28,864 research outputs found

    Recent results on Top quark Physics with the ATLAS and CMS experiments

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    An overview of the most recent results on top quark physics obtained using proton-proton collision data collected with the ATLAS and the CMS experiments at 7 TeV center-of-mass energy is given. Measurements for inclusive and differential top quark pair or single top quark production in different final states are reviewed. Top properties such as W helicity in top decays, electric charge, charge asymmetry and spin correlations of top quark pairs, among others have also been measured by the LHC experiments. All the measurements are found to be consistent with the Standard Model predictions with a good level of accuracy. The latest results in the measurement of the top quark mass at the LHC are also presented and discussed.Comment: Contribution to the proceedings the 47th Rencontres de Moriond Electroweak session 201

    Quantum Myers effect and its supergravity dual for D0/D4 systems

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    The presence of a distant D4-brane is used to further investigate the duality between M-theory and D0-brane quantum mechanics. A polarization of the quantum mechanical ground state is found. A similar deformation arises for the bubble of normal space found near D0-branes in classical supergravity solutions. These deformations are compared and are shown to have the same structure in each case.Comment: 7 pages, based on a talk presented at the conference MRST 2001 at London, Canad

    String bits and the Myers effect

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    Based on the non-abelian effective action for D1-branes, a new action for matrix string theory in non-trivial backgrounds is proposed. Once the background fields are included, new interactions bring the possibility of non-commutative solutions i.e. The Myers effect for ``string bits'' .Comment: 6 pages, talk given in the at the 24th annual Montreal-Rochester-Syracuse-Toronto (MRST) Conference on Theoretical Physics, May 15-1702 2002. Proceedings will be published by the American Institute of Physic
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