SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "LAR1:uu ;pers:(Aad G)"

Sökning: LAR1:uu > Aad G

Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Aad, G, et al. (författare)
  • Dijet Resonance Search with Weak Supervision Using s =13 TeV pp Collisions in the ATLAS Detector
  • 2020
  • Ingår i: Physical Review Letters. - : American Physical Society. - 1079-7114 .- 0031-9007. ; 125:13
  • Tidskriftsartikel (refereegranskat)abstract
    • This Letter describes a search for narrowly resonant new physics using a machine-learning anomaly detection procedure that does not rely on signal simulations for developing the analysis selection. Weakly supervised learning is used to train classifiers directly on data to enhance potential signals. The targeted topology is dijet events and the features used for machine learning are the masses of the two jets. The resulting analysis is essentially a three-dimensional search A→BC, for mA∼O(TeV), mB,mC∼O(100 GeV) and B, C are reconstructed as large-radius jets, without paying a penalty associated with a large trials factor in the scan of the masses of the two jets. The full run 2 s=13 TeV pp collision dataset of 139 fb-1 recorded by the ATLAS detector at the Large Hadron Collider is used for the search. There is no significant evidence of a localized excess in the dijet invariant mass spectrum between 1.8 and 8.2 TeV. Cross-section limits for narrow-width A, B, and C particles vary with mA, mB, and mC. For example, when mA=3 TeV and mBâ200 GeV, a production cross section between 1 and 5 fb is excluded at 95% confidence level, depending on mC. For certain masses, these limits are up to 10 times more sensitive than those obtained by the inclusive dijet search. These results are complementary to the dedicated searches for the case that B and C are standard model bosons. © 2020 CERN.
  •  
2.
  • Tidskriftsartikel (refereegranskat)
  •  
3.
  •  
4.
  • Aad, G, et al. (författare)
  • Measurements of inclusive and differential cross-sections of combined tt¯ γ and tWγ production in the eμ channel at 13 TeV with the ATLAS detector : Journal of High Energy Physics
  • 2020
  • Ingår i: Journal of High Energy Physics. - : Springer. - 1029-8479 .- 1126-6708. ; 2020:9
  • Tidskriftsartikel (refereegranskat)abstract
    • Inclusive and differential cross-sections for the production of top quarks in association with a photon are measured with proton-proton collision data corresponding to an integrated luminosity of 139 fb−1. The data were collected by the ATLAS detector at the LHC during Run 2 between 2015 and 2018 at a centre-of-mass energy of 13 TeV. The measurements are performed in a fiducial volume defined at parton level. Events with exactly one photon, one electron and one muon of opposite sign, and at least two jets, of which at least one is b-tagged, are selected. The fiducial cross-section is measured to be 39.6−2.3+2.7 fb. Differential cross-sections as functions of several observables are compared with state-of-the-art Monte Carlo simulations and next-to-leading-order theoretical calculations. These include cross-sections as functions of photon kinematic variables, angular variables related to the photon and the leptons, and angular separations between the two leptons in the event. All measurements are in agreement with the predictions from the Standard Model. [Figure not available: see fulltext.] © 2020, The Author(s).
  •  
5.
  •  
6.
  •  
7.
  • Aad, G., et al. (författare)
  • Search for a new resonance decaying to a W or Z boson and a Higgs boson in the ll/lv/vv plus b(b)over-bar final states with the ATLAS detector
  • 2015
  • Ingår i: European Physical Journal C. - : Springer. - 1434-6044 .- 1434-6052. ; 75:6
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for a new resonance decaying to a W or Z boson and a Higgs boson in the ll/lv/vv + b (b) over bar final states is performed using 20.3 fb(-1) of pp collision data recorded at root s = 8 TeV with the ATLAS detector at the Large Hadron Collider. The search is conducted by examining the WH/ZH invariant mass distribution for a localized excess. No significant deviation from the Standard Model background prediction is observed. The results are interpreted in terms of constraints on the Minimal Walking Technicolor model and on a simplified approach based on a phenomenological Lagrangian of Heavy Vector Triplets.
  •  
8.
  • Aad, G, et al. (författare)
  • Search for dijet resonances in events with an isolated charged lepton using √s = 13 TeV proton-proton collision data collected by the ATLAS detector
  • 2020
  • Ingår i: Journal of High Energy Physics. - : Springer. - 1029-8479 .- 1126-6708. ; 2020:6
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for dijet resonances in events with at least one isolated charged lepon is performed using 139 fb−1 of s = 13 TeV proton-proton collision data recorded by the ATLAS detector at the LHC. The dijet invariant-mass (mjj) distribution constructed from events with at least one isolated electron or muon is searched in the region 0.22 < mjj< 6.3 TeV for excesses above a smoothly falling background from Standard Model processes. Triggering based on the presence of a lepton in the event reduces limitations imposed by minimum transverse momentum thresholds for triggering on jets. This approach allows smaller dijet invariant masses to be probed than in inclusive dijet searches, targeting a variety of new-physics models, for example ones in which a new state is produced in association with a leptonically decaying W or Z boson. No statistically significant deviation from the Standard Model background hypothesis is found. Limits on contributions from generic Gaussian signals with widths ranging from that determined by the detector resolution up to 15% of the resonance mass are obtained for dijet invariant masses ranging from 0.25 TeV to 6 TeV. Limits are set also in the context of several scenarios beyond the Standard Model, such as the Sequential Standard Model, a technicolor model, a charged Higgs boson model and a simplified Dark Matter model. [Figure not available: see fulltext.] © 2020, The Author(s).
  •  
9.
  • Aad, G, et al. (författare)
  • Search for new phenomena in events with at least three photons collected in pp collisions at √s = 8 TeV with the ATLAS detector
  • 2016
  • Ingår i: European Physical Journal C. - : Springer. - 1434-6044 .- 1434-6052. ; 76:4
  • Tidskriftsartikel (refereegranskat)abstract
    • Results of a search for new phenomena in events with at least three photons are reported. Data from proton– proton collisions at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb−1, were collected with the ATLAS detector at the LHC. The observed data are well described by the Standard Model. Limits at the 95 % confidence level on new phenomena are presented based on the rate of events in an inclusive signal region and a restricted signal region targeting the rare decay Z → 3γ, as well as di-photon and tri-photon resonance searches. For a Standard Model Higgs boson decaying to four photons via a pair of intermediate pseudoscalar particles (a), limits are found to be σ ×BR(h → aa)×BR(a → γ γ)2< 10−3σSM for 10 GeV < ma < 62 GeV. Limits are also presented for Higgs boson-like scalars (H) for mH > 125 GeV, and for a Z' decaying to three photons via Z' → a + γ → 3γ. Additionally, the observed limit on the branching ratio of the Z boson decay to three photons is found to be BR(Z → 3γ) < 2.2 × 10−6, a result five times stronger than the previous result from LEP. © CERN for the benefit of the ATLAS collaboration 2016.
  •  
10.
  • Aad, G, et al. (författare)
  • Search for supersymmetry at √s= 13 TeV in final states with jets and two same-sign leptons or three leptons with the ATLAS detector
  • 2016
  • Ingår i: European Physical Journal C. - : Springer. - 1434-6044 .- 1434-6052. ; 76:5
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for strongly produced supersymmetric particles is conducted using signatures involving multiple energetic jets and either two isolated leptons (e or μ) with the same electric charge or at least three isolated leptons. The search also utilises b-tagged jets, missing transverse momentum and other observables to extend its sensitivity. The analysis uses a data sample of proton–proton collisions at √s= 13 TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015 corresponding to a total integrated luminosity of 3.2 fb-1. No significant excess over the Standard Model expectation is observed. The results are interpreted in several simplified supersymmetric models and extend the exclusion limits from previous searches. In the context of exclusive production and simplified decay modes, gluino masses are excluded at 95 % confidence level up to 1.1–1.3 TeV for light neutralinos (depending on the decay channel), and bottom squark masses are also excluded up to 540 GeV. In the former scenarios, neutralino masses are also excluded up to 550–850 GeV for gluino masses around 1 TeV. © 2016, CERN for the benefit of the ATLAS collaboration.
  •  
Skapa referenser, mejla, bekava och länka
Typ av publikation
tidskriftsartikel (141)
rapport (1)
konferensbidrag (1)
Typ av innehåll
refereegranskat (143)
Författare/redaktör
Zwalinski, L. (143)
Ekelöf, Tord (140)
Ellert, Mattias (140)
Brenner, Richard (139)
Ferrari, Arnaud (88)
visa fler...
Öhman, Henrik (67)
Pelikan, Daniel (64)
Isaksson, Charlie (62)
Bokan, Petar (57)
Madsen, Alexander (53)
Bergeås Kuutmann, El ... (50)
Ferrari, Arnaud, 197 ... (50)
Rangel-Smith, Camill ... (49)
Aaboud, M. (47)
Asimakopoulou, Eleni ... (46)
Strandberg, Sara (46)
Hellman, Sten (46)
Bohm, Christian (46)
Moa, Torbjörn (46)
Clément, Christophe (46)
Sjölin, Jörgen (46)
Silverstein, Samuel ... (45)
Milstead, David A. (45)
Hedberg, Vincent (43)
Jarlskog, Göran (43)
Mjörnmark, Ulf (43)
Smirnova, Oxana (43)
Isacson, Max (43)
Buszello, Claus P. (43)
Lytken, Else (42)
Åkesson, Torsten (41)
Bocchetta, Simona (41)
Ellajosyula, Venugop ... (40)
Jon-And, Kerstin (40)
Bergeås, Elin Kuutma ... (40)
Gradin, P.O. Joakim (38)
Mårtensson, Mikael U ... (38)
Abbott, B. (34)
Abdinov, O (34)
Doglioni, Caterina (33)
Ughetto, Michaël (33)
Strandberg, Jonas (32)
Pöttgen, Ruth (32)
Ripellino, Giulia (30)
Ohm, Christian (28)
Shaikh, Nabila W. (28)
Wallängen, Veronica (28)
Valdes Santurio, Edu ... (27)
Sidebo, P. Edvin (25)
visa färre...
Lärosäte
Uppsala universitet (143)
Lunds universitet (42)
Stockholms universitet (28)
Kungliga Tekniska Högskolan (26)
Språk
Engelska (143)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (129)

År

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy