SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Hansen Thomas V. O.) "

Sökning: WFRF:(Hansen Thomas V. O.)

Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
21.
  • Aad, G., et al. (författare)
  • Search for high mass dilepton resonances in pp collisions at root s=7 TeV with the ATLAS experiment
  • 2011
  • Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier. - 0370-2693 .- 1873-2445. ; 700:3-4, s. 163-180
  • Tidskriftsartikel (refereegranskat)abstract
    • This Letter presents a search for high mass e(+)e(-) or mu(+)mu(-) resonances in pp collisions at root s = 7 TeV at the LHC. The data were recorded by the ATLAS experiment during 2010 and correspond to a total integrated luminosity of similar to 40 pb(-1). No statistically significant excess above the Standard Model expectation is observed in the search region of dilepton invariant mass above 110 GeV. Upper limits at the 95% confidence level are set on the cross section times branching ratio of Z' resonances decaying to dielectrons and dimuons as a function of the resonance mass. A lower mass limit of 1.048 TeV on the Sequential Standard Model Z' boson is derived, as well as mass limits on Z* and E-6-motivated Z' models. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
  •  
22.
  • Aad, G., et al. (författare)
  • Search for pair production of first or second generation leptoquarks in proton-proton collisions at root s=7 TeV using the ATLAS detector at the LHC
  • 2011
  • Ingår i: Physical Review D (Particles, Fields, Gravitation and Cosmology). - : American Physical Society. - 1550-2368 .- 1550-7998. ; 83:11
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper describes searches for the pair production of first or second generation scalar leptoquarks using 35 pb(-1) of proton-proton collision data recorded by the ATLAS detector at root s = 7 TeV. Leptoquarks are searched in events with two oppositely-charged muons or electrons and at least two jets, and in events with one muon or electron, missing transverse momentum and at least two jets. After event selection, the observed yields are consistent with the predicted backgrounds. Leptoquark production is excluded at the 95% CL for masses M-LQ < 376 (319) GeV and M-LQ < 422 (362) GeV for first and second generation scalar leptoquarks, respectively, when assuming the branching fraction of a leptoquark to a charged lepton is equal to 1.0 (0.5).
  •  
23.
  • Aad, G., et al. (författare)
  • Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in root s=7 TeV proton-proton collisions
  • 2011
  • Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier. - 0370-2693 .- 1873-2445. ; 701:2, s. 186-203
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for squarks and gluinos in final states containing jets, missing transverse momentum and no electrons or muons is presented. The data were recorded by the ATLAS experiment in root s = 7 TeV proton-proton collisions at the Large Hadron Collider. No excess above the Standard Model background expectation was observed in 35 pb(-1) of analysed data. Gluino masses below 500 GeV are excluded at the 95% confidence level in simplified models containing only squarks of the first two generations, a gluino octet and a massless neutralino. The exclusion increases to 870 GeV for equal mass squarks and gluinos. In MSUGRA/CMSSM models with tan beta = 3, A(0) = 0 and mu > 0, squarks and gluinos of equal mass are excluded below 775 GeV. These are the most stringent limits to date. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
  •  
24.
  • Aad, G., et al. (författare)
  • Search for supersymmetric particles in events with lepton pairs and large missing transverse momentum in root s=7 TeV proton-proton collisions with the ATLAS experiment
  • 2011
  • Ingår i: European Physical Journal C. Particles and Fields. - New York : Springer. - 1434-6044 .- 1434-6052. ; 71:7
  • Tidskriftsartikel (refereegranskat)abstract
    • Results are presented of searches for the production of supersymmetric particles decaying into final states with missing transverse momentum and exactly two isolated leptons in root s = 7 TeV proton-proton collisions at the Large Hadron Collider. Search strategies requiring lepton pairs with identical-sign or opposite-sign electric charges are described. In a data sample corresponding to an integrated luminosity of 35 pb(-1) collected with the ATLAS detector, no significant excesses are observed. Based on specific benchmark models, limits are placed on the squark mass between 450 and 690 GeV for squarks approximately degenerate in mass with gluinos, depending on the supersymmetric mass hierarchy considered.
  •  
25.
  • Aad, G., et al. (författare)
  • Measurement of the differential cross-sections of inclusive, prompt and non-prompt J/psi production in proton-proton collisions at root s=7 TeV
  • 2011
  • Ingår i: Nuclear Physics, Section B. - : North-Holland. - 0550-3213 .- 1873-1562. ; 850:3, s. 387-444
  • Tidskriftsartikel (refereegranskat)abstract
    • The inclusive J/psi production cross-section and fraction of J/psi mesons produced in B-hadron decays are measured in proton proton collisions at root s = 7 TeV with the ATLAS detector at the LHC, as a function of the transverse momentum and rapidity of the J/psi, using 2.3 pb(-1) of integrated luminosity. The cross-section is measured from a minimum P-T of 1 GeV to a maximum of 70 GeV and for rapidities within vertical bar y vertical bar < 2.4 giving the widest reach of any measurement of J/psi production to date. The differential production cross-sections of prompt and non-prompt J/psi are separately determined and are compared to Colour Singlet NNLO*, Colour Evaporation Model, and FONLL predictions. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
  •  
26.
  • Aad, G., et al. (författare)
  • Measurement of the W+W- Cross Section in root s=7 TeV pp Collisions with ATLAS
  • 2011
  • Ingår i: Physical Review Letters. - : American Physical Society. - 1079-7114 .- 0031-9007. ; 107:4
  • Tidskriftsartikel (refereegranskat)abstract
    • This Letter presents a measurement of the W+W- production cross section in root s = 7 TeV pp collisions by the ATLAS experiment, using 34 pb(-1) of integrated luminosity produced by the Large Hadron Collider at CERN. Selecting events with two isolated leptons, each either an electron or a muon, 8 candidate events are observed with an expected background of 1.7 +/- 0.6 events. The measured cross section is 41(-16)(+20)(stat) +/- 5(syst) +/- 1(lumi) pb, which is consistent with the standard model prediction of 44 +/- 3 pb calculated at next-to-leading order in QCD.
  •  
27.
  • Aad, G., et al. (författare)
  • Measurements of underlying-event properties using neutral and charged particles in pp collisions at root s=900 GeV and root s=7 TeV with the ATLAS detector at the LHC
  • 2011
  • Ingår i: European Physical Journal C. Particles and Fields. - : Springer. - 1434-6044 .- 1434-6052. ; 71:5
  • Tidskriftsartikel (refereegranskat)abstract
    • We present first measurements of charged and neutral particle-flow correlations in pp collisions using the ATLAS calorimeters. Data were collected in 2009 and 2010 at centre-of-mass energies of 900 GeV and 7 TeV. Events were selected using a minimum-bias trigger which required a charged particle in scintillation counters on either side of the interaction point. Particle flows, sensitive to the underlying event, are measured using clusters of energy in the ATLAS calorimeters, taking advantage of their fine granularity. No Monte Carlo generator used in this analysis can accurately describe the measurements. The results are independent of those based on charged particles measured by the ATLAS tracking systems and can be used to constrain the parameters of Monte Carlo generators.
  •  
28.
  • Aad, G., et al. (författare)
  • Search for heavy vector-like quarks coupling to light quarks in proton-proton collisions at root s=7 TeV with the ATLAS detector
  • 2012
  • Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier. - 0370-2693 .- 1873-2445. ; 712:1-2, s. 22-39
  • Tidskriftsartikel (refereegranskat)abstract
    • This Letter presents a search for singly produced vector-like quarks, Q, coupling to light quarks, q. The search is sensitive to both charged current (CC) and neutral current (NC) processes, pp -> Qq -> Wqq' and pp -> Qq -> Zqq' with a leptonic decay of the vector gauge boson. In 1.04 fb(-1) of data taken in 2011 by the ATLAS experiment at a center-of-mass energy root s = 7 TeV, no evidence of such heavy vector-like quarks is observed above the expected Standard Model background. Limits on the heavy vector-like quark production cross section times branching ratio as a function of mass m(Q) are obtained. For a coupling K-qQ = v/m(Q), where v is the Higgs vacuum expectation value, 95% C.L. lower limits on the mass of a vector-like quark are set at 900 GeV and 760 GeV from CC and NC processes, respectively. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
  •  
29.
  • Aad, G., et al. (författare)
  • Search for stable hadronising squarks and gluinos with the ATLAS experiment at the LHC
  • 2011
  • Ingår i: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier. - 0370-2693 .- 1873-2445. ; 701:1, s. 1-19
  • Tidskriftsartikel (refereegranskat)abstract
    • Hitherto unobserved long-lived massive particles with electric and/or colour charge are predicted by a range of theories which extend the Standard Model. In this Letter a search is performed at the ATLAS experiment for slow-moving charged particles produced in proton-proton collisions at 7 TeV centre-of-mass energy at the LHC, using a data-set corresponding to an integrated luminosity of 34 pb(-1). No deviations from Standard Model expectations are found. This result is interpreted in a framework of supersymmetry models in which coloured sparticles can hadronise into long-lived bound hadronic states, termed R-hadrons, and 95% CL limits are set on the production cross-sections of squarks and gluinos. The influence of R-hadron interactions in matter was studied using a number of different models, and lower mass limits for stable sbottoms and stops are found to be 294 and 309 GeV respectively. The lower mass limit for a stable gluino lies in the range from 562 to 586 GeV depending on the model assumed. Each of these constraints is the most stringent to date. (C) 2011 CERN. Published by Elsevier B.V. All rights reserved.
  •  
30.
  • Aad, G., et al. (författare)
  • Search for supersymmetry in pp collisions at root s=7 Te V in final states with missing transverse momentum and b-jets with the ATLAS detector
  • 2012
  • Ingår i: Physical Review D (Particles, Fields, Gravitation and Cosmology). - : American Physical Society. - 1550-2368 .- 1550-7998. ; 85:11
  • Tidskriftsartikel (refereegranskat)abstract
    • The results of a search for supersymmetry in events with large missing transverse momentum and heavy-flavor jets using an integrated luminosity corresponding to 2.05 fb(-1) of pp collisions at root s = 7 TeV recorded with the ATLAS detector at the Large Hadron Collider are reported. No significant excess is observed with respect to the prediction for standard model processes. Results are interpreted in a variety of R-parity conserving models in which scalar bottoms and tops are the only scalar quarks to appear in the gluino decay cascade, and in an SO(10) model framework. Gluino masses up to 600-900 GeV are excluded, depending on the model considered.
  •  
Skapa referenser, mejla, bekava och länka
Typ av publikation
tidskriftsartikel (729)
forskningsöversikt (8)
konferensbidrag (1)
Typ av innehåll
refereegranskat (737)
övrigt vetenskapligt (1)
Författare/redaktör
Aad, G (568)
Yang, H. (559)
Zhang, X. (552)
Zhu, H. (528)
Li, S. (515)
Lee, S. C. (514)
visa fler...
Zwalinski, L. (510)
Zhang, H. (510)
Jia, J. (508)
Milov, A. (508)
Tojo, J. (507)
Zhu, J. (505)
Jinnouchi, O. (500)
Wang, H. (490)
Yang, Y. (489)
Kim, S. H. (487)
Kobayashi, T. (487)
Liu, Y. (487)
Hill, J. C. (484)
Bauer, F. (483)
Arai, Y. (475)
Nagasaka, Y. (475)
Chen, X. (474)
Vrba, V. (473)
Zhang, J. (473)
Schumacher, M. (472)
Chen, H. (471)
Ferrer, A. (470)
Garcia, C. (470)
Nilsson, P. (470)
Blumenschein, U. (469)
Boonekamp, M. (469)
Eigen, G. (469)
Ekelof, T. (469)
Fassouliotis, D. (469)
Francis, D. (469)
Hamacher, K. (469)
Kourkoumelis, C. (469)
Leitner, R. (469)
Li, H. (469)
Liebig, W. (469)
Meyer, J. (469)
Ouraou, A. (469)
Quadt, A. (469)
Salt, J. (469)
Stugu, B. (469)
Tanaka, S. (469)
Vachon, B. (469)
Wang, J. (469)
Masik, J. (469)
visa färre...
Lärosäte
Lunds universitet (673)
Kungliga Tekniska Högskolan (413)
Uppsala universitet (41)
Karolinska Institutet (39)
Umeå universitet (31)
Göteborgs universitet (19)
visa fler...
Stockholms universitet (18)
Linköpings universitet (15)
Chalmers tekniska högskola (8)
Jönköping University (3)
Örebro universitet (1)
Mittuniversitetet (1)
visa färre...
Språk
Engelska (738)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (632)
Medicin och hälsovetenskap (89)
Teknik (2)
Humaniora (1)

År

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy