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1.
  • Aaboud, M, et al. (författare)
  • Measurement of exclusive γγ →w+W- production and search for exclusive Higgs boson production in pp collisions at s =8 TeV using the ATLAS detector
  • 2016
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 94:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Searches for exclusively produced W boson pairs in the process pp(γγ)→pW+W-p and an exclusively produced Higgs boson in the process pp(gg)→pHp have been performed using e±μ final states. These measurements use 20.2 fb-1 of pp collisions collected by the ATLAS experiment at a center-of-mass energy s=8 TeV at the LHC. Exclusive production of W+W- consistent with the Standard Model prediction is found with 3.0σ significance. The exclusive W+W- production cross section is determined to be σ(γγ→W+W-→e±μX)=6.9±2.2(stat)±1.4(sys) fb, in agreement with the Standard Model prediction. Limits on anomalous quartic gauge couplings are set at 95% confidence level as -1.7×10-6&lt;a0W/Λ2&lt;1.7×10-6 GeV-2 and -6.4×10-6&lt;aCW/Λ2&lt;6.3×10-6 GeV-2. A 95% confidence-level upper limit on the total production cross section for an exclusive Higgs boson is set to 1.2 pb.</p>
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2.
  • Aaboud, M., et al. (författare)
  • Measurement of top quark pair differential cross sections in the dilepton channel in pp collisions at root s=7 and 8 TeV with ATLAS
  • 2017
  • Ingår i: Physical Review D. - Springer. - 1550-7998 .- 1550-2368. ; 94:9
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Measurements of normalized differential cross sections of top quark pair (t (t) over bar) production are presented as a function of the mass, the transverse momentum and the rapidity of the t (t) over bar system in proton-proton collisions at center-of-mass energies of root s = 7 and 8 TeV. The data set corresponds to an integrated luminosity of 4.6 fb(-1) at 7 TeV and 20.2 fb(-1) at 8 TeV, recorded with the ATLAS detector at the Large Hadron Collider. Events with top quark pair signatures are selected in the dilepton final state, requiring exactly two charged leptons and at least two jets with at least one of the jets identified as likely to contain a b hadron. The measured distributions are corrected for detector effects and selection efficiency to cross sections at the parton level. The differential cross sections are compared with different Monte Carlo generators and theoretical calculations of t (t) over bar production. The results are consistent with the majority of predictions in a wide kinematic range.</p>
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3.
  • Aaboud, M., et al. (författare)
  • Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at s =13 TeV using the ATLAS detector
  • 2016
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 94:3
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses proton-proton collision data corresponding to an integrated luminosity of 3.2 fb-1 at s=13 TeV collected in 2015 with the ATLAS detector at the Large Hadron Collider. Events are required to have at least one jet with a transverse momentum above 250 GeV and no leptons. Several signal regions are considered with increasing missing-transverse-momentum requirements between ETmiss&gt;250 GeV and ETmiss&gt;700 GeV. Good agreement is observed between the number of events in data and Standard Model predictions. The results are translated into exclusion limits in models with large extra spatial dimensions, pair production of weakly interacting dark-matter candidates, and the production of supersymmetric particles in several compressed scenarios.</p>
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4.
  • Aaboud, M., et al. (författare)
  • Study of ordered hadron chains with the ATLAS detector
  • 2017
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 96
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The analysis of the momentum difference between charged hadrons in high-energy proton-proton collisions is performed in order to study coherent particle production. The observed correlation pattern agrees with a model of a helical QCD string fragmenting into a chain of ground-state hadrons. A threshold momentum difference in the production of adjacent pairs of charged hadrons is observed, in agreement with model predictions. The presence of low-mass hadron chains also explains the emergence of charge-combination-dependent two-particle correlations commonly attributed to Bose-Einstein interference. The data sample consists of 190  μb−1 of minimum-bias events collected with proton-proton collisions at a center-of-mass energy √s=7  TeV in the early low-luminosity data taking with the ATLAS detector at the LHC.</p>
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5.
  • Aad, G., et al. (författare)
  • ATLAS measurements of the properties of jets for boosted particle searches
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 86:7, s. 072006
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Measurements are presented of the properties of high transverse momentum jets, produced in proton-proton collisions at a center-of-mass energy of root s = 7 TeV. The data correspond to an integrated luminosity of 35 pb(-1) and were collected with the ATLAS detector in 2010. Jet mass, width, eccentricity, planar flow and angularity are measured for jets reconstructed using the anti-k(t) algorithm with distance parameters R 0: 6 and 1.0, with transverse momentum p(T) &gt; 300 GeV and pseudorapidity vertical bar eta vertical bar &lt; 2. The measurements are compared to the expectations of Monte Carlo generators that match leading-logarithmic parton showers to leading-order, or next-to-leading-order, matrix elements. The generators describe the general features of the jets, although discrepancies are observed in some distributions.</p>
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6.
  • Aad, G., et al. (författare)
  • ATLAS measurements of the properties of jets for boosted particle searches
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 86:7, s. 072006
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>Measurements are presented of the properties of high transverse momentum jets, produced in proton-proton collisions at a center-of-mass energy of root s = 7 TeV. The data correspond to an integrated luminosity of 35 pb(-1) and were collected with the ATLAS detector in 2010. Jet mass, width, eccentricity, planar flow and angularity are measured for jets reconstructed using the anti-k(t) algorithm with distance parameters R 0: 6 and 1.0, with transverse momentum p(T) &gt; 300 GeV and pseudorapidity vertical bar eta vertical bar &lt; 2. The measurements are compared to the expectations of Monte Carlo generators that match leading-logarithmic parton showers to leading-order, or next-to-leading-order, matrix elements. The generators describe the general features of the jets, although discrepancies are observed in some distributions.</p>
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7.
  • Aad, G., et al. (författare)
  • Combined search for the Standard Model Higgs boson in pp collisions at root s=7 TeV with the ATLAS detector
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 86:3, s. 032003
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A combined search for the Standard Model Higgs boson with the ATLAS detector at the LHC is presented. The data sets used correspond to integrated luminosities from 4.6 fb(-1) to 4.9 fb(-1) of proton-proton collisions collected at root s = 7 TeV in 2011. The Higgs boson mass ranges of 111.4 GeV to 116.6 GeV, 119.4 GeV to 122.1 GeV, and 129.2 GeV to 541 GeV are excluded at the 95% confidence level, while the range 120 GeV to 560 GeV is expected to be excluded in the absence of a signal. An excess of events is observed at Higgs boson mass hypotheses around 126 GeV with a local significance of 2.9 standard deviations (sigma). The global probability for the background to produce an excess at least as significant anywhere in the entire explored Higgs boson mass range of 110-600 GeV is estimated to be similar to 15%, corresponding to a significance of approximately 1 sigma.</p>
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8.
  • Aad, G., et al. (författare)
  • Combined search for the Standard Model Higgs boson in pp collisions at root s=7 TeV with the ATLAS detector
  • 2012
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 86:3, s. 032003
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A combined search for the Standard Model Higgs boson with the ATLAS detector at the LHC is presented. The data sets used correspond to integrated luminosities from 4.6 fb(-1) to 4.9 fb(-1) of proton-proton collisions collected at root s = 7 TeV in 2011. The Higgs boson mass ranges of 111.4 GeV to 116.6 GeV, 119.4 GeV to 122.1 GeV, and 129.2 GeV to 541 GeV are excluded at the 95% confidence level, while the range 120 GeV to 560 GeV is expected to be excluded in the absence of a signal. An excess of events is observed at Higgs boson mass hypotheses around 126 GeV with a local significance of 2.9 standard deviations (sigma). The global probability for the background to produce an excess at least as significant anywhere in the entire explored Higgs boson mass range of 110-600 GeV is estimated to be similar to 15%, corresponding to a significance of approximately 1 sigma.</p>
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9.
  • Aad, G., et al. (författare)
  • Comprehensive measurements of t-channel single top-quark production cross sections at root S=7 TeV with the ATLAS detector
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 90:11
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>This article presents measurements of the t-channel single top-quark ((t) over bart) and top-antiquark (_ t) total production cross sections sdtq_ and sd _ tq_, their ratio Rt sdtq_= sd _ tq_, and a measurement of the inclusive production cross section sdtq _ _ tq_ in proton-proton collisions at ffiffiffi ps = 7 TeV at the LHC. Differential cross sections for the tq and _ tq processes are measured as a function of the transverse momentum and the absolute value of the rapidity of t and _ t, respectively. The analyzed data set was recorded with the ATLAS detector and corresponds to an integrated luminosity of 4.59 fb-1. Selected events contain one charged lepton, large missing transverse momentum, and two or three jets. The cross sections are measured by performing a binned maximum-likelihood fit to the output distributions of neural networks. The resulting measurements are sdtq_ 46 = 1dstat_ = 6dsyst_ pb, sd _ tq_ = 23 +/- 1dstat_ = 3dsyst_ pb, Rt = 2.04 0.13dstat_ +/-=0.12dsyst_, and sdtq _ _ tq_ = 68 +/-= 2dstat_ = 8dsyst_ pb, consistent with the Standard Model expectation. The uncertainty on the measured cross sections is dominated by systematic uncertainties, while the uncertainty on Rt is mainly statistical. Using the ratio of sdtq _ _ tq_ to its theoretical prediction, and assuming that the top-quark-related CKM matrix elements obey the relation jVtbj = jVtsj; jVtdj, we determine jVtbj = 1.02 = 0.07.</p>
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10.
  • Aad, G., et al. (författare)
  • Flavor tagged time-dependent angular analysis of the B-s(0) -&gt; J/psi phi decay and extraction of Delta Gamma(s) and the weak phase phi(s) in ATLAS
  • 2014
  • Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 90:5, s. 052007
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>A measurement of the Bs0→J/ψφ decay parameters, updated to include flavor tagging is reported using 4.9fb-1 of integrated luminosity collected by the ATLAS detector from s=7TeV pp collisions recorded in 2011 at the LHC. The values measured for the physical parameters are φs=0.12±0.25(stat)±0.05(syst)radΔΓs=0.053±0.021(stat)±0.010(syst)ps-1Γs=0.677±0.007(stat)±0.004(syst)ps-1|A (0)|2=0.220±0.008(stat)±0.009(syst)|A0(0)|2=0.529±0.006(stat)±0.012(syst)δ=3.89±0.47(stat)±0.11(syst)radwhere the parameter ΔΓs is constrained to be positive. The S-wave contribution was measured and found to be compatible with zero. Results for φs and ΔΓs are also presented as 68% and 95% likelihood contours, which show agreement with the Standard Model expectations.</p>
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