Institution
Hungarian Academy of Sciences
Government•Budapest, Hungary•
About: Hungarian Academy of Sciences is a government organization based out in Budapest, Hungary. It is known for research contribution in the topics: Catalysis & Population. The organization has 21510 authors who have published 56712 publications receiving 1612286 citations. The organization is also known as: Magyar Tudományos Akadémia & MTA.
Topics: Catalysis, Population, Adsorption, Ion, Gene
Papers published on a yearly basis
Papers
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21 Sep 2012
TL;DR: In this paper, a search was made for events containing an energetic jet and an imbalance in transverse momentum using a data sample of pp collisions at a center-of-mass energy of 7 TeV.
Abstract: A search has been made for events containing an energetic jet and an imbalance in transverse momentum using a data sample of pp collisions at a center-of-mass energy of 7 TeV. This signature is common to both dark matter and extra dimensions models. The data were collected by the CMS detector at the LHC and correspond to an integrated luminosity of 5.0 inverse femtobarns. The number of observed events is consistent with the standard model expectation. Constraints on the dark matter-nucleon scattering cross sections are determined for both spin-independent and spin-dependent interaction models. For the spin-independent model, these are the most constraining limits for a dark matter particle with mass below 3.5 GeV, a region unexplored by direct detection experiments. For the spin-dependent model, these are the most stringent constraints over the 0.1-200 GeV mass range. The constraints on the Arkani-Hamed, Dimopoulos, and Dvali model parameter MD determined as a function of the number of extra dimensions are also an improvement over the previous results.
227 citations
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Bergen University College1, CERN2, University of Bergen3, University of Oslo4, Lawrence Livermore National Laboratory5, Czech Technical University in Prague6, Academy of Sciences of the Czech Republic7, Yale University8, Panjab University, Chandigarh9, University of Santiago de Compostela10, Hungarian Academy of Sciences11, GSI Helmholtz Centre for Heavy Ion Research12, Variable Energy Cyclotron Centre13, Aligarh Muslim University14, Kurchatov Institute15
TL;DR: The single- and double-diffractive cross sections were calculated combining relative rates of diffraction with inelastic cross sections and compared to previous measurements at proton–antiproton and proton-proton colliders at lower energies, to measurements by other experiments at the LHC, and to theoretical models.
Abstract: Measurements of cross sections of inelastic and diffractive processes in proton--proton collisions at LHC energies were carried out with the ALICE detector. The fractions of diffractive processes in inelastic collisions were determined from a study of gaps in charged particle pseudorapidity distributions: for single diffraction (diffractive mass $M_X 3$) $\sigma_{\rm DD}/\sigma_{\rm INEL} = 0.11 \pm 0.03, 0.12 \pm 0.05$, and $0.12^{+0.05}_{-0.04}$, respectively at $\sqrt{s} = 0.9, 2.76$, and 7 TeV. To measure the inelastic cross section, beam properties were determined with van der Meer scans, and, using a simulation of diffraction adjusted to data, the following values were obtained: $\sigma_{\rm INEL} = 62.8^{+2.4}_{-4.0} (model) \pm 1.2 (lumi)$ mb at $\sqrt{s} =$ 2.76 TeV and $73.2^{+2.0}_{-4.6} (model) \pm 2.6 (lumi)$ mb at $\sqrt{s}$ = 7 TeV. The single- and double-diffractive cross sections were calculated combining relative rates of diffraction with inelastic cross sections. The results are compared to previous measurements at proton--antiproton and proton--proton colliders at lower energies, to measurements by other experiments at the LHC, and to theoretical models.
227 citations
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TL;DR: In this paper, a measurement of W and Z production cross sections in pp collisions at 7 TeV is presented, where electron and muon decay channels are analyzed in a data sample collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns.
Abstract: A measurement of inclusive W and Z production cross sections in pp collisions at sqrt(s)=7 TeV is presented. The electron and muon decay channels are analyzed in a data sample collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns. The measured inclusive cross sections are sigma(pp-> WX) B(W-> l nu) = 10.30 +/- 0.02 (stat.) +/- 0.10 (syst.) +/- 0.10 (th.) +/- 0.41 (lumi.) nb and sigma(pp -> ZX) B(Z-> l^+l^-) = 0.974 +/- 0.007 (stat.) +/- 0.007 (syst.) +/- 0.018 (th.) +/- 0.039 (lumi.) nb, limited to the dilepton invariant mass range 60 to 120 GeV. The luminosity-independent cross section ratios are [sigma(pp->WX) B(W-> l nu)]/[sigma(pp-> ZX) B(Z->l^+l^-)] = 10.54 +/- 0.07 (stat.) +/- 0.08 (syst.) +/- 0.16 (th.) and [sigma(pp->W^+X) B(W^+ -> l^+nu)] / [sigma(pp->W^- X) B(W^- -> l^- nu)] = 1.421 +/- 0.006 (stat.) +/- 0.014 (syst.) +/- 0.029 (th.). The measured values agree with next-to-next-to-leading order QCD cross section calculations based on recent parton distribution functions.
227 citations
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12 Apr 2012
TL;DR: In this article, a search for a Higgs boson decaying into two photons is described using a dataset recorded by the CMS experiment at the LHC from pp collisions at a centre-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 inverse femtobarns.
Abstract: A search for a Higgs boson decaying into two photons is described. The analysis is performed using a dataset recorded by the CMS experiment at the LHC from pp collisions at a centre-of-mass energy of 7 TeV, which corresponds to an integrated luminosity of 4.8 inverse femtobarns. Limits are set on the cross section of the standard model Higgs boson decaying to two photons. The expected exclusion limit at 95% confidence level is between 1.4 and 2.4 times the standard model cross section in the mass range between 110 and 150 GeV. The analysis of the data excludes, at 95% confidence level, the standard model Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The largest excess of events above the expected standard model background is observed for a Higgs boson mass hypothesis of 124 GeV with a local significance of 3.1 sigma. The global significance of observing an excess with a local significance greater than 3.1 sigma anywhere in the search range 110-150 GeV is estimated to be 1.8 sigma. More data are required to ascertain the origin of this excess.
227 citations
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TL;DR: It is shown that resonant conversion of NV(0) to NV(-) significantly improves spectral stability of theNV(-) defect and allows high fidelity initialization of the spin qubit.
Abstract: In this Letter, the photoinduced switching of the single nitrogen-vacancy (NV) center between two different charge states, negative (${\mathrm{NV}}^{\ensuremath{-}}$) and neutral (${\mathrm{NV}}^{0}$), is studied under resonant excitation at liquid helium temperature. We show that resonant conversion of ${\mathrm{NV}}^{0}$ to ${\mathrm{NV}}^{\ensuremath{-}}$ significantly improves spectral stability of the ${\mathrm{NV}}^{\ensuremath{-}}$ defect and allows high fidelity initialization of the spin qubit. Based on density functional theory calculations a novel mechanism involving an Auger ionization of ${\mathrm{NV}}^{\ensuremath{-}}$ and charge transfer of an electron from the valence band to ${\mathrm{NV}}^{0}$ is discussed. This study provides further insight into the charge dynamics of the NV center, which is relevant for quantum information processing based on an ${\mathrm{NV}}^{\ensuremath{-}}$ defect in diamond.
226 citations
Authors
Showing all 21526 results
Name | H-index | Papers | Citations |
---|---|---|---|
Jasvinder A. Singh | 176 | 2382 | 223370 |
Alexander S. Szalay | 166 | 936 | 145745 |
Ashok Kumar | 151 | 5654 | 164086 |
György Buzsáki | 150 | 446 | 96433 |
Daniel Bloch | 145 | 1819 | 119556 |
Brajesh C Choudhary | 143 | 1618 | 108058 |
Geoffrey Burnstock | 141 | 1488 | 99525 |
Suman Bala Beri | 137 | 1608 | 104798 |
Vipin Bhatnagar | 137 | 1756 | 104163 |
Paul Slovic | 136 | 506 | 126658 |
Manjit Kaur | 135 | 1540 | 97378 |
Gabor Istvan Veres | 135 | 1349 | 96104 |
Dimitri Bourilkov | 134 | 1489 | 96884 |
Georges Azuelos | 134 | 1294 | 90690 |
Michael Tytgat | 134 | 1449 | 94133 |