Search results for "detectors"
showing 10 items of 2229 documents
Implementation of the ROD Crate DAQ Software for the ATLAS Tile Calorimeter and a Search for a MSSM Higgs Boson decaying into Tau pairs
2010
The ATLAS experiment of the LHC at CERN started its operation in 2009. The ROD Crate DAQ (RCD) as a part of the Trigger and Data Acquisition system (TDAQ) is responsible for the operation of the sub-‐detector specific hardware at the level of the back-‐end electronics crates. The RCD for the Tile Calorimeter is fully implemented. In first place, the specific Tile hardware and software is described in the configuration database. In second place, the various plug-‐ins for the RCD that make use of sophisticated programming techniques are characterized. The RCD performance can be evaluated in terms of global DAQ efficiency, which is over 94% for the considered period in 2010 and in terms of …
Sterile neutrinos as dark matter candidates
2021
In these brief lecture notes, we introduce sterile neutrinos as dark matter candidates. We discuss in particular their production via oscillations, their radiative decay, as well as possible observational signatures and constraints.
"Table 31" of "Search for photonic signatures of gauge-mediated supersymmetry in 8 TeV $pp$ collisions with the ATLAS detector"
2015
The total NLO cross sections with uncertainties for the electroweak production GGM signal grid for the photon+j analysis.
Dark matter search in the top-quark sector with the ATLAS detector at the LHC
2020
Astronomical and cosmological observations support the existence of invisible matter that can only be detected through its gravitational effects, thus making it very difficult to study. This component, called dark matter, makes up about 26.8\% of the known universe. Experiments at the LHC, located at CERN, search for new particles to be dark matter candidates. A dark matter production can consist of an excess of events with a single final-state object X recoiling against large amount of missing momentum of energy called mono-X signal. The studies presented in this thesis are focused on the mono-X signature, with X being a top quark, named mono-top. The topology is studied, where the $W$ bos…
Analysis of the Tile-Cal (ATLAS) prototypes and study of Higgs production in LHC
2000
Test de los prototipos del calorímetro hadrónico del detector ATLAS del CERN. Búsqueda del Bosón de Higgs desintegrándose a dos quarks tops, dentro del modelo MSSM en el detector ATLAS.
Irradiated silicon detectors for HL-LHC: Characterization and simulations
2012
283 páginas. Tesis Doctoral del Departamento de Física Atómica, Molecular y Nuclear, de la Universidad de Valencia. Fecha de lectura: 18 julio 2012.
SiPM based tracking for detector calibration in NEXT
2015
197 páginas. Tesis Doctoral del Departamento de Física Atómica, Molecular y Nuclear de la Universidad de Valencia y del Instituto de Física Corpuscular (IFIC).
ATLAS data quality operations and performance for 2015-2018 data-taking
2020
The ATLAS detector at the Large Hadron Collider reads out particle collision data from over 100 million electronic channels at a rate of approximately 100 kHz, with a recording rate for physics events of approximately 1 kHz. Before being certified for physics analysis at computer centres worldwide, the data must be scrutinised to ensure they are clean from any hardware or software related issues that may compromise their integrity. Prompt identification of these issues permits fast action to investigate, correct and potentially prevent future such problems that could render the data unusable. This is achieved through the monitoring of detector-level quantities and reconstructed collision ev…
Particle identification in ALICE: a Bayesian approach
2016
We present a Bayesian approach to particle identification (PID) within the ALICE experiment. The aim is to more effectively combine the particle identification capabilities of its various detectors. After a brief explanation of the adopted methodology and formalism, the performance of the Bayesian PID approach for charged pions, kaons and protons in the central barrel of ALICE is studied. PID is performed via measurements of specific energy loss ($\mathrm{d}E/\mathrm{d}x$) and time-of-flight. PID efficiencies and misidentification probabilities are extracted and compared with Monte Carlo simulations using high-purity samples of identified particles in the decay channels ${\rm K}^0_S \righta…
Observation and Measurement of Forward Proton Scattering in Association with Lepton Pairs Produced via the Photon Fusion Mechanism at ATLAS
2020
The observation of forward proton scattering in association with lepton pairs (eþe− þ p or μþμ− þ p) produced via photon fusion is presented. The scattered proton is detected by the ATLAS Forward Proton spectrometer, while the leptons are reconstructed by the central ATLAS detector. Proton-proton collision data recorded in 2017 at a center-of-mass energy of ffiffiffi s p ¼ 13 TeV are analyzed, corresponding to an integrated luminosity of 14.6 fb−1. A total of 57 (123) candidates in the ee þ p (μμ þ p) final state are selected, allowing the background-only hypothesis to be rejected with a significance exceeding 5 standard deviations in each channel. Proton-tagging techniques are introduced f…