57 research outputs found
ATLAS results on charmonium production and production and decays
No full textRecent results from the ATLAS experiment at the LHC on the charmonium production
and on the production and decays are presented.
These include studies of the associated production of the meson and boson,
the measurement of and mesons differential production cross-sections,
the measurement of the differential ratios of the and production cross-sections,
and the new results on the decays to final states.
The results are obtained with collision data collected at centre-of-mass energies and 13 TeV
Searches for new physics with heavy flavour at ATLAS
No full textThe FCNC processes are sensitive of NP contributions, in particular through additional electroweak loop amplitudes. The angular analysis of the decay of is presented. A number of angular coefficients are measured as a function of the invariant mass squared of the di-muon system for data collected by ATLAS at TeV. Comparison is made to theoretical predictions, including for the observable , for which there has been recent tension between theory and experiment. ATLAS results on the study of the rare decay is also presented
ATLAS results on charmonium production and production and decays
No full textRecent results from the ATLAS experiment on the charmonium production and on the production and decays are presented. These include studies of the associated production of the meson and boson, the measurement of and differential cross sections, the measurement of the differential ratios of the and production cross sections, and the new results on the decays to final states. The results are obtained with collision data collected at centre-of-mass energies and 13 TeV
Распады мезона и поиск редкого распада в эксперименте ATLAS
No full textThe PhD thesis is dedicated to a study of heavy hadrons in the ATLAS experiment at the Large Hadron Collider. It presents a measurement of the branching ratios of the meson decays, and , using another decay, , for normalization. Polarization of daughter particles in the decay is also measured. The study was performed with data collected by ATLAS in collisions at centre-of-mass energies and 8 TeV in 2011--2012. The thesis also describes a study on search for the rare decay with ATLAS data of collisions at ~TeV. An upper limit on the decay branching ratio is set. Author's principal contribution to this study was developing a method to estimate a background from neutral meson decays to a pair of light charged hadrons ()
Recent heavy-flavour results from ATLAS
No full textRecent heavy-flavour results of the ATLAS experiment at LHC are presented. These include studies of charmonium production, searches for exotic states in four-muon final state and measurement of decay effective lifetime. Most of the results are obtained with collision data collected at a centre-of-mass energy of TeV
Muon and B-physics trigger of the ATLAS experiment in Run 2
No full textThis paper presents an overview of muon trigger and B-physics trigger of the ATLAS experiment. Main updates done during the preparation for Run 2 data-taking are outlined. Trigger performance results obtained with new experimental data and modelling are shown
Search for a CP-odd Higgs boson decaying to Zh in pp collisions at root s=8 TeV with the ATLAS detector
No full textSee paper for full list of authors – 13 pages plus author list + cover pages (30 pages total), 5 figures, 2 tables, submitted to Phys. Lett. B, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-06/International audienceA search for a heavy, CP-odd Higgs boson, , decaying into a boson and a 125 GeV Higgs boson, , with the ATLAS detector at the LHC is presented. The search uses proton--proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb. Decays of CP-even bosons to or pairs with the boson decaying to electron or muon pairs are considered, as well as decays with the boson decaying to neutrinos. No evidence for the production of an boson in these channels is found and the 95% confidence level upper limits derived for \sigma (gg\rightarrow A) \times \mbox{BR}(A \rightarrow Zh) \times \mbox{BR}(h \rightarrow f\bar{f}) are 0.098--0.013 pb for and 0.57--0.014 pb for in a range of 220--1000 GeV. The results are combined and interpreted in the context of two-Higgs doublet models
Author Correction: A detailed map of Higgs boson interactions by the ATLAS experiment ten years after the discovery
No full textIn the version of this article initially published, the ATLAS Collaboration
author names, affiliations and acknowledgements were omitted and
have now been included in the HTML and PDF versions of the article
Search for W ' -> t(b)over-bar in the lepton plus jets final state in proton-proton collisions at a centre-of-mass energy of root s=8 TeV with the ATLAS detector
No full textA search for new charged massive gauge bosons, called W', is performed with the ATLAS detector at the LHC, in proton-proton collisions at a centre-of-mass energy of root s = 8 TeV, using a dataset corresponding to an integrated luminosity of 20.3 fb(-1). This analysis searches for W' bosons in the W' -> t (b) over tilde decay channel in final states with electrons or muons, using a multivariate method based on boosted decision trees. The search covers masses between 0.5 and 3.0 TeV, for right-handed or left-handed W' bosons. No significant deviation from the Standard Model expectation is observed and limits are set on the W' -> t (b) over bar cross-section times branching ratio and on the W'-boson effective couplings as a function of the W'-boson mass using the CLs procedure. For a left-handed (right-handed) W' boson, masses below 1.70 (1.92) TeV are excluded at 95% confidence level.ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1016/j.physletb.2015.02.051</p
- …
