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The large top-quark samples collected with the ATLAS experiment at the LHC have yielded measurements of the inclusive \ttbar production cross section of unprecedented precision and differential measurements in new kinematic regimes.They…

High Energy Physics - Experiment · Physics 2023-08-28 Benedikt Gocke

The first collisions of lead nuclei, delivered by the CERN Large Hadron Collider (LHC) at the end of 2010, at a centre-of-mass energy per nucleon pair $\sqrt{s_{NN}}$ = 2.76 TeV, marked the beginning of a new era in ultra-relativistic…

High Energy Physics - Experiment · Physics 2017-02-24 Panagiota Foka , Malgorzata Anna Janik

The Large Hadron-electron Collider LHeC is a proposed upgrade of the LHC. It would add an electron beam to the LHC, and make it possible to study electron-proton and electron-nucleus collisions at very high energies. We present some of the…

High Energy Physics - Phenomenology · Physics 2018-11-16 Heikki Mäntysaari

There have been several important recent developments in precision electroweak tests. These include: the new LEP energy scan during the 1993 run; the first high-precision results on the left-right asymmetry from the SLD Collaboration at…

High Energy Physics - Phenomenology · Physics 2007-05-23 Paul Langacker

We discuss the physics of large impact parameter interactions at the LHC: ultraperipheral collisions (UPCs). The dominant processes in UPCs are photon-nucleon (nucleus) interactions. The current LHC detector configurations can explore small…

First searches for new physics phenomena using the LHC 7 TeV proton-proton collision data collected by the CMS detector in 2010 are reviewed. Results are presented of searches for new physics in events with hadronic jet pairs, and for heavy…

High Energy Physics - Experiment · Physics 2015-05-27 Paolo Azzurri

Using the data collected during Run I of LHC operation the CMS Collaboration performed multiple analyses searching for the direct electroweak production of supersymmetric particles in proton-proton collisions. Different decay modes of the…

High Energy Physics - Experiment · Physics 2014-09-15 Pieter Everaerts

This paper presents the electron and photon energy calibration obtained with the ATLAS detector using about 36 fb$^{-1}$ of LHC proton-proton collision data recorded at $\sqrt{s}=13$ TeV in 2015 and 2016. The different calibration steps…

High Energy Physics - Experiment · Physics 2019-03-21 ATLAS Collaboration

The ATLAS detector is capable of resolving the highest energy pp collisions at luminosities sufficient to yield 10's of simultaneous interactions within a bunch collision lasting <0.5 nsec. Already in 2011 a mean occupancy of 20 is often…

High Energy Physics - Experiment · Physics 2015-06-03 Sebastian N. White

Two-photon events at the LHC are characterized by the protons scattered at very small angles and the particles centrally produced via the photon-photon fusion. To select these events from the huge samples of generic pp interactions a…

High Energy Physics - Experiment · Physics 2017-08-23 K. Piotrzkowski

Top quark production in association with a photon offers a unique test ground for the standard model predictions, as it is sensitive to the top-photon coupling. These processes are rare when compared to standard top pair production, however…

High Energy Physics - Experiment · Physics 2026-02-04 Beatriz Ribeiro Lopes

A promising avenue to perform precision tests of the SM at the LHC is to measure differential cross-sections at high invariant mass, exploiting in this way the growth with the energy of the corrections induced by heavy new physics. We…

High Energy Physics - Phenomenology · Physics 2018-06-11 Roberto Franceschini , Giuliano Panico , Alex Pomarol , Francesco Riva , Andrea Wulzer

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…

High Energy Physics - Experiment · Physics 2020-01-08 Thomas G. McCarthy

In diffractive interactions of protons or nuclei a violent collision can occur that leaves the forward going particle completely intact -with probability determined by the structure of the proton or nucleus. At very high energies these…

Nuclear Experiment · Physics 2015-05-18 Sebastian White

The Large Hadron Collider is an ideal place for precision measurements of the properties of the electroweak gauge bosons W^\pm, Z^0, as well as of the top quark. In this article, a few highlights of the prospects for performing such…

High Energy Physics - Experiment · Physics 2007-06-21 F. -P. Schilling

A short run of proton-oxygen and oxygen-oxygen collisions is planned to take place at the Large Hadron Collider during LHC Run 3. The primary goal of this run is to improve the modeling of Cosmic-Ray interactions and to reduce the…

High Energy Physics - Experiment · Physics 2023-08-08 Michael Pitt

In central collisions at relativistic heavy ion colliders like the Relativistic Heavy Ion Collider RHIC/Brookhaven and the Large Hadron Collider LHC (in its heavy ion mode) at CERN/Geneva, one aims at detecting a new form of hadronic matter…

Nuclear Theory · Physics 2009-10-31 Gerhard Baur , Kai Hencken , Dirk Trautmann

The top-quark is a fundamental element of the physics program at the Large Hadron Collider (LHC). We review the current status of the top-quark measurements performed by ATLAS and CMS experiments in pp collisions at sqrt(s)=7 TeV by…

High Energy Physics - Experiment · Physics 2012-01-31 Luca Fiorini

The discovery of a new type of a heavy long-lived particle (LLP) would be of fundamental significance due to their existence in many beyond the Standard Model scenarios. LLPs are anticipated in a wide range of physics models which extend…

High Energy Physics - Experiment · Physics 2019-08-13 Paul D. Jackson

Many of the interesting physics processes to be measured at the LHC have a signature involving one or more isolated electrons. The electron reconstruction and identification efficiencies of the ATLAS detector at the LHC have been evaluated…

High Energy Physics - Experiment · Physics 2014-07-23 ATLAS Collaboration