208 research outputs found

    The AM++ board for the silicon vertex tracker upgrade at CDF

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    The silicon vertex trigger (SVT) processor has been built at CDF for extremely fast (~10 musec) and high precision (roughly offline quality) pattern recognition. It is going to be upgraded to have at high luminosity the same crucial role it had in the data collection for the RUN II physics. A modern version of most of the SVT boards is obtained with a minimum of new hardware. A pulsar board, which was designed for and is now being used in the CDF level-2 upgrade, has been used for most the SVT functions that needed to be upgraded. The pulsar combines the power of dedicated hardware with the flexibility of general purpose CPUs. The new sequencer (AMS) that controls the associative memory (AM) operation for pattern recognition, uses a small fraction of a pulsar board. The same pulsar is powerful enough to also carry out the road warrior function (AMS-RW), to remove redundant track candidates prior to track fitting. We report about the AMS-RW design, tests and performance

    Study of ordered hadron chains with the ATLAS detector

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    La lista completa de autores que integran el documento puede consultarse en el archivo

    A search for resonances decaying into a Higgs boson and a new particle X in the XH→qqbb final state with the ATLAS detector

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    A search for heavy resonances decaying into a Higgs boson (HH) and a new particle (XX) is reported, utilizing 36.1 fb1^{-1} of proton-proton collision data at s=\sqrt{s} = 13 TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle XX is assumed to decay to a pair of light quarks, and the fully hadronic final state XHqqˉbbˉXH \rightarrow q\bar q'b\bar b is analysed. The search considers the regime of high XHXH resonance masses, where the XX and HH bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XHXH mass versus XX mass is scanned for evidence of a signal, over a range of XHXH resonance mass values between 1 TeV and 4 TeV, and for XX particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XHXH and XX masses, on the production cross-section of the XHqqˉbbˉXH\rightarrow q\bar q'b\bar b resonance

    Study of the material of the ATLAS inner detector for Run 2 of the LHC

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    Instituto de Física La Plat

    Search for single production of vector-like quarks decaying into Wb in pp collisions at s=8\sqrt{s} = 8 TeV with the ATLAS detector

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    Measurement of the charge asymmetry in top-quark pair production in the lepton-plus-jets final state in pp collision data at s=8TeV\sqrt{s}=8\,\mathrm TeV{} with the ATLAS detector

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    Measurement of the bbb\overline{b} dijet cross section in pp collisions at s=7\sqrt{s} = 7 TeV with the ATLAS detector

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