A Search For Z Gauge Bosons Decaying To Tau Antitau Pairs In Proton Proton Collisions With The Atlas Detector
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Search for Z' Bosons Decaying Into Tau Pairs in Pp Collisions at [raíz Cuadrada] S
| Author | : Carlos Felipe González Hernández |
| Publisher | : |
| Total Pages | : |
| Release | : 2018 |
| Genre | : |
| ISBN | : |
New heavy neutral gauge bosons, generically referred as Z0 bosons, are predicted in several theoretical scenarios beyond the standard model (BSM). In these kinds of scenarios, the breaking of extended symmetry usually results in an extra U(1)' symmetry group. This additional symmetry would give rise to the existence of a Z' boson with a mass that should be in the TeV scale. There are some scenarios that predict a generational coupling dependence, where the Z' boson would decay preferentially to the third generation of fermions, for instance, the topcolor-assisted technicolor (TAT) models. These scenarios are a motivation to search for Z' bosons decaying into tau pairs. The search for Z' decaying into tau-pairs involves four experimental signatures since the tau lepton can decay leptonically or hadronically. The dihadronic tau channel has the best sensitivity since it has the highest expected signal yield, but it has a high background contribution coming...
Measurement of the Z --] [tau] [tau] Production Cross-section in Proton-proton Collisions at [square Root Of] S
| Author | : Justin Griffiths |
| Publisher | : |
| Total Pages | : 137 |
| Release | : 2012 |
| Genre | : Large Hadron Collider (France and Switzerland) |
| ISBN | : |
The first measurement of the inclusive cross-section of the Z boson decaying to two tau leptons was measured with the ATLAS detector at the LHC. The data sample in this analysis represents an integrated luminosity of 35 pb ̄1 of proton-proton collisions at a center of mass energy of sqrt(s)=7 TeV. Separate measurements were performed in four decay modes based on how the two tau leptons decay: to hadrons and an electron, to hadrons and a muon, to an electron and a muon, and to two muons. In all four final states, inclusive cross-section measurements were made both in the fiducial region of the ATLAS detector where acceptance is high and in the full phase space, restricted to the mass range of [66, 116] GeV. The measurements from the four individual channels were then combined to yield the combined Z --> [tau] [tau] cross-section of 970 ± 70 (stat.) ± 60 (sys.) ± 30 (lumi.) pb.
Search for Heavy Resonances Decaying to Tau Lepton Pairs in Proton-proton Collisions at $\sqrt{s}$
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2016 |
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| ISBN | : |
A search for heavy resonances that decay to tau lepton pairs is performed using proton-proton collisions at \sqrt{s}$ = 13 TeV. The data were collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 2.2 inverse femtobarns. The observations are in agreement with standard model predictions. An upper limit at 95% confidence level on the product of the production cross section and branching fraction into tau lepton pairs is calculated as a function of the resonance mass. For the sequential standard model, the presence of Z' bosons decaying into tau lepton pairs is excluded for Z' masses below 2.1 TeV, extending previous limits for this final state. For the topcolor-assisted technicolor model, which predicts Z' bosons that preferentially couple to third-generation fermions, Z' masses below 1.7 TeV are excluded, representing the most stringent limit to date.
A Search for New Physics with High Mass Tau Pairs in Proton Anti-proton Collisions at S**1/2
| Author | : |
| Publisher | : |
| Total Pages | : 173 |
| Release | : 2005 |
| Genre | : |
| ISBN | : |
We present the results of a search for new particles decaying to tau pairs using the data corresponding to an integrated luminosity of 195 pb−1 collected from March 2002 to September 2003 with the CDF detector at the Tevatron. Hypothetical particles, such as Z' and MSSM Higgs bosons can potentially produce the tau pair final state. We discuss the method of tau identification, and show the signal acceptance versus new particle mass. The low-mass region, dominated by Z → [tau][tau], is used as a control region. In the high-mass region, we expect 2.8 ± 0.5 events from known background sources, and observe 4 events in the data sample. Thus no significant excess is observed, and we set upper limits on the cross section times branching ratio as a function of the masses of heavy scalar and vector particles.
A Search for New Physics with High Mass Tau Pairs in Proton Anti-proton Collisions at {u221A}s
| Author | : |
| Publisher | : |
| Total Pages | : 173 |
| Release | : 2005 |
| Genre | : |
| ISBN | : |
We present the results of a search for new particles decaying to tau pairs using the data corresponding to an integrated luminosity of 195 pb-1 collected from March 2002 to September 2003 with the CDF detector at the Tevatron. Hypothetical particles, such as Z' and MSSM Higgs bosons can potentially produce the tau pair final state. We discuss the method of tau identification, and show the signal acceptance versus new particle mass. The low-mass region, dominated by Z → ??, is used as a control region. In the high-mass region, we expect 2.8 ± 0.5 events from known background sources, and observe 4 events in the data sample. Thus no significant excess is observed, and we set upper limits on the cross section times branching ratio as a function of the masses of heavy scalar and vector particles.
Measurement of the W±Z Boson Pair-production Cross Section in Pp Collisions at [mml
| Author | : |
| Publisher | : |
| Total Pages | : 22 |
| Release | : 2016 |
| Genre | : |
| ISBN | : |
Here, the production of W±Z events in proton-proton collisions at a centre-of-mass energy of 13 TeV13 TeV is measured with the ATLAS detector at the LHC. The collected data correspond to an integrated luminosity of 3.2 fb-1. The W±Z candidates are reconstructed using leptonic decays of the gauge bosons into electrons or muons.
