144 research outputs found
A study of the measurement precision of the Higgs boson decaying into tau pairs at the ILC
We evaluate the measurement precision of the production cross section times
the branching ratio of the Higgs boson decaying into tau lepton pairs at the
International Linear Collider (ILC). We analyze various final states associated
with the main production mechanisms of the Higgs boson, the Higgs-strahlung and
WW-fusion processes. The statistical precision of the production cross section
times the branching ratio is estimated to be 2.6% and 6.9% for the
Higgs-strahlung andWW-fusion processes, respectively, with the nominal
integrated luminosities assumed in the ILC Technical Design Report; the
precision improves to 1.0% and 3.4% with the running scenario including
possible luminosity upgrades. The study provides a reference performance of the
ILC for future phenomenological analyses.Comment: 10 pages, 6 figures, 9 tables, revised from v
Prospects of measuring the branching fraction of the Higgs boson decaying into muon pairs at the International Linear Collider
The prospects for measuring the branching fraction of
at the International Linear Collider (ILC) have been evaluated based on a full
detector simulation of the International Large Detector (ILD) concept,
considering centre-of-mass energies () of 250 GeV and 500 GeV. For
both cases, the two final states and
have been analyzed. For integrated
luminosities of 2 ab at GeV and 4 ab at
GeV, the combined precision on the branching fraction of is estimated to be 17{\%}. The impact of the transverse
momentum resolution for this analysis is also studied.Comment: 21 pages, 10 figures, 11 tables. This work was carried out in the
framework of the ILD concept grou
A feasibility study of the measurement of Higgs pair creation at a Photon Linear Collider
We studied the feasibility of the measurement of Higgs pair creation at a
Photon Linear Collider (PLC). From the sensitivity to the anomalous
self-coupling of the Higgs boson, the optimum collision energy
was found to be around 270 GeV for a Higgs mass of 120 GeV/. We found that
large backgrounds such as and
, can be suppressed if correct assignment of tracks to parent
partons is achieved and Higgs pair events can be observed with a statistical
significance of by operating the PLC for 5 years.Comment: 7 pages, 8 figures, 5 table
A novel technique for the measurement of the avalanche fluctuation of gaseous detectors
We have developed a novel technique for the measurement of the avalanche
fluctuation of gaseous detectors using a UV laser. The technique is simple and
requires a short data-taking time of about ten minutes. Furthermore, it is
applicable for relatively low gas gains. Our experimental setup as well as the
measurement principle, and the results obtained with a stack of Gas Electron
Multipliers (GEMs) operated in several gas mixtures are presented.Comment: 7 pages, 7 figures. For the proceedings of VCI2016, to be published
in Nucl. Instrum. Methods Phys. Res.
A Time Projection Chamber with GEM-Based Readout
For the International Large Detector concept at the planned International
Linear Collider, the use of time projection chambers (TPC) with micro-pattern
gas detector readout as the main tracking detector is investigated. In this
paper, results from a prototype TPC, placed in a 1 T solenoidal field and read
out with three independent GEM-based readout modules, are reported. The TPC was
exposed to a 6 GeV electron beam at the DESY II synchrotron. The efficiency for
reconstructing hits, the measurement of the drift velocity, the space point
resolution and the control of field inhomogeneities are presented.Comment: 22 pages, 19 figure
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