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Planar embeddings of chainable continuaJun 13 2018We prove that for a chainable continuum $X$ and every non-zigzag $x\in X$ there exists a planar embedding $\phi:X\to \phi(X)\subset\mathbb R^2$ such that $\phi(x)$ is accessible, partially answering the question of Nadler and Quinn from 1972. Two embeddings ... More

Folding points of unimodal inverse limit spacesFeb 01 2019We study the properties of folding points and endpoints of unimodal inverse limit spaces. We distinguish between non-end folding points and three types of end-points (flat, spiral and nasty) and give conditions for their existence and prevalence. Additionally, ... More

Prime Ends Dynamics in Parametrised Families of Rotational AttractorsJun 11 2019We provide several new examples in dynamics on the $2$-sphere, with the emphasis on better understanding the induced boundary dynamics of invariant domains in parametrized families. First, motivated by a topological version of the Poincar\'e-Bendixson ... More

Antiparallel d-stable Traces and a Stronger Version of Ore ProblemMar 23 2014Aug 22 2016In $2013$ a novel self-assembly strategy for polypeptide nanostructure design which could lead to significant developments in biotechnology was presented in [Design of a single-chain polypeptide tetrahedron assembled from coiled-coil segments, Nature ... More

Parallelism of stable tracesDec 27 2016A $d$-stable trace is a closed walk which traverses every edge of a graph exactly twice and for every vertex $v$, there is no subset $N \subseteq N(v)$ ($1 \leq |N| \leq d$), such that every time the walk enters $v$ from $N$, it also exits to a vertex ... More

Parallelism of stable tracesDec 27 2016Aug 08 2019A parallel $d$-stable trace is a closed walk which traverses every edge of a graph exactly twice in the same direction and for every vertex $v$, there is no subset $X \subseteq N(v)$ with $1 \leq |N| \leq d$ such that every time the walk enters $v$ from ... More

Sharp upper and lower bounds on the number of spanning trees in Cartesian product of graphsOct 23 2012Let $G_1$ and $G_2$ be simple graphs and let $n_1 = |V(G_1)|$, $m_1 = |E(G_1)|$, $n_2 = |V(G_2)|$ and $m_2 = |E(G_2)|.$ In this paper we derive sharp upper and lower bounds for the number of spanning trees $\tau$ in the Cartesian product $G_1 \square ... More

A short note on a short remark of Graham and LovászMar 19 2013Sep 30 2013Let D be the distance matrix of a connected graph G and let nn(G), np(G) be the number of strictly negative and positive eigenvalues of D respectively. It was remarked in [1] that it is not known whether there is a graph for which np(G) > nn (G). In this ... More

Antiparallel d-stable Traces and a Stronger Version of Ore ProblemMar 23 2014Oct 21 2016In $2013$ a novel self-assembly strategy for polypeptide nanostructure design which could lead to significant developments in biotechnology was presented in [Design of a single-chain polypeptide tetrahedron assembled from coiled-coil segments, Nature ... More

Tutte polynomials and a stronger version of the Akiyama-Harary problemJun 04 2013Nov 03 2013Can a non self-complementary graph have the same chromatic polynomial as its complement? The answer to this question of Akiyama and Harrary is positive and was given by J. Xu and Z. Liu. They conjectured that every such graph has the same degree sequence ... More

Counting graphs with different numbers of spanning trees through the counting of prime partitionsOct 21 2012Oct 23 2012Let A_n (n >= 1) be the set of all integers x such that there exists a connected graph on n vertices with precisely x spanning trees. In this paper, we show that |A_n| grows faster than sqrt{n}exp(2Pi*sqrt{n/log{n}/Sqrt(3)} This settles a question of ... More

Theory of b --> s/d nu anti-nuDec 23 2010Mar 17 2011The b --> s nu anti-nu transitions are sensitive probes of new physics (NP) in the form of non-standard Z penguin effects. They involve four experimentally accessible observables, among which the inclusive rate of B --> Xs nu anti-nu is the most theoretically ... More

Role of Resonances in Heavy Meson Processes within Standard Model and BeyondSep 21 2007Nov 06 2007The effective theory based on combined chiral and heavy quark symmetry, the heavy meson chiral perturbation theory, is applied to studying the role of resonances in various processes of heavy mesons within and beyond the Standard Model. Chiral corrections ... More

There is no (75,32,10,16) strongly regular graphSep 19 2015Mar 08 2016We show that there is no (75,32,10,16) strongly regular graph. The result is obtained by a mix of algebraic and computational approaches. The main idea is to build large enough induced structure and apply the star complement technique. Our result implies ... More

Delta F = 1 Constraints on Minimal Flavor ViolationMay 15 2008We present an updated phenomenological analysis of the minimal flavor violating (MFV) effective theory, both at small and large tan beta, in the sector of Delta F=1 processes. We evaluate the bounds on the scale of new physics derived from recent measurements ... More

There is no (75,32,10,16) strongly regular graphSep 19 2015Sep 20 2017We show that there is no (75,32,10,16) strongly regular graph. The result is obtained by a mix of algebraic and computational approaches. The main idea is to build large enough induced structure and apply the star complement technique. Our result implies ... More

Euler's idoneal numbers and an inequality concerning minimal graphs with a prescribed number of spanning treesOct 23 2012Feb 11 2013Let $\alpha(n)$ be the least number $k$ for which there exists a simple graph with $k$ vertices having precisely $n \geq 3$ spanning trees. Similarly, define $\beta(n)$ as the least number $k$ for which there exists a simple graph with $k$ edges having ... More

Theory of Semileptonic Charm DecaysSep 15 2009A brief review of the theoretical description of exclusive and inclusive semileptonic charm decays is given. In light of the recent experimental puzzles in leptonic charm decays, the complementary role of semileptonic modes is emphasized. The relevance ... More

Kondo effect in oscillating moleculesMay 14 2009We consider electronic transport through break-junctions bridged by a single molecule in the Kondo regime. We describe the system by a two-channel Anderson model. We take the tunneling matrix elements to depend on the position of the molecule. It is shown, ... More

Increasing the throughput of machine translation systems using cloudsNov 09 2016The manuscript presents an experiment at implementation of a Machine Translation system in a MapReduce model. The empirical evaluation was done using fully implemented translation systems embedded into the MapReduce programming model. Two machine translation ... More

Strongly pseudoconvex handlebodiesMay 16 2003We give an explicit construction of special strongly pseudoconvex domains in C^n of handlebody type, i.e., domains which are small tubes surrounding the union of a quadratic strongly pseudoconvex domain with an attached totally real handle. Among other ... More

Delving into adversarial attacks on deep policiesMay 18 2017Adversarial examples have been shown to exist for a variety of deep learning architectures. Deep reinforcement learning has shown promising results on training agent policies directly on raw inputs such as image pixels. In this paper we present a novel ... More

There is no (95,40,12,20) strongly regular graphMar 07 2016Mar 08 2016We show that there is no $(95,40,12,20)$ strongly regular graph and, consequently, there is no $(96,45,24,18)$ strongly regular graph, no two-graph on $96$ vertices, and no partial geometry $\rm{pg}(5,9,3)$. The main idea of the result is based on the ... More

Moore graphs and cycles are extremal graphs for convex cyclesOct 23 2012Let $\rho(G)$ denote the number of convex cycles of a simple graph G of order n, size m, and girth 3 <= g <=n. It is proved that $\rho(G) \leq \frac{n}{g}(m-n+1)$ and that equality holds if and only if G is an even cycle or a Moore graph. The equality ... More

Chiral loop corrections to strong decays of positive and negative parity charmed mesonsJun 27 2006Nov 03 2006We consider chiral loop corrections to the effective couplings which describe the strong interactions of two heavy mesons of even or odd parities and a light pseudoscalar meson, within a framework which combines heavy quark effective theory and chiral ... More

Thermopower and Entropy: lessons from Sr$_2$RuO$_4$Apr 15 2015We calculate the in-plane Seebeck coefficient of Sr$_2$RuO$_4$ within a framework combining electronic structure and dynamical mean-field theory. We show that its temperature-dependence is consistent with entropic considerations embodied in the Kelvin ... More

Accessible points of planar embeddings of tent inverse limit spacesOct 31 2017Feb 01 2019In this paper we study a class of embeddings of tent inverse limit spaces. We introduce techniques relying on the Milnor-Thurston kneading theory and use them to study sets of accessible points and prime ends of given embeddings. We completely characterize ... More

Direct CP violation in non-leptonic charm decays: Implications for new physicsFeb 15 2013I review the implications of recent measurements of CP violation in D meson decays in the context of standard model extensions. Using effective theory methods, one can derive significant constraints on the possible non-standard contributions from measurements ... More

Note on helicity amplitudes in D to V semileptonic decaysJan 04 2006Motivated by the recent extraction of the helicity amplitudes for the D+ -> K*0bar mu+ nu decay, done by the FOCUS collaboration, we determine helicity amplitudes for the D+ -> K*0bar l nu, D+ -> rho0 l nu and Ds -> phi l nu semileptonic decays using ... More

Charm meson resonances in D semileptonic decaysSep 16 2005Motivated by recent experimental results we reconsider semileptonic D to P l nu_l and D to V l nu_l decays within a model which combines heavy quark symmetry and properties of the chiral Lagrangian. Using limits of soft collinear effective theory and ... More

Top, Polarization, LHC and New PhysicsMay 19 2011Polarization observables in top quark decays are sensitive probes of possible new physics contributions to the interactions of the heavy third generation quarks. Within an effective theory approach such new physics contributions can be classified in terms ... More

Charm meson resonances and D to V semileptonic form factorsJun 06 2005Aug 25 2005Using limits of large energy effective theory and heavy quark effective theory we propose a simple parametrization of the heavy to light H to V semileptonic form factors. Then we reconsider D to V l nu_l decays within a model which combines heavy meson ... More

On the flavor structure of the littlest Higgs modelOct 23 2007We investigate the Yukawa sector for up-like quarks in the Lee's version of the Littlest Higgs model. We derive general quark mass and mixing formulae and study leading order contributions due to non-zero light quark masses. Relying on the unitarity of ... More

B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron CollidersFeb 26 2008In the Standard Model, scalar contributions to leptonic and semileptonic decays are helicity suppressed. The hypothesis of additional physical neutral/charged Higgses can enhance such scalar contributions and give detectable effects especially in B physics. ... More

FCNC portals to the dark sectorNov 28 2011Mar 27 2012The most general basis of operators parametrizing a low-scale departure from the SM particle content is constructed. The SM gauge invariance is enforced, and operators of lowest dimensions are retained separately for a new light neutral particle of spin ... More

Back to 1974: The $\mathcal Q$-oniumMar 24 2016Jul 04 2016We show that the 750 GeV di-photon excess could be explained by the ${\mathcal Q}-$onium system of a new QCD-like theory with fermions vectorial under the SM. Beside the spin-0 di-photon singlet this scenario predicts almost degenerate colored scalars ... More

Could a light Higgs boson illuminate the dark sector?Jan 23 2012May 21 2012The impact a new neutral light particle of spin 0, 1/2, 1, or 3/2 could have on the tiny width of a light Higgs boson is systematically analyzed. To this end, we include all the relevant effective interactions, whether renormalizable or not, and review ... More

Shedding light on CP violation in the charm system via D to V gamma decaysMay 14 2012Recent evidence for direct CP violation in non-leptonic charm decays cannot be easily accommodated within the Standard Model (SM). On the other hand, it fits well in new physics models generating CP violating Delta C=1 chromomagnetic dipole operators. ... More

ElectroWeak Precision Observables at One-Loop in Higgsless modelsOct 11 2010Mar 12 2012We study the viability of generic Higgsless models at low energies when compliance with EWPO and unitarity constraints up to the TeV scale are imposed. Our analysis shows that consistency with S and T can be achieved at the one-loop level even with a ... More

Lepton flavor violation in type I + III seesawAug 24 2009Feb 12 2014In the presence of a low scale seesaw of type I + III, flavor violating effects in the leptonic sector are expected. Their presence in the charged sector is due to the mixing of the fermionic vector-like weak triplets with the chiral doublets, which cause ... More

Searching for new spin-0 resonances at LHCbJan 19 2016Apr 22 2016We study the phenomenology of light spin-0 particles and stress that they can be efficiently searched for at the LHCb experiment in the form of dimuon resonances. Given the large production cross sections in the forward rapidity region together with the ... More

Forward-Backward t tbar Asymmetry from Anomalous Stop Pair ProductionFeb 28 2011Apr 13 2011We analyse a simple Standard Model (SM) extension with only two new light fields: a scalar partner of the top (stop) (with mass above m_t) and a light neutral fermion chi^0 (with mass of a few GeV), coupled to SM quarks via a Yukawa interaction. We show ... More

Lepton energy moments in semileptonic charm decaysApr 01 2010Aug 05 2010We search for signals of Weak Annihilation in inclusive semileptonic D decays. We consider both the widths and the lepton energy moments, which are quite sensitive probes. Our analysis of Cleo data shows no clear evidence of Weak Annihilation, and allows ... More

Di-photon portal to warped gravityMar 22 2016May 09 2016The diphoton excess around 750 GeV observed by ATLAS and CMS can be interpreted as coming from a massive spin-2 excitation. We explore this possibility in the context of warped five-dimensional models with the Standard Model (SM) fields propagating in ... More

Discovering Dark Matter Through Flavor Violation at the LHCJul 04 2011We show that the discovery channel for dark matter (DM) production at colliders can be through flavor violating interactions resulting in a novel signature of a single top and large missing transverse energy. We discuss several examples where the production ... More

Tree-level contributions to the rare decays B+ --> pi+ nu anti-nu, B+ --> K+ nu anti-nu, and B+ --> K*+ nu anti-nu in the Standard ModelAug 08 2009The tree-level contributions to the rare decays B+ --> pi+ nu anti-nu, B+ --> K+ nu anti-nu, and B+ --> K*+ nu anti-nu are analyzed and compared to those occurring in K+ --> pi+ nu anti-nu, D+ --> pi+ nu anti-nu, and Ds+ --> pi+ nu anti-nu. It is shown ... More

On the origin of the D0 like-sign dimuon charge asymmetryJul 18 2012Sep 01 2015We reconsider the recent observation by the D0 experiment of a sizable like-sign dimuon charge asymmetry, highlighting that it could be affected by CP-violating New Physics contributions not only in Bd- and Bs-meson mixings, but also in semileptonic decays ... More

Constraining the dipole moments of the top quarkJul 15 2011Aug 02 2013We investigate the direct and indirect bounds on dipole operators involving the top quark. A careful analysis shows that the experimental upper limit on the neutron electric dipole moment strongly constrains the chromo-electric dipole of the top. We improve ... More

Discerning New Physics in Top-Antitop Production using Top Spin Observables at Hadron CollidersMay 01 2012Aug 22 2012Copious production of top-antitop quark pairs at hadron colliders has enabled various probes into the properties and interactions of top quarks. Among the various presently measured observables, the forward-backward asymmetry (FBA) in t tbar production ... More

On the matrix elements of dB=0 operators in the heavy meson decay widthsApr 10 2008We determine the chiral corrections to the matrix elements of the Delta B=0 four-quark operators which are relevant to the studies of the ratios of lifetimes of heavy-light mesons as well as to the power corrections to the inclusive semileptonic heavy-to-light ... More

D PhysicsFeb 16 2007Recently a lot of new experimental results on open charm hadrons have appeared. In particular many D meson resonances have been discovered. We discuss strong decays of positive and negative parity charmed mesons within heavy meson chiral perturbation ... More

Lepton flavor universality violation without new sources of quark flavor violationApr 20 2017Jan 12 2018We show that new physics models without new flavor violating interactions can explain the recent anomalies in the $b\to s\ell^+\ell^-$ transitions. The $b\to s\ell^+\ell^-$ arises from a $Z'$ penguin which automatically predicts the $V-A$ structure for ... More

Flipping t tbar asymmetries at the Tevatron and the LHCMay 21 2012We show that the charge asymmetry in t tbar production at the LHC, A_C, and the forward-backward asymmetry at the Tevatron, A_FB, are in general not tightly correlated. They can even have opposite signs, if the underlying new physics (NP) model is general ... More

(Total) Domination in PrismsJun 27 2016With the aid of hypergraph transversals it is proved that $\gamma_t(Q_{n+1}) = 2\gamma(Q_n)$, where $\gamma_t(G)$ and $\gamma(G)$ denote the total domination number and the domination number of $G$, respectively, and $Q_n$ is the $n$-dimensional hypercube. ... More

Strong electronic correlations from Hund's couplingJul 12 2012Jul 22 2012Strong electronic correlations are often associated with the proximity of a Mott insulating state. In recent years however, it has become increasingly clear that the Hund's rule coupling (intra-atomic exchange) is responsible for strong correlations in ... More

Strong Traces Model of Self-Assembly Polypeptide StructuresJul 25 2013A novel self-assembly strategy for polypeptide nanostructure design was presented in [Design of a single-chain polypeptide tetrahedron assembled from coiled-coil segments, Nature Chemical Biology 9 (2013) 362--366]. The first mathematical model (polypeptide ... More

Spin-orbit coupling in three-orbital Kanamori impurity model and its relevance for transition-metal oxidesAug 21 2017We investigate the effects of the spin-orbit coupling (SOC) in a three-orbital impurity model with Kanamori interaction using the numerical renormalization group method. We focus on the impurity occupancy $N_d=2$ relevant to the dynamical mean-field theory ... More

Low-energy physics of three-orbital impurity model with Kanamori interactionJun 24 2016We discuss the low-energy physics of the three-orbital Anderson impurity model with the Coulomb interaction term of the Kanamori form which has orbital SO(3) and spin SU(2) symmetry and describes systems with partially occupied $t_{2g}$ shells. We focus ... More

b to d d s bar transition and constraints on new physics in B^- decaysMay 24 2006Sep 05 2006The b to d d s bar transition gives extremely small branching ratios within the standard model, thus providing an appropriate ground for testing new physics. Using renormalization group technique we determine the Wilson coefficients and the mixing of ... More

The phenomenology of the di-photon excess and $h\toτμ$ within 2HDMJun 22 2016The diphoton excess around $m_S=750$ GeV observed at ATLAS and CMS can be interpreted as coming from $S=H$ and $A$, the neutral components of a second Higgs doublet. If so, then the consistency of the light Higgs decays with the Standard Model predictions ... More

Disentangling Flavor Violation in the Top-Higgs Sector at the LHCApr 04 2014Jul 16 2014We study the LHC phenomenology of flavor changing Yukawa couplings between top quark, Higgs boson, and either an up or charm quark. Such $tuh$ or $tch$ couplings arise for instance in models in which Higgs sector is extended by the existence of additional ... More

Probing anomalous tWb interactions with rare B decaysSep 11 2011Precision studies of top quark properties are currently underway at the LHC and Tevatron colliders with the prospect of probing anomalous t-W -b interactions. In the mean time, recent experimental results for the B_{d,s} - \bar{B}_{d,s} oscillation observables, ... More

Interplay of t --> b W Decay and B_q Meson Mixing in Minimal Flavor Violating ModelsFeb 21 2011Jul 06 2011Precise measurements of the top quark decay properties at hadron colliders offer interesting new possibilities of testing the standard model. At the same time, recent intriguing experimental results concerning CP violation in the B_d and B_s systems have ... More

New physics in t-> b W decay at next-to-leading order in QCDOct 12 2010Nov 12 2010We consider contributions of non-standard tbW effective operators to the decay of an unpolarized top quark into a bottom quark and a W gauge boson at next-to-leading order in QCD. We find that the dipole operator O_{LR} contribution to the transverse-plus ... More

Signatures of NP models in top FCNC decay t --> c(u) l+ l-Dec 01 2008Feb 24 2009Among other roles the LHC will play a role of the top "factory" and it will give us unique possibility to study new physics signatures in different ways. Many scenarios of new physics allow top quark FCNC decays. Using most general model independent Lagrangian ... More

Non-Fermi-liquid fixed point in multi-orbital Kondo impurity model relevant for Hund's metalsJul 16 2019Due to the separation between the spin and the orbital screening scales, the normal state of Hund's metals at ambient temperature can be loosely characterized as a partially coherent state with fluctuating spins and quenched orbital moments. With the ... More

A Blockchain-based Decentralized Self-balancing Architecture for the Web of ThingsApr 21 2019Edge computing is a distributed computing paradigm that relies on computational resources of end devices in a network to bring benefits such as low bandwidth utilization, responsiveness, scalability and privacy preservation. Applications range from large ... More

Slow quenches in Chern insulator ribbonsMay 29 2019We investigate slow quenches in Chern insulators in ribbon geometry. We consider the Qi-Wu-Zhang model and slowly ramp the parameters (large time of the quench $\tau$) from a non-topological (Chern number = 0) to a topological regime (Chern number $\ne$ ... More

Emergence of Gauss' Law in a $Z_2$ Lattice Gauge TheoryApr 10 2019We explore a $Z_2$ Hamiltonian lattice gauge theory in one spatial dimension with a coupling $h$, without imposing any Gauss' law constraint. We show that in our model $h=0$ is a free deconfined quantum critical point containing massless staggered fermions ... More

Artificial intelligence and pediatrics: A synthetic mini reviewFeb 16 2018The use of artificial intelligence intelligencein medicine can be traced back to 1968 when Paycha published his paper Le diagnostic a l'aide d'intelligences artificielle, presentation de la premiere machine diagnostri. Few years later Shortliffe et al. ... More

Adversarial examples for generative modelsFeb 22 2017We explore methods of producing adversarial examples on deep generative models such as the variational autoencoder (VAE) and the VAE-GAN. Deep learning architectures are known to be vulnerable to adversarial examples, but previous work has focused on ... More

Chiral behavior of the B(s,d)-Bbar(s,d) mixing amplitude in the Standard Model and beyondDec 19 2006Jun 01 2007We compute the chiral logarithmic corrections to the Bd and Bs mixing amplitudes in the Standard Model and beyond. We then investigate the impact of the inclusion of the lowest-lying scalar heavy-light states to the decay constants and bag-parameters ... More

nodewatcher: A Substrate for Growing Your own Community NetworkJan 11 2016Community networks differ from regular networks by their organic growth patterns -- there is no central planning body that would decide how the network is built. Instead, the network grows in a bottom-up fashion as more people express interest in participating ... More

SU(2) and SU(4) Kondo effect in double quantum dotsApr 16 2007We investigate serial double quantum dot systems with on-site and inter-site interaction by means of Sch\"onhammer-Gunnarsson projection-operator method. The ground state is established by the competition between extended Kondo phases and localized singlet ... More

Ground state of the parallel double quantum dot systemNov 18 2011We resolve the controversy regarding the ground state of the parallel double quantum dot system near half filling. The numerical renormalization group (NRG) predicts an underscreened Kondo state with residual spin-1/2 magnetic moment, ln 2 residual impurity ... More

Vibrational effects on low-temperature properties of molecular conductorsApr 16 2007We calculate characteristic correlation functions for the Anderson model with additional phonon-assisted coupling to the odd conduction channel. This model describes, for example, the behavior of a molecule embedded between two electrodes in linear transport ... More

QCD Corrections to Flavor Changing Neutral Coupling Mediated Rare Top Quark DecaysJul 15 2010Aug 04 2010Recently we have presented an analysis of flavor changing neutral coupling mediated radiative top quark decays at next-to-leading order in QCD. In the present paper we provide the details of the calculation of QCD corrections to t-> q gamma and t-> q ... More

Flavor Changing Neutral Coupling Mediated Radiative Top Quark Decays at Next-to-Leading Order in QCDApr 05 2010We compute the branching ratios for the rare top quark decays t to c gamma and t to c Z mediated by effective flavor changing neutral couplings at the next-to-leading order in QCD including the effects due to operator mixing. After re-suming contributions ... More

On Lepton Flavor Universality in Top Quark DecaysAug 02 2018Jan 15 2019We propose a novel strategy to test lepton flavor universality (LFU) in top decays, applicable to top pair production at colliders. Our proposal exploits information in kinematic distributions and mostly hinges on data-driven techniques, thus having very ... More

Kondo effect in double quantum dots with inter-dot repulsionMar 07 2006Apr 24 2006We investigate a symmetrical double quantum dot system serially attached to the leads. The emphasis is on the numerical analysis of finite inter-dot tunneling in the presence of inter-dot repulsive capacitive coupling. The results reveal the competition ... More

Uncountably many planar embeddings of unimodal inverse limit spacesMar 12 2016Sep 08 2016For point $x$ in the inverse limit space $X$ with a single unimodal bonding map we construct, with the use of symbolic dynamics, a planar embedding such that $x$ is accessible. It follows that there are uncountably many non-equivalent planar embeddings ... More

The Core Ingram Conjecture for non-recurrent critical pointsDec 22 2015We study inverse limit spaces of tent maps, and the Ingram Conjecture, which states that the inverse limit spaces of tent maps with different slopes are non-homeomorphic. When the tent map is restricted to its core, so there is no ray compactifying on ... More

Drell-Yan production of Heavy Vectors in Higgsless modelsMay 04 2009We study the Drell-Yan production of heavy vector and axial-vector states of generic Higgsless models at hadron colliders. We analyse in particular the l+l-, WZ, and three SM gauge boson final states. In the l+l- case we show how present Tevatron data ... More

On the B to D* tau nu Sensitivity to New PhysicsMar 12 2012Apr 02 2012B physics has played a prominent role in investigations of new physics effects at low-energies. Presently, the largest discrepancy between a standard model prediction and experimental measurements appears in the branching ratio of the charged current ... More

Use and misuse of ChPT in the heavy-light systemsOct 18 2007We discuss the range of validity of ChPT when applied to the systems of heavy-light mesons. Having in mind the recent experimental evidence according to which the heavy-light scalar and axial states are closer to the ground states than anticipated, we ... More

Chiral loop corrections to weak decays of B mesons to positive and negative parity charmed mesonsMay 31 2007We determine chiral loop corrections to the B meson decay amplitudes to positive and negative parity charmed mesons within a framework which combines heavy quark and chiral symmetries. Then we investigate the impact of the lowest-lying positive parity ... More

Review of new physics effects in t-tbar productionJul 26 2011Both CDF and DO report a forward-backward asymmetry in t-tbar production that is above the standard model prediction. We review new physics models that can give a large forward backward asymmetry in t-tbar production at the Tevatron and the constraints ... More

$E$-restricted double tracesOct 31 2016For a graph $G$ and $E \subseteq E(G)$, $E$-restricted strong trace is a closed walk which traverses every edge from $E$ once in each direction and every other edge twice in the same direction. In addition, every time a strong trace come to a vertex $v$ ... More

Janus-faced influence of the Hund's rule coupling in strongly correlated materialsJun 04 2011We show that in multi-band metals the correlations are strongly affected by the Hund's rule coupling, which depending on the filling promotes metallic, insulating or bad-metallic behavior. The quasiparticle coherence and the proximity to a Mott insulator ... More

Implications of perturbative unitarity for the $γγ$ resonance at 750 GeVApr 19 2016We study the constraints implied by partial wave unitarity on new physics models explaining the LHC di-photon excess at 750 GeV. We argue that the effective description in terms of the SM supplemented by a single scalar resonance breaks down at scales ... More

The Secret Sharer: Measuring Unintended Neural Network Memorization & Extracting SecretsFeb 22 2018Machine learning models based on neural networks and deep learning are being rapidly adopted for many purposes. What those models learn, and what they may share, is a significant concern when the training data may contain secrets and the models are public ... More

Higgs Uncovering Light Scalar Remnants of High Scale Matter UnificationAug 06 2012Dec 10 2012We consider the impact of colored scalars that can couple directly to matter fields on the recently measured h to gamma gamma excess. Among all possible candidates only scalar states transforming as (8, 2,1/2) and (6,3,1/3) under the Standard Model gauge ... More

Indirect Constraints on the Scalar Di-Photon Resonance at the LHCDec 28 2015Jun 02 2016Motivated by the tantalizing excesses recently reported in the di-photon invariant mass spectrum at the LHC, we scrutinize some implications of scalar di-photon resonances in high energy proton-proton collisions. In particular, indications of a large ... More

Can scalar leptoquarks explain the f_{D_s} puzzle?Jun 30 2009Jul 07 2009Motivated by the disagreement between experimental and lattice QCD results on the D_s decay constant we systematically reinvestigate role of leptoquarks in charm meson decays. We consider scalar leptoquarks that transform as a weak interaction triplet, ... More

Comments on the diphoton excess: critical reappraisal of effective field theory interpretationsMar 21 2016Jul 12 2016We consider the diphoton excess observed by ATLAS and CMS using the most up-to-date data and estimate the preferred enhancement in the production rate between 8 TeV and 13 TeV. Within the framework of effective field theory (EFT), we then show that for ... More

Confronting lepton flavor universality violation in B decays with high-$p_T$ tau lepton searches at LHCSep 22 2016We confront the indications of lepton flavor universality (LFU) violation observed in semi-tauonic $B$ meson decays with new physics (NP) searches using high $p_T$ tau leptons at the LHC. Using effective field theory arguments we correlate possible non-standard ... More

Band Structure and Terahertz Optical Conductivity of Transition Metal Oxides: Theory and Application to CaRuO$_3$Dec 25 2014Sep 05 2015Density functional plus dynamical mean field calculations are used to show that in transition metal oxides, rotational and tilting (GdFeO$_3$-type) distortions of the ideal cubic perovskite structure produce a multiplicity of low-energy optical transitions ... More

Hall coefficient signals orbital differentiation in the Hund's metal Sr$_2$RuO$_4$Feb 14 2019May 09 2019The Hall coefficient $R_H$ of Sr$_2$RuO$_4$ exhibits a non-monotonic temperature dependence with two sign reversals. We show that this puzzling behavior is the signature of two crossovers which are key to the physics of this material. The increase of ... More

An algebraic approach to enumerating non-equivalent double traces in graphsNov 30 2015Recently designed biomolecular approaches to build single chain polypeptide polyhedra as molecular origami nanostructures have risen high interest in various double traces of the underlying graphs of these polyhedra. Double traces are walks that traverse ... More

A three-person chess-like game without Nash equilibriaOct 25 2016We give an example of a three person chess-like game that has no Nash equilibrium in pure stationary strategies. The game has seven positions, four outcomes (a unique cycle and three terminal positions), and its normal form is of size 2 x 2 x 4 only. ... More