659 research outputs found

    Differential cross section measurements in the H→ττH\rightarrow\tau\tau decay channel with CMS data of proton-proton collisions at the Large Hadron Collider at CERN

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    Wirkungsquerschnitte der Erzeugung von Higgs-Bosonen in Proton-Proton-Kollisionen werden im Zerfallskanal zu zwei Tau-Leptonen gemessen. HierfĂŒr werden 137,2/fb Daten verwendet, die von der CMS-Kollaboration wĂ€hrend Run-2 des Large-Hadron-Colliders aufgenommen wurden. Die Messung umfasst die dominanten ProduktionskanĂ€le, Gluonfusion und Vektorbosonfusion, und wird differentiell in bis zu zwölf kinematischen Regionen durchgefĂŒhrt. Multiklassifikation basierend auf neuronalen Netzwerken wird zur Klassifizierung der Kollisionsereignisse den angestrebten Signalkomponenten entsprechend und zur Verbesserung der SensitivitĂ€t eingesetzt

    Minimal and complete set of descriptors for IR-absorption spectra of liquid H2–D2 mixtures

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    The IR spectra of liquid hydrogen isotopologues (Q2_{2} = H2_{2}, D2_{2}, T2_{2}, HD, HT, DT) are dominated by the interaction induced absorption. Therefore, the complexity tremendously increases with the number of different isotopologues in the sample. As we aim for a system independent calibration of IR absorption spectroscopy against all six isotopologues and three ortho–para ratios, we need a minimal and complete set of descriptors to predict the spectra and to decrease the needed calibration effort. For this, we grouped the absorption lines into three groups: absorption on monomers, phonons, and molecular dimers. In particular, molecular dimers contribute to the absolute number of absorption lines in the spectra of mixed isotopologues. To develop and test the set of descriptors, we make use of three spectra: a pure H2_{2} sample, a pure D2_{2} sample, and a mixed H2_{2}–D2_{2} sample. We show a detailed analysis of these three spectra in the first and second vibrational branch in the range from 2000 cm−1^{-1} to 9000 cm−1^{-1}. The set of descriptors found within this work can be used to identify and predict all lines in this range for liquid H2_{2}–D2_{2} mixtures

    Minimal and complete set of descriptors for IR-absorption spectra of liquid H2–D2 mixtures

    Get PDF
    The IR spectra of liquid hydrogen isotopologues (Q2_{2} = H2_{2}, D2_{2}, T2_{2}, HD, HT, DT) are dominated by the interaction induced absorption. Therefore, the complexity tremendously increases with the number of different isotopologues in the sample. As we aim for a system independent calibration of IR absorption spectroscopy against all six isotopologues and three ortho–para ratios, we need a minimal and complete set of descriptors to predict the spectra and to decrease the needed calibration effort. For this, we grouped the absorption lines into three groups: absorption on monomers, phonons, and molecular dimers. In particular, molecular dimers contribute to the absolute number of absorption lines in the spectra of mixed isotopologues. To develop and test the set of descriptors, we make use of three spectra: a pure H2_{2} sample, a pure D2_{2} sample, and a mixed H2_{2}–D2_{2} sample. We show a detailed analysis of these three spectra in the first and second vibrational branch in the range from 2000 cm−1^{-1} to 9000 cm−1^{-1}. The set of descriptors found within this work can be used to identify and predict all lines in this range for liquid H2_{2}–D2_{2} mixtures

    Resource-aware Research on Universe and Matter: Call-to-Action in Digital Transformation

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    Given the urgency to reduce fossil fuel energy production to make climate tipping points less likely, we call for resource-aware knowledge gain in the research areas on Universe and Matter with emphasis on the digital transformation. A portfolio of measures is described in detail and then summarized according to the timescales required for their implementation. The measures will both contribute to sustainable research and accelerate scientific progress through increased awareness of resource usage. This work is based on a three-days workshop on sustainability in digital transformation held in May 2023.Comment: 20 pages, 2 figures, publication following workshop 'Sustainability in the Digital Transformation of Basic Research on Universe & Matter', 30 May to 2 June 2023, Meinerzhagen, Germany, https://indico.desy.de/event/3748

    Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at root s=13 TeV

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    A search is presented for new particles produced at the LHC in proton-proton collisions at root s = 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 fb(-1), collected in 2017-2018 with the CMS detector. Machine learning techniques are used to define separate categories for events with narrow jets from initial-state radiation and events with large-radius jets consistent with a hadronic decay of a W or Z boson. A statistical combination is made with an earlier search based on a data sample of 36 fb(-1), collected in 2016. No significant excess of events is observed with respect to the standard model background expectation determined from control samples in data. The results are interpreted in terms of limits on the branching fraction of an invisible decay of the Higgs boson, as well as constraints on simplified models of dark matter, on first-generation scalar leptoquarks decaying to quarks and neutrinos, and on models with large extra dimensions. Several of the new limits, specifically for spin-1 dark matter mediators, pseudoscalar mediators, colored mediators, and leptoquarks, are the most restrictive to date.Peer reviewe

    Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at root s=13 TeV