Results for "M. T. Borgström"

total 240377took 0.24s
Diameter-dependent conductance of InAs nanowiresDec 22 2009Electrical conductance through InAs nanowires is relevant for electronic applications as well as for fundamental quantum experiments. Here we employ nominally undoped, slightly tapered InAs nanowires to study the diameter dependence of their conductance. ... More
Tunable few electron quantum dots in InAs nanowiresSep 19 2006Quantum dots realized in InAs are versatile systems to study the effect of spin-orbit interaction on the spin coherence, as well as the possibility to manipulate single spins using an electric field. We present transport measurements on quantum dots realized ... More
Measurements of strain and bandgap of coherently epitaxially grown wurtzite InAsP-InP core-shell nanowiresApr 12 2019We report on experimental determination of the strain and bandgap of InAsP in epitaxially grown InAsP-InP core-shell nanowires. The core-shell nanowires are grown via metal-organic vapor phase epitaxy. The as-grown nanowires are characterized by transmission ... More
Coulomb Blockade from the Shell of an InP-InAs Core-Shell Nanowire with a Triangular Cross SectionJan 28 2019We report on growth of InP-InAs core-shell nanowires and demonstration of the formation of single quantum structures, which show Coulomb blockade effect, over entire lengths of the nanowires. The core-shell nanowires are grown by a selective area growth ... More
Polarization Properties of Single Quantum Dots in NanowiresAug 21 2008We study the absorption and emission polarization of single semiconductor quantum dots in semiconductor nanowires. We show that the polarization of light absorbed or emitted by a nanowire quantum dot strongly depends on the orientation of the nanowire ... More
Proceedings Combined 20th International Workshop on Expressiveness in Concurrency and 10th Workshop on Structural Operational SemanticsJul 26 2013This volume contains the proceedings of the Combined 20th International Workshop on Expressiveness in Concurrency and the 10th Workshop on Structural Operational Semantics (EXPRESS/SOS 2013) which was held on 26th August, 2013 in Buenos Aires, Argentina, ... More
Proceedings Combined 21st International Workshop on Expressiveness in Concurrency and 11th Workshop on Structural Operational SemanticsAug 06 2014This volume contains the proceedings of the Combined 21st International Workshop on Expressiveness in Concurrency and the 11th Workshop on Structural Operational Semantics (EXPRESS/SOS 2014) which was held on 1st September 2014 in Rome, Italy, as an affiliated ... More
InP/InAsP Nanowire-based Spatially Separate Absorption and Multiplication Avalanche PhotodetectorsJun 03 2017Avalanche photodetectors (APDs) are key components in optical communication systems due to their increased photocurrent gain and short response time as compared to conventional photodetectors. A detector design where the multiplication region is implemented ... More
Deriving Probability Density Functions from Probabilistic Functional ProgramsApr 04 2017Jun 29 2017The probability density function of a probability distribution is a fundamental concept in probability theory and a key ingredient in various widely used machine learning methods. However, the necessary framework for compiling probabilistic functional ... More
A Lambda-Calculus Foundation for Universal Probabilistic ProgrammingDec 30 2015Jan 23 2017We develop the operational semantics of an untyped probabilistic lambda-calculus with continuous distributions, as a foundation for universal probabilistic programming languages such as Church, Anglican, and Venture. Our first contribution is to adapt ... More
A Lambda-Calculus Foundation for Universal Probabilistic ProgrammingDec 30 2015May 19 2016We develop the operational semantics of an untyped probabilistic lambda-calculus with continuous distributions, as a foundation for universal probabilistic programming languages such as Church, Anglican, and Venture. Our first contribution is to adapt ... More
Measure Transformer Semantics for Bayesian Machine LearningAug 03 2013Sep 23 2013The Bayesian approach to machine learning amounts to computing posterior distributions of random variables from a probabilistic model of how the variables are related (that is, a prior distribution) and a set of observations of variables. There is a trend ... More
A Sorted Semantic Framework for Applied Process CalculiOct 05 2015Mar 30 2016Applied process calculi include advanced programming constructs such as type systems, communication with pattern matching, encryption primitives, concurrent constraints, nondeterminism, process creation, and dynamic connection topologies. Several such ... More
Modal Logics for Nominal Transition SystemsApr 04 2019We define a general notion of transition system where states and action labels can be from arbitrary nominal sets, actions may bind names, and state predicates from an arbitrary logic define properties of states. A Hennessy-Milner logic for these systems ... More
Formation of the binary pulsars PSR B2303+46 and PSR J1141-6545 - young neutron stars with old white dwarf companionsSep 08 1999Jan 11 2000We have investigated the formation of the binary radio pulsars PSR B2303+46 and PSR J1141-6545 via Monte Carlo simulations of a large number of interacting stars in binary systems. PSR B2303+46 has recently been shown (van Kerkwijk & Kulkarni 1999) to ... More
Regulating the infrared by mode matching: A massless scalar in expanding spaces with constant decelerationJun 03 2009In this paper we consider a massless scalar field, with a possible coupling $\xi$ to the Ricci scalar in a $D$ dimensional FLRW spacetime with a constant deceleration parameter $q=\epsilon-1$, $\epsilon=-{\dot{H}}/{H^2}$. Correlation functions for the ... More
Possible Solution of the long-standing discrepancy in the Microlensing Optical Depth Toward the Galactic Bulge by correcting the stellar number countMar 18 2016Jun 21 2016We find that significant incompleteness in stellar number counts results in a significant overestimate of the microlensing optical depth $\tau$ and event rate per star per year $\Gamma$ toward the Galactic bulge from the first two years of the MOA-II ... More
Transition magnetic moments between negative parity heavy baryonsApr 30 2015The transition magnetic moments between negative parity, spin-1/2 heavy baryons are studied in framework of the light cone QCD sum rules. By constructing the sum rules for different Lorentz structures, the unwanted contributions coming from negative (positive) ... More
Determination of the $Σ$--$Λ$ mixing angle from QCD sum rulesSep 21 2015Nov 18 2015The $\Sigma$--$\Lambda$ mixing angle is calculated in framework of the QCD sum rules. We find that our prediction for the mixing angle is $(1.00\pm 0.15)^0$ which is in good agreement with the quark model prediction, and approximately two times larger ... More
Magnetic moments of heavy $J^P = {1\over 2}^+$ baryons in light cone QCD sum rulesFeb 22 2015The magnetic moments of heavy sextet $J^P = {1\over 2}^+$ baryons are calculated in framework of the light cone QCD sum rules method. Linearly independent relations among the magnetic moments of these baryons are obtained. The results for the magnetic ... More
On von Neumann spectral triplesDec 22 2000Apr 23 2011We define the notion of von Neumann spectral triple and consider the associated index problem. We compute the analytic Chern-Connes character of such a von Neumann spectral triple and prove the corresponding local formula for its Hochschild class. This ... More
Determination of the mixing angle between new charmonium statesSep 18 2014Using the pictures for $X(3872)$ as a mixture of charmonium and molecular $D^{\ast 0}D^0$ states; $Y(3940)$ as a mixture of $\chi_{c0}$ and $D^\ast D^{\prime\ast}$ states, and $Y(4260)$ as a mixture of the tetra-quark state with charmonium states, the ... More
Semileptonic decays of pseudoscalar mesons to scalar "f_0" mesonJan 15 2007The transition form factors of (D_s -> f_0 l nu), (D -> f_0 l nu) and (B_u -> f_0 l nu) decays are calculated in 3-point QCD sum rule method, assuming that "f_0" is a quark-antiquark state with a mixture of strange and light quarks. The branching ratios ... More
More about on the short distance contribution to the "B_c -> B_u^* gamma" decayJul 31 1999Feb 18 2000We calculate the transition form factor for the 'B_c -> B_u^* gamma' decay taking into account only the short distance contribution, in framework of QCD sum rules method. We observe that the transition form factor predicted by the QCD sum rules method ... More
Pion--baryon coupling constants in light cone QCD sum rulesApr 11 1999May 30 1999We calculate the "pi Sigma Lambda" and "pi Sigma Sigma" coupling constants in light cone QCD sum rules for the structure "sigma_{alpha beta} gamma_5 p^alpha q^beta". A comparison of our results on these coupling constants with prediction of the SU(3) ... More
Exclusive B -> pi e^+ e^- and B -> rho e^+ e^-Dec 07 1998We investigate the exclusive B -> pi e^+ e^- and B -> rho e^+ e^- decays in framework of the general two Higgs doublet model (model III), in which an extra phase angle in the charged--Higgs fermion coupling, i.e., a new source for CP violation exists. ... More
P-odd asymmetries in polarized (Lambda_b -> Lambda l^+ l^-) decayOct 11 2005We calculate various P-odd asymmetries appearing in the differential decay width for the cascade decay (Lambda_b -> Lambda(-> a+b) V^* (-> l^+ l^-)) with polarized and unpolarized heavy baryons including new vector type interactions and using the helicity ... More
Neutrino-electron scattering in noncommutative spaceNov 24 2010Neutral particles can couple with the $U(1)$ gauge field in the adjoint representation at the tree level if the space-time coordinates are noncommutative (NC). Considering neutrino-photon coupling in the NC QED framework, we obtain the differential cross ... More
Confronting QCD Instantons with HERA DataJul 04 1997The sensitivity of existing HERA data on the hadronic final state in deep-inelastic scattering (DIS) to processes induced by QCD instantons is systematically investigated. The maximally allowed fraction of such processes in DIS is found to be on the percent ... More
Footpoint versus loop-top hard X-ray emission sources in solar flaresOct 13 2006The hard X-ray flux ratio R of the footpoint sources to the loop-top source has been used to investigate non-thermal electron trapping and precipitation in solar flares. Considering the mission-long Yohkoh Hard X-ray Telescope database, from which we ... More
Baryogenesis from `electrogenesis' in a scalar field dominated epochMar 20 2000Scalar fields can play a dominant role in the dynamics of the Universe until shortly before nucleosynthesis. Examples are provided by domination by a kinetic mode of a scalar field, which may be both the inflaton and the late time `quintessence', and ... More
Semiclassical Mechanics of RotonsMay 01 2001The elementary excitations in superfluid liquid He-4 named rotons have an unusual dispersion curve. The energy is an approximately quadratic function of (p-p_0), the difference between the magnitude of the momentum p and a characteristic value p_0. As ... More
Null vectors of the superconformal algebra: the Ramond sectorJun 06 1993We consider the Ramond sector of the $N=1$ superconformal algebra and find expressions for the singular vectors in reducible highest weight Verma module representations by the fusion principle of Bauer et al.
Shimura varieties with $Γ_1(p)$-level via Hecke algebra isomorphisms: the Drinfeld caseMay 14 2010Apr 07 2011We study the local factor at p of the semi-simple zeta function of a Shimura variety of Drinfeld type for a level structure given at p by the pro-unipotent radical of an Iwahori subgroup. Our method is an adaptation to this case of the Langlands-Kottwitz ... More
Sixth-Order Vacuum-Polarization Contribution to the Lamb Shift of the Muonic HydrogenDec 21 1998Feb 04 1999The sixth-order electron-loop vacuum-polarization contribution to the $2P_{1/2} - 2S_{1/2}$ Lamb shift of the muonic hydrogen ($\mu^{-} p^+$ bound state) has been evaluated numerically. Our result is 0.007608(1) meV. This eliminates the largest uncertainty ... More
Radiative Corrections to the Muonium Hyperfine Structure. II. The $α(Zα)^2 $ CorrectionFeb 02 1997Feb 04 1997This is the second of a series of papers on the radiative corrections of order $\alpha^2 (Z\alpha)$, $\alpha (Z\alpha )^2$, and various logarithmic terms of order $\alpha^4$, to the hyperfine structure of the muonium ground state. This paper deals with ... More
Accuracy of Calculations Involving $α^3$ Vacuum-Polarization Diagrams: Muonic Hydrogen Lamb Shift and Muon $g-2$Dec 21 1998Apr 28 1999The contribution of the $\alpha^3$ single electron-loop vacuum-polarization diagrams to the Lamb shift of the muonic hydrogen has been evaluated recently by two independent methods. One uses the exact parametric representation of the vacuum-polarization ... More
Naive Drell-Yan and Its SuccessorOct 06 1998We review the development in the field of lepton pair production since proposing parton-antiparton annihilation as the mechanism of massive lepton pair production. The basic physical picture of the Drell-Yan model has survived the test of QCD, and the ... More
Enhancement of Critical Slowing Down in Chiral Phase Transition -- Langevin Dynamics Approach --Apr 16 2004Jun 21 2004We derive the linear Langevin equation that describes the behavior of the fluctuations of the order parameter of the chiral phase transition above the critical temperature by applying the projection operator method to the Nambu-Jona-Lasinio model at finite ... More
Random backaction in tunneling of single electrons through nanostructuresMay 23 2011We derive an $n$-resolved Master equation for quantum transport that includes a dependence on the number $n$ of tunneled electrons in system parameters such as tunnel rates and energy levels. We apply the formalism to describe dynamical changes due to ... More
Creation of Matter in a Noncommutative UniverseJan 26 2016The dark matter and dark energy problem, that is now dominating the research in cosmology, makes the question of the origin of mass-energy content of the universe more urgent than ever. There are two philosophies regarding this question: according to ... More
Hadronization Corrections to Jet Cross Sections in Deep-Inelastic ScatteringJul 08 1999The size of non-perturbative corrections to high E_T jet production in deep-inelastic scattering is reviewed. Based on predictions from fragmentation models, hadronization corrections for different jet definitions are compared and the model dependence ... More
The Parker instability in disks with differential rotationMar 10 1994We present a detailed study of the growth of the Parker instability in a differentially rotating disk embedded in an azimuthal equilibrium magnetic field, such as the interstellar gas or an accretion disk. Basic properties of the instability without shear ... More
Eclipsing binaries in the Galactic Bulge: candidates for distance estimatesMay 06 2005The 222~000 I-band light curves of variable stars detected by the OGLE-II survey in the direction of the Galactic Bulge have been searched for eclipsing binaries (EBs). A previously developed code to analyze lightcurve shapes and identify long period ... More
AGB stars in the Magellanic CloudsAug 01 1997Some recent results on AGB research in the Magellanic Clouds are reviewed. Discussed are optical and IRAS based surveys, and recent results from the near-infrared DENIS survey, and ISO observations.
Gauge invariant nonlinear electric transport in mesoscopic conductorsApr 04 1996Apr 24 1996We use the scattering approach to investigate the nonlinear current-voltage characteristic of mesoscopic conductors. We discuss the leading nonlinearity by taking into account the self-consistent nonequilibrium potential. We emphasize conservation of ... More
Strangeness Correlation: A Clue to Hadron Modification in Dense Matter?Dec 11 1996We discuss the possibility to observe hadron modification in hot matter via the correlation of identical particles. We find that the hadron modification causes a new type of correlation, back-to-back correlation.
Supersymmetry algebra in N = 1 chiral supergravityMar 25 1996We consider the supersymmetry (SUSY) transformations in the chiral Lagrangian for $N = 1$ supergravity (SUGRA) with the complex tetrad following the method used in the usual $N = 1$ SUGRA, and present the explicit form of the SUSY trasformations in the ... More
Is diffusion anomalous in two-dimensional Yukawa liquids?Sep 01 2009There have recently been many predictions of "superdiffusion" in two-dimensional strongly coupled Yukawa systems, both by computer simulations and in dusty plasma experiments, with substantially varying diffusion exponents. Here we show that the results ... More
Cosmological Moduli Problem and Thermal Inflation ModelsMay 24 1999In superstring theories, there exist various dilaton and modulus fields which masses are expected to be of the order of the gravitino mass $m_{3/2}$. These fields lead to serious cosmological difficulties, so called ``cosmological moduli problem'', because ... More
Ion and polymer dynamics in polymer electrolytes PPO-LiClO4: insights from NMR line-shape analysisApr 27 2006We investigate ion and polymer dynamics in polymer electrolytes PPO-LiClO4 performing 2H and 7Li NMR line-shape analysis. Comparison of temperature dependent 7Li and 2H NMR spectra gives evidence for a coupling of ion and polymer dynamics. 2H NMR spectra ... More
Nuclear DVCS at small-x using the color dipole phenomenologyOct 20 2008Dec 08 2008Using the high energy color dipole formalism, we study the coherent and incoherent nuclear DVCS process in the small-x regime. We consider simple models for the elementary dipole-hadron scattering amplitude that captures main features of the dependence ... More
Hard diffractive quarkonium hadroproduction at high energiesAug 16 2007Dec 21 2007We present a study of heavy quarkonium production in hard diffractive process by the Pomeron exchange for Tevatron and LHC energies. The numerical results are computed using recent experimental determination of the diffractive parton density functions ... More
An estimation of single and double diffractive heavy flavour production in hadron-hadron collidersMay 07 2007Aug 06 2007Results from a phenomenological analysis for diffractive hadroproduction of heavy flavors at high energies are reported. Diffractive production of charm, bottom and top are calculated using Regge factorization, taking into account recent experimental ... More
Wu-Yang Monopoles and Non-Abelian Seiberg-Witten EquationsJun 04 1998Some exact solutions of the SU(2) Seiberg-Witten equations in Minkowski spacetime are given.
Glueball Spectra of SU(2) Gauge Theories in 3 and 4 Dimensions: A Comparison with the Isgur-Paton Flux Tube ModelDec 08 1993We use the results of recent lattice calculations to obtain (part of) the mass spectrum of continuum SU(2) gauge theory in both 2+1 and 3+1 dimensions. We compare these spectra to the predictions of the Isgur-Paton flux tube model for glueballs. We use ... More
The Unique Properties of omega Centauri Seen Through Stroemgren EyesOct 20 1999A revised metallicity calibration of the Stroemgren (b-y),m_1 diagram, based on a sample of globular cluster and field red giant stars, is presented. This new calibration has been used to determine Stroemgren metallicities ([Fe/H]_phot) for more than ... More
Simple mechanism for a positive exchange biasMar 04 1998We argue that the interface coupling, responsible for the positive exchange bias (HE) observed in ferromagnetic/compensated antiferromagnetic (FM/AF) bilayers, favors an antiferromagnetic alignment. At low cooling field this coupling polarizes the AF ... More
The Co-Evolution of Galaxies and Black Holes: Current Status and Future ProspectsSep 05 2008I begin by summarizing the evidence that there is a close relationship between the evolution of galaxies and supermassive black holes. They evidently share a common fuel source, and feedback from the black hole may be needed to suppress over-cooling in ... More
Exactly solved lattice models: from polymer networks to an Ising model in a magnetic fieldJun 09 1998Some recent developments in the study of exactly solved lattice models in statistical mechanics are briefly reviewed. These include work with Debbie Bennett-Wood and Aleks Owczarek on polymers at surfaces (cond-mat/9805148) and with Katherine Seaton on ... More
Thermal rectification effects of multiple semiconductor quantum dot junctionsApr 18 2010Based on the multiple energy level Anderson model, this study theoretically examines the thermoelectric effects of semiconductor quantum dots (QDs) in the nonlinear response regime. The charge and heat currents in the sequential tunneling process are ... More
On the asymptotics of some large Hankel determinants generated by Fisher-Hartwig symbols defined on the real lineNov 04 2004Apr 16 2005We investigate the asymptotics of the determinant of N by N Hankel matrices generated by Fisher-Hartwig symbols defined on the real line, as N becomes large. Such objects are natural analogues of Toeplitz determinants generated by Fisher-Hartwig symbols, ... More
Do we expect light flavor sea-quark asymmetry also for the spin-dependent distribution functions of the nucleon?Aug 20 1999After taking account of the scale dependence by means of the standard DGLAP evolution equation, the theoretical predictions of the chiral quark soliton model for the unpolarized and longitudinally polarized structure functions of the nucleon are compared ... More
Double fermionic contributions to the heavy-quark vacuum polarizationDec 17 2007We compute the virtual O(\alpha_s^3 n_f^2) corrections to the heavy quark vector current correlator in terms of expansions in the external momentum and as an exact numerical solution. As a byproduct, the available high-energy expansion at the three-loop ... More
High-Energy Astrophysics with Neutrino TelescopesJun 15 2009Nov 27 2009Neutrino astrophysics offers new perspectives on the Universe investigation: high energy neutrinos, produced by the most energetic phenomena in our Galaxy and in the Universe, carry complementary (if not exclusive) information about the cosmos with respect ... More
Positive and Negative Charges in Relativistic Schroedinger TheorySep 23 2006Relativistic Schroedinger Theory (RST), as a general gauge theory for the description of relativistic N-particle systems, is shown to be a mathematically consistent and physically reasonable framework for an arbitrary assemblage of positive and negative ... More
Open architecture for multilingual parallel textsAug 28 2008Multilingual parallel texts (abbreviated to parallel texts) are linguistic versions of the same content ("translations"); e.g., the Maastricht Treaty in English and Spanish are parallel texts. This document is about creating an open architecture for the ... More
The Arithmetic of Diophantine Approximation Groups I: Linear TheoryAug 21 2012Mar 11 2016A paradigm for a global algebraic number theory of the reals is formulated with the purpose of providing a unified setting for algebraic and transcendental number theory. This is achieved through the study of subgroups of nonstandard models of Dedekind ... More
Uncertainty propagation within the UNEDF modelsNov 02 2016The parameters of the nuclear energy density have to be adjusted to experimental data. As a result they carry certain uncertainty which then propagates to calculated values of observables. In the present work we quantify the statistical uncertainties ... More
Correlation functions for determinantal processes defined by infinite block Toeplitz minorsJan 30 2019We study the correlation functions for determinantal point processes defined by products of infinite minors of block Toeplitz matrices. The motivation for studying such processes comes from doubly periodically weighted tilings of planar domains, such ... More
The Future of Lepton-Nucleon Scattering, a summary of the Durham workshop, December 2001Apr 24 2002A summary is given of the recent Durham workshop on the future of lepton-nucleon scattering. Discussions at the workshop centred on the need to ensure that an international scientific and technical programme is developed with the goal of further exploring ... More
Probing the Statistics of the Temperature-Density Relation of the IGMDec 10 2003Mar 15 2004Gravitational instability induces a simple correlation between the large and small scale fluctuations of the Ly-alpha flux spectrum. However, non-gravitational processes involved in structure formation and evolution will alter such a correlation. In this ... More
Dimensional effects in Efimov physicsMar 09 2019Efimov physics is drastically affected by the change of spatial dimensions. Efimov states occur in a tridimensional (3D) environment, but disappear in two (2D) and one (1D) dimensions. In this paper, dedicated to the memory of Prof. Faddeev, we will review ... More
Hitting distributions of geometric Brownian motionMar 03 2005Let $\tau$ be the first hitting time of the point 1 by the geometric Brownian motion $X(t)= x \exp(B(t)-2\mu t)$ with drift $\mu \geq 0$ starting from $x>1$. Here $B(t)$ is the Brownian motion starting from 0 with $E^0 B^2(t) = 2t$. We provide an integral ... More
Universality of a double scaling limit near singular edge points in random matrix modelsJul 20 2006We consider unitary random matrix ensembles Z_{n,s,t}^{-1}e^{-n tr V_{s,t}(M)}dM on the space of Hermitian n x n matrices M, where the confining potential V_{s,t} is such that the limiting mean density of eigenvalues (as n\to\infty and s,t\to 0) vanishes ... More
Relative equilibria of Lagrangian systems with symmetryFeb 11 2008We discuss the characterization of relative equilibria of Lagrangian systems with symmetry.
On the Albanese map for smooth quasi-projective varietiesSep 01 2000Let k be an algebraically closed field and X a smooth projective k-variety. A famous theorem of A. A. Roitman states that the canonical map from the degree zero part of the Chow group of zero cycles on X to the group of k-points of its Albanese variety ... More
Characterization of the limit of some higher dymensional thin domain problemsSep 20 2002A reaction-diffusion equation on a family of three dimensional thin domains, collapsing onto a two dimensional subspace, is considered. In \cite{\rfa pr..} it was proved that, as the thickness of the domains tends to zero, the solutions of the equations ... More
Duality between channel capacity and rate distortion with two-sided state informationAug 09 2005We show that the duality between channel capacity and data compression is retained when state information is available to the sender, to the receiver, to both, or to neither. We present a unified theory for eight special cases of channel capacity and ... More
Lepton polarization effects in "Lambda_b -> Lambda l+l-" decay in family non-universal Z' modelFeb 24 2012Possible manifestation of the family non-universal Z' boson effects in lepton polarization in rare, exclusive baryonic "Lambda_b -> Lambda l+l-" decay is examined. It is observed that the double lepton polarizations P_TT and P_NN are sensitive to the ... More
The Strong g_B(**)BPi Coupling Constant in full QCDApr 07 1996To leading order in alpha_s, the leading and non-leading 1/m_b corrections to the excited g_B^(**) meson coupling g_B^(**)BPi is calculated in the framework of QCD spectral moment sum rules in the full theory. Our prediction is in good agreement=20 with ... More
Octet negative parity to octet positive parity electromagnetic transitions in light cone QCDMar 01 2014Light cone QCD sum rules for the electromagnetic transition form factors among positive and negative parity octet baryons are derived. The unwanted contributions of the diagonal transitions among positive parity octet baryons are eliminated by combining ... More
$γ^\ast N \to N(1535)$ transition form factorsAug 14 2013Sep 23 2013The form factors, as well as the helicity amplitudes for the $\gamma^\ast N \to N(1535)$ transition are calculated in framework of the QCD light cone sum rules. The contamination coming from diagonal transition is eliminated by considering combinations ... More
(B -> K_2 l^+ l^-) decay beyond the Standard ModelSep 13 2011Oct 19 2011The exclusive (B -> K_2 l^+ l^-) decay is studied using the most general, model independent four-fermion interaction. The sensitivity of the ratio of the decay widths when K_2 meson is longitudinally and transversally polarized, the forward-backward asymmetry ... More
Unparticle physics effects in (Lambda_b -> Lambda + missing energy) processesOct 08 2007We study unparticle physics effects in (Lambda_b -> Lambda + missing energy) decay with polarized $\Lambda_b$ and $\Lambda$ baryons. The sensitivity of the branching ratio of this decay and polarizations of (Lambda_b) and (Lambda) baryons on the scale ... More
Scalar form factor of the nucleon and nucleon--scalar meson coupling constant in QCDDec 12 2006Jan 15 2007Scalar form factor of the nucleon is calculated in the framework of light cone QCD sum rules, using the most general form of the baryon current. Using the result on scalar form factor of the nucleon, the nucleon-scalar "sigma" and "a_0" meson coupling ... More
Hybridgen: A Model for the Study of QCD Hybrid StatesSep 20 2002We study the mixing of excited states of a Hydrogen atom in a cavity with de-excited states plus a confined photon as a model for the coupling of quark-antiquark and quark-antiquark-gluon hybrid states in QCD. For an interesting range of parameters, the ... More
Relativistic DistanceJul 21 2003In this paper, we prove that two different observers don't equally measure the distance between two points A and B. For this, we introduce some postulates and obtain a new formula to show distance between A and B. In this formula, radius of universe, ... More
Approximately Truthful Multi-Agent Optimization Using Cloud-Enforced Joint Differential PrivacySep 27 2015Nov 08 2016Multi-agent coordination problems often require agents to exchange state information in order to reach some collective goal, such as agreement on a final state value. In some cases, it is feasible that opportunistic agents may deceptively report false ... More
Lambda_b -> Lambda l+ l- decay within family non-universal Z' modelFeb 02 2012We perform a comprehensive analysis of the rare "Lambda_b -> Lambda l+ l-" decay in the framework of family non-universal Z' model. It is shown that Z' gives considerable contribution to the decay width. Zero positions of the forward-backward asymmetry ... More
Polarization effects in exclusive semileptonic (Lambda_b -> Lambda l^+ l^-) decayJul 28 2005Dec 17 2005The independent helicity amplitudes in the (Lambda_b -> \Lambda l^+ l^-) decay in the standard model and its minimal extension, i.e., with the new vector type interactions, are calculated. We calculate various asymmetry parameters characterizing the angular ... More
Electromagnetic form factors of the (rho) meson in light cone QCD sum rulesMay 24 2004We investigate the electromagnetic form factors of the (rho) meson in light cone QCD sum rules. We find that the ratio of the magnetic and charge form factors is larger than two at all values of Q^2, (Q^2 >= 0.5 GeV^2). The values of the individual form ... More
Penguin induced (B -> eta) transition form factor in light cone QCDFeb 20 2003We calculate the penguin form factor for the (B -> eta l^+ l^-) decay. This form factor is calculated in light cone QCD sum rules, including contributions from wave functions up to twist-4, as well as mass corrections of the light (eta) meson.
Lepton polarization and CP-violating effects in "B -> K^* tau^+ tau^-" decay in standard and two Higgs doublet modelsMar 20 2000The most general model independent expressions for the CP-violating asymmetry, longitudinal, transversal and normal polarizations of leptons are derived. Application of these general results to the concrete models such as Standard model and three different ... More
B_c -> l nu gamma decay in light cone QCDApr 26 1998Aug 10 1998The radiative B_c -> l nu gamma decay is investigated in the Standard Model in framework of the light cone QCD. The transition form factors and decay width are calculated. A comparison of light cone QCD and constituent quark model predictions on these ... More
Scattered light models of the dust shell around HD 179821Aug 01 2001The dust shell around the evolved star HD 179821 has been detected in scattered light in near-IR imaging polarimetry observations. Here, we subtract the contribution of the unpolarized stellar light to obtain an intrinsic linear polarization of between ... More
Radiative decays of the heavy tensor mesons in light cone QCD sum rulesSep 27 2018Jan 09 2019The transition form factors of the radiative decays of the heavy tensor mesons to heavy pseudoscalar and heavy vector mesons are calculated in the framework of the light cone QCD sum rules method at the point $Q^2=0$. Using the obtained values of the ... More
On the stability of flow-aware CSMAMar 26 2010We consider a wireless network where each flow (instead of each link) runs its own CSMA (Carrier Sense Multiple Access) algorithm. Specifically, each flow attempts to access the radio channel after some random time and transmits a packet if the channel ... More
Hadronic screening masses and the magnetic gluon condensate at high temperatureAug 02 1994The hadronic screening mass at high temperature ($T$) in QCD$_4$ is examined on the basis of the QCD sum rules in (2+1) dimensions. Due to the magnetic gluon condensate at high $T$ which is expected to be nonvanishing, the screening mass deviates from ... More
Statistical properties of the localization measure in a finite-dimensional model of the quantum kicked rotatorJan 21 2015Mar 26 2015We study the quantum kicked rotator in the classically fully chaotic regime $K=10$ and for various values of the quantum parameter $k$ using Izrailev's $N$-dimensional model for various $N \le 3000$, which in the limit $N \rightarrow \infty$ tends to ... More