arXiv subjects

Thomas G. McCarthy

Publications and source records attributed to Thomas G. McCarthy.

4 recordsLinked to original sources

arXiv2020

Measurements of the production of single top quarks or of top quark pairs in association with a W boson, a Z boson, or a photon with ATLAS $\&$ CMS

These proceedings highlight a selection of recent ATLAS and CMS measurements which target either the production of a single top quark or the associated production of a top-antitop quark pair together with a $W$ boson, a $Z$ boson, or a photon ($γ$). The highlighted analyses are based predominantly on proton-proton collision data collected by the two experiments during Run 2 of the LHC at a centre-of-mass energy of $\sqrt{s}=13$ TeV with datasets corresponding to integrated luminosities of up to 77.5 fb$^{-1}$. One combination of ATLAS and CMS single top quark measurements employing the full Run 1 dataset based on $\sqrt{s}=7,8$ TeV is also included. Such measurements probe the Standard Model couplings of top quarks to gauge bosons and offer sensitivity to a number of anomalous non-Standard-Model effects.

hep-ex↗

arXiv2018

SM+Top at the LHC

These proceedings highlight a selection of recent results by the ATLAS, CMS and LHCb collaborations. The majority of the featured analyses make use of the large set of $\sqrt{s}=13$ TeV proton-proton collision data collected during the successful second run of the LHC. A particular focus is placed on analyses of Standard Model processes involving either hadronic jets or W/Z bosons. Searches and cross-section measurements involving top quark signatures are also given prominence, as are those targeting highly boosted objects such as W/Z and H bosons, and which feature the use of large-radius jets and substructure techniques.

hep-ex↗

arXiv2016

Upgrade of the ATLAS Liquid Argon Calorimeters for the High-Luminosity LHC

The increased particle flux at the high luminosity phase of the Large Hadron Collider (HL-LHC), with instantaneous luminosities of up to 7.5 times the original design value, will have an impact on many sub-systems of the ATLAS detector. This contribution highlights the particular impacts on the ATLAS liquid argon calorimeter system, together with an overview of the various upgrade plans leading up to the HL-LHC. The higher luminosities are of particular importance for the forward calorimeters (FCal), where the expected increase in the ionization load poses a number of problems that can degrade the FCal performance such as beam heating and space-charge effects in the liquid argon gaps and high-voltage drop due to increased current drawn over the current-limiting resistors. A proposed FCal replacement as a way to counter some of these problems is weighed against the risks associated with the replacement. To further mitigate the effects of increased pile-up, the installation of a high-granularity timing detector at the front face of each end-cap cryostat is also currently under consideration. Several different sensor technologies and layouts are being investigated.

physics.ins-det↗

arXiv2016

Top Quark Mass Measurements at the LHC

This document highlights a number of top-quark mass measurements carried out by the ATLAS and CMS collaborations based on the combined LHC Run 1 datasets at centre-of-mass energies of $\sqrt{s}=$7 and 8 TeV. A wide range of analysis strategies are employed for a number of final-state signatures. Measurements of both the pole mass as well as the value of the top-quark mass as defined by the Monte Carlo generator in simulated signal samples are discussed.

hep-ex↗