1,720,989 research outputs found
Searches for a high-mass Higgs boson produced in ppbar collisions at sqrt{s}=1.96 TeV
No full textIn this Thesis the electro-weak spontaneous symmetry breaking of the
Standard Model (SM) is studied by searching for the scalar Higgs particle
in the proton antiproton collisions of the Tevatron collider,
at the center of mass energy TeV.
We report on the inclusive search for the Higgs boson
%produced in all processes with significant production rate and
decaying to two bosons in the final state characterized by two charged leptons ( or ) and two neutrinos.
% in collisions at a center of mass energy TeV.
The analysis of 4.8\ifb of data recorded by the Collider Detector at Fermilab (CDF)
shows no evidence of its production. We set 95\% Confidence Level upper limits
on the production cross section as a function of the mass in the range
to 200\gev/c^2.
For m_H=165\gev/c^2 the observed limit is 1.3 times the SM predicted
cross section (); the expected limit, in absence of signal, is .
These limits are the most stringent ones set by a single experiment up to date, for m_H > 130\gev/c^2.In questa Tesi \`e studiato il meccanismo di rottura spontanea di simmetria
del Modello Standard attraverso la ricerca della particella scalare di Higgs
in collisioni protone antiprotone di Tevatron, ad un'energia del centro di massa TeV.
Presentiamo la ricerca inclusiva del bosone di Higgs
%per mezzo di tutti i processi di produzione
%predetti con sezione d'urto significativa a Tevatron,
nel decadimento e con stato finale costituito da due leptoni carichi ( o ) e due neutrini.
L'analisi effettuata su 4.8\ifb di dati raccolti dall'esperimento Collider Detector at Fermilab (CDF)
non mostra alcuna evidenza della sua produzione. Sono quindi calcolati
i limiti al 95\% di Livello di Confidenza sulla sezione d'urto
di produzione di tale particella, in funzione della sua massa , nell'intervallo
tra e 200\gev/c^2.
Per m_H=165\gev/c^2 il limite osservato \`e 1.3 volte la sezione d'urto
predetta dal Modello Standard (), ed il limite atteso in assenza di segnale
\`e .
I risultati mostrati in questa Tesi sono, ad oggi, i pi\`u stringenti limiti ottenuti
da un singolo esperimento sulla produzione del bosone di Higgs
per m_H > 130\gev/c^2
Perspectives on the determination of systematic uncertainties at HL-LHC
No full textThis presentation outlines the strategy on the usage of systematic uncertainties for HL-LHC projections, in the context of the CERN HL-/HE-LHC Yellow Report. The presentation is expected to be delivered on Jun 19th, at the "Workshop on the physics of HL-LHC, and perspectives at HE-LHC"
Highlights from ATLAS and CMS
No full textHighlights from ATLAS and CMS. Talk at the AWLC17 conference
New developments in track reconstruction for the ATLAS experiment for Run-2 of the LHC
No full textRun-2 of the LHC has provided new challenges to track and vertex reconstruction with higher energies, denser jets and higher rates. In addition, the Insertable B-layer (IBL) is a fourth pixel layer, which has been inserted at the centre of ATLAS during the shutdown of the LHC. We will present results showing the performance of the track and vertex reconstruction algorithm using Run-2 data at the LHC, highlighting the improvements to track reconstruction developed during the two year shutdown of the LHC. These include novel techniques developed to improve the performance in the dense cores of jets, optimisation for the expected conditions, and a big software campaign which lead to a factor of three decrease in the CPU time needed to process each recorded event
Searches for BSM physics using challenging and long-lived signatures with the ATLAS detector
No full textReview of recent ATLAS results on searches for BSM physics using challenging and long-lived signatures with the ATLAS detector. Talk at Lake Louise Winter Conference 2023
Highlights from the ATLAS experiment at the LHC
No full textPlenary talk at national meeting "Brookhaven Forum 2017: In search of New Paradigms
Prospects for QCD, EW and Top Physics at the HL-LHC
No full textSlides for the DIS-2021 virtual conferenc
Searches for BSM physics using challenging and long-lived signatures with the ATLAS detector
No full textVarious theories beyond the Standard Model predict new, long-lived particles with unique signatures which are difficult to reconstruct and for which estimating the background rates is also a challenge. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with fractional or multiple values of the charge of the electron or high mass stable charged particles are all examples of experimentally demanding signatures. The talk will focus on the most recent results using 13 TeV pp collision data collected by the ATLAS detector
Searches for Long-Lived Particles in ATLAS
No full textThe talk looks into challenges and opportunities for long-lived particle searches at the HL-LHC. It is intended to be presented at a kick-off workshop
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