2,353 research outputs found

    Heavy-Flavour Production in Pb-Pb collisions at the LHC with ALICE

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    Results on open heavy-flavour production in Pb-Pb collisions at sqrt{s_NN} = 2.76 TeV measured with ALICE at the LHC are presented. The nuclear modification factors, extracted in three different channels, show a strong suppression in central collisions. The measured D-meson azimuthal anisotropy indicates a non-zero v2, which is similar to the one of charged hadrons.Comment: 4 pages, 3 figures, conference proceedings PLH

    Physics with the ALICE Transition Radiation Detector

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    The ALICE Transition Radiation Detector (TRD) significantly enlarges the scope of physics observables studied in ALICE, because it allows due to its electron identification capability to measure open heavy-flavour production and quarkonium states, which are essential probes to characterize the Quark-Gluon-Plasma created in nucleus-nucleus collisions at LHC. In addition the TRD enables to enhance rare probes due to its trigger contributions. We report on the first results of the electron identification capability of the ALICE Transition Radiation Detector (TRD) in pp collisions at s\sqrt{s} = 7 TeV using a one-dimensional likelihood method on integrated charge measured in each TRD chamber. The analysis of heavy flavour production in pp collisions at s\sqrt{s} = 7 TeV with this particle identification method, which extends the ptp_{t} range of the existing measurement from ptp_{t} = 4 GeV/c to 10 GeV/c and reduces the systematic uncertainty due to particle identification, is presented. The performance of the application of the TRD electron identification in the context of J/\psi measurements in Pb-Pb collisions is also shown.Comment: 6 pages; 9 figures; conference proceedings: TRDs for the third Millennium 4th Workshop on Advanced Transition Radiation Detectors for Accelerator and Space Application

    Heavy Flavours in ALICE

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    The measurement of heavy-flavour production allows us to characterise the properties of the deconfined medium created in Pb-Pb collisions at LHC energies. pp collisions serve as a reference for Pb-Pb studies, and p-Pb collisions provide information on initial and/or final state effects related to cold nuclear matter. We report on open heavy-flavour as well as quarkonium production in p-Pb collisions at sNN\sqrt{s_{\rm NN}} = 5.02 TeV. The experimental data are compared with results from Pb-Pb collisions as well as with various theoretical predictions.Comment: 4 pages, 9 figures, Conference proceedings, 49th Rencontres de Moriond, QCD and High Energy Interactions sessio

    Particle Identification with the ALICE Transition Radiation Detector

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    The Transition Radiation Detector (TRD) provides particle identification in the ALICE central barrel. In particular, it allows electron identification via the measurement of transition radiation for p>\rm p > 1 GeV/cc, where pions can no longer be rejected sufficiently via specific energy loss in the ALICE Time Projection Chamber. The ALICE TRD is uniquely designed to record the time evolution of the signal, which allows even better electron/pion separation. In addition, the electron identification capability of the TRD can be used on-line to trigger at level 1. The particle identification and its performance in pp, p-Pb and Pb-Pb collisions employing various methods, such as truncated mean signal, one- and two-dimensional likelihood on integrated charge and neural network, will be presented. The measurement of J/ψ\psi mesons in Pb-Pb collisions is given as a case study to show how well the TRD contributes to physics analyses due to its excellent pion suppression.Comment: 4 pages; 7 figures, Proceedings of RICH2013 Conference, 2-6 Dec 201

    Dielectron Production in C+C Collisions at 1 GeV/u and the Solution to the DLS Puzzle

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    The production of e+e- pairs in C+C collisions at 1 GeV/u was investigated with the HADES experiment at GSI, Darmstadt. In the invariant-mass region 0.15GeV/c2Mee0.5GeV/c2 0.15\: GeV/c^{2} \leq M_{ee} \leq 0.5\: GeV/c^{2} the measured pair yield shows a strong excess above the contribution expected from hadron decays after freeze-out. The data are in good agreement with the results of the former DLS experiment for the same system and energy.Comment: 6 pages, 3 figures, conference proceedings: Quark Matter 2008, Jaipur (India), 4-10 February 2008, submitted to J. Phys. G: Nuclear and Particle Physic

    Tourism Stakeholder Assessment - Presentation

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    The Tourism Stakeholder Assessment Project was undertaken partly in response to anecdotal evidence regarding inconsistencies with branding, lack of strategic direction, and regional cooperation that affects the overall competitiveness of the tourism industry in Humboldt County, CA. The goal of the project was to better understand the state of the tourism industry in Humboldt County and what steps can be taken to keep improving the industry. The presentation contains results presented at a public meeting in spring 2019

    Resident Attitude Towards Tourism in Humboldt County California

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    The primary purpose of this study was to investigate both resident attitudes toward tourism in general and resident attitudes towards cannabis tourism in Humboldt County, California. The survey was of adult individuals residing in any part of Humboldt County, California. Between March 2017 and August 2017, county residents were targeted to complete the survey either through an in‐person or online questionnaire
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