93 research outputs found

    FLUKA as a new high energy cosmic ray generator

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    FLUKA is a multipurpose Monte Carlo code, which can transport particles over a wide range of energies in user-defined geometries. Here we present a new FLUKA library, which allows the interaction and propagation of high energy cosmic rays in the Earth atmosphere and the transport of high energy muons in underground/underwater environmentsComment: Presented by A.Margiotta at the Very Large Volume neutrino Telescope Workshop 2009 - VLVnT09, Athens, October 2009. 3 pages, 1 figure. To be published in NIM

    Measurement of four-jet differential cross sections in s = 8 s=8 \sqrt{s}=8 TeV proton-proton collisions using the ATLAS detector

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    Differential cross sections for the production of at least four jets have been measured in proton-proton collisions at s√=8 TeV at the Large Hadron Collider using the ATLAS detector. Events are selected if the four anti-ktR = 0.4 jets with the largest transverse momentum (pT) within the rapidity range |y| < 2.8 are well separated (ΔR4jmin > 0.65), all have pT > 64 GeV, and include at least one jet with pT > 100 GeV. The dataset corresponds to an integrated luminosity of 20.3 fb−1. The cross sections, corrected for detector effects, are compared to leading-order and next-to-leading-order calculations as a function of the jet momenta, invariant masses, minimum and maximum opening angles and other kinematic variables

    Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

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    A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements

    Search for new phenomena in different-flavour high-mass dilepton final states in pp collisions at √s = 13 TeV with the ATLAS detector

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    A search is performed for a heavy particle decaying into different flavour dilepton pairs (eµ, eτ or µτ), using 3.2 fb−1 of proton–proton collision data at √s = 13 TeV collected in 2015 by the ATLAS detector at the Large Hadron Collider. No excess over the Standard Model prediction is observed. Limits at the 95% credibility level are set on the mass of a Z 0 boson with lepton-flavour-violating couplings at 3.0, 2.7 and 2.6 TeV, and on the mass of a supersymmetric τ sneutrino with R-parity-violating couplings at 2.3, 2.2 and 1.9 TeV, for eµ, eτ and µτ final states, respectively. The results are also interpreted as limits on thethreshold mass for quantum black hole production

    Search for strong gravity in multijet final states produced in pp collisions at √s = 13 TeV using the ATLAS detector at the LHC

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    A search is conducted for new physics in multijet final states using 3.6 inverse femtobarns of data from proton-proton collisions at s\sqrt{s} = 13 TeV taken at the CERN Large Hadron Collider with the ATLAS detector. Events are selected containing at least three jets with scalar sum of jet transverse momenta (HTH_T) greater than 1 TeV. No excess is seen at large HTH_T and limits are presented on new physics: models which produce final states containing at least three jets and having cross sections larger than 1.6 fb with HTH_T > 5.8 TeV are excluded. Limits are also given in terms of new physics models of strong gravity that hypothesize additional space-time dimensions

    Search for new phenomena in final states with large jet multiplicities and missing transverse momentum with ATLAS using √ s = 13 TeV proton–proton collisions

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    Results are reported of a search for new phenomena, such as supersymmetric particle production,that could be observed in high-energy proton–proton collisions. Events with large numbers of jets, together with missing transverse momentum from unobserved particles, are selected. The data analysed were recorded by the ATLAS experiment during 2015 using the 13 TeV centre-of-mass proton–proton collisions at the Large Hadron Collider, and correspond to an integrated luminosity of 3.2 fb−1. The search selected events with variousjet multiplicities from ≥ 7 to ≥ 10 jets, and with various b-jet multiplicity requirements to enhance sensitivity. No excess above Standard Model expectations is observed. The results are interpreted within two supersymmetry models, where gluino masses up to 1400 GeV are excluded at 95% confidence level, significantly extending previous limits

    A measurement of material in the ATLAS tracker using secondary hadronic interactions in 7 TeV<i> pp</i> collisions

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    Knowledge of the material in the ATLAS inner tracking detector is crucial in understanding the reconstruction of charged-particle tracks, the performance of algorithms that identify jets containing b-hadrons and is also essential to reduce background in searches for exotic particles that can decay within the inner detector volume. Interactions of primary hadrons produced in pp collisions with the material in the inner detector are used to map the location and amount of this material. The hadronic interactions of primary particles may result in secondary vertices, which in this analysis are reconstructed by an inclusive vertex-finding algorithm. Data were collected using minimum-bias triggers by the ATLAS detector operating at the LHC during 2010 at centre-of-mass energy √s = 7 TeV, and correspond to an integratedluminosity of 19 nb−1. Kinematic properties of these secondary vertices are used to study the validity of the modelling of hadronic interactions in simulation. Secondary-vertex yields are compared between data and simulation over a volume of about 0.7 m3around the interaction point, and agreement is found within overall uncertainties

    Measurements of fiducial cross-sections for ttˉt\bar{t} t t ¯ production with one or two additional b-jets in pp collisions at s\sqrt{s} s =8 TeV using the ATLAS detector

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    Fiducial cross-sections for tt¯ production with one or two additional b-jets are reported, using an integrated luminosity of 20.3 fb −1−1 of proton–proton collisions at a centre-of-mass energy of 8 TeV at the Large Hadron Collider, collected with the ATLAS detector. The cross-section times branching ratio for tt¯ events with at least one additional b-jet is measured to be 950 ±± 70 (stat.) +240−190−190+240 (syst.) fb in the lepton-plus-jets channel and 50 ±± 10 (stat.) +15−10−10+15 (syst.) fb in the eμeμ channel. The cross-section times branching ratio for events with at least two additional b-jets is measured to be 19.3 ±± 3.5 (stat.) ±± 5.7 (syst.) fb in the dilepton channel ( eμeμ , μμμμ , and ee) using a method based on tight selection criteria, and 13.5 ±± 3.3 (stat.) ±± 3.6 (syst.) fb using a looser selection that allows the background normalisation to be extracted from data. The latter method also measures a value of 1.30 ±± 0.33 (stat.) ±± 0.28 (syst.)% for the ratio of tt¯ production with two additional b-jets to tt¯ production with any two additional jets. All measurements are in good agreement with recent theory predictions

    A search for an excited muon decaying to a muon and two jets in pp collisions at √s = 8 TeV with the ATLAS detector