Learn More
In view of the discovery of a new boson by the ATLAS and CMS Collaborations at the LHC, we present an update of the global Standard Model (SM) fit to electroweak precision data. Assuming the new particle to be the SM Higgs boson, all fundamental parameters of the SM are known allowing, for the first time, to overconstrain the SM at the electroweak scale and(More)
The global fit of the Standard Model to electroweak precision data, routinely performed by the LEP electroweak working group and others, demonstrated impressively the predictive power of electroweak unification and quantum loop corrections. We have revisited this fit in view of (i) the development of the new generic fitting package, Gfitter, allowing(More)
The global fit of the Standard Model to electroweak precision data, routinely performed by the LEP electroweak working group and others, demonstrated impressively the predictive power of electroweak unification and quantum loop corrections. We have revisited this fit in view of (i) the development of the new generic fitting package, Gfitter, allowing(More)
Three jet events arising from decays of the Z boson, collected by the DELPHI detector, were used to measure differences in quark and gluon fragmentation. Gluon jets were anti-tagged by identifying b quark jets. Unbiased quark jets came from events with two jets plus one photon. Quark and gluon jet properties in different energy ranges were compared for the(More)
B. Aurand, I. Bailey, C. Bartels, G. Blair, A. Brachmann, J. Clarke, L. Deacon, V. Duginov, A. Ghalumyan, A. Hartin, J. Hauptman, C. Helebrant, S. Hesselbach, D. Käfer, J. List, W. Lorenzon, A. Lyapin, I. Marchesini, R. Melikian, K. Mönig, K.C. Moffeit, G. Moortgat-Pick , N. Muchnoi, V. Nikoghosyan, S. Riemann, A. Sailer, A. Schälicke, H.J. Schreiber, P.(More)
The proposed International Linear Collider (ILC) is well-suited for discovering physics beyond the Standard Model and for precisely unraveling the structure of the underlying physics. The physics return can be maximized by the use of polarized beams. This report shows the paramount role of polarized beams and summarizes the benefits obtained from polarizing(More)
The beam energy at the ILC is needed to a precision of around 10−4 for accurate mass determinations of the top quark, the Higgs boson and in supersymmetry [1]. This measurement will mainly be done with a magnetic spectrometer [2]. However the absolute calibration of such a spectrometer is difficult and in addition the luminosity weighted centre of mass(More)
We study the pair production of scalar top quarks (stop, t̃1) in photon-photon collisions with the subsequent decay of the top squarks into b-quarks and charginos t̃1 → bχ̃±1 . We simulate this process by using PYTHIA6 for electron beam energy 2Ee beam = √ see = 1000 GeV. A set of criteria for physical variables is proposed which provides a good separation(More)