5,789 research outputs found
Measurement of the Higgs Boson Mass with a Linear e+e- Collider
The potential of a linear e+e- collider operated at a centre-of-mass energy
of 350 GeV is studied for the measurement of the Higgs boson mass. An
integrated luminosity of 500 fb-1 is assumed. For Higgs boson masses of 120,
150 and 180 GeV the uncertainty on the Higgs boson mass measurement is
estimated to be 40, 65 and 70 MeV, respectively. The effects of beam related
systematics, namely a bias in the beam energy measurement, the beam energy
spread and the luminosity spectrum due to beamstrahlung, on the precision of
the Higgs boson mass measurement are investigated. In order to keep the
systematic uncertainty on the Higgs boson mass well below the level of the
statistical error, the beam energy measurement must be controlled with a
relative precision better than 10-4.Comment: 19 pages, 10 Figure
Toward High Precision Higgs-Boson Measurements at the International Linear e+e- Collider
This report reviews the properties of Higgs bosons in the Standard Model (SM)
and its various extensions. We give an extensive overview about the potential
of the ILC operated at centre-of-mass energies up to 1 TeV (including the gamma
gamma option) for the determination of the Higgs boson properties. This
comprises the measurement of the Higgs boson mass, its couplings to SM fermions
and gauge bosons, and the determination of the spin and the CP quantum numbers
of the Higgs. The extensions of the SM that are analyzed in more detail are
heavy SM-like Higgs bosons, heavy Higgs bosons in the framework of
Supersymmetry (SUSY) and further exotic scenarios. We review recent theoretical
developments in the field of Higgs boson physics. The important question what
the ILC can contribute to Higgs boson physics after the LHC, the LHC/ILC
interplay and synergy is discussed. The impact of Higgs boson physics on
cosmology in several SUSY frameworks is analyzed. The impact of the accelerator
and dector performance on the precision of measurements are discussed in
detail. We propose a strategy to optimize future analyses. Open questions
arising for the various topics are listed, further topics of study and
corresponding roadmaps are suggested.Comment: 128 pages, lots of figures. One subsection added and other minor
modification
TESLA Technical Design Report Part III: Physics at an e+e- Linear Collider
The TESLA Technical Design Report Part III: Physics at an e+e- Linear
ColliderComment: 192 pages, 131 figures. Some figures have reduced quality. Full
quality figures can be obtained from http://tesla.desy.de/tdr. Editors -
R.-D. Heuer, D.J. Miller, F. Richard, P.M. Zerwa
Study of Spin and Decay-Plane Correlations of W Bosons in the e+e- -> W+W- Process at LEP
Data collected at LEP at centre-of-mass energies \sqrt(s) = 189 - 209 GeV are
used to study correlations of the spin of W bosons using e+e- -> W+W- -> lnqq~
events. Spin correlations are favoured by data, and found to agree with the
Standard Model predictions. In addition, correlations between the W-boson decay
planes are studied in e+e- -> W+W- -> lnqq~ and e+e- -> W+W- -> qq~qq~ events.
Decay-plane correlations, consistent with zero and with the Standard Model
predictions, are measured
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