arXiv subjects

M. Sher

Publications and source records attributed to M. Sher.

7 recordsLinked to original sources

arXiv2013

On The Limits Of Perfect Security For Steganographic System

Until now the discussion on perfect security for steganographic systems has remained confined within the realm of mathematicians and information theory experts whose concise and symbolic representation of their philosophies, postulates, and inference thereafter has made it hard for the na\"ive academics to have an insight of the concepts. This paper is an endeavor not only to appraise on the limitations of one of such pioneer comprehensions but also to illustrate a pitfall in another scheme that asserts on having perfect security without the use of public or secret key. Goals set are accomplished through contrasting test results of a steganographic scheme that exploits English words with corresponding acronyms for hiding bits of secret information in chat - a preferred way to exchange messages these days. The misapprehension about perfect security and reign in characteristic of stego key in bit embedding process are unfolded respectively by launching elementary chosen-message and chosen-cover attack, and through proposed enhancement of target scheme.

cs.CR↗

arXiv2011

Collider phenomenology of the E6SSM

We consider collider signatures of the exceptional supersymmetric (SUSY) standard model (E6SSM). This E6 inspired SUSY model is based on the SM gauge group together with an extra U(1) gauge symmetry under which right--handed neutrinos have zero charge. To ensure anomaly cancellation and gauge coupling unification the low energy matter content of the E6SSM involve extra exotic matter beyond the MSSM. We discuss the collider signatures associated with the production of new particles predicted by the E6SSM and consider the implications of this model for dark matter and Higgs phenomenology. Since exotic quarks in the E6SSM can be either diquarks or leptoquarks they may provide spectacular new physics signals at the LHC.

hep-ph↗

arXiv2011

Nonstandard Higgs Decays and Dark Matter in the E6SSM

We study the decays of the lightest Higgs boson within the exceptional supersymmetric (SUSY) standard model (E6SSM). The E6SSM predicts three families of Higgs-like doublets plus three SM singlets that carry U(1)_{N} charges. One family of Higgs-like doublets and one SM singlet develop vacuum expectation values. The fermionic partners of other Higgs-like fields and SM singlets form inert neutralino and chargino states. Two lightest inert neutralinos tend to be the lightest and next-to-lightest SUSY particles (LSP and NLSP). The considered model can account for the dark matter relic abundance if the lightest inert neutralino has mass close to half the Z mass. In this case the usual SM-like Higgs boson decays more than 95% of the time into either LSPs or NLSPs. As a result the decays of the lightest Higgs boson into l^{+} l^{-} + X might play an essential role in the Higgs searches. This scenario also predicts other light inert chargino and neutralino states below 200 GeV and large LSP direct detection cross-sections which is on the edge of observability of XENON100.

hep-ph↗

arXiv2010

Nonstandard Higgs decays in the E(6)SSM

We study the nonstandard decays of the lightest Higgs state within the Exceptional Supersymmetric Standard Model (E6SSM). We argued that the SM--like Higgs boson can decay predominantly into dark matter particles while its branching ratios into SM particles varies from 2% to 4%. This scenario also implies the presence of other relatively light Inert chargino and neutralino states in the particle spectrum with masses below 200 GeV. We argue that in this case the decays of the lightest Higgs boson into l^{+} l^{-} + X may play an essential role in the Higgs searches.

hep-ph↗

arXiv2010

Novel Higgs Decays and Dark Matter in the E(6)SSM

The Exceptional Supersymmetric (SUSY) Standard Model predicts three families of Higgs doublets plus three Higgs singlets, where one family develops vacuum expectation values (VEVs), while the remaining two which do not are called Inert. The model can account for the dark matter relic abundance if the two lightest Inert neutralinos, identified as the (next-to) lightest SUSY particles ((N)LSPs), have masses close to half the Z mass. In this case we find that the usual SM-like Higgs boson decays more than 95% of the time into either LSPs or NLSPs. The latter case produces a final state containing two leptons l^{+}l^{-} with an invariant mass less than or about 10 GeV. We illustrate this scenario with a set of benchmark points satisfying phenomenological constraints and the WMAP dark matter relic abundance. This scenario also predicts other light Inert chargino and neutralino states below 200 GeV, and large LSP direct detection cross-sections close to current limits and observable soon at XENON100.

hep-ph↗

arXiv2004

The Two Higgs Doublet Model and the Multiple Point Principle

According to the multiple point principle, Nature adjusts coupling parameters so that many vacuum states exist and each has approximately zero vacuum energy density. We apply this principle to the general two-Higgs doublet extension of the Standard Model, by requiring the existence of a large set of degenerate vacua at an energy scale much higher than the presently realized electroweak scale vacuum. It turns out that two scenarios are allowed. In the first scenario, a CP conserving Higgs potential and the absence of flavour changing neutral currents are obtained without fine-tuning. In the second scenario, the photon becomes massive in the high scale vacua. We briefly discuss the resulting phenomenology.

hep-ph↗

arXiv2004

Proceedings to the 7th Workshop 'What Comes Beyond the Standard Models', 19. - 31. July 2004, Bled, Slovenia

1. Predictions for Four Generations of Quarks Suggested by the Approach Unifying Spins and Charges (M. Breskvar, J. Mravlje, N.Mankoc Borstnik), 2. No-scale Supergravity and the Multiple Point Principle (C.Froggatt, L.Laperashvili, R.Nevzorov, H.B.Nielsen), 3. The Two-Higgs Doublet Model and the Multiple Point Principle (C.Froggatt, L.Laperashvili, R.Nevzorov, H.B.Nielsen, M.Sher), 4. New Physics From a Dynamical Volume Element (E. Guendelman, A. Kaganovich, E. Nissimov and S. Pacheva), 5. Randomness in Random Dynamics (A. Kleppe), 6. An Example of Kaluza-Klein-like Theories Leading After Compactification to Massless Spinors Coupled to a Gauge Field-Derivations and Proofs (N. Mankoc Borstnik, H. B. Nielsen and D. Lukman), 7. Geometry Decides Gravity, Demanding General Relativity-it is Thus the Quantum Theory of Gravity (R. Mirman), 8. Physics Would Be Impossible in Any Dimension But 3+1 - There Could Be Only Empty Universes (R. Mirman),9. Conservation of Energy Prohibits Proton Decay (R. Mirman), 10. Approximate Solutions for the Higgs Masses and Couplings in the NMSSM (R. Nevzorov and D.J. Miller)

hep-ph↗