1,721,411 research outputs found
and boson precision measurements at ATLAS
Full text linkThe large statistics reachable at LHC and the clear signature ofleptonic decays allow to perform high-precision measurements of and bosons. In this contribution the most recent results are presented on studies at the centre-of-mass energy of 13 . In addition, the firstWmass measurement performed atLHC at= 7 is also described
W/Z+jets and W/Z+HF-jets production at ATLAS
No full textThe production of jets in association with a W or a Z boson in proton-proton collisions is an important process to study QCD in multi-scale environments. Moreover, measurements of W/Z boson production associated with heavy- flavor (HF) quarks provide important experimental constraints to improve the theoretical description of these processes, as the uncertainties in the current predictions are larger than the ones obtained in the inclusive case. The detailed knowledge of the production of jets associated with electroweak gauge bosons is also a key element for the understanding of Higgs initiated processes and Beyond Standard Model searches, as they represent an important background in these measurements. Results for the differential production cross sections for W/Z+jets and W/Z+HF-jets in several kinematics variables measured by the ATLAS in proton-proton collisions at cms energies of 7 and 13 TeV are presented and compared to high- order QCD calculations and recent Monte Carlo simulations
ATLAS measurement of Electroweak Vector Boson production
Full text linkThe measurements of the Drell-Yan production of W and Z/γ⁎ bosons at the LHC provide a benchmark of our understanding of the perturbative QCD and probe the proton structure in a unique way. The ATLAS collaboration has performed new high precision measurements of the double differential cross-sections as a function of the dilepton mass and rapidity. The measurements are compared to state of calculations at NNLO in QCD and constrain the photon content of the proton. The angular distributions of the Drell-Yan lepton pairs around the Z-boson mass peak probe the underlying QCD dynamics of the Z-boson production mechanisms. The complete set of angular coefficients describing these distributions is presented and compared to theoretical predictions highlighting different approaches of the QCD and EW modelling. First precise inclusive measurements of W and Z production at 13 TeV are presented. and ratios profit from a cancellation of experimental uncertainties
Nonlinear Estimation of Lifetime Intergenerational Economic Mobility and the Role of Education
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Urban Wage Premia, Cost of Living, and Collective Bargaining
No full textIn this paper, we estimate the urban wage premia (UWP) in Italy, with its economy characterized by the interplay between collective bargaining and spatial heterogeneity in the cost of living. We implement a reduced-form regression analysis using both nominal and real (in temporalandspatialterms)wages. Ourdatasetforthe2005-2015periodincludes,forworkers’ characteristics,uniqueadministrativedataprovidedbyItalianSocialSecurityInstituteand, for the local CPI computation, housing prices collected by Italian Revenue Agency. For employees covered by collective bargaining, we find a zero UWP in nominal terms and a negative and non-negligible UWP in real terms (-5%). To capture the role played by centralized wage settings, we also consider various groups of self-employed workers, who are not covered by nationallabouragreements,whilelivinginthesamelocationsandenjoyingthesameamenities as employees. We find that the UWP for self-employed workers are up to 25 times greater thanforemployees. Moreover,sortingprovesmorenotableinthecaseofself-employedworkers, i.e. the larger UWP provide the higher incentives for high-skilled individuals and better firms to locate in cities. Our findings are confirmed on extending the analysis along the wage distribution
Innovation, on-the-job learning, and labor contracts: an organizational equilibria approach
No full textAn established tenet of the literature isthat the use of flexible labor leads to less innovation. Yet, less attention has been paid to the possibility that it is the decision to innovate that generates the incentive to hire on a permanent basis. The goal of this paper is to show the existence of interlocking complementarities between the firm’s technological and hiring strategies. To do so, we develop a simple model where the workers’ decision to invest in human capital is affected by the type of employment contract (temporary versus permanent) and by the type of technological investments (routine versus innovative). When the firm is unable to coordinate its actions across these different domains, two equilibria simultaneously exist: in the ‘high-road’ equilibrium, firms invest more in innovative projects and hire on a permanent basis; in the ‘low-road’ equilibrium, they invest more in routine projects and hire on a temporary basis
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