total 55086took 0.09s

Band nesting, massive Dirac Fermions and Valley Lande and Zeeman effects in transition metal dichalcogenides: a tight-binding modelMay 08 2017We present here the minimal tight--binding model for a single layer of transition metal dichalcogenides (TMDCs) MX$_{2}$ (M--metal, X--chalcogen) which illuminates the physics and captures band nesting, massive Dirac Fermions and Valley Lande and Zeeman ... More

Demonstration of nonstoquastic Hamiltonian in coupled superconducting flux qubitsMar 14 2019Mar 15 2019Quantum annealing (QA) is a heuristic algorithm for finding low-energy configurations of a system, with applications in optimization, machine learning, and quantum simulation. Up to now, all implementations of QA have been limited to qubits coupled via ... More

Gapless helical superconductivity on the surface of a 3D topological insulatorJun 10 2016Recent angle-resolved photoemission experiments have observed a proximity-induced superconducting gap in the helical surface states of a thin film of the 3D topological insulator Bi$_2$Se$_3$ grown on a superconducting NbSe$_2$ substrate. The superconducting ... More

Gapless helical superconductivity on the surface of a three-dimensional topological insulatorJun 10 2016Dec 20 2016Recent angle-resolved photoemission experiments have observed a proximity-induced superconducting gap in the helical surface states of a thin film of the 3D topological insulator Bi$_2$Se$_3$ grown on a superconducting NbSe$_2$ substrate. The superconducting ... More

Electron-Electron interactions, topological phase and optical properties of a charged artificial benzene ringNov 01 2015We present a theory of the electronic and optical properties of a charged artificial benzene ring (ABR). The ABR is described by the extended Hubbard model solved using exact diagonalization methods in both real and Fourier space as a function of tunneling ... More

Demonstration of nonstoquastic Hamiltonian in coupled superconducting flux qubitsMar 14 2019Quantum annealing (QA) is a heuristic algorithm for finding low-energy configurations of a system, with applications in optimization, machine learning, and quantum simulation. Up to now, all implementations of QA have been limited to qubits coupled via ... More

Time-Resolved Imaging of Negative Differential Resistance on the Atomic ScaleAug 23 2016Aug 25 2016Negative differential resistance remains an attractive but elusive functionality, so far only finding niche applications. Atom scale entities have shown promising properties, but viability of device fabrication requires fuller understanding of electron ... More

Quantum Annealing amid Local Ruggedness and Global FrustrationJan 17 2017Mar 01 2017A recent Google study [Phys. Rev. X, 6:031015 (2016)] compared a D-Wave 2X quantum processing unit (QPU) to two classical Monte Carlo algorithms: simulated annealing (SA) and quantum Monte Carlo (QMC). The study showed the D-Wave 2X to be up to 100 million ... More

Time-Resolved Imaging of Negative Differential Resistance on the Atomic ScaleAug 23 2016Dec 14 2016Negative differential resistance remains an attractive but elusive functionality, so far only finding niche applications. Atom scale entities have shown promising properties, but viability of device fabrication requires fuller understanding of electron ... More

Bridge between Hadrodynamics \& HEP: Regional CP Violation in Beauty \& Charm DecaysAug 23 2016There is a long way from `accuracy' to `precision' about {\bf CP} asymmetries in the decays of beauty \& charm hadrons. (a) We have to apply consistent parametrization of the CKM matrix. (b) Probing many-body final states (FS) is {\em not} a back-up for ... More

Memorial Contribution about Kolya Uraltsev's Talk at 2012 Workshop $B\to D**$Jul 02 2013Jul 14 2013Uraltev has given us a deeper understanding of the forces underlying the data from beauty and charm hadrons for the last 35 years and neutron EDM in the future -- in particular about non-perturbative QCD. At the Workshop in the November 2012 before his ... More

The Sybils' Advice on Charm (and $τ$ Leptons)Apr 05 2006The importance of future studies of charm and $\tau$ decays is emphasized as probes of New Physics: the most powerful tools are \cp asymmetries in charm and $\tau$ decays both in partial widths and final state distributions. While these searches for \cp ... More

The Battle of Albuera, the FC Liverpool and the Standard ModelMar 12 2006The Standard Model despite its well-known short comings is unlikely to yield without offering stubborn resistance. There are compelling arguments that New Physics lurks around the TeV scale. Continuing comprehensive studies of beauty, $\tau$ and charm ... More

Quo Vadis, Fascinum?Aug 14 1995The recent progress in our understanding of heavy-flavour decays allows us to define more reliably which future measurements on charm decays are needed to further advance our understanding of QCD and to get our theoretical tools ready for treating beauty ... More

Beauty Physics in the Next 15 Years -- an Itinerary for a Long Journey towards an Essential GoalJul 06 1994After re-stating why beauty physics is so special and sketching its present status I attempt to map out an itinerary for the next fifteen years. The basic elements are listed for a research program that allows to define and probe the KM unitarity triangle ... More

Weak Decays Of Charm Hadrons: The Next Lesson On QCD -- And Possibly More!Nov 01 1993Second-generation theoretical technologies -- heavy quark expansions, QCD sum rules and QCD simulations on the lattice -- are arriving on the scene, allowing a treatment of charm decays that is genuinely based on QCD. The availability of those theoretical ... More

On the Brink of Major Discoveries in Weak Charm Decays -- a Bismarckian Chance to Make HistoryOct 15 2007The recently obtained strong evidence for $D^0 - \bar D^0$ oscillations from the $B$ factories provides an important benchmark in our search for New Physics in charm transitions. While the theoretical verdict on the observed values of $x_D$ and $y_D$ ... More

The Physics of Beauty (& Charm [& $τ$]) at the LHC and in the Era of the LHCAug 20 2006The recent successes of the SM do not weaken the arguments in favour of New Physics residing at the TeV scale. Finding and identifying it represents the prime challenge for a generation of high energy physicists. To differentiate between different scenarios ... More

Measuring Absolute Branching Ratios of Charmed Baryons in $B$ DecaysNov 14 2001The $B$ factories are expected to provide huge samples of single $B$ decay events with little background by reconstructing one of the $B$ mesons produced in $\Upsilon (4S)$ decays. This represents a new experimental paradigm: such samples will allow to ... More

Heavy Flavour Physics: On Its More Than 50 Years Of History, Its Future And The Rio ManifestoDec 13 2000Dec 23 2000After a reminder about how $\Delta S\neq 0$ physics has been instrumental for the development of the Standard Model I sketch theoretical technologies for dealing with nonperturbative QCD in heavy flavour decays and state predictions for CP odd effects ... More

The Lifetimes of Heavy Flavour Hadrons - a Case Study in Quark-Hadron DualityJan 01 2000The status of heavy quark expansions for charm and beauty lifetime ratios is reviewed. Taking note of the surprising semiquantitative success of this description for charm hadrons I interprete the new data on $\tau (D_s)$ and re-iterate the call for more ... More

Memo on Extracting |V(cb)| and |V(ub)/V(cb)| from semileptonic B decaysJul 07 1999Heavy Quark Expansions for semileptonic decays of beauty hadrons are briefly reviewed. I analyze how $|V(cb)|$ can be extracted from the semileptonic width of $B$ mesons, the average semileptonic width of all weakly decaying beauty hadrons and from $B ... More

Inclusive $B_c$ Decays As A QCD LabOct 17 1995Phenomenological models of heavy flavour decays differ significantly in their predictions of global features of $B_c$ decays, like the $B_c$ lifetime or the relative weight of $c\ra s$ and $b\ra c$ transitions. The $1/m_Q$ expansion which is directly ... More

Lifetimes of Heavy-Flavour Hadrons -- Whence and Whither?Jul 21 1995Jul 27 1995A theoretical treatment for the weak decays of heavy-flavour hadrons has been developed that is genuinely based on QCD. Its methodology as it applies to total lifetimes and the underlying theoretical issues are sketched. Predictions are compared with ... More

Spectrum of Anisotropic Exponents in Hydrodynamic Systems with PressureNov 14 2000Mar 15 2001We discuss the scaling exponents characterizing the power-law behavior of the anisotropic components of correlation functions in turbulent systems with pressure. The anisotropic components are conveniently labeled by the angular momentum index $\ell$ ... More

Ultra High Energy Cosmic Rays and InflationJan 27 1999Two processes of matter creation after inflation: 1) gravitational creation of superheavy (quasi)stable particles, and 2) non-thermal phase transitions leading to formation of topological defects, may be relevant to the resolution of the puzzle of cosmic ... More

Bridge between Hadrodynamics & HEP: Regional CP Violation in Beauty & Charm DecaysAug 23 2016Oct 03 2016There is a long way from `accuracy' to `precision' about {\bf CP} asymmetries in the decays of beauty \& charm hadrons. (a) We have to apply consistent parametrization of the CKM matrix. (b) Probing many-body final states (FS) is {\em not} a back-up for ... More

Intercalant-Driven Superconductivity in YbC$_{6}$ and CaC$_{6}$Apr 06 2005Recently deiscovered superconductivity in YbC$_6$ and CaC$_6$ at temperatures substantially higher than previously known for intercalated graphites, raised several new questions: (1) Is the mechanism considerably different from the previously known intercalated ... More

Vitaly Ginzburg and High Temperature Superconductivity: Personal ReminiscencesAug 14 2007Aug 17 2007I offer some personal reminiscences from the period of 1976-1983, when I was a M. Sc. and then a Ph.D. student in Vitaly L. Ginzburg's High Temperature Superconductivity group at the P.N. Lebedev Institute in Moscow

Isentropic perturbations of a chaotic domainJan 23 2014Three major properties of the chaotic dynamics of the standard map, namely, the measure \mu of the main connected chaotic domain, the maximum Lyapunov exponent L of the motion in this domain, and the dynamical entropy h = \mu L are studied as functions ... More

On the stability of the triangular libration points: exact resultsAug 30 2007Oct 10 2007This paper has been withdrawn by the author, due to necessity of revision.

Coding for Parallel Channels: Gallager Bounds for Binary Linear Codes with Applications to Repeat-Accumulate Codes and VariationsJul 02 2006This paper is focused on the performance analysis of binary linear block codes (or ensembles) whose transmission takes place over independent and memoryless parallel channels. New upper bounds on the maximum-likelihood (ML) decoding error probability ... More

RXTE observations of Seyfert-2 galaxies: evidence for spectral variabilityAug 18 2000We present a series of RXTE observations of the nearby obscured Seyfert galaxies ESO103-G35, IC5063, NGC4507 and NGC7172. The period of monitoring ranges from seven days for NGC7172 up to about seven months for ESO103-G035. The spectra of all galaxies ... More

CP Asymmetries in Many-Body Final States in Beauty & Charm TransitionsSep 13 2015Dec 06 2015Our community has focused on two-body final states in $B$ & $D$ decays. The SM produces at least the leading source of CP violation in $B$ transitions, none has been established yet in charm decays. It is crucial to measure three- and four-body FS with ... More

Hadronization -- the Unsung Hero rather than the Alleged Villain in the Tale of CP ViolationSep 14 2005The novel successes scored by the Standard Model of High Energy Physics in the last few years concerning heavy flavour dynamics do not weaken the case for `New Physics' around the TeV scale. They do suggest however that one cannot {\em count} on that ... More

`Per Aspera Ad Astra' -- A Short Essay on the Long Quest for CP ViolationNov 10 2004After briefly explaining the special role played by violations of CP and T invariance and their connection with the baryon number of the Universe, I sketch the history of CP violation studies since its totally unexpected discovery in 1964. For about 30 ... More

3- and 4-Body Final States in B, D and tau Decays about Features of New Dynamics with CPT Invariance or "Achaeans outside Troy"Jun 25 2013Aug 08 2013The 'landscape' of fundamental dynamics has changed even for the 'known' matter. The Standard Model has produced at least the leading source of CP violation (CPV) in B decays; the data have not shown CP asymmetries in $D$ transitions. It needs more data ... More

CP Violation in $τ$ Decays at SuperB \& Super-Belle Experiments -- like Finding Signs of Dark MatterOct 10 2012BaBar has found $A_{\rm CP}(\tau^- \to \nu K_S\pi^- [\geq \pi^0]) = (-0.36 \pm 0.23 \pm 0.11)%$ with 2.8 $\sigma$ difference with SM prediction $A_{\rm CP}(\tau^- \to \nu K_S\pi^-) = (0.36 \pm 0.01)%$ based on $K^0 - \bar K^0$ oscillation. Four central ... More

"I Know She Invented Fire, But What Has She Done Recently?" -- On The Future Of Charm PhysicsAug 07 2006Detailed studies of weak charm decays fill an important {\em future} role in high energy physics. Chief among them are: (i) validating the theoretical control achieved over hadronization as a worthwhile goal in its own right; (ii) calibrating our tools ... More

Flavour Dynamics & CP Violation in the SM*: A Tale in Five Parts of Great Successes, Little Understanding -- and Promise for the Future!Jan 20 2006Our knowledge of flavour dynamics has undergone a `quantum jump' since just before the turn of the millenium: direct \cp violation has been firmly {\em established} in $K_L \to \pi \pi$ decays in 1999; the first \cp asymmetry outside $K_L$ decays has ... More

InflationDec 10 2001Inflationary cosmology is reviewed. Particular attention is given to processes of creation.

A study of the effects of preheatingJan 24 1997We review results of a numerical study of resonant inflaton decay in a wide range of realistic models and parameters. Wide enough parametric resonance can withstand the expansion of the Universe, though account for the expansion is very important for ... More

Mossbauer Spectroscopy Determination of iron foreign phases in the Superconducting Systems; RAsFeO1-x, RAsFeO1-xFx and Sr1-xKxFe2As2Jun 25 2008The recently discovered superconducting - spin density wave materials, containing Fe and As, have raised huge interest. However most materials prepared to date, suffer from a varying degree of content of foreign Fe-As phases, Fe2As, FeAs2 and FeAs, which ... More

CaMn$_{2}$Sb$_{2}:$ a fully frustrated classical magnetic systemSep 15 2013We show by means of density functional calculations that CaMn$_{2}$Sb$_{2}$ is very close to a mean-field critical point known for the classical Heisenberg model on the honeycomb lattice. Three entirely different long range ordered magnetic phases become ... More

Correspondence on "Electronic correlations in the iron pnictides"Oct 21 2009I point out that the observed discrepancy between the measured and calculated Drude weights in LaFePO may be caused not only by mass renormalization, but also by a DFT inaccuracy in determining the relative positions of the hole and electron band.

How to calculate the degree of spin polarization in ferromagnets?Dec 19 1998Jun 10 1999Different ways to define and to calculate the degree of spin polarization in a ferromagnet are discussed, particularly with respect to spin-polarized tunneling and Andreev reflection at the boundary between a superconductor and ferromagnet. As an example, ... More

Structural and Electronic Properties of the 2D Superconductor CuS with 1 1/3-valent CopperNov 03 2011Jan 13 2012We present first principle calculations of the structural and electronic properties of the CuS covellite material. Symmetry-lowering structural transition is well reproduced. However, the microscopic origin of the transition is unclear. The calculations ... More

CeMnNi4: an impostor half-metalOct 14 2005Recent experiments show CeMnNi$_{4}$ to have a nearly integer magnetic moment and a relatively large transport spin polarization, as probed by Andreev reflection, suggesting that the material is a half metal or close to it. However, the calculations reported ... More

Testing the wavelength dependence of cosmological redshift down to $Δz \sim 10^{-6}$May 30 2016At the core of the standard cosmological model lies the assumption that the redshift of distant galaxies is independent of photon wavelength. This invariance of cosmological redshift with wavelength is routinely found in all galaxy spectra with a precision ... More

Lyapunov exponents in resonance multipletsDec 19 2013The problem of estimating the maximum Lyapunov exponents of the motion in a multiplet of interacting nonlinear resonances is considered for the case when the resonances have comparable strength. The corresponding theoretical approaches are considered ... More

The dynamical temperature and the standard mapDec 19 2013Numerical experiments with the standard map at high values of the stochasticity parameter reveal the existence of simple analytical relations connecting the volume and the dynamical temperature of the chaotic component of the phase space.

Rectangles in latin squaresFeb 13 2019To get another from a given latin square, we have to change at least 4 entries. We show how to find these entries and how to change them.

Probing CP Violation in $τ^- \to ν(Kπ/K2π/ 3K/ K3π)^- $ DecaysApr 26 2012Jun 19 2012It had been suggested to probe CP violation in {\tau} \rightarrow {\nu}K{\pi} decays with K0 -K ^{-}0 oscillation to produce ACP({\tau}- \rightarrow {\nu}KS{\pi}-) = (0.36\pm0.01)%. BaBar has found ACP({\tau}- \rightarrow {\nu}KS{\pi}-[\geq {\pi}0]) = ... More

Could Charm's "Third Time" Be the Real Charm? -- A ManifestoFeb 18 2009The recent observation of $D^0 - \bar D^0$ oscillations has left us in a quandary concerning the theoretical interpretation: are they driven by SM forces alone or do they involve new dynamics? A comprehensive analysis of \cp symmetry in $D$ decays can ... More

I Have Come to Praise Charm, not Bury itDec 03 2004The case for further dedicated studies of charm dynamics is presented as driven by three complementary motivations: core lessons on QCD and nonperturbative dynamics in general can be learnt; those can be applied with great profit in analyses of B decays; ... More

CP, T and CPT Symmetries at the Turn of a New MilleniumNov 19 2000After summarizing the status concerning CP violation in 1998 I describe the exciting developments of the last two years and extrapolate to the future. I comment on recent lessons about T and CPT invariance maninly from CPLEAR and emphasize the potential ... More

Flavour Dynamics - Central Mysteries of the Standard ModelSep 04 2000Sep 16 2000After pointing out the amazing success of the CKM description in accommodating the phenomenology of flavour changing neutral currents I review the status of theoretical technologies for extracting CKM parameters from data. I sketch novel directions, namely ... More

Dear Santa: Heavy Flavour Physics at Neutrino Factories - Desires from TheoryJun 21 2000Even in 2010 the CKM parameters $V_{cs}$, $V_{cd}$ and $V_{ub}$ will be known with less than desirable accuracy; the discovery potential for New Physics in charm decays -- in particular their CP asymmetries -- will be far from exhausted; important tests ... More

Marching towards a Theory of Non-leptonic Decays of heavy-Flavour Hadrons"Nov 03 1993Theoretical descriptions for the nonleptonic decays of heavy flavour hadrons have emerged that incorporate non-perturbative corrections in a systematic way and are genuinely based on QCD. One can reproduce $\tau (D^+)/\tau (D^0)$, $BR_{SL}(D^+)$ and $BR_{SL}(D^0)$ ... More

Working with Kolya Uraltsev for twenty-five years about Fundamental Dynamics & Symmetries and for the future -- like CP Violation & EDMsOct 28 2013Feb 25 2015Working with Kolya Uraltsev was a real `marvel' for me about CP & T violation, QCD & its impact on transitions in heavy flavor hadrons, EDMs. The goal was -- and still is -- to define fundamental parameters dynamics, how to measure them and compare SM ... More

"Ceterum censeo Fabricam Super Saporis esse faciendam" ("Moreover I advise a Super-Flavour Factory has to be built")Apr 28 2008The discovery of $B_d - \bar B_d$ oscillations twenty years ago by the ARGUS collaboration marked a watershed event. It persuaded a significant part of the HEP community that the large time dependent \cp asymmetries predicted for some $B_d$ decays might ... More

A Send-off after Dif06: What Do We Need to Know to Understand More?Mar 29 2006After a brief look back at the roles played by hadronic machines and $e^+e^-$ colliders I emphasize that continuing dedicated studies of heavy flavour transitions should be central to our efforts of decoding nature's `Grand Design'. For studies `instrumentalizing' ... More

Astroparticle PhysicsMay 18 2004In this astro-particle lecture course I shall try to emphasize evidence of the new physics which we have in cosmological and astrophysical data. This includes support of the inflationary model, necessity of dark energy and of non-baryonic dark matter, ... More

Phase Transitions at PreheatingOct 19 1995Feb 07 1996Symmetry restoration processes during the non-equilibrium stage of ``preheating'' after inflation is studied. It is shown that symmetry restoration is very efficient when the majority of created particles are concentrated at energies much smaller than ... More

Suppression and restoration of superconductivity in PrBa2Cu3O7Mar 03 1999Mar 11 1999I review the principal experimental findings about superconductivity, suppression thereof, and related properties of RE_{1-x}Pr_xBa_2Cu3O7 in a decision-tree manner, eliminating the models substantially incompatible with established experimental facts, ... More

On the possibility of superconductivity in PrBa2Cu3O7Jun 19 1998Recent reports about observations of superconductivity in PrBa2Cu3O7 raise a number of questions: (i) of various theories striving to explain the Tc suppression in PrxY{1-x}Ba2Cu3O7, are there any compatible with possible superconductivity in stoichiometric ... More

Symmetry analysis of possible superconducting states in KxFe2Se2 superconductorsFeb 17 2011A newly discovered family of the Fe-based superconductors is isostructural with the so-called 122 family of Fe pnictides, but has a qualitatively different doping state. Early experiments indicate that superconductivity is nodeless, yet prerequisites ... More

Sr$_{2}$VO$_{3}$FeAs as Compared to Other Fe-based SuperconductorsSep 28 2009Apr 20 2010One of the most popular scenarios for the superconductivity in Fe-based superconductors (FeBSC) posits that the bosons responsible for electronic pairing are spin-fluctuations with a wave vector spanning the hole Fermi surfaces (FSs) near $\Gamma$ and ... More

Role of defects on the electronic and magnetic properties of CrAs/InAs and CrAs/CdSe half-metallic interfacesDec 09 2009We present an extended study of single impurity atoms at the interface between the half-metallic ferromagnetic zinc-blende CrAs compound and the zinc-blende binary InAs and CdSe semiconductors in the form of very thin multilayers. Contrary to the case ... More

Symbolic computation of the Birkhoff normal form in the problem of stability of the triangular libration pointsDec 26 2013The problem of stability of the triangular libration points in the planar circular restricted three-body problem is considered. A software package, intended for normalization of autonomous Hamiltonian systems by means of computer algebra, is designed ... More

CP Asymmetries (\& T Violation) in Known Matter -- and beyondNov 03 2014Aug 18 2016Finding \cp~violation (\CPV ) in 1964 produced a real revolution in the fundamental dynamics, although the community did not understand it right away. The paper by Kobayashi \& Maskawa \cite{KM} appeared in 1973 to describe \CPV~in classes of three (or ... More

No Pain, No Gain -- On the Challenges and Promises of Charm StudiesJul 17 2009The observation of $D^0 - \bar D^0$ oscillations has left us in a tantalizing quandary concerning the theoretical interpretation: are they still compatible with the SM or might they require new dynamics (NP)? A comprehensive search for CP violation in ... More

Flavour Dynamics & \cp Violation in the Standard Model: A Crucial Past -- and an Essential FutureJan 31 2007Our knowledge of flavour dynamics has undergone a `quantum jump' since just before the turn of the millenium: direct \cp violation has been firmly {\em established} in $K_L \to \pi \pi$ decays in 1999; the first \cp asymmetry outside $K_L$ decays has ... More

Studying CP Violation -- Chances for a New AllianceJun 26 2002The last three years have seen a phase transition in our knowledge about CP violation: (i) Direct CP violation has been established in $K_L \to \pi \pi$. (ii) The first CP violation outside $K_L$ decays has been observed in $B_d \to \psi K_S$: $<{\rm ... More

The Vietri CodicesJun 23 2002Aug 08 2002Studying heavy flavour physics is driven by multiple motivations: to probe our theoretical control over QCD; enhance our information on gluon and sea quark structure functions; use heavy flavour production as signal for the onset of the quark-gluon plasma; ... More

Charm Physics and the Poor Sleeper's ImpatienceApr 02 2001After a short review of the theoretical tools available to describe heavy flavour physics I sketch the present profile of the weak dynamics of charm hadrons with respect to lifetimes, oscillations and CP violation. I argue that comprehensive studies of ... More

The QCD Perspective on Lifetimes of Heavy-Flavour HadronsAug 31 1995Over the last few years a theoretical treatment for the weak decays of heavy-flavour hadrons has been developed that is genuinely based on QCD. Its methodology is described as it applies to total lifetimes, and the underlying theoretical issues are discussed. ... More

Looking from the East at an Elephant Trotting West: Direct CP Violation in $B^0$ DecaysMar 17 2002Mar 24 2002With the time dependant CP asymmetry in $B_d(t) \to \psi K_S$ well measured, the most powerful method to search for {\em direct} CP violation in $B_d$ decays is to analyze whether the CP asymmetry of other transitions like $B_d(t) \to \pi ^+ \pi ^-, \eta ... More

On A Recent Claim Concerning $τ(D_s)/τ(D^0)$Dec 11 2001Feb 06 2002It has been suggested that the observed $D_s - D^0$ lifetime difference can be `understood' as due to $SU(3)_{Fl}$ breaking in the phase spaces for the exclusive $D^0$ and $D_s$ channels `removing' the need for weak annihilation. It is pointed out that ... More

Charm Physics - Like Botticelli in the Sistine ChapelJul 09 2001After sketching heavy quark expansions as applied to heavy flavour decays I emphasize the relevance of nonperturbative dynamics at the charm scale for exclusive $b\to c$ modes. I address the issue of quark-hadron duality for charm and discuss both the ... More

The Expected, The Promised and The Conceivable -- On CP Violation in Beauty and Charm DecaysDec 05 1994the KM expectations of large CP asymmetries in $B$ decays are reviewed. I describe some observable signatures for the intervention of New Physics and list benchmarks defining the `ultimate' measurements in beauty physics. I also stress the need for dedicated ... More

An efficient and flexible Abel-inversion method for noisy dataAug 25 2016We propose an efficient and flexible method for solving Abel integral equation of the first kind, frequently appearing in many fields of astrophysics, physics, chemistry, and applied sciences. This equation represents an ill-posed problem, thus solving ... More

Superconductivity and Magnetism in BiOCuSJan 13 2010Apr 20 2010BiOCu_{1-y}S was recently reported to superconduct at T=5.8 K at y~0.15. Band structure calculations indicate that stoichiometric BiOCuS is a band insulator. In this paper, I show that hole-doped (whether in the virtual crystal approximation or with actual ... More

Absence of magnetic ordering in NiGa_2S_4Aug 09 2007Triangular-layered NiGa2S4, contrary to intuitive expectation, does not form a noncollinear antiferromagnetic structure, as do isoelectronic NaCrO2 and LiCrO2. Instead, the local magnetic moments remain disordered down to the lowest measured temperature. ... More

Electronic structure and magnetism in the frustrated antiferromagnet LiCrO2Jan 22 2007LiCrO2 is a 2D triangular antiferromagnet, isostructural with the common battery material LiCoO2 and a well-known Jahn-Teller antiferromagnet NaNiO2. As opposed to the latter, LiCrO2 exibits antiferromagnetic exchange in Cr planes, which has been ascribed ... More

Tunneling of Bloch electrons through vacuum barrierDec 04 2000Tunneling of Bloch electrons through a vacuum barrier introduces new physical effects in comparison with the textbook case of free (plane wave) electrons. For the latter, the exponential decay rate in the vacuum is minimal for electrons with the parallel ... More

A "Known" CP Asymmetry in $τ$ DecaysJun 04 2005Jul 27 2005We point out that dynamics known from the observed CP violation in $K_L\to \pi^{\mp}l^{\pm}\nu$ generate a CP asymmetry of $3.3\cdot 10^{-3}$ in $\tau^{\pm} \to \nu K_L\pi^{\pm}$. CPT invariance requires the same asymmetry in the more approachable transitions ... More

Comments on the Sign of CP AsymmetriesNov 27 1998Jan 18 1999Several experiments are about to measure the CP asymmetry for $B \to \psi K_S$ and other decays. The standard model together with the Kobayashi-Maskawa ansatz for CP violation predicts the sign as well as the magnitude for this asymmetry. In this note ... More

Resonances, and mechanisms of Theta-productionJun 28 2004After explaining necessity of exotic hadrons, we discuss mechanisms which could determine production of the exotic Theta-baryon. A possible important role of resonances (producing the Theta in real or virtual decays) is emphasized for various processes. ... More

On the Sign of $ΔM_B$, $M_{12}$, sin$2φ_1$ and all thatNov 09 2004Dec 21 2004We are withdrawing our paper hep-ph/0411135 since its main conclusion is wrong as we have learnt with the assistance of Bob Cahn and Jerome Charles. The sign of $\Delta M_B$ does not matter in interpreting the CP asymmetry in $B_d \to \psi K_S$, as we ... More

Ionization-induced laser-driven QED cascade in noble gasesJul 31 2017A formula for the ionization rate in extremely intense electromagnetic field is proposed and used for numerical study of QED (quantum-electrodynamical) cascades in noble gases in the field of two counter-propagating laser pulses. It is shown that the ... More

Model of Trace Gas Flux in Boundary LayerMar 04 2013Mathematical model of the turbulent flux in the three-layer boundary system is presented. Turbulence is described as a presence of the nonzero vorticity. Generalized advection-diffusion-reaction equation is derived for arbitrary number components in the ... More

Is Super-$B$ Sufficiently Superb? -- On the Motivation for a Super-$B$ FactoryJan 01 2004Despite the great success of the $\Upsilon (4S)$ $B$ factories at KEK and SLAC and the guaranteed addition of high sensitivity measurements on beauty decays to be performed at the Tevatron and LHC, a strong case can be made for an $e^+e^-$ Super-$B$ factory ... More

Where are holes in Y_{1-x}Pr_xBa2Cu3O7 ?Jun 25 1997Recent experiments by Mertz et al (Phys. Rev. B55, 9160, 1997) demonstrated that the loss of superconductivity upon Pr doping is associated with the change of the character of the oxygen holes from $p_{\sigma}$ to $p_{\pi}.$ This experiment sheds new ... More

Insulating gap in FeO: correlations and covalencyOct 18 1996We report calculations of the electronic structure of FeO in the LDA and LDA+U approximation with and without rhombohedral distortion. In both cases LDA renders an antiferromagnetic metal, and LDA+U opens a Hubbard gap. However, the character of the gap ... More

Two-Photon Processes and Photon StructureMay 27 2002In this article aspects of photon-photon physics related to the structure of real and virtual photons are reviewed. A re-calculation of the virtual photon-photon box is performed and some discrepancies in the literature are clarified. A useful compilation ... More

Leading log radiative corrections to polarized heavy flavour leptoproductionNov 28 1997Apr 22 1998O(\alpha) QED radiative corrections to polarized neutral current leptoproduction of heavy quark flavours are calculated in the leading log approximation for HERMES, COMPASS, and HERA kinematics. Besides the inclusive case, we derive general $z_h$-differential ... More

Zero-mass limit of a Dirac spinor with general spin orientationJun 09 2016Aug 23 2016The helicity eigenstates which describe the fermions with a special spin orientation (parallel or antiparallel to the direction of momentum) provide considerable simplification in calculations. Hence, it is generally preferred to use helicity basis during ... More

Cancellation of pinching singularities in out-of-equilibrium thermal field theorySep 15 1998Oct 09 1998Long standing problem in out-of-equilibrium thermal field theories are pinching singularities. We find that the expressions suspect of pinching require loop particles to be on the mass shell. This fact, with the help of threshold effect and similar effect ... More

On the Bergmann Energy-Momentum Complex of a Charged Regular Black HoleApr 02 2001We use the Bergmann energy-momentum complex to calculate the energy of a charged regular black hole. The energy distribution is the same as we obtained in the Einstein prescription. Also, we get the expression of the energy in the Bergmann prescription ... More