nussinov, Shmuel
We argue that a width of less than MeV of the new Theta resonance is inconsistent with the observed ratio of resonance and background events in the various photon initiated experiments if the latter...
A Novel Approach Applied to the Largest Clique Problem (2002)
Gudkov, Vladimir, Nussinov, Shmuel, Nussinov, Zohar
A novel approach to complex problems has been previously applied to graph classification and the graph equivalence problem. Here we apply it to the NP complete problem of finding the largest perfect...
Does A Narrow Tetraquark $cc\bar{u}\bar{d}$ State Exist? (2002)
Gelman, Boris A., Nussinov, Shmuel
The existence of a shallow or virtual tetraquark state, $cc\bar{u}\bar{d}$, is discussed. Using the putative masses for the doubly charmed baryons ($ccu/ccd$) from SELEX, the mass of the...
A Novel Approach to Complex Problems (2002)
Nussinov, Shmuel, Nussinov, Zohar
A novel approach to complex problems has been previously applied to graph classification and the graph equivalence problem. Here we consider its applications to a wide set of NP complete problems,...
Approaches to Network Classification (2002)
Gudkov, Vladimir, Johnson, Joseph E., Nussinov, Shmuel
We introduce a novel approach to description of networks/graphs. It is based on an analogue physical model which is dynamically evolved. This evolution depends on the connectivity matrix and readily...
Graph equivalence and characterization via a continuous evolution of a physical analog (2002)
Gudkov, Vladimir, Nussinov, Shmuel
A general novel approach mapping discrete, combinatorial, graph-theoretic problems onto ``physical'' models - namely $n$ simplexes in $n-1$ dimensions - is applied to the graph equivalence problem....
Experimental identification of non-pointlike dark-matter candidates (2002)
Gelmini, Graciela, Kusenko, Alexander, Nussinov, Shmuel
We show that direct dark matter detection experiments can distinguish between pointlike and non-pointlike dark-matter candidates. The shape of the nuclear recoil energy spectrum from pointlike...
QCD and e+e- --> Baryon + anti-Baryon (2002)
Karliner, Marek, Nussinov, Shmuel
We discuss the QCD constraints on e+e- --> baryon-anti-baryon close to threshold, in light of the puzzling experimental data which indicate that close to threshold sigma (e+e- --> n n-bar) > sigma...
n-nbar Oscillations in Models with Large Extra Dimensions (2001)
Nussinov, Shmuel, Shrock, Robert
We analyze $n - \bar n$ oscillations in generic models with large extra dimensions in which standard-model fields propagate and fermion wavefunctions have strong localization. We find that in these...
Coherent Decays of Atoms (2001)
Aharonov, Yakir, Anandan, Jeeva, Nussinov, Shmuel
The prolongation and shortening of lifetimes of atoms due to quantum coherence between atoms is examined. These effects are shown to follow simply from the unitarity of time evolution. Possible...
Expected Signals in Relic Neutrino Detectors (2001)
Duda, Gintaras, Gelmini, Graciela, Nussinov, Shmuel
Here we estimate the magnitude of the signals expected for realistic cosmic neutrino backgrounds in detectors attempting to measure the mechanical forces exerted on macroscopic targets by the elastic...
On High-Energy Behavior of Cross Sections in Theories with Large Extra Dimensions (2001)
Nussinov, Shmuel, Shrock, Robert
We discuss the high-energy behavior of cross sections in theories with large extra dimensions and low-scale quantum gravity, addressing two particular issues: (i) the tension of the D-branes, and...
Nussinov, Shmuel, Lampert, Melissa A.
We review the subject of QCD inequalities, using both a Hamiltonian variational approach, and a rigorous Euclidean path integral approach.
Some Remarks on Theories with Large Compact Dimensions and TeV-Scale Quantum Gravity (1998)
Nussinov, Shmuel, Shrock, Robert
We comment on some implications of theories with large compactification radii and TeV-scale quantum gravity. These include the behavior of high-energy gravitational scattering cross sections and...
A New Variant of the Casimir Effect and Its Exact Evaluation (1998)
Kenneth, Oded, Nussinov, Shmuel
A new version of the Casimir effect where the two plates conduct in specific, different, directions is considered. By direct functional integration the evaluation of the Casimir energy as a function...
Is the Planck Momentum Attainable? (1997)
Casher, Aharon, Nussinov, Shmuel
We present evidence that an interplay of the laws of microphysics and cosmology renders the Planck momentum unattainable by an elementary particle. Several categories of accelerators are analyzed and...
Mohapatra, Rabindra N., Nussinov, Shmuel
Recent experimental searches for neutrino mass in tritium beta decay yield a negative value for the mass-squared of the electron neutrino. If this effect is genuine, then it is hard to understand it...
Comments on glueballinos (R0 particles) and R0 searches (1996)
We propose a search strategy for the light R0 (glueballino) particle suggested by G.Farrar in connection with the light gluino scenario. The basic idea is to moderate and stop the R0 particles and...
Coherence Effects in Neutrino Oscillations (1995)
Kiers, Ken, Nussinov, Shmuel, Weiss, Nathan
We study the effect of coherent and incoherent broadening on neutrino oscillations both in vacuum and in the presence of matter (the MSW effect). We show under very general assumptions that it is not...
The study of the Bethe-Salpeter equation in scalar field theories and high energy scattering. (1966)
Thesis (Ph. D.)--University of Washington.