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- Klinthäll, Martin
(författare)
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Immigration, Integration and Return Migration: The Swedish Experience
- 2008
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Ingår i: Population Bulletin of the United Nations.
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Tidskriftsartikel (refereegranskat)abstract
- Return migration is an important phenomenon that involves a large share of all migrants, and has great potential for the enhancement of economic development, for instance through remittances and investments by migrants who are still abroad, and “brain gain” when migrants return with working experience from their former host countries. This paper deals with return migration, by refugee immigrants as well as labor migrants and retirees, with reference to empirical evidence from Sweden. Return migration from Sweden, as well as from other western societies, has decreased considerably over the last decades, primarily due to a change in the composition of immigrant populations. Labor migrants, who dominated immigration prior to the recruitment halt in the early 1970s, generally display high rates of return migration, frequently higher than 50 percent. Refugees, on the other hand, who have dominated immigration from the 1970s onwards, have displayed low rates of return migration, primarily due to the security situation in their home countries. Analyses of Swedish population register data shows that return migrants tend to be positively selected in terms of income and education, which is beneficial for origin countries. However, migration tends to be positively selected in general and therefore, temporary migration has high potential for enhancing economic development, in origin countries as well as in destination countries. Destination countries benefit from a positively selected immigration, whereas origin countries benefit from positively selected return migration. Future labor migration flows, such as labor migration from new to old member states of the EU, are therefore expected to be positively selected, both when it comes to immigration and return migration, and return migration rates will probably be relatively high. Refugee crises in the 1990s led to a change in the direction of policy discussions, from an emphasis on permanent residence rights for refugees to a focus on temporary protection and repatriation. The Swedish experience shows that political improvements in refugee source countries cannot be expected to result in large-scale return migration, unless the changes are accompanied by economic stability. The difference between Chileans and Poles, regarding their migratory response to democratization at home, can be attributed to large difference in economic opportunities for return migrants in Chile relative to Poland in the years after 1990. Positive income selectivity among return migrants indicates that return migration is resource demanding and thus, marginalized immigrants will have worse opportunities for return migration. Institutional arrangements regarding refugee reception and measures for economic integration of refugees are therefore crucial for societies that want to encourage return migration to former refugee sources. Temporary residence models are inefficient when it comes to economic integration of immigrants and may undermine their own purpose, i.e. return migration by refugees. Permanent residence models, in contrast, allow migrants to be more efficient regarding host country-specific investments and, as a result, such models are more likely to provide economic integration of immigrants and increase opportunities for return migration.
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- Aad, G., et al.
(författare)
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- 2015
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Tidskriftsartikel (refereegranskat)
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- Aaltonen, T., et al.
(författare)
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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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- Aaltonen, T., et al.
(författare)
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Combination of measurements of the top-quark pair production cross section from the Tevatron Collider
- 2014
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Ingår i: Physical Review D. - 1550-7998 .- 1550-2368. ; 89:7
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Tidskriftsartikel (refereegranskat)abstract
- We combine six measurements of the inclusive top-quark pair (t(sic)) production cross section (sigma(t)(sic)) from data collected with the CDF and D0 detectors at the Fermilab Tevatron with proton-antiproton collisions at root s = 1.96 TeV. The data correspond to integrated luminosities of up to 8.8 fb(-1). We obtain a value of sigma tt = 7.60 +/- 0.41 pb for a top-quark mass of m(t) = 172.5 GeV. The contributions to the uncertainty are 0.20 pb from statistical sources, 0.29 pb from systematic sources, and 0.21 pb from the uncertainty on the integrated luminosity. The result is in good agreement with the standard model expectation of 7.35(-0.33)(+0.28) pb at next-to-next-to-leading order and next-to-next-to leading logarithms in perturbative QCD.
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- Aaltonen, T., et al.
(författare)
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Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron
- 2018
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Ingår i: Physical Review Letters. - : AMER PHYSICAL SOC. - 0031-9007 .- 1079-7114. ; 120:4
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Tidskriftsartikel (refereegranskat)abstract
- The CDF and D0 experiments at the Fermilab Tevatron have measured the asymmetry between yields of forward- and backward-produced top and antitop quarks based on their rapidity difference and the asymmetry between their decay leptons. These measurements use the full data sets collected in proton-antiproton collisions at a center-of-mass energy of root s = 1.96 TeV. We report the results of combinations of the inclusive asymmetries and their differential dependencies on relevant kinematic quantities. The combined inclusive asymmetry is A(FB)(t (t) over bar) = 0.128 +/- 0.025. The combined inclusive and differential asymmetries are consistent with recent standard model predictions.
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