16 research outputs found

    Search for neutral resonances decaying into a Z boson and a pair of b jets or τ leptons

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    A search is performed for a new resonance decaying into a lighter resonance and a Z boson. Two channels are studied, targeting the decay of the lighter resonance into either a pair of oppositely charged τ leptons or a bb‾ pair. The Z boson is identified via its decays to electrons or muons. The search exploits data collected by the CMS experiment at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.8 fb −1 . No significant deviations are observed from the standard model expectation and limits are set on production cross sections and parameters of two-Higgs-doublet models

    Search for R-parity violating decays of a top squark in proton–proton collisions at √s=8 TeV

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    The results of a search for a supersymmetric partner of the top quark (top squark), pair-produced in proton–proton collisions at View the MathML sources=8 TeV, are presented. The search, which focuses on R-parity violating, chargino-mediated decays of the top squark, is performed in final states with low missing transverse momentum, two oppositely charged electrons or muons, and at least five jets. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb−1 collected with the CMS detector at the LHC in 2012. The data are found to be in agreement with the standard model expectation, and upper limits are placed on the top squark pair production cross section at 95% confidence level. Assuming a 100% branching fraction for the top squark decay chain, View the MathML sourcet˜→tχ˜1±,χ˜1±→ℓ±+jj, top squark masses less than 890 (1000) GeV for the electron (muon) channel are excluded for the first time in models with a single nonzero R-parity violating coupling View the MathML sourceλijk′(i,j,k≤2)(i,j,k≤2), where i,j,ki,j,k correspond to the three generations

    Search for Narrow Resonances Decaying to Dijets in Proton-Proton Collisions at root s=13 TeV

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    Peer reviewe

    Correlations between jets and charged particles in PbPb and pp collisions at root s(NN)=2.76 TeV

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    Peer reviewe

    Measurement of the Zγ→νν‾γ production cross section in pp collisions at s=8 TeV and limits on anomalous ZZγ and Zγγ trilinear gauge boson couplings

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    An inclusive measurement of the Zγ→νν‾γ production cross section in pp collisions at s=8TeV is presented, using data corresponding to an integrated luminosity of 19.6 fb −1 collected with the CMS detector at the LHC. This measurement is based on the observation of events with large missing energy and with a single photon with transverse momentum above 145 GeV and absolute pseudorapidity in the range |η|<1.44 . The measured Zγ→νν‾γ production cross section, 52.7±2.1 (stat)±6.4 (syst)±1.4 (lumi) fb , agrees well with the standard model prediction of 50.0−2.2+2.4 fb . A study of the photon transverse momentum spectrum yields the most stringent limits to date on the anomalous ZZγ and Zγγ trilinear gauge boson couplings

    The future of religious education in Europe

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    This E-book is the result of a workshop on “The future of religious education in Europe”, hosted by the Robert Schuman Centre for Advanced Studies at the European University Institute in Florence on 28 October 2014.This small volume covers the entire conceptual range of approaches to religious education in public schools. The papers gathered in this publication cover the conceptual debate on the subject, ranging from a confessional approach to a sociological approach with an inclusive model as the middle-position. The different models diverge on how they define, in the context of public schooling for children aged 6 to 14 years, what religious education is aimed at: is that what should be conveyed knowledge about religion or instead religious knowledge? Should pupils become cognitively equipped to recognize and discuss religious diversity, or should they first become literate in one, presumably “their own” religious tradition?-- I Kristina Stoeckl – Knowledge about religion and religious knowledge in secular societies: introductory remarks to The future of religious education in Europe -- II Robert Jackson – Inclusive Study of Religions and other Worldviews in Publicly-funded Schools in Democratic Societies -- III Valeria Fabretti – Rethinking Religious Education sociologically: A contribution to the European debate and comparison -- IV Joachim Willems – Religious Education and the Student’s Fundamental Right to Freedom of Religion – Some Lessons and Questions from Germany -- V Matthias Scharer, Innsbruck – “Learning Religion” in the Presence of the Other: Provocation and Gift in Public Educatio

    Racial cues and attitudes toward redistribution : a comparative experimental approach

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    Support for welfare in the US is heavily influenced by citizens’ racial attitudes, especially citizens’ attitudes toward Blacks. Indeed, the fact that many Americans think of welfare recipients as poor Blacks (and especially poor Black women) is a common explanation for Americans’ comparatively low support for redistribution cross-nationally. In this study, we extend existing work on how racialized portrayals of recipients affect attitudes toward redistribution. The data for the analysis are drawn from a new and unique online survey experiment, implemented by YouGov with representative samples (n=1200) in each of the US, UK and Canada. Relying on a series of survey vignettes, we manipulate program type (welfare vs. unemployment insurance) as well as the ethno-racial background of recipients (through morphed photos and common ethnicized names). In doing so, we seek to make three specific contributions. First, we test whether support for a means-tested program like welfare is lower than support for contribution-based program like unemployment insurance. Second, we extend the American literature to explore whether there is an anti-Black bias in other countries. Third, we examine whether citizens respond to other minority groups (Asians and Southeast Asians) in a similar manner. Parallel survey designs allows for an unprecedented comparative analysis of the underlying political-psychological sources of support (or lack of support) for redistributive policies across Anglo-Saxon democracies. The paper concludes by considering the implications of this study in light of growing immigrant-driven diversity in North America and Europe

    Measurement of the tbartt bar{t} Production Cross Section in pbarpp bar{p} collisions at sqrtssqrt{s} = 1.96-TeV using Lepton + Jets Events with Jet Probability bb^- tagging

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    Erratum to: Search for direct pair production of scalar top quarks in the single- and dilepton channels in proton-proton collisions at root S = 8 TeV (vol 07, 027, 2016)

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    Made available in DSpace on 2017-08-17T19:11:24Z (GMT). No. of bitstreams: 1 2-s2.0-84987936753.pdf: 291793 bytes, checksum: 3c7481160ef6cd3aabba0d0729f5bd6c (MD5) Previous issue date: 20162016

    Measurement of dijet azimuthal decorrelation in pp collisions at √s=8TeV

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    A measurement of the decorrelation of azimuthal angles between the two jets with the largest transverse momenta is presented for seven regions of leading jet transverse momentum up to 2.2TeV. The analysis is based on the proton-proton collision data collected with the CMS experiment at a centre-of-mass energy of 8TeV corresponding to an integrated luminosity of 19.7fb-1. The dijet azimuthal decorrelation is caused by the radiation of additional jets and probes the dynamics of multijet production. The results are compared to fixed-order predictions of perturbative quantum chromodynamics (QCD), and to simulations using Monte Carlo event generators that include parton showers, hadronization, and multiparton interactions. Event generators with only two outgoing high transverse momentum partons fail to describe the measurement, even when supplemented with next-to-leading-order QCD corrections and parton showers. Much better agreement is achieved when at least three outgoing partons are complemented through either next-to-leading-order predictions or parton showers. This observation emphasizes the need to improve predictions for multijet production. © 2016, CERN for the benefit of the CMS collaboration
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