ATLAS

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2018-04-11
17:53
OpenAccess [PUBDB-2018-01693] Conference Presentation

Searches for exotic Higgs bosons at ATLAS and CMS
53rd Rencontres de Moriond 2018: QCD and High Energy Interactions, Moriond 2018, Meeting locationLa Thuile, Italy, 17 Mar 2018 - 24 Mar 20182018-03-172018-03-24  GO
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2018-03-19
09:19
OpenAccess [PUBDB-2018-01500] Preprint/Report
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QCD analysis of the ATLAS and CMS $\mathrm{W^{\pm}}$ and $Z$ cross-section measurements and implications for the strange sea density
[DESY-18-021; arXiv:1803.00968]
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In the present paper, the ATLAS inclusive $W^{\pm}$ and $Z$ boson production data are analysed together with the CMS inclusive $W^{\pm}$ and $Z$ boson production data to investigate any possible tensions between the data sets and to determine the strange sea fraction, within the framework of a parton distribution function fit at next-to-next-to leading order in perturbative QCD..
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2018-02-13
14:50
OpenAccess [PUBDB-2018-01172] Dissertation / PhD Thesis
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Measurement of the fiducial differential Higgs cross-section with respect to pT using the diphoton decay channel atps = 8TeV with ATLAS
191 pp. (2018) [10.3204/PUBDB-2018-01172] = Dissertation, University of Hamburg, 2017  GO
AbstractThis thesis presents a measurement of the fiducial differential cross-section with respect to pT of Higgs boson production, using the diphoton decay channel. Theanalysis uses 20:3 fb-1 of proton-proton collision data at a centre-of-mass energy of 8TeV taken with the ATLAS detector in the year 2012. [...]
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2018-02-12
08:27
OpenAccess [PUBDB-2018-01147] Report
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Electron and photon reconstruction and performance in ATLAS using a dynamical, topological cell clustering-based approach
[ATL-PHYS-PUB-2017-022]
This note presents the reconstruction of electrons and photons in ATLAS using a dynamic,topological cell clustering-based approach. This new technique allows for improved meas-urements of electron and photon energies, particularly in situations where an electron radiatesa bremsstrahlung photon, or a photon converts to an electron-positron pair. [...]
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2018-01-18
12:04
OpenAccess [PUBDB-2018-00689] Dissertation / PhD Thesis

Measurements of top-quark properties at 8 TeV using the ATLAS detector at the LHC
229 pp. (2017) [10.3204/PUBDB-2018-00689] = Dissertation, Bergische Universität Wuppertal, 2017  GO
This work presents the measurements of the charge asymmetry and top quark spin observables in ttbar events based on 20.3 fb$^{-1}$ of $\sqrt{s}$ = 8 TeV proton--proton collisions recorded with the ATLAS detector at the LHC. These analyses are performed in the dilepton final state, characterized by the presence of two isolated leptons (electrons or muons). [...]
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2018-01-16
10:32
OpenAccess [PUBDB-2018-00661] Report/Journal Article
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Measurement of differential cross sections of isolated-photon plus heavy-flavour jet production in pp collisions at $\sqrt{s}=8$ TeV using the ATLAS detector
[CERN-EP-2017-217; arXiv:1710.09560]
This Letter presents the measurement of differential cross sections of isolated prompt photons produced in association with a b-jet or a c-jet. These final states provide sensitivity to the heavy-flavour content of the proton and aspects related to the modelling of heavy-flavour quarks in perturbative QCD. [...]
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2018-01-16
10:22
OpenAccess [PUBDB-2018-00660] Report/Journal Article
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Search for dark matter produced in association with bottom or top quarks in $\sqrt{s}$ = 13 TeV pp collisions with the ATLAS detector
[CERN-EP-2017-229; arXiv:1710.11412]
A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. [...]
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2018-01-11
16:47
OpenAccess [PUBDB-2018-00559] Journal Article
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Radiation hardness studies of AMS HV-CMOS 350 nm prototype chip HVStripV1
CMOS active pixel sensors are being investigated for their potential use in the ATLAS inner tracker upgrade at the HL-LHC. The new inner tracker will have to handle a significant increase in luminosity while maintaining a sufficient signal-to-noise ratio and pulse shaping times. [...]
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2018-01-11
16:20
OpenAccess [PUBDB-2018-00550] Journal Article
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Electromagnetic processes in ultra-peripheral Pb+Pb collisions with ATLAS
26th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Meeting locationChicago, Illinois, USA, 6 Feb 2017 - 11 Feb 20172017-02-062017-02-11 Nuclear physics <Amsterdam> / A 967, 281 - 284 (2017) [10.1016/j.nuclphysa.2017.04.043]  GO
The large equivalent-photon fluxes accompanying Pb ion beams at the LHC initiate photon–photon interactions, which occur when the colliding nuclei have large impact parameter (ultra-peripheral collisions). The ATLAS collaboration has carried out a range of measurements related with two-photon interactions at high energies using recently recorded Pb+Pb collision data taken at sNN=5.02 TeV ..
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2018-01-11
15:27
OpenAccess [PUBDB-2018-00530] Report/Journal Article
; ; ; et al
Impact of the heavy-quark matching scales in PDF fits
[DESY-17-101; arXiv:1707.05343]
We investigate the impact of displaced heavy-quark matching scales in a global fit. The heavy-quark matching scale $μ_m$ determines at which energy scale $μ$ the QCD theory transitions from NF to $N_{F}+1$ in the variable flavor number scheme (VFNS) for the evolution of the parton distribution functions (PDFs) and strong coupling $\alpha_{S}(μ)$. [...]
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