3,363 research outputs found
Small-Size Resonant Photoacoustic Cell of Inclined Geometry for Gas Detection
A photoacoustic cell intended for laser detection of trace gases is
represented. The cell is adapted so as to enhance the gas-detection performance
and, simultaneously, to reduce the cell size. The cell design provides an
efficient cancellation of the window background (a parasite response due to
absorption of laser beam in the cell windows) and acoustic isolation from the
environment for an acoustic resonance of the cell. The useful photoacoustic
response from a detected gas, window background and noise are analyzed in
demonstration experiments as functions of the modulation frequency for a
prototype cell with the internal volume ~ 0.5 cm^3. The minimal detectable
absorption for the prototype is estimated to be ~ 1.2 10^{-8} cm^{-1} W
Hz^{-1/2}.Comment: 11 pages, 5 figure
Local Spectral Density for a Periodically Driven System of Coupled Quantum States with Strong Imperfection in Unperturbed Energies
A random matrix theory approach is applied in order to analyze the
localization properties of local spectral density for a generic system of
coupled quantum states with strong static imperfection in the unperturbed
energy levels. The system is excited by an external periodic field, the
temporal profile of which is close to monochromatic one. The shape of local
spectral density is shown to be well described by the contour obtained from a
relevant model of periodically driven two-states system with irreversible
losses to an external thermal bath. The shape width and the inverse
participation ratio are determined as functions both of the Rabi frequency and
of parameters specifying the localization effect for our system in the absence
of external field.Comment: 6 pages, 5 figures, submitted to Optics and Spectroscop
A posteriori inclusion of parton density functions in NLO QCD final-state calculations at hadron colliders: the APPLGRID project
A method to facilitate the consistent inclusion of cross-section measurements based on complex final-states from HERA, TEVATRON and the LHC in proton parton density function (PDF) fits has been developed. This can be used to increase the sensitivity of LHC data to deviations from Standard Model predictions. The method stores perturbative coefficients of NLO QCD calculations of final-state observables measured in hadron colliders in look-up tables. This allows the a posteriori inclusion of parton density functions (PDFs), and of the strong coupling, as well as the a posteriori variation of the renormalisation and factorisation scales in cross-section calculations. The main novelties in comparison to original work on the subject are the use of higher-order interpolation of Lagrangian form, which substantially improves the trade-off between accuracy and memory use, and a CPU and computer memory optimised way to construct and store the look-up table using modern software tools. It is demonstrated that a sufficient accuracy on the cross-section calculation can be achieved with reasonably small look-up table size by using the examples of jet production and electro-weak boson (Z, W) production in proton-proton collisions at a center-of-mass energy of 14 TeV at the LHC. The use of this technique in PDF fitting is demonstrated in a PDF-fit to HERA data and simulated LHC jet cross-sections as well as in a study of the jet cross-section uncertainties at various centre-of-mass energies. © Springer-Verlag / Società Italiana di Fisica 201
ОБ ЭКСТРЕМАЛЬНОМ СВОЙСТВЕ АППРОКСИМАЦИЙ ЭРМИТА−ПАДЕ ЭКСПОНЕНЦИАЛЬНЫХ ФУНКЦИЙ
In this article we study the extremal properties of the Hermite–Padé approximations of type I for the exponential system {eλpz}kp=0 with different arbitrary real and complexes λ0, λ1, …, λk. The theorems proved complement the known results of P. Borwein, F. Wielonsky, K. Driver.В работе изучаются экстремальные свойства аппроксимаций Эрмита–Паде I типа для системы экспонент {eλpz}kp=0 произвольными различными действительными и комплексными показателями λ0, λ1, …, λk. Доказанные теоремы дополняют известные результаты П. Борвейна, Ф. Вилонского, K. Дривер
ЭКСТРЕМАЛЬНЫЕ СВОЙСТВА АППРОКСИМАЦИЙ ЭРМИТА–ПАДЕ ЭКСПОНЕНЦИАЛЬНЫХ ФУНКЦИЙ
The paper deals with extremal properties of diagonal Hermite-Pad’e approximants of type I for exponential system {eλpz}kp=0with arbitrary λ0, λ1, …, λk. Proved theorems complement known results of P. P. Borwein, F. Wielonsky.В работе изучаются экстремальные свойства диагональных аппроксимаций Эрмита–Паде I типа для системы экспонент {eλpz}kp=0с произвольными различными действительными показателями λ0, λ1, …, λk. Доказанные теоремы дополняют известные результаты П. Борвейна и Ф. Вилонского
АСИМПТОТИЧЕСКИЕ СВОЙСТВА МНОГОЧЛЕНОВ ЭРМИТА
The article deals with asymptotic properties of diagonal Hermite–Pade’s approximants of type I for the exponential system {eλ j z}k j = 0 with arbitrary real λ0, λ1, ..., λk. The proved theorems complement the known results of P. Borwein, F. Wielonsky, and A. P. Starovoitov.Изучаются асимптотические свойства диагональных аппроксимаций Эрмита–Паде I типа для системы экспонент {eλ j z}k j = 0 произвольными различными действительными показателями λ0, λ1, ..., λk. Доказанные теоремы дополняют известные результаты П. Борвейна, Ф. Вилонского и А. П. Старовойтова
Hunt for new phenomena using large jet multiplicities and missing transverse momentum with ATLAS in 4.7 fb−1 of s√=7TeV proton-proton collisions
Results are presented of a search for new particles decaying to large numbers of jets in association with missing transverse momentum, using 4.7 fb−1 of pp collision data at s√=7TeV collected by the ATLAS experiment at the Large Hadron Collider in 2011. The event selection requires missing transverse momentum, no isolated electrons or muons, and from ≥6 to ≥9 jets. No evidence is found for physics beyond the Standard Model. The results are interpreted in the context of a MSUGRA/CMSSM supersymmetric model, where, for large universal scalar mass m 0, gluino masses smaller than 840 GeV are excluded at the 95% confidence level, extending previously published limits. Within a simplified model containing only a gluino octet and a neutralino, gluino masses smaller than 870 GeV are similarly excluded for neutralino masses below 100 GeV