24 research outputs found

    Search for the bcb_c meson in hadronic Z decays

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    A search for the Bc meson decaying into the channels J/psi pi+ and J/psi l nu (l = e or mu) is performed in a sample of 3.9 million hadronic Z decays collected by the ALEPH detector. This search results in the observation of 0 and 2 candidates in each of these channels, respectively, while 0.44 and 0.81 background events are expected. The following 90\% confidence level upper limits are derived: Br(Z->Bc X)/Br(Z->q q )*Br(Bc->J/psi pi+) 3.6 10^-5 Br(Z->Bc X)/Br(Z->q q )*Br(Bc->J/psi l nu) 5.2 10^-5 An additional Bc->J/psi(e+e-) mu nu candidate with very low background probability, found in an independent analysis, is also described in detail

    Study of muon-pair production at centre-of-mass energies from 20 to 136 GeV with the Aleph detector

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    The total cross section and the forward-backward asymmetry for the process e+e−→Ό+Ό−(nÎł)e^+ e^- \rightarrow \mu^+ \mu^- (n \gamma) are measured in the energy range 20-136 GeV by reconstructing the effective centre-of-mass energy after initial state radiation. The analysis is based on the data recorded with the ALEPH detector at LEP between 1990 and 1995, corresponding to a total integrated luminosity of 143.5 pb−1\mathrm{pb}^{-1}. Two different approaches are used: in the first one an exclusive selection of events with hard initial state radiation in the energy range 20-88 GeV is directly compared with the Standard Model predictions showing good agreement. In the second one, all events are used to obtain a precise measurement of the energy dependence of σ0\sigma^0 and AFB0A_{\mathrm{FB}}^0 from a model independent fit, enabling constraints to be placed on models with extra Z bosons

    Identification of boosted Higgs bosons decaying into b-quark pairs with the ATLAS detector at 13 TeV

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    This paper describes a study of techniques for identifying Higgs bosons at high transverse momenta decaying into bottom-quark pairs, H→bb¯ , for proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy s√=13 TeV . These decays are reconstructed from calorimeter jets found with the anti- kt R=1.0 jet algorithm. To tag Higgs bosons, a combination of requirements is used: b-tagging of R=0.2 track-jets matched to the large-R calorimeter jet, and requirements on the jet mass and other jet substructure variables. The Higgs boson tagging efficiency and corresponding multijet and hadronic top-quark background rejections are evaluated using Monte Carlo simulation. Several benchmark tagging selections are defined for different signal efficiency targets. The modelling of the relevant input distributions used to tag Higgs bosons is studied in 36 fb −1 of data collected in 2015 and 2016 using g→bb¯ and Z(→bb¯)γ event selections in data. Both processes are found to be well modelled within the statistical and systematic uncertainties

    Dijet azimuthal correlations and conditional yields in pp and p plus Pb collisions at √{S}^NN=5.02 TeV with the ATLAS detector

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    This paper presents a measurement of forward-forward and forward-central dijet azimuthal angular correlations and conditional yields in proton-proton (pp) and proton-lead (p + Pb) collisions as a probe of the nuclear gluon density in regions where the fraction of the average momentum per nucleon carried by the parton entering the hard scattering is low. In these regions, gluon saturation can modify the rapidly increasing parton distribution function of the gluon. The analysis utilizes 25 pb^{-1} of pp data and 360 mp^{-1} of p + Pb data, both at {S}^NN=5.02 TeV, collected in 2015 and 2016, respectively, with the ATLAS detector at the Large Hadron Collider. The measurement is performed in the center-of-mass frame of the nucleon-nucleon system in the rapidity range between -4.0 and 4.0 using the two highest transverse-momentum jets in each event, with the highest transverse-momentum jet restricted to the forward rapidity range. No significant broadening of azimuthal angular correlations is observed for forward-forward or forward-central dijets in p + Pb compared to pp collisions. For forward-forward jet pairs in the proton-going direction, the ratio of conditional yields in p + Pb collisions to those in pp collisions is suppressed by approximately 20%, with no significant dependence on the transverse momentum of the dijet system. No modification of conditional yields is observed for forward-central dijets

    A search for rare B meson decays at the CERN Spp‟\overline{p}S collider

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    First observation of the beauty baryon Λb\Lambda_{b} in the decay channel Λb→\Lambda_{b} \rightarrow J/ψΛ\psi\Lambda at the CERN proton-antiproton collider

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    Limits on t-quark decay into charged Higgs from a direct search at the CERN pp‟\overline{p} collider

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    J/ψ\psi and ψ\psi' production at the CERN pp‟\overline{p} collider

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    Measurement of the ratio Râ‰ĄÏƒWR \equiv \sigma_{W}Br(W →ΌΜ\to \mu\nu)/ σZ\sigma_{Z}Br(Z \to ΌΌ\mu\mu) and ΓWtot\Gamma^{tot}_{W} at the CERN proton-antiproton collider

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    Measurement of the ratio Râ‰ĄÏƒWR \equiv \sigma_{W}Br(W →ΌΜ\to \mu\nu)/ σZ\sigma_{Z}Br(Z \to ΌΌ\mu\mu) and ΓWtot\Gamma^{tot}_{W} at the CERN proton-antiproton collider

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