Circular electron positron colliders, such as the CEPC and FCC-ee, have been proposed to measure Higgs boson properties precisely, test the Standard Model, search for physics beyond the Standard ...Model, and so on. One of the important goals of these colliders is to measure the
W
boson mass with great precision by taking data around the
W
-pair production threshold. In this paper, the data-taking scheme is investigated to maximize the achievable precisions of the
W
boson mass and width with a threshold scan, when various systematic uncertainties are taken into account. The study shows that an optimal and realistic data-taking scheme is to collect data at three center-of-mass energies and that precisions of 1.0 MeV and 3.4 MeV can be achieved for the mass and width of the
W
boson, respectively, with a total integrated luminosity of
L
=
3.2
ab
-
1
and several assumptions of the systematic uncertainty sources.
The CDF II Level 1 Track Trigger Upgrade Jones, M.; Abulencia, A.; Azzurri, P. ...
IEEE transactions on nuclear science,
02/2008, Letnik:
55, Številka:
1
Journal Article
Recenzirano
The CDF II detector uses dedicated hardware to identify charged tracks that are used in an important class of level 1 trigger decisions. Until now, this hardware identified track segments based on ...patterns of hits on only the axial sense wires in the tracking chamber and determined the transverse momentum of track candidates from patterns of track segments. This identification is efficient but produces trigger rates that grow rapidly with increasing instantaneous luminosity. High trigger rates are a consequence of the large numbers of low momentum tracks produced in inelastic collisions which generate overlapping patterns of hits that match those expected for high-momentum tracks. A recently completed upgrade to the level 1 track trigger system makes use of information from stereo wires in the tracking chamber to reduce the rate of false triggers while maintaining high efficiency for real high momentum particles. We describe the new electronics used to instrument the additional sense wires, identify track segments and correlate these with the track candidates found by the original track trigger system. The performance of this system is characterized in terms of the efficiency for identifying charged particles and the improved rejection of axial track candidates that do not correspond to real particles.
AbstractThe negative outcome of gaugino searches at LEP has been one of the most disappointing results for fans of supersymmetric models. In the framework of minimal supersymmetric models with GUT ...unification assumptions, the combined absence of supersymmetry and Higgs signals in the LEP data, sets stringent constraints on the models parameter space, and lower limits on the mass of the lightest neutralino and of other supersymmetric particles. All limits are given at 95% Confidence Level. PACS: 11.30.Pb Supersymmetry – 12.60.Jv Supersymmetric models – 13.66.Hk Production of non-standard model particles in e-e+ interactions – 14.80.Ly Supersymmetric partners of known particles
Pair production of W Bosons at LEP2 Azzurri, P.
Nuclear physics. Section B, Proceedings supplement,
06/1998, Letnik:
65, Številka:
1
Journal Article
We report on the measurements of W pair productions achieved with the 1996 run by the four LEP Collaborations at centre-of-mass energies of 161 GeV and 172 GeV. Combining all possible leptonic and ...hadronic final states, partial and total WW cross-sections are measured and direct measurements of W Branching Ratios are extracted. Finally the W mass is derived in the framework of the Standard Model profiting from its remarkable dependence from the total cross-section at the kinematic production threshold of 161 GeV.
We report on a CDF measurement of the total cross section and rapidity distribution, $d\sigma/dy$, for $q\bar{q}\to \gamma^{*}/Z\to e^{+}e^{-}$ events in the $Z$ boson mass region ($66
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