Results for "Kazuki Sakurai"

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Controlling ISR in sparticle mass reconstructionAug 10 2010Aug 12 2010Use of inclusive MT2 distribution for sparticle mass determination is discussed. We define new parameters MT2(min) and MT2mod(min), which are a kind of minimum of sub-systerm MT2 values. Their endpoints are less affected by initial state radiations. We ... More
Limits on Electroweak Instanton-Induced Processes with Multiple Boson ProductionSep 28 2018Feb 07 2019Recently, the CMS collaboration has reported their search for electroweak instanton-like processes with anomalous $B+L$ violation assuming multi-fermion but zero-boson final states. On the other hand, many theoretical studies suggest that anomalous $B+L$ ... More
Determining the helicity structure of third generation resonancesDec 16 2011Jul 02 2012We examine methods that have been proposed for determining the helicity structure of decays of new resonances to third generation quarks and/or leptons. We present analytical and semi-analytical predictions and assess the applicability of the relevant ... More
Long-lived bino and wino in supersymmetry with heavy scalars and higgsinosJun 29 2015Oct 30 2015We point out that there is a parameter region in supersymmetry with heavy scalars and higgsinos, in which the heavier of bino and wino becomes long-lived as a consequence of the heavy higgsinos. In this region these electroweak gaugino sectors are secluded ... More
Constraint from recent ATLAS results on non-universal sfermion mass models and naturalnessJun 20 2011Dec 02 2011We investigate the impact of recent direct supersymmetry (SUSY) searches on a non-universal sfermion mass scenario focusing on naturalness. One of the advantages of this scenario is that the non-universality between third generation and first two generation ... More
Constraining compressed supersymmetry using leptonic signaturesJun 28 2012We study the impact of the multi-lepton searches at the LHC on supersymmetric models with compressed mass spectra. For such models the acceptances of the usual search strategies are significantly reduced due to requirement of large effective mass and ... More
LHC constraints on Yukawa unification in SO(10)Dec 20 2011Feb 23 2012LHC constraints on the recently proposed SUSY SO(10) GUT model with top-bottom-tau Yukawa unification are investigated. In this model, various phenomenological constraints are in concord with the Yukawa unification thanks to the negative sign of \mu, ... More
Search for Sphalerons in Proton-Proton CollisionsJan 14 2016In a recent paper, Tye and Wong (TW) have argued that sphaleron-induced transitions in high-energy proton-proton collisions should be enhanced compared to previous calculations, based on a construction of a Bloch wave function in the periodic sphaleron ... More
Triple Higgs boson production at a 100 TeV proton-proton colliderAug 26 2015Feb 01 2016We consider triple Higgs boson production at a future 100 TeV proton-proton collider. We perform a survey of viable final states and compare and contrast triple production to Higgs boson pair production. Focussing on the $hhh \rightarrow (b\bar{b}) (b\bar{b}) ... More
Light stops emerging in WW cross section measurements?Mar 22 2013Aug 12 2013Recent ATLAS and CMS measurements show a slight excess in the WW cross section measurement. While still consistent with the Standard Model within 1-2 sigma, the excess could be also a first hint of physics beyond the Standard Model. We argue that this ... More
Multi-hadron final states in RPV supersymmetric models with extra mattersMay 15 2014The gluino mass has been constrained by various search channels at the LHC experiments and the recent analyses are even sensitive to the cases where gluinos decay to quarks at the end of the decay chains through the baryonic RPV operator. We argue that ... More
Search for Sphalerons: IceCube vs. LHCMar 21 2016We discuss the observability of neutrino-induced sphaleron transitions in the IceCube detector, encouraged by a recent paper by Tye and Wong (TW), which argued on the basis of a Bloch wave function in the periodic sphaleron potential that such transitions ... More
Gauge-mediated supersymmetry breaking with generalized messenger sector at LHCOct 29 2009Mar 12 2010We consider the generalized gauge mediated supersymmetry breaking (GMSB) models with the messenger fields which do not form the complete multiplets of SU(5) GUT symmetry. Such a situation may happen in the anomalous U(1) GUT scenario because the mass ... More
Proton decay testing low energy SUSYJul 20 2017We show that gauge coupling unification in SUSY models can make a non-trivial interconnection between collider and proton decay experiments. Under the assumption of precise gauge coupling unification in the MSSM, the low energy SUSY spectrum and the unification ... More
Can R-parity violation hide vanilla supersymmetry at the LHC?Sep 25 2012Jan 17 2013Current experimental constraints on a large parameter space in supersymmetric models rely on the large missing energy signature. This is usually provided by the lightest neutralino which stability is ensured by the R-parity. However, if the R-parity is ... More
Tagging a mono-top signature in Natural SUSYOct 19 2016We study the feasibility of probing a region of Natural Supersymmetry where the stop and higgsino masses are compressed. Although this region is most effectively searched for in the mono-jet channel, this signature is present in many other non-supersymmetric ... More
A closer look at a hint of SUSY at the 8 TeV LHCFeb 19 2015Mar 20 2015A recent CMS analysis has reported the observation of an excess in the invariant mass distribution of the opposite-sign same-flavour lepton pair, which can be interpreted as a kinematic edge due to new physics. Using collider simulation tools, we recast ... More
Higgs boson to di-tau channel in Chargino-Neutralino searches at the LHCApr 03 2014We consider chargino-neutralino production, $\tilde{\chi}_2^0 \tilde{\chi}_1^\pm \to (h \tilde{\chi}_1^0)(W^\pm \tilde{\chi}_1^0)$, which results in Higgs boson final states that subsequently decay (inclusively) to leptons (either $h\rightarrow \tau^+\tau^-$ ... More
Mono-top Signature from Supersymmetric $t \bar t H$ ChannelApr 13 2016We point out that a distinctive mono-top signature is present in Natural SUSY scenarios when a scalar top-quark and higgsinos are almost mass degenerate. This signature originates from a supersymmetric counter part of the $t \bar t H$ process, i.e. $pp ... More
Polynomials, Riemann surfaces, and reconstructing missing-energy eventsMar 17 2011Sep 13 2011We consider the problem of reconstructing energies, momenta, and masses in collider events with missing energy, along with the complications introduced by combinatorial ambiguities and measurement errors. Typically, one reconstructs more than one value ... More
A Review on Tachyon Condensation in Open String Field TheoriesFeb 15 2001May 07 2001We review the recent studies of tachyon condensation in string field theory. After introducing the open string field theory both for bosonic string and for superstring, we use them to examine the conjecture that the unstable configurations of the D-brane ... More
On Ghost Structure of Vacuum Superstring Field TheoryAug 01 2002Nov 07 2002After discussing the general form of the kinetic operator around the tachyon vacuum, we determine the specific form of the pure-ghost kinetic operator Q^ by requiring the twist invariance of the action. We obtain a novel result that the Grassmann-even ... More
Relativistic Landau Models and Generation of Fuzzy SpheresNov 15 2015Aug 23 2016Non-commutative geometry naturally emerges in low energy physics of Landau models as a consequence of level projection. In this work, we proactively utilize the level projection as an effective tool to generate fuzzy geometry. The level projection is ... More
Higher Dimensional Quantum Hall Effect as A-Class Topological InsulatorMar 20 2014Aug 02 2014We perform a detail study of higher dimensional quantum Hall effects and A-class topological insulators with emphasis on their relations to non-commutative geometry. There are two different formulations of non-commutative geometry for higher dimensional ... More
SUSY Quantum Hall Effect on Non-Anti-Commutative GeometryOct 01 2007Feb 22 2008We review the recent developments of the SUSY quantum Hall effect [hep-th/0409230, hep-th/0411137, hep-th/0503162, hep-th/0606007, arXiv:0705.4527]. We introduce a SUSY formulation of the quantum Hall effect on supermanifolds. On each of supersphere and ... More
Large deviations for simple random walk on percolations with long-range correlationsAug 10 2013Nov 01 2013We show quenched large deviations for the simple random walk on a certain class of percolations with long-range correlations. This class contains the supercritical Bernoulli percolations, the model considered by Drewitz, R'ath and Sapozhnikov and the ... More
Non-Commutative Geometry in Higher Dimensional Quantum Hall Effect as A-Class Topological InsulatorAug 04 2014We clarify relations between the higher dimensional quantum Hall effect and A-class topological insulator. In particular, we elucidate physical implications of the higher dimensional non-commutative geometry in the context of A-class topological insulator. ... More
Graded Hopf Maps and Fuzzy SuperspheresJun 24 2011Aug 26 2011We argue supersymmetric generalizations of fuzzy two- and four-spheres based on the unitary-orthosymplectic algebras, $uosp(N|2)$ and $uosp(N|4)$, respectively. Supersymmetric version of Schwinger construction is applied to derive graded fully symmetric ... More
Hyperbolic Supersymmetric Quantum Hall EffectSep 29 2008Jan 26 2009Developing a non-compact version of the SUSY Hopf map, we formulate the quantum Hall effect on a super-hyperboloid. Based on $OSp(1|2)$ group theoretical methods, we first analyze the one-particle Landau problem, and successively explore the many-body ... More
Non-Compact Hopf Maps and Fuzzy Ultra-HyperboloidsJul 09 2012Sep 14 2012Fuzzy hyperboloids naturally emerge in the geometries of D-branes, twistor theory, and higher spin theories. In this work, we perform a systematic study of higher dimensional fuzzy hyperboloids (ultra-hyperboloids) based on non-compact Hopf maps. Two ... More
Strong Koszulness of the toric ring associated to a cut idealOct 02 2014Oct 17 2014A cut ideal of a graph was introduced by Sturmfels and Sullivant. In this paper, we give a necessary and sufficient condition for toric rings associated to the cut ideal to be Strongly Koszul.
$Sp(4;\mathbb{R})$ Squeezing for Bloch Four-Hyperboloid via The Non-Compact Hopf MapApr 28 2019We explore the hyperbolic geometry of squeezed states in the perspective of the non-compact Hopf map. Based on analogies between squeeze operation and $Sp(2,\mathbb{R})$ hyperbolic rotation, two types of the squeeze operators, the (usual) Dirac- and the ... More
Quantum Hall Effect and Langlands ProgramJul 27 2017Oct 17 2017Recent advances in the Langlands program shed light on a vast area of modern mathematics from an unconventional viewpoint, including number theory, gauge theory, representation, knot theory and etc. By applying to physics, these novel perspectives endow ... More
Toric ideals of series and parallel connections of matroidsDec 12 2013Jun 20 2015In 1980, White conjectured that the toric ideal associated to a matroid is generated by binomials corresponding to a symmetric exchange. In this paper, we prove that classes of matroids for which the toric ideal is generated by quadrics and that has quadratic ... More
Counting orbits of certain infinitely generated non-sharp discontinuous groups acting on the anti-de Sitter spaceJul 19 2019Generalizing an example of Gu\'{e}ritaud-Kassel([Geom.Topol.2017]), we construct a family of infinitely generated groups $\Gamma$ acting isometrically and properly discontinuously on the $3$-dimensional anti-de Sitter space ${\rm AdS}^{3}$. These groups ... More
Level-Expansion Analysis in NS Superstring Field Theory RevisitedMay 13 2003May 15 2003We study the level-expansion structure of the NS string field theory actions, mainly focusing on the modified (i.e. 0-picture in the NS sector) cubic superstring field theory. This theory has a non-trivial structure already at the quadratic level due ... More
Survey of the Tachyonic Lump in Bosonic String Field TheoryJun 08 2001Jun 15 2001We study some properties of the tachyonic lumps in the level truncation scheme of bosonic cubic string field theory. We find that several gauges work well and that the size of the lump as well as its tension is approximately independent of these gauge ... More
On a certain local identity for Lapid-Mao's conjecture and formal degree conjecture : even unitary group caseFeb 13 2019Lapid and Mao formulated a conjecture on an explicit formula of Whittaker Fourier coefficients of automorphic forms on quasi-split classical groups and metaplectic groups as an analogue of Ichino-Ikeda conjecture. They also showed that this conjecture ... More
Chiral Topological Insulator on Nambu 3-Algebraic GeometryMar 30 2014Aug 02 2014Chiral topological insulator (AIII-class) with Landau levels is constructed based on the Nambu 3-algebraic geometry. We clarify the geometric origin of the chiral symmetry of the AIII-class topological insulator in the context of non-commutative geometry ... More
Another generalization of the box-ball system with many kinds of ballsMar 11 2018A cellular automaton that is a generalization of the box-ball system with either many kinds of balls or finite carrier capacity is proposed and studied through two discrete integrable systems: nonautonomous discrete KP lattice and nonautonomous discrete ... More
Some results for range of random walk on graph with spectral dimension twoMar 19 2019We consider the range of the simple random walk on graphs with spectral dimension two. We give a form of strong law of large numbers under a certain uniform condition, which is satisfied by not only the square integer lattice but also a class of fractal ... More
Tachyonic Kink and Lump-like Solutions in Superstring Field TheoryApr 26 2001Apr 30 2001We construct a kink solution on a non-BPS D-brane using Berkovits' formulation of superstring field theory in the level truncation scheme. The tension of the kink reproduces 95% of the expected BPS D-brane tension. We also find a lump-like solution which ... More
Hopf Maps, Lowest Landau Level, and Fuzzy SpheresSep 07 2010Oct 12 2010This paper is a review of monopoles, lowest Landau level, fuzzy spheres, and their mutual relations. The Hopf maps of division algebras provide a prototype relation between monopoles and fuzzy spheres. Generalization of complex numbers to Clifford algebra ... More
Unification of Laughlin and Moore-Read States in SUSY Quantum Hall EffectMay 31 2007May 07 2008Based on the recently proposed SUSY quantum Hall effect, we show that Laughlin and Moore-Read states are related by a hidden SUSY transformation. Regarding the SUSY Laughlin wavefunction as a master wavefunction, Laughlin and Moore-Read states appear ... More
Quantum Hall Liquid on a Noncommutative SuperplaneMar 22 2005Feb 17 2006Supersymmetric quantum Hall liquids are constructed on a noncommutative superplane. We explore a supersymmetric formalism of the Landau problem. In the lowest Landau level, there appear spin-less bosonic states and spin-1/2 down fermionic states, which ... More
The Split-Algebras and Non-compact Hopf MapsMay 18 2009May 25 2010We develop a noncompact version of the Hopf maps based on the split algebras. The split algebras consist of three species: split-complex numbers, split quaternions, and split octonions. They correspond to three noncompact Hopf maps that represent topological ... More
Geometrical Construction of Supertwistor TheoryMay 18 2008Supertwistor theory is geometrically constructed based on the SUSY Hopf map. We derive a new incidence relation for the geometrical supertwistor theory. The present supertwistor exhibits remarkable properties: Minkowski space need not be complexified ... More
Supersymmetric Chern-Simons Theory and Supersymmetric Quantum Hall LiquidJun 01 2006Aug 27 2006We develop a supersymmetric extension of Chern-Simons theory and Chern-Simons-Landau-Ginzburg theory for supersymmetric quantum Hall liquid. Supersymmetric counterparts of topological and gauge structures peculiar to the Chern-Simons theory are inspected ... More
Supersymmetric Quantum Hall Effect on Fuzzy SupersphereNov 15 2004Apr 21 2005Supersymmetric quantum Hall liquids are constructed on a supersphere in a supermonopole background. We derive a supersymmetric generalization of the Laughlin wavefunction, which is a ground state of a hard-core $OSp(1|2)$ invariant Hamiltonian. We also ... More
Topological Aspects of Matters and Langlands ProgramDec 31 2018Jan 30 2019In the framework of Langlands program, we offer a unified description of the integer and fractional quantum Hall effect as well as the fractal nature of energy spectra of 2d Bloch electrons. We categorify topological invariants on the Brillouin Zone and ... More
Hausdorff dimensions for graph-directed measures driven by infinite rooted treesMar 11 2017Jan 22 2018We give upper and lower bounds for the Hausdorff dimensions for a class of graph-directed measures when its underlying directed graph is the infinite N-ary tree. These measures are different from graph-directed self-similar measures driven by finite directed ... More
Affinoids in the Lubin-Tate perfectoid space and special cases of the local Langlands correspondenceSep 08 2016Nov 29 2018Following Weinstein, Boyarchenko-Weinstein and Imai-Tsushima, we construct a family of affinoids in the Lubin-Tate perfectoid space and formal models such that the cohomology of the reduction of each formal model realizes the local Langlands correspondence ... More
The second homology group of the homological Goldman Lie algebraJul 13 2012Dec 12 2012We determine the second homology group of the homological Goldman Lie algebra for an oriented surface.
Comments on Solutions of Vacuum Superstring Field TheoryApr 17 2002Aug 01 2002We study classical solutions of vacuum version of Berkovits' superstring field theory, focusing on the (super)ghost sector. We first argue that the supersliver state which is annihilated by eta_0, though it has the correct quantum numbers and solves the ... More
Toward Open-Closed String Theoretical Description of Rolling TachyonJun 11 2003Jul 16 2003We consider how the time-dependent decay process of an unstable D-brane should be described in the full (quantum) open-closed string theory. It is argued that the system, starting from the unstable D-brane configuration, will evolve in time into the time-independent ... More
Affinoids in the Lubin-Tate perfectoid space and special cases of the local Langlands correspondence in positive characteristicSep 08 2016Following Weinstein, Boyarchenko-Weinstein and Imai-Tsushima, we construct a family of affinoids in the Lubin-Tate perfectoid space and formal models such that the cohomology of the reduction of each formal model realizes the local Langlands correspondence ... More
Enlargement of subgraphs of infinite graphs by Bernoulli percolationJun 19 2015Jul 09 2016We consider changes in properties of a subgraph of an infinite graph resulting from the addition of open edges of Bernoulli percolation on the infinite graph to the subgraph. We give the triplet of an infinite graph, one of its subgraphs, and a property ... More
Unions of random walk and percolation on infinite graphsNov 13 2016We consider a random object that is associated with both random walks and random media, specifically, the superposition of a configuration of subcritical Bernoulli percolation on an infinite connected graph and the trace of the simple random walk on the ... More
A finite Toda representation of the box-ball system with box capacitySep 10 2011A connection between the finite ultradiscrete Toda lattice and the box-ball system is extended to the case where each box has own capacity and a carrier has a capacity parameter depending on time. In order to consider this connection, new carrier rules ... More
Hofstadter's Butterfly and Langlands DualityJul 27 2017We dig out a deeper mathematical structure of the quantum Hall system from a perspective of the Langlands program. An algebraic expression of the Hamiltonian with the quantum group is a cornerstone. The Langlands duality of the quantum group sheds light ... More
Foundation of Quantum Optimal Transport and ApplicationsJun 24 2019Quantum optimal transportation seeks an operator which minimizes the total cost of transporting a quantum state to another state, under some constraints that should be satisfied during transportation. We formulate this issue by extending the Monge-Kantorovich ... More
Unions of random walk and percolation on infinite graphsNov 13 2016May 30 2018We consider a random object that is associated with both random walks and random media, specifically, the superposition of a configuration of subcritical Bernoulli percolation on an infinite connected graph and the trace of the simple random walk on the ... More
Weierstrass equations for Jacobian fibrations on a certain K3 surfaceMay 15 2012Jul 23 2012In this paper we give the Weierstrass equations for Jacobian fibrations on the K3 surface that is the minimal resolution of the double covering of projective plane ramified along generic six lines.
Enlargement of subgraphs of infinite graphs by Bernoulli percolationJun 19 2015Jun 10 2017We consider changes in properties of a subgraph of an infinite graph resulting from the addition of open edges of Bernoulli percolation on the infinite graph to the subgraph. We give the triplet of an infinite graph, one of its subgraphs, and a property ... More
Reconstructing particle masses from pairs of decay chainsMay 14 2010Jun 01 2010A method is proposed for determining the masses of the new particles N,X,Y,Z in collider events containing a pair of effectively identical decay chains Z to Y+jet, Y to X+l_1, X to N+l_2, where l_1, l_2 are opposite-sign same-flavour charged leptons and ... More
The ATLAS Di-boson Excess Could Be an R-parity Violating Di-smuon ExcessNov 04 2015Jan 22 2016We propose a new possible explanation of the ATLAS di-boson excess: that it is due to heavy resonant slepton production, followed by decay into di-smuons. The smuon has a mass not too far from the W and Z masses, and so it is easily confused with W or ... More
Weak antilocalization in (111) thin films of a topological crystalline insulator SnTeAug 19 2014We grew single-crystal thin films of a topological crystalline insulator (TCI) SnTe with a smooth surface at the atomic scale by molecular beam epitaxy (MBE). In the magnetoresistance (MR) measurement, we observed both positive and negative components ... More
Searching for third-generation composite leptoquarks at the LHCOct 19 2010Feb 11 2011Fermion masses may arise via mixing of elementary fermions with composite fermions of a strong sector in scenarios of strongly-coupled electroweak symmetry breaking. The strong sector may contain leptoquark states with masses as light as several hundred ... More
Perturbative Higgs CP violation, unitarity and phenomenologyNov 16 2016Nov 24 2016Perturbative probability conservation provides a strong constraint on the presence of new interactions of the Higgs boson. In this work we consider CP violating Higgs interactions in conjunction with unitarity constraints in the gauge-Higgs and fermion-Higgs ... More
Detecting underabundant neutralinosJun 23 2015Oct 10 2015The electroweak sector may play a crucial role in discovering supersymmetry. We systematically investigate the patterns of the MSSM-like electroweakinos, when the neutralino relic abundance $\Omega_\chi h^2\leq 0.12$, that is, also admitting for multi-component ... More
Handling jets + missing E_T channel using inclusive mT2Aug 07 2008Oct 06 2008The ATLAS and CMS experiments at the Large Hadron Collider (LHC) may discover the squarks (\tilde{q}) and gluino (\tilde{g}) of the minimal supersymmetric standard model (MSSM) in the early stage of the experiments if their masses are lighter than 1.5 ... More
New model for radiatively generated Dirac neutrino masses and lepton flavor violating decays of the Higgs bosonApr 15 2019We propose a new mechanism to explain neutrino masses with lepton number conservation, in which the Dirac neutrino masses are generated at the two-loop level involving a dark matter candidate. In this model, branching ratios of lepton flavor violating ... More
Reconstruction of Higgs bosons in the di-tau channel via 3-prong decayOct 06 2012Mar 19 2013We propose a method for reconstructing the mass of a particle, such as the Higgs boson, decaying into a pair of tau leptons, of which one subsequently undergoes a 3-prong decay. The kinematics is solved using information from the visible decay products, ... More
A new approach to gauge coupling unification and proton decayFeb 16 2019May 07 2019An analytical formalism, including RG running at two loop order, is used to link the supersymmetric and GUT spectra in any GUT model in which the three gauge couplings unify. In each specific GUT model, one can then fully explore the interplay between ... More
Rigidity of manifolds with boundary under a lower Ricci curvature boundApr 15 2014Dec 24 2015We study Riemannian manifolds with boundary under a lower Ricci curvature bound, and a lower mean curvature bound for the boundary. We prove a volume comparison theorem of Bishop-Gromov type concerning the volumes of the metric neighborhoods of the boundaries. ... More
Concentration of $1$-Lipschitz functions on manifolds with boundary with Dirichlet boundary conditionDec 12 2017Aug 16 2018In this paper, we consider a concentration of measure problem on Riemannian manifolds with boundary. We study concentration phenomena of non-negative $1$-Lipschitz functions with Dirichlet boundary condition around zero, which is called boundary concentration ... More
Perturbative Higgs CP violation, unitarity and phenomenologyNov 16 2016Perturbative probability conservation provides a strong constraint on the presence of new interactions of the Higgs boson. In this work we consider CP violating Higgs interactions in conjunction with unitarity constraints in the gauge-Higgs and fermion-Higgs ... More
A new approach to gauge coupling unification and proton decayFeb 16 2019A novel analytical formalism is proposed, linking the supersymmetric and GUT spectra in any GUT model in which the three gauge couplings unify. In each specific GUT model, one can then fully explore the interplay between the pattern of supersymmetry breaking ... More
Mono-top Signature from Fermionic Top-partnerOct 25 2017We investigate mono-top signatures arising from phenomenological models of fermionic top-partners, which are degenerate in mass and decay into a bosonic dark matter candidate, either spin-0 or spin-1. Such a model provides a mono-top signature as a smoking-gun, ... More
Interpreting 750 GeV Diphoton Excess in Plain NMSSMMar 07 2016Jul 04 2016NMSSM has enough ingredients to explain the diphoton excess at 750 GeV: singlet-like (pseudo) scalar ($a$) $s$ and higgsinos as heavy vector-like fermions. We consider the production of the 750 GeV singlet-like pseudo scalar a from a decay of the doublet-like ... More
Fastlim: a fast LHC limit calculatorFeb 03 2014Fastlim is a tool to calculate conservative limits on extensions of the Standard Model from direct LHC searches without performing any Monte Carlo event generation. The program reconstructs the visible cross sections from pre-calculated efficiency tables ... More
Simplified models of dark matter with a long-lived co-annihilation partnerFeb 02 2017Jun 09 2017We introduce a new set of simplified models to address the effects of 3-point interactions between the dark matter particle, its dark co-annihilation partner, and the Standard Model degree of freedom, which we take to be the tau lepton. The contributions ... More
Gravitino vs Neutralino LSP at the LHCMay 14 2019Using the latest LHC data, we analyse and compare the lower limits on the masses of gluinos and the lightest stop in two natural supersymmetric motivated scenarios: one with a neutralino being the lightest supersymmetric particle (LSP) and the other one ... More
Disentangling Higgs-Top Couplings in Associated ProductionDec 19 2013Mar 03 2014In the presence of CP violation, the Higgs-top coupling may have both scalar and pseudoscalar components, $\kappa_t$ and ${\tilde \kappa_t}$, which are bounded indirectly but only weakly by the present experimental constraints on the Higgs-gluon-gluon ... More
Prospects for observing charginos and neutralinos at a 100 TeV proton-proton colliderOct 06 2014We investigate the prospects for discovering charginos and neutralinos at a future $pp$ collider with $\sqrt{s} = 100$ TeV. We focus on models where squarks and sleptons are decoupled -- as motivated by the LHC data. Our initial study is based on models ... More
`Stop' that ambulance! New physics at the LHC?Jun 03 2014Dec 01 2014A number of LHC searches now display intriguing excesses. Most prominently, the measurement of the $W^+W^-$ cross-section has been consistently $\sim 20\%$ higher than the theoretical prediction across both ATLAS and CMS for both 7 and 8 TeV runs. More ... More
$B+L$ violation at colliders and new physicsJan 10 2018May 07 2018Chiral electroweak anomalies predict fermion interactions that violate baryon ($B$) and lepton number ($L$), and can be dressed with large numbers of Higgs and gauge bosons. The estimation of the total $B+L$ violating rate from an initial two-particle ... More
Mixed anomalies of chiral algebras compactified to smooth quasi-projective surfacesDec 14 2007Feb 25 2015Some time ago, the chiral algebra theory of Beilinson-Drinfeld was expected to play a central role in the convergence of divergence in mathematical physics of superstring theory for quantization of gauge theory and gravity. Naively, this algebra plays ... More
Special reflecting features of a three-dimensional photonic crystal depending on cut surfaces oriented in the direction [001] within photonic bandgapMar 05 2019The reflecting features (reflected spectrum and phase) on the surface of pure-material plate depend on refractive index, extinction coefficient, incident angle, polarization direction and so on. The features, however, do not depend on a cut surface that ... More
One dimensional weighted Ricci curvature and displacement convexity of entropiesJun 26 2017May 02 2018In the present paper, we prove that a lower $1$-weighted Ricci curvature bound is equivalent to a convexity of entropies on the Wasserstein space. Based on such characterization, we provide inequalities of Brunn-Minkowski type, Prekopa-Leindler type and ... More
The ATLAS Tau Trigger Performance during LHC Run 1 and Prospects for Run 2Sep 09 2014Triggering on hadronic tau decays is essential for a wide variety of analyses of interesting physics processes at ATLAS. The ATLAS tau trigger combines information from the tracking detectors and calorimeters to identify the signature of hadronically ... More
Comparison geometry of manifolds with boundary under a lower weighted Ricci curvature boundDec 27 2016Dec 07 2017We study Riemannian manifolds with boundary under a lower weighted Ricci curvature bound. We consider a curvature condition in which the weighted Ricci curvature is bounded from below by the density function. Under the curvature condition, and a suitable ... More
An explicit formula for a weight enumerator of linear-congruence codesAug 28 2018An explicit formula for a weight enumerator of linear-congruence codes is provided. This extends the work of Bibak and Milenkovic [IEEE ISIT (2018) 431-435] addressing the binary case to the non-binary case. Furthermore, the extension simplifies their ... More
A generalization of dual symmetry and reciprocity for symmetric algebrasMay 18 2016Slicing a module into semisimple ones is useful to study modules. Loewy structures provide a means of doing so. To establish the Loewy structures of projective modules over a finite dimensional symmetric algebra over a field $F$, the Landrock lemma is ... More
First-principles studies for structural transitions in ordered phase of cubic approximant Cd6CaJun 09 2008Recently low-temperature structural transition has been reported for complex cubic compounds Cd6M (M=Ca, Yb, Y, rare earth) and it is believed that the transition is due to orientational ordering of an atomic shell in the icosahedral cluster in Cd6M. ... More
Topological Phases in a Weyl Semimetal MultilayerJan 19 2017Apr 07 2017We investigate multilayer systems of a normal insulator and a Weyl semimetal. We calculate the bulk band structure and determine phase diagrams by changing the thickness of the normal insulator and that of the Weyl semimetal layer using two models; one ... More
Bubble cloud dynamics in an ultrasound fieldApr 30 2018The dynamics of bubble clouds induced by high-intensity focused ultrasound are investigated in a regime where the cloud size is similar to the ultrasound wavelength. High-speed images show that the cloud is asymmetrical; the bubbles nearest the source ... More
Eulerian-Lagrangian method for simulation of cloud cavitationDec 02 2017Dec 05 2017We present a coupled Eulerian-Lagrangian method to simulate cloud cavitation in a compressible liquid. The method is designed to capture the strong, volumetric oscillations of each bubble and the bubble-scattered acoustics. The dynamics of the bubbly ... More
Nature of the randomness-induced quantum spin liquids in two dimensionsJul 14 2019The nature of the randomness-induced quantum spin liquid state, the random-singlet state, is investigated in two dimensions (2D) by means of the exact-diagonalization and the Hams-de Raedt methods for several frustrated lattices, e.g., the triangular, ... More
Dualities in ABJM Matrix Model from Closed String ViewpointJul 21 2016Aug 03 2016We propose a new formalism to study the ABJM matrix model. Contrary to expressing the fractional brane background with the Wilson loops in the open string formalism, we formulate the Wilson loop expectation value from the viewpoint of the closed string ... More