| 1. |
- Aaltonen, T., et al.
(författare)
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Higgs boson studies at the Tevatron
- 2013
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Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 88:5, s. 052014-
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Tidskriftsartikel (refereegranskat)abstract
- We combine searches by the CDF and D0 Collaborations for the standard model Higgs boson with mass in the range 90-200 GeV/c(2) produced in the gluon-gluon fusion, WH, ZH, t (t) over barH, and vector boson fusion processes, and decaying in the H -> b (b) over bar, H -> W+W-, H -> ZZ, H -> tau(+)tau(-), and H -> gamma gamma modes. The data correspond to integrated luminosities of up to 10 fb(-1) and were collected at the Fermilab Tevatron in p (p) over bar collisions at root s = 1.96 TeV. The searches are also interpreted in the context of fermiophobic and fourth generation models. We observe a significant excess of events in the mass range between 115 and 140 GeV/c(2). The local significance corresponds to 3.0 standard deviations at m(H) = 125 GeV/c(2), consistent with the mass of the Higgs boson observed at the LHC, and we expect a local significance of 1.9 standard deviations. We separately combine searches for H -> b (b) over bar, H -> W+W-, H -> tau(+)tau(-), and H -> gamma gamma. The observed signal strengths in all channels are consistent with the presence of a standard model Higgs boson with a mass of 125 GeV/c(2).
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| 2. |
- Aaltonen, T., et al.
(författare)
-
Combination of CDF and D0 W-Boson mass measurements
- 2013
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Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 88:5, s. 052018-
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Tidskriftsartikel (refereegranskat)abstract
- We summarize and combine direct measurements of the mass of the W boson in root s = 1.96 TeV proton-antiproton collision data collected by CDF and D0 experiments at the Fermilab Tevatron Collider. Earlier measurements from CDF and D0 are combined with the two latest, more precise measurements: a CDF measurement in the electron and muon channels using data corresponding to 2.2 fb(-1) of integrated luminosity, and a D0 measurement in the electron channel using data corresponding to 4.3 fb(-1) of integrated luminosity. The resulting Tevatron average for the mass of the W boson is M-W = 80387 +/- 16 MeV. Including measurements obtained in electron-positron collisions at LEP yields the most precise value of M-W = 80385 +/- 15 MeV.
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| 3. |
- Rostkowski, P., et al.
(författare)
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Non-target screening of environmental samples by low and high resolution time of flight mass spectrometry (TOF-MS)
- 2013
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Ingår i: Proceedings of the 13th International Conference on Environmental Science and Technology. - : Global Nest, Secretariat. - 9789607475510
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Konferensbidrag (refereegranskat)abstract
- The already substantial number of different organic chemical substances emitted to, and circulating in the environment is increasing. Due both to this growing number of chemicals, and the accumulating knowledge of their potential negative environmental and health effects, the number of emerging contaminants in Europe and elsewhere is also increasing. In regular environmental analysis, a targeted approach is generally used, i.e. the analytes of interest are selected before making measurements. However, the problem with targeted methods is that chemicals, which are not initially anticipated, are not detected regardless of how high their concentration might be. Thus the non-target approaches are needed to identify the unknowns and to reveal a more complete profile of contaminants. In this study we utilized modern techniques, such as high and low resolution time of flight mass spectrometry (TOF-MS) combined with either ultra-high-performance liquid chromatography (UPLC), gas chromatography (GC) or multidimensional gas chromatography (GCxGC) to analyze wastewater, sludge, sediment and biota samples. This approach proved to be useful, a number of anthropogenic compounds have been tentatively identified and included: pharmaceuticals and personal care products, plasticizers and flame retardants, polymer additives, and other well-known persistent organic pollutants. Additionally, full-scan acquisition allows retrospective analysis for emerging contaminants years after the data has been acquired.
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