| 1. |
- Bravo, L, et al.
(author)
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- 2021
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swepub:Mat__t
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| 2. |
- Tabiri, S, et al.
(author)
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- 2021
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swepub:Mat__t
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| 3. |
- Bouyoucef, S E, et al.
(author)
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Poster Session 2 : Monday 4 May 2015, 08
- 2015
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In: European Heart Journal Cardiovascular Imaging. - : Oxford University Press (OUP). - 2047-2404 .- 2047-2412. ; 16 Suppl 1
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Journal article (peer-reviewed)
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| 4. |
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| 5. |
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| 6. |
- Algaba, Juan-Carlos, et al.
(author)
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Broadband Multi-wavelength Properties of M87 during the 2017 Event Horizon Telescope Campaign
- 2021
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In: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8213 .- 2041-8205. ; 911:1
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Research review (peer-reviewed)abstract
- In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and size are consistent with theoretical expectations for a weakly accreting supermassive black hole of mass ∼6.5 × 109 M o˙. The EHTC also partnered with several international facilities in space and on the ground, to arrange an extensive, quasi-simultaneous multi-wavelength campaign. This Letter presents the results and analysis of this campaign, as well as the multi-wavelength data as a legacy data repository. We captured M87 in a historically low state, and the core flux dominates over HST-1 at high energies, making it possible to combine core flux constraints with the more spatially precise very long baseline interferometry data. We present the most complete simultaneous multi-wavelength spectrum of the active nucleus to date, and discuss the complexity and caveats of combining data from different spatial scales into one broadband spectrum. We apply two heuristic, isotropic leptonic single-zone models to provide insight into the basic source properties, but conclude that a structured jet is necessary to explain M87's spectrum. We can exclude that the simultaneous γ-ray emission is produced via inverse Compton emission in the same region producing the EHT mm-band emission, and further conclude that the γ-rays can only be produced in the inner jets (inward of HST-1) if there are strongly particle-dominated regions. Direct synchrotron emission from accelerated protons and secondaries cannot yet be excluded.
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| 17. |
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| 18. |
- Aad, G, et al.
(author)
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Search for Higgs Boson Pair Production in the γγbb[over ¯] Final State Using pp Collision Data at sqrt[s]=8 TeV from the ATLAS Detector.
- 2015
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In: Physical Review Letters. - 1079-7114. ; 114:8
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Journal article (peer-reviewed)abstract
- Searches are performed for resonant and nonresonant Higgs boson pair production in the γγbb[over ¯] final state using 20 fb^{-1} of proton-proton collisions at a center-of-mass energy of 8 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider. A 95% confidence level upper limit on the cross section times branching ratio of nonresonant production is set at 2.2 pb, while the expected limit is 1.0 pb. The difference derives from a modest excess of events, corresponding to 2.4 standard deviations from the background-only hypothesis. The limit observed in the search for a narrow X→hh resonance ranges between 0.7 and 3.5 pb as a function of the resonance mass.
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| 19. |
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| 21. |
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| 23. |
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| 24. |
- Aamodt, K., et al.
(author)
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First proton-proton collisions at the LHC as observed with the ALICE detector: measurement of the charged-particle pseudorapidity density at root s=900 GeV
- 2010
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In: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 65:1-2, s. 111-125
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Journal article (peer-reviewed)abstract
- On 23rd November 2009, during the early commissioning of the CERN Large Hadron Collider (LHC), two counter-rotating proton bunches were circulated for the first time concurrently in the machine, at the LHC injection energy of 450 GeV per beam. Although the proton intensity was very low, with only one pilot bunch per beam, and no systematic attempt was made to optimize the collision optics, all LHC experiments reported a number of collision candidates. In the ALICE experiment, the collision region was centred very well in both the longitudinal and transverse directions and 284 events were recorded in coincidence with the two passing proton bunches. The events were immediately reconstructed and analyzed both online and offline. We have used these events to measure the pseudorapidity density of charged primary particles in the central region. In the range vertical bar eta vertical bar < 0.5, we obtain dN(ch)/d eta = 3.10 +/- 0.13(stat.) +/- 0.22(syst.) for all inelastic interactions, and dN(ch)/d eta = 3.51 +/- 0.15(stat.) +/- 0.25(syst.) for nonsingle diffractive interactions. These results are consistent with previous measurements in proton-antiproton interactions at the same centre-of-mass energy at the CERN Sp<(p)over bar>S collider. They also illustrate the excellent functioning and rapid progress of the LHC accelerator, and of both the hardware and software of the ALICE experiment, in this early start-up phase.
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| 25. |
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| 26. |
- Aad, G., et al.
(author)
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- 2014
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Journal article (peer-reviewed)
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| 27. |
- Aad, G., et al.
(author)
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- 2014
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In: Physical Review C (Nuclear Physics). - 0556-2813 .- 1089-490X. ; 90:4
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Journal article (peer-reviewed)
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| 28. |
- Aad, G., et al.
(author)
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- 2015
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Journal article (peer-reviewed)
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| 29. |
- Aad, G., et al.
(author)
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- 2014
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Journal article (peer-reviewed)
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| 30. |
- Aad, G., et al.
(author)
-
- 2014
-
In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 74:10
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Journal article (peer-reviewed)
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| 31. |
- Aad, G., et al.
(author)
-
- 2014
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Journal article (peer-reviewed)
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| 32. |
- Aad, G., et al.
(author)
-
- 2014
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Journal article (peer-reviewed)
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| 33. |
- Aad, G., et al.
(author)
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- 2014
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Journal article (peer-reviewed)
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| 34. |
- Aad, G., et al.
(author)
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- 2014
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Journal article (peer-reviewed)
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| 35. |
- Aad, G., et al.
(author)
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- 2015
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Journal article (peer-reviewed)
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| 36. |
- Aad, G., et al.
(author)
-
- 2014
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Journal article (peer-reviewed)
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| 37. |
- Aad, G., et al.
(author)
-
- 2015
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Journal article (peer-reviewed)
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| 38. |
- Aad, G., et al.
(author)
-
- 2014
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Journal article (peer-reviewed)
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| 39. |
- Aad, G., et al.
(author)
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- 2014
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 74:12
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Journal article (peer-reviewed)
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| 40. |
- Aad, G., et al.
(author)
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- 2014
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Journal article (peer-reviewed)
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| 41. |
- Aad, G., et al.
(author)
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- 2014
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 74:11
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| 42. |
- Aad, G., et al.
(author)
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- 2015
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 75:1
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| 43. |
- Aad, G., et al.
(author)
-
- 2015
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In: Physical Review D (Particles, Fields, Gravitation and Cosmology). - 1550-2368 .- 1550-7998. ; 91:5
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Journal article (peer-reviewed)
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| 44. |
- Aad, G., et al.
(author)
-
- 2014
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :9
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Journal article (peer-reviewed)
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| 45. |
- Aad, G., et al.
(author)
-
- 2015
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :1, s. 1-67
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Journal article (peer-reviewed)
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| 46. |
- Aad, G., et al.
(author)
-
- 2014
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :11
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| 47. |
- Aad, G., et al.
(author)
-
- 2014
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :10
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Journal article (peer-reviewed)
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| 48. |
- Aad, G., et al.
(author)
-
- 2014
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In: Physical Review D. Particles and fields. - 0556-2821 .- 1089-4918. ; 90:11, s. 112006-
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Journal article (peer-reviewed)
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| 49. |
- Aad, G., et al.
(author)
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- 2014
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :9, s. 1-61
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Journal article (peer-reviewed)
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| 50. |
- Aad, G., et al.
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- 2014
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :8
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Journal article (peer-reviewed)
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