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81 papers · 1 filter
A Lieb-Thirring inequality for singular values
Koenraad M. R. Audenaert
Let and be positive semidefinite matrices. We investigate the conditions under which the Lieb-Thirring inequality can be extended to singular values. That is, for which val…
Quantum Simulation of the Hubbard Model: The Attractive Route
A. F. Ho, M. A. Cazalilla, T. Giamarchi
We study the conditions under which, using a canonical transformation, the phases sought after for the repulsive Hubbard model, namely a Mott insulator in the paramagnetic and anti…
Response of the CALICE Si-W Electromagnetic Calorimeter Physics Prototype to Electrons
CALICE Collaboration
A prototype Silicon-Tungsten electromagnetic calorimeter (ECAL) for an International Linear Collider (ILC) detector was installed and tested during summer and autumn 2006 at CERN.…
The Expressive Power of Binary Submodular Functions
Stanislav Zivny, David A. Cohen, Peter G. Jeavons
It has previously been an open problem whether all Boolean submodular functions can be decomposed into a sum of binary submodular functions over a possibly larger set of variables.…
Efficient Multiplication of Dense Matrices over GF(2)
Martin Albrecht, Gregory Bard, William Hart
We describe an efficient implementation of a hierarchy of algorithms for multiplication of dense matrices over the field with two elements (GF(2)). In particular we present our imp…
Search for the Z(4430)^- at BABAR
The BABAR Collaboration, B. Aubert
We report the results of a search for decay to or in $B^{-,0}\to \jpsiπ^- K^{0,+}$ and $B^{-,0}\to \psitwos π^- K^{0,+}$ decays. The data were colle…
Emile Borel's difficult days in 1941
Laurent Mazliak, Glenn Shafer
The German forces occupying Paris arrested Emile Borel and three other members of the Académie des Sciences in October 1941 and released them about five weeks later. Why? We examin…
The exact evaluation of the corner-to-corner resistance of an M x N resistor network: Asymptotic expansion
J. W. Essam, F. Y. Wu
We study the corner-to-corner resistance of an M x N resistor network with resistors r and s in the two spatial directions, and obtain an asymptotic expansion of its exact expressi…
Automorphism groups of cyclic codes
Rolf Bienert, Benjamin Klopsch
In this article we study the automorphism groups of binary cyclic codes. In particular, we provide explicit constructions for codes whose automorphism groups can be described as (a…
Quantum boolean functions
Ashley Montanaro, Tobias J. Osborne
In this paper we introduce the study of quantum boolean functions, which are unitary operators f whose square is the identity: f^2 = I. We describe several generalisations of well-…
Abstract commensurators of profinite groups
Yiftach Barnea, Mikhail Ershov, Thomas Weigel
In this paper we initiate a systematic study of the abstract commensurators of profinite groups. The abstract commensurator of a profinite group is a group which depe…
Information propagation through quantum chains with fluctuating disorder
Christian K. Burrell, Jens Eisert, Tobias J. Osborne
We investigate the propagation of information through one-dimensional quantum chains in fluctuating external fields. We find that information propagation is suppressed, but in a qu…
Measurement of the e+e- --> b anti-b cross section between sqrt(S)=10.54 and 11.20 GeV
The BABAR Collaboration, B. Aubert
We report e+e- --> b anti-b cross section measurements by the BABAR experiment performed during an energy scan in the range of 10.54 to 11.20 GeV at the PEP-II e+e- collider. A tot…
A Search for Recoiling Against
The BABAR Collaboration, B. Aubert
We present a search for the decay $\B^+ \to \ell^+ ν_{\ell} (\ell = τ, μ, \mathrm{or} e)$ in decays recorded with the Babar detector at the…
Almost commuting unitaries with spectral gap are near commuting unitaries
Tobias J. Osborne
Let M_n be the collection of n x n complex matrices equipped with operator norm. Suppose U, V \in M_n are two unitary matrices, each possessing a gap larger than Δin their spectrum…
From Data to the p-Adic or Ultrametric Model
Fionn Murtagh
We model anomaly and change in data by embedding the data in an ultrametric space. Taking our initial data as cross-tabulation counts (or other input data formats), Correspondence…
Quantum Tomographic Reconstruction with Error Bars: a Kalman Filter Approach
Koenraad M. R. Audenaert, S. Scheel
We present a novel quantum tomographic reconstruction method based on Bayesian inference via the Kalman filter update equations. The method not only yields the maximum likelihood/o…
Weyl's Predicative Classical Mathematics as a Logic-Enriched Type Theory
Robin Adams, Zhaohui Luo
We construct a logic-enriched type theory LTTW that corresponds closely to the predicative system of foundations presented by Hermann Weyl in Das Kontinuum. We formalise many resul…
Measurement of time dependent CP asymmetry parameters in B0 meson decays to omega K0S, eta'K0, and pi0K0S
The BABAR Collaboration, B. Aubert
We present measurements of the time-dependent CP-violation parameters S and C in the decays omega K0S, eta'K0, reconstructed as eta'K0S and eta'K0L, and pi0K0S. The data sample cor…
Measurements of the Semileptonic Decays $\Bb\to D\ell\nub$ and $\Bb\to D^*\ell\nub$ Using a Global Fit to $D X\ell\nub$ Final States
The BABAR Collaboration, B. Aubert
Semileptonic decays to ( or ) are selected by reconstructing and combinations from a sample of 230 million $Υ(4S) \to B\bar{B…
Evidence for X(3872) --> psi(2S) gamma in B+/- --> X(3872) K+/- decays, and a study of B --> ccbar gamma K
The BABAR Collaboration, B. Aubert
In a search for B --> ccbar gamma K decays with the BaBar detector, where ccbar includes J/psi and psi(2S), and K includes K+, Ks, and K*(892), we find evidence for X(3872) --> J/p…
Measurement of the Branching Fractions of the Radiative Charm Decays and
The BABAR Collaboration, B. Aubert
We present a measurement of the branching fractions for the Cabibbo-favored radiative decay, , and the Cabibbo-suppressed radiative decay, …
Measurement of the branching fraction B(tau- --> K0 pi- nu) using the BaBar detector
B. Aubert
A preliminary measurement of the branching fraction B(tau- --> K0 pi- nu) is made using 384.6 fb-1 of e+e- collision data provided by the PEP-II collider, operating primarily at sq…
On Complexity of Minimum Leaf Out-branching Problem
Peter Dankelmann, Gregory Gutin, Eun Jung Kim
Given a digraph , the Minimum Leaf Out-Branching problem (MinLOB) is the problem of finding in an out-branching with the minimum possible number of leaves, i.e., vertices of…