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  • Publication . Article . Other literature type . Research . Preprint . 2021
    Open Access
    Authors: 
    Ayse Polatoz; Willard Johns; Sinan Sagir; Soureek Mitra; Michael Tytgat; Ram Krishna Dewanjee; Austin Baty; Graham Wilson; Attilio Santocchia; Erhan Gülmez; +552 more
    Countries: United Kingdom, Spain, Italy, Croatia, Serbia, United States, Turkey, Italy, France, Croatia ...
    Project: EC | AMVA4NewPhysics (675440), EC | INSIGHTS (765710), EC | LHCTOPVLQ (752730)

    Evidence for Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production of the Higgs boson via gluon fusion, via vector boson fusion, in association with a vector boson, and in association with a top quark-antiquark pair. The analysis is performed using proton-proton collision data at s√ = 13 TeV, corresponding to an integrated luminosity of 137 fb−1, recorded by the CMS experiment at the CERN LHC. An excess of events over the back- ground expectation is observed in data with a significance of 3.0 standard deviations, where the expectation for the standard model (SM) Higgs boson with mass of 125.38 GeV is 2.5. The combination of this result with that from data recorded at s√ = 7 and 8 TeV, corresponding to integrated luminosities of 5.1 and 19.7 fb−1, respectively, increases both the expected and observed significances by 1%. The measured signal strength, relative to the SM prediction, is 1.19+0.40−0.39(stat)+0.15−0.14(syst). This result constitutes the first evidence for the decay of the Higgs boson to second generation fermions and is the most precise measurement of the Higgs boson coupling to muons reported to date. Individuals have received support from the Marie-Curie programme and the European Research Council and Horizon 2020 Grant, contract Nos. 675440, 752730, and 765710 (European Union); the Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias. CMS collaboration: et al. Peer reviewed

  • Publication . Article . Other literature type . Research . Preprint . 2020
    Open Access English
    Authors: 
    Valerie Domcke; Marco Drewes; Marco Hufnagel; Michele Lucente;
    Publisher: RWTH Aachen University
    Countries: Switzerland, Germany
    Project: EC | NewAve (638528)

    We study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly constrained by the requirement to explain the light neutrino masses, but also by experimental searches and cosmological considerations. In the existing literature, three disjoint regions of potentially viable parameter space have been identified. In one of them, all heavy neutrinos decay shortly before big bang nucleosynthesis. In the other two regions, one of the heavy neutrinos either decays between BBN and the CMB decoupling or is quasi-stable. We show that previously unaccounted constraints from photodisintegration of nuclei practically rule out all relevant decays that happen between BBN and the CMB decoupling. Quite remarkably, if all heavy neutrinos decay before BBN, the baryon asymmetry of the universe can be quite generically explained by low-scale leptogenesis, i.e. without further tuning in addition to what is needed to avoid experimental and cosmological constraints. This motivates searches for heavy neutrinos in pion decay experiments. Journal of high energy physics 01(1), 200 (2021). doi:10.1007/JHEP01(2021)200 Published by SISSA, [Trieste]

  • Publication . Article . Preprint . Other literature type . Research . Report . 2018
    Open Access English
    Authors: 
    Marko Dragicevic; Manfred Jeitler; I Kraetschmer; Jochen Schieck; Johannes Wittmann; Claudia-Elisabeth Wulz; Jasper Lauwers; Freya Blekman; Kevin Deroover; Stefaan Tavernier; +449 more
    Countries: Belgium, United States, France, Germany, Croatia, Italy, Italy, France, France, Lithuania ...
    Project: EC | AMVA4NewPhysics (675440)

    A search for charged Higgs boson decaying to a charm and a bottom quark ( $ {\mathrm{H}}^{+}\to \mathrm{c}\overline{\mathrm{b}} $ ) is performed using 19.7 fb$^{−1}$ of pp collision data at $ \sqrt{s}=8 $ TeV. The production mechanism investigated in this search is $ \mathrm{t}\overline{\mathrm{t}} $ pair production in which one top quark decays to a charged Higgs boson and a bottom quark and the other decays to a charged lepton, a neutrino, and a bottom quark. Charged Higgs boson decays to $ \mathrm{c}\overline{\mathrm{b}} $ are searched for, resulting in a final state containing at least four jets, a charged lepton (muon or electron), and missing transverse momentum. A kinematic fit is performed to identify the pair of jets least likely to be the bottom quarks originating from direct top quark decays and the invariant mass of this pair is used as the final observable in the search. No evidence for the presence of a charged Higgs boson is observed and upper limits at 95% confidence level of 0.8–0.5% are set on the branching fraction ℬ(t → H$^{+}$b), assuming ℬ(H$^{+}$ → $ \mathrm{c}\overline{\mathrm{b}} $ ) = 1.0 and ℬ(t → H$^{+}$b) + ℬ(t → Wb) = 1.0, for the charged Higgs boson mass range 90–150 GeV. Journal of high energy physics 1811(11), 115 (2018). doi:10.1007/JHEP11(2018)115 Published by Springer Nature, Cham

  • Publication . Other literature type . Article . Research . Preprint . 2021
    Open Access English
    Authors: 
    Fruehwirth, Rudolf; Wulz, Claudia-Elisabeth; Melo da Costa, Eliza; Brandao Malbouisson, Helena; Tomei, Thiago; de Moraes Gregores, Eduardo; de Souza Lemos, Dener; Garcia Fuentes, Francisco Ignacio; Agram, Jean-Laurent; Brom, Jean-Marie; +279 more
    Publisher: Elsevier
    Countries: Italy, Germany, Belgium, Italy, Turkey, Croatia, United States, Spain, Turkey, Italy ...
    Project: EC | LHCTOPVLQ (752730), EC | INSIGHTS (765710), EC | AMVA4NewPhysics (675440)

    Measurements of the second Fourier harmonic coefficient (v2) of the azimuthal distributions of prompt and nonprompt D0 mesons produced in pp and pPb collisions are presented. Nonprompt D0 mesons come from beauty hadron decays. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. In high multiplicity pp collisions, v2 signals for prompt charm hadrons are reported for the first time, and are found to be comparable to those for light-flavor hadron species over a transverse momentum (pT) range of 2–6 GeV. Compared at similar event multiplicities, the prompt D0 meson v2 values in pp and pPb collisions are similar in magnitude. The v2 values for open beauty hadrons are extracted for the first time via nonprompt D0 mesons in pPb collisions. For pT in the range of 2–5 GeV, the results suggest that v2 for nonprompt D0 mesons is smaller than that for prompt D0 mesons. These new measurements indicate a positive charm hadron v2 in pp collisions and suggest a mass dependence in v2 between charm and beauty hadrons in the pPb system. These results provide insights into the origin of heavy-flavor quark collectivity in small systems. Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, contract Nos. 675440, 752730, and 765710 (European Union); CERN; the Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias. CMS Collaboration: et al. Funded by SCOAP3. Peer reviewed

  • Open Access English
    Authors: 
    Thomas Bergauer; Marko Dragicevic; M. Flechl; Ilse Krätschmer; Dietrich Liko; Thomas Madlener; Jochen Schieck; Robert Schöfbeck; Markus Spanring; Jasper Lauwers; +413 more
    Publisher: Springer Verlag
    Countries: Germany, Germany, United Kingdom, Serbia, France, Italy, Italy, Finland, Switzerland, Italy ...
    Project: EC | AMVA4NewPhysics (675440)

    A search for the standard model Higgs boson produced in association with a W or a Z boson and decaying to a pair of τ leptons is performed. A data sample of proton-proton collisions collected at s√ = 13 TeV by the CMS experiment at the CERN LHC is used, corresponding to an integrated luminosity of 35.9 fb−1. The signal strength is measured relative to the expectation for the standard model Higgs boson, yielding μ = 2.5 − 1.3 + 1.4 . These results are combined with earlier CMS measurements targeting Higgs boson decays to a pair of τ leptons, performed with the same data set in the gluon fusion and vector boson fusion production modes. The combined signal strength is μ = 1.24 − 0.27 + 0.29 (1.00 − 0.23 + 0.24 expected), and the observed significance is 5.5 standard deviations (4.8 expected) for a Higgs boson mass of 125 GeV. Journal of High Energy Physics, 2019 (6) ISSN:1029-8479 ISSN:1126-6708

  • Publication . Article . Other literature type . Preprint . Research . 2022
    Open Access English
    Authors: 
    Tumasyan, Armen; Adam, Wolfgang; Lechner, Lukas; Hensel, Carsten; Kim, Dong Hee; Kim, Gui Nyun; Kim, Jiwoong; Lee, Jeongeun; Lee, Seh Wook; Moon, Chang-Seong; +524 more
    Publisher: SPRINGER
    Countries: Germany, Germany, France, United Kingdom, Turkey, Italy, Finland, Switzerland, United States, Germany ...
    Project: EC | AMVA4NewPhysics (675440), EC | MajorNet (758316)

    Measurements of jet substructure describing the composition of quark- and gluon-initiated jets are presented. Proton-proton (pp) collision data at √s = 13 TeV collected with the CMS detector are used, corresponding to an integrated luminosity of 35.9 fb−1. Generalized angularities are measured that characterize the jet substructure and distinguish quark- and gluon-initiated jets. These observables are sensitive to the distributions of transverse momenta and angular distances within a jet. The analysis is performed using a data sample of dijet events enriched in gluon-initiated jets, and, for the first time, a Z+jet event sample enriched in quark-initiated jets. The observables are measured in bins of jet transverse momentum, and as a function of the jet radius parameter. Each measurement is repeated applying a “soft drop” grooming procedure that removes soft and large angle radiation from the jet. Using these measurements, the ability of various models to describe jet substructure is assessed, showing a clear need for improvements in Monte Carlo generators. Journal of High Energy Physics, 2022 (1) ISSN:1029-8479 ISSN:1126-6708

  • Open Access English
    Authors: 
    Schreiner, Thomas; Kaufmann, Elisabeth; Noachtar, Soheyl; Mehrkens, Jan-Hinnerk; Staudigl, Tobias;
    Country: Germany
    Project: EC | DirectThalamus (802681)

    A hallmark of non-rapid eye movement (NREM) sleep is the coordinated interplay of slow oscillations (SOs) and sleep spindles. Traditionally, a cortico-thalamo-cortical loop is suggested to coordinate these rhythms: neocortically-generated SOs trigger spindles in the thalamus that are projected back to neocortex. Here, we used direct intrathalamic recordings from human epilepsy patients to test this canonical interplay. We show that SOs in the anterior thalamus precede neocortical SOs, whereas concurrently-recorded SOs in the mediodorsal thalamus are led by neocortical SOs. Furthermore, sleep spindles, detected in both thalamic nuclei, preceded their neocortical counterparts and were initiated during early phases of thalamic SOs. Our findings indicate an active role of the anterior thalamus in organizing the cardinal sleep rhythms in the neocortex and highlight the functional diversity of specific thalamic nuclei in humans. The concurrent coordination of sleep oscillations by the thalamus could have broad implications for the mechanisms underlying memory consolidation.

  • Open Access English
    Authors: 
    Ece Aşılar; Marko Dragicevic; Martin Flechl; Ilse Krätschmer; Thomas Madlener; Navid Rad; Jochen Schieck; Robert Schöfbeck; Wolfgang Waltenberger; Claudia-Elisabeth Wulz; +470 more
    Publisher: Springer
    Countries: France, Italy, Croatia, Belgium, Italy, Switzerland, Belgium, Portugal, United States, Italy ...
    Project: EC | AMVA4NewPhysics (675440)

    A search for the pair production of the lightest supersymmetric partner of the top quark (t~1) is presented. The search focuses on a compressed scenario where the mass difference between the top squark and the lightest supersymmetric particle, often considered to be the lightest neutralino (χ~01), is smaller than the mass of the W boson. The proton-proton collision data were recorded by the CMS experiment at a centre-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 35.9 fb−1. In this search, two decay modes of the top squark are considered: a four-body decay into a bottom quark, two additional fermions, and a χ~01; and a decay via an intermediate chargino. Events are selected using the presence of a high-momentum jet, significant missing transverse momentum, and a low transverse momentum electron or muon. Two analysis techniques are used, targeting different decay modes of the t~1: a sequential selection and a multivariate technique. No evidence for the production of top squarks is found, and mass limits at 95% confidence level are set that reach up to 560 GeV, depending on the m(t~1)−m(χ~01) mass difference and the decay mode. Journal of High Energy Physics, 2018 (9) ISSN:1029-8479 ISSN:1126-6708

  • Publication . Research . 2009
    Open Access German
    Authors: 
    Kotowski, Jakub; Stroka, Stephanie; Bry, François; Schaffert, Sebastian;
    Country: Germany
    Project: EC | KIWI (211932)

    KiWi is a framework for semantic social software applica- tions that combines the Wiki philosophy with Semantic Web technolo- gies. Applications based on KiWi can therefore leverage i.a. reasoning and versioning to follow both aspects and even go beyond existing tech- nologies. For example, KiWi allows composition of content items, which poses a challenge to the versioning system. In this paper we discuss ver- sioning of composed content items and challenges related to reasoning in collaborative social software, as both topics are concerned with updates on the application state.

  • Publication . Article . Preprint . Research . Other literature type . 2020
    Open Access English
    Authors: 
    Thomas Bergauer; Marko Dragicevic; A. Escalante Del Valle; Jochen Schieck; Wolfgang Waltenberger; Freya Blekman; Emil Sørensen Bols; Stefaan Tavernier; Barbara Clerbaux; Amandeep Kaur Kalsi; +492 more
    Publisher: Springer
    Countries: United States, Italy, Belgium, Germany, Belgium, Italy, Italy, Italy, Serbia, Spain ...
    Project: EC | LHCTOPVLQ (752730), EC | AMVA4NewPhysics (675440), EC | INSIGHTS (765710)

    Decays of the 125 GeV Higgs boson into a Z boson and a ρ0(770) or ϕ(1020) meson are searched for using proton-proton collision data collected by the CMS experiment at the LHC at s√ = 13 TeV. The analysed data set corresponds to an integrated luminosity of 137 fb−1. Events are selected in which the Z boson decays into a pair of electrons or a pair of muons, and the ρ and ϕ mesons decay into pairs of pions and kaons, respectively. No significant excess above the background model is observed. As different polarization states are possible for the decay products of the Z boson and ρ or ϕ mesons, affecting the signal acceptance, scenarios in which the decays are longitudinally or transversely polarized are considered. Upper limits at the 95% confidence level on the Higgs boson branching fractions into Zρ and Zϕ are determined to be 1.04–1.31% and 0.31–0.40%, respectively, where the ranges reflect the considered polarization scenarios; these values are 740–940 and 730–950 times larger than the respective standard model expectations. These results constitute the first experimental limits on the two decay channels. Individuals have received support from the Marie-Curie programme and the European Research Council and Horizon 2020 Grant, contract Nos. 675440, 752730, and 765710 (European Union); the Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias. Article funded by SCOAP3. CMS collaboration: et al. Peer reviewed

Advanced search in
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Any field
arrow_drop_down
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Include:
568 Research products, page 1 of 57
  • Publication . Article . Other literature type . Research . Preprint . 2021
    Open Access
    Authors: 
    Ayse Polatoz; Willard Johns; Sinan Sagir; Soureek Mitra; Michael Tytgat; Ram Krishna Dewanjee; Austin Baty; Graham Wilson; Attilio Santocchia; Erhan Gülmez; +552 more
    Countries: United Kingdom, Spain, Italy, Croatia, Serbia, United States, Turkey, Italy, France, Croatia ...
    Project: EC | AMVA4NewPhysics (675440), EC | INSIGHTS (765710), EC | LHCTOPVLQ (752730)

    Evidence for Higgs boson decay to a pair of muons is presented. This result combines searches in four exclusive categories targeting the production of the Higgs boson via gluon fusion, via vector boson fusion, in association with a vector boson, and in association with a top quark-antiquark pair. The analysis is performed using proton-proton collision data at s√ = 13 TeV, corresponding to an integrated luminosity of 137 fb−1, recorded by the CMS experiment at the CERN LHC. An excess of events over the back- ground expectation is observed in data with a significance of 3.0 standard deviations, where the expectation for the standard model (SM) Higgs boson with mass of 125.38 GeV is 2.5. The combination of this result with that from data recorded at s√ = 7 and 8 TeV, corresponding to integrated luminosities of 5.1 and 19.7 fb−1, respectively, increases both the expected and observed significances by 1%. The measured signal strength, relative to the SM prediction, is 1.19+0.40−0.39(stat)+0.15−0.14(syst). This result constitutes the first evidence for the decay of the Higgs boson to second generation fermions and is the most precise measurement of the Higgs boson coupling to muons reported to date. Individuals have received support from the Marie-Curie programme and the European Research Council and Horizon 2020 Grant, contract Nos. 675440, 752730, and 765710 (European Union); the Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias. CMS collaboration: et al. Peer reviewed

  • Publication . Article . Other literature type . Research . Preprint . 2020
    Open Access English
    Authors: 
    Valerie Domcke; Marco Drewes; Marco Hufnagel; Michele Lucente;
    Publisher: RWTH Aachen University
    Countries: Switzerland, Germany
    Project: EC | NewAve (638528)

    We study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly constrained by the requirement to explain the light neutrino masses, but also by experimental searches and cosmological considerations. In the existing literature, three disjoint regions of potentially viable parameter space have been identified. In one of them, all heavy neutrinos decay shortly before big bang nucleosynthesis. In the other two regions, one of the heavy neutrinos either decays between BBN and the CMB decoupling or is quasi-stable. We show that previously unaccounted constraints from photodisintegration of nuclei practically rule out all relevant decays that happen between BBN and the CMB decoupling. Quite remarkably, if all heavy neutrinos decay before BBN, the baryon asymmetry of the universe can be quite generically explained by low-scale leptogenesis, i.e. without further tuning in addition to what is needed to avoid experimental and cosmological constraints. This motivates searches for heavy neutrinos in pion decay experiments. Journal of high energy physics 01(1), 200 (2021). doi:10.1007/JHEP01(2021)200 Published by SISSA, [Trieste]

  • Publication . Article . Preprint . Other literature type . Research . Report . 2018
    Open Access English
    Authors: 
    Marko Dragicevic; Manfred Jeitler; I Kraetschmer; Jochen Schieck; Johannes Wittmann; Claudia-Elisabeth Wulz; Jasper Lauwers; Freya Blekman; Kevin Deroover; Stefaan Tavernier; +449 more
    Countries: Belgium, United States, France, Germany, Croatia, Italy, Italy, France, France, Lithuania ...
    Project: EC | AMVA4NewPhysics (675440)

    A search for charged Higgs boson decaying to a charm and a bottom quark ( $ {\mathrm{H}}^{+}\to \mathrm{c}\overline{\mathrm{b}} $ ) is performed using 19.7 fb$^{−1}$ of pp collision data at $ \sqrt{s}=8 $ TeV. The production mechanism investigated in this search is $ \mathrm{t}\overline{\mathrm{t}} $ pair production in which one top quark decays to a charged Higgs boson and a bottom quark and the other decays to a charged lepton, a neutrino, and a bottom quark. Charged Higgs boson decays to $ \mathrm{c}\overline{\mathrm{b}} $ are searched for, resulting in a final state containing at least four jets, a charged lepton (muon or electron), and missing transverse momentum. A kinematic fit is performed to identify the pair of jets least likely to be the bottom quarks originating from direct top quark decays and the invariant mass of this pair is used as the final observable in the search. No evidence for the presence of a charged Higgs boson is observed and upper limits at 95% confidence level of 0.8–0.5% are set on the branching fraction ℬ(t → H$^{+}$b), assuming ℬ(H$^{+}$ → $ \mathrm{c}\overline{\mathrm{b}} $ ) = 1.0 and ℬ(t → H$^{+}$b) + ℬ(t → Wb) = 1.0, for the charged Higgs boson mass range 90–150 GeV. Journal of high energy physics 1811(11), 115 (2018). doi:10.1007/JHEP11(2018)115 Published by Springer Nature, Cham

  • Publication . Other literature type . Article . Research . Preprint . 2021
    Open Access English
    Authors: 
    Fruehwirth, Rudolf; Wulz, Claudia-Elisabeth; Melo da Costa, Eliza; Brandao Malbouisson, Helena; Tomei, Thiago; de Moraes Gregores, Eduardo; de Souza Lemos, Dener; Garcia Fuentes, Francisco Ignacio; Agram, Jean-Laurent; Brom, Jean-Marie; +279 more
    Publisher: Elsevier
    Countries: Italy, Germany, Belgium, Italy, Turkey, Croatia, United States, Spain, Turkey, Italy ...
    Project: EC | LHCTOPVLQ (752730), EC | INSIGHTS (765710), EC | AMVA4NewPhysics (675440)

    Measurements of the second Fourier harmonic coefficient (v2) of the azimuthal distributions of prompt and nonprompt D0 mesons produced in pp and pPb collisions are presented. Nonprompt D0 mesons come from beauty hadron decays. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. In high multiplicity pp collisions, v2 signals for prompt charm hadrons are reported for the first time, and are found to be comparable to those for light-flavor hadron species over a transverse momentum (pT) range of 2–6 GeV. Compared at similar event multiplicities, the prompt D0 meson v2 values in pp and pPb collisions are similar in magnitude. The v2 values for open beauty hadrons are extracted for the first time via nonprompt D0 mesons in pPb collisions. For pT in the range of 2–5 GeV, the results suggest that v2 for nonprompt D0 mesons is smaller than that for prompt D0 mesons. These new measurements indicate a positive charm hadron v2 in pp collisions and suggest a mass dependence in v2 between charm and beauty hadrons in the pPb system. These results provide insights into the origin of heavy-flavor quark collectivity in small systems. Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, contract Nos. 675440, 752730, and 765710 (European Union); CERN; the Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia María de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias. CMS Collaboration: et al. Funded by SCOAP3. Peer reviewed

  • Open Access English
    Authors: 
    Thomas Bergauer; Marko Dragicevic; M. Flechl; Ilse Krätschmer; Dietrich Liko; Thomas Madlener; Jochen Schieck; Robert Schöfbeck; Markus Spanring; Jasper Lauwers; +413 more
    Publisher: Springer Verlag
    Countries: Germany, Germany, United Kingdom, Serbia, France, Italy, Italy, Finland, Switzerland, Italy ...
    Project: EC | AMVA4NewPhysics (675440)

    A search for the standard model Higgs boson produced in association with a W or a Z boson and decaying to a pair of τ leptons is performed. A data sample of proton-proton collisions collected at s√ = 13 TeV by the CMS experiment at the CERN LHC is used, corresponding to an integrated luminosity of 35.9 fb−1. The signal strength is measured relative to the expectation for the standard model Higgs boson, yielding μ = 2.5 − 1.3 + 1.4 . These results are combined with earlier CMS measurements targeting Higgs boson decays to a pair of τ leptons, performed with the same data set in the gluon fusion and vector boson fusion production modes. The combined signal strength is μ = 1.24 − 0.27 + 0.29 (1.00 − 0.23 + 0.24 expected), and the observed significance is 5.5 standard deviations (4.8 expected) for a Higgs boson mass of 125 GeV. Journal of High Energy Physics, 2019 (6) ISSN:1029-8479 ISSN:1126-6708

  • Publication . Article . Other literature type . Preprint . Research . 2022
    Open Access English
    Authors: 
    Tumasyan, Armen; Adam, Wolfgang; Lechner, Lukas; Hensel, Carsten; Kim, Dong Hee; Kim, Gui Nyun; Kim, Jiwoong; Lee, Jeongeun; Lee, Seh Wook; Moon, Chang-Seong; +524 more
    Publisher: SPRINGER
    Countries: Germany, Germany, France, United Kingdom, Turkey, Italy, Finland, Switzerland, United States, Germany ...
    Project: EC | AMVA4NewPhysics (675440), EC | MajorNet (758316)

    Measurements of jet substructure describing the composition of quark- and gluon-initiated jets are presented. Proton-proton (pp) collision data at √s = 13 TeV collected with the CMS detector are used, corresponding to an integrated luminosity of 35.9 fb−1. Generalized angularities are measured that characterize the jet substructure and distinguish quark- and gluon-initiated jets. These observables are sensitive to the distributions of transverse momenta and angular distances within a jet. The analysis is performed using a data sample of dijet events enriched in gluon-initiated jets, and, for the first time, a Z+jet event sample enriched in quark-initiated jets. The observables are measured in bins of jet transverse momentum, and as a function of the jet radius parameter. Each measurement is repeated applying a “soft drop” grooming procedure that removes soft and large angle radiation from the jet. Using these measurements, the ability of various models to describe jet substructure is assessed, showing a clear need for improvements in Monte Carlo generators. Journal of High Energy Physics, 2022 (1) ISSN:1029-8479 ISSN:1126-6708

  • Open Access English
    Authors: 
    Schreiner, Thomas; Kaufmann, Elisabeth; Noachtar, Soheyl; Mehrkens, Jan-Hinnerk; Staudigl, Tobias;
    Country: Germany
    Project: EC | DirectThalamus (802681)

    A hallmark of non-rapid eye movement (NREM) sleep is the coordinated interplay of slow oscillations (SOs) and sleep spindles. Traditionally, a cortico-thalamo-cortical loop is suggested to coordinate these rhythms: neocortically-generated SOs trigger spindles in the thalamus that are projected back to neocortex. Here, we used direct intrathalamic recordings from human epilepsy patients to test this canonical interplay. We show that SOs in the anterior thalamus precede neocortical SOs, whereas concurrently-recorded SOs in the mediodorsal thalamus are led by neocortical SOs. Furthermore, sleep spindles, detected in both thalamic nuclei, preceded their neocortical counterparts and were initiated during early phases of thalamic SOs. Our findings indicate an active role of the anterior thalamus in organizing the cardinal sleep rhythms in the neocortex and highlight the functional diversity of specific thalamic nuclei in humans. The concurrent coordination of sleep oscillations by the thalamus could have broad implications for the mechanisms underlying memory consolidation.

  • Open Access English
    Authors: 
    Ece Aşılar; Marko Dragicevic; Martin Flechl; Ilse Krätschmer; Thomas Madlener; Navid Rad; Jochen Schieck; Robert Schöfbeck; Wolfgang Waltenberger; Claudia-Elisabeth Wulz; +470 more
    Publisher: Springer
    Countries: France, Italy, Croatia, Belgium, Italy, Switzerland, Belgium, Portugal, United States, Italy ...
    Project: EC | AMVA4NewPhysics (675440)

    A search for the pair production of the lightest supersymmetric partner of the top quark (t~1) is presented. The search focuses on a compressed scenario where the mass difference between the top squark and the lightest supersymmetric particle, often considered to be the lightest neutralino (χ~01), is smaller than the mass of the W boson. The proton-proton collision data were recorded by the CMS experiment at a centre-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 35.9 fb−1. In this search, two decay modes of the top squark are considered: a four-body decay into a bottom quark, two additional fermions, and a χ~01; and a decay via an intermediate chargino. Events are selected using the presence of a high-momentum jet, significant missing transverse momentum, and a low transverse momentum electron or muon. Two analysis techniques are used, targeting different decay modes of the t~1: a sequential selection and a multivariate technique. No evidence for the production of top squarks is found, and mass limits at 95% confidence level are set that reach up to 560 GeV, depending on the m(t~1)−m(χ~01) mass difference and the decay mode. Journal of High Energy Physics, 2018 (9) ISSN:1029-8479 ISSN:1126-6708

  • Publication . Research . 2009
    Open Access German
    Authors: 
    Kotowski, Jakub; Stroka, Stephanie; Bry, François; Schaffert, Sebastian;
    Country: Germany
    Project: EC | KIWI (211932)

    KiWi is a framework for semantic social software applica- tions that combines the Wiki philosophy with Semantic Web technolo- gies. Applications based on KiWi can therefore leverage i.a. reasoning and versioning to follow both aspects and even go beyond existing tech- nologies. For example, KiWi allows composition of content items, which poses a challenge to the versioning system. In this paper we discuss ver- sioning of composed content items and challenges related to reasoning in collaborative social software, as both topics are concerned with updates on the application state.

  • Publication . Article . Preprint . Research . Other literature type . 2020
    Open Access English
    Authors:&n