472 research outputs found
Hadronic Cross Section Measurements on the Z Resonance with the L3 Detector
No full textContains fulltext :
mmubn000001_172668549.pdf (Publisher’s version ) (Open Access)Promotores : R. Van de Walle, E. Kittel en G. Bobbink113 p
Exploring the scalar sector: challenges & opportunities for Run 3 and HL-LHC
No full textThis presentation discusses notable opportunities that the upcoming deluge of LHC promises to offer, as pertaining to the physics of the scalar sector, and the challenges that go hand in hand with it
The ATLAS High-Granularity Timing Detector for the HL-LHC
No full textThe increase of the particle flux (pile-up) at the HL-LHC with instantaneous luminosities up to L ≃ 7.5 × 10 cms will have a severe impact on the ATLAS detector reconstruction and trigger performance. The end-cap and forward region where the liquid Argon calorimeter has coarser granularity and the inner tracker has poorer momentum resolution will be particularly affected. A High Granularity Timing Detector (HGTD) will be installed in front of the LAr endcap calorimeters for pile-up mitigation and luminosity measurement. The HGTD is a novel detector introduced to augment the new all-silicon Inner Tracker in the pseudo-rapidity range from 2.4 to 4.0, adding the capability to measure charged-particle trajectories in time as well as space. Two silicon-sensor double-sided layers will provide precision timing information for minimum-ionising particles with a resolution as good as 30 ps per track in order to assign each particle to the correct vertex. Readout cells have a size of 1.3 mm × 1.3 mm, leading to a highly granular detector with ~3.7 million channels. Low Gain Avalanche Detectors (LGAD) technology has been chosen as it provides enough gain to reach the large signal over noise ratio needed. The requirements and overall specifications of the HGTD will be presented as well as the technical design and the project status. The R&D effort carried out to study the sensors, the readout ASIC, and the other components, supported by laboratory and test beam results, will also be presented
Observation of an excess in the search for the Standard Model Higgs boson in the H →WW(*)→lνlν decay mode with the ATLAS detector
No full textAbstract: A Higgs boson search in the H->WW->lnulnu decay mode has been performed using proton-proton collision data collected in 2011 and 2012 with the ATLAS detector. An excess of events is observed consistent with the presence of a Standard Model Higgs boson with a mass of approximately 125 GeV. The observed p-value at a mass of 125 GeV is 3 times 10-3 (corresponding to a significance of 2.8 σ), while the expected p-value and significance are 0.01 and 2.3 σ, respectively
Measurement of Higgs couplings to fermions using the ATLAS detector
No full textThis conference contribution details recent measurements of , , and
A High-Granularity Timing Detector for the ATLAS Phase-II upgrade
No full textThe increase of the particle flux (pile-up) at the HL-LHC with instantaneous luminosities up to L ≃ 7.5 × 1034 cm−2s−1 will have a severe impact on the ATLAS detector reconstruction and trigger performance. The end-cap and forward region where the liquid Argon calorimeter has coarser granularity and the inner tracker has poorer momentum resolution will be particularly affected. A High Granularity Timing Detector (HGTD) will be installed in front of the LAr end-cap calorimeters for pile-up mitigation and luminosity measurement. The HGTD is a novel detector introduced to augment the new all-silicon Inner Tracker in the pseudo-rapidity range from 2.4 to 4.0, adding the capability to measure charged-particle trajectories in time as well as space. Two silicon-sensor double-sided layers will provide precision timing information for minimum-ionising particles with a resolution as good as 30 ps per track in order to assign each particle to the correct vertex. Readout cells have a size of 1.3 mm × 1.3 mm, leading to a highly granular detector with 3.7 million channels. Low Gain Avalanche Detectors (LGAD) technology has been chosen as it provides enough gain to reach the large signal over noise ratio needed. The requirements and overall specifications of the HGTD will be presented as well as the technical design and the project status. The on-going R&D effort carried out to study the sensors, the readout ASIC, and the other components, supported by laboratory and test beam results, will also be presented
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