ATLAS

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2018-02-20
15:01
OpenAccess [PUBDB-2018-01266] Book/Report/Dissertation / PhD Thesis
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Measurement of $Z$-boson production cross sections at √s = 13 TeV and $t\bar{t}$ to $Z$-boson cross-section ratios with the ATLAS detector at the LHC
[DESY-THESIS-2018-004]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS, 196 pp. (2018) [10.3204/PUBDB-2018-01266] = Dissertation, Universität Hamburg, 2018  GO
The measurement of $Z$-boson production cross sections in $pp$ collisions at centre-of-mass energy of √s = 13 TeV is presented. Results are based on data corresponding to an integrated luminosity of 3.16 fb$^{-1}$ recorded with the ATLAS detector in 2015 at the LHC operating with the 25 ns bunch spacing configuration. [...]
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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] ddc:530
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] ddc:530
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
ddc:610
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 / A 967, 281 - 284 (2017) [10.1016/j.nuclphysa.2017.04.043]  GO
ddc:530
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
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Impact of the heavy-quark matching scales in PDF fits
[DESY-17-101; arXiv:1707.05343] ddc:530
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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2018-01-11
14:54
[PUBDB-2018-00523] Journal Article
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Custom ultrasonic instrumentation for flow measurement and real-time binary gas analysis in the CERN ATLAS experiment
8th International Workshop on Semiconductor Pixel Detectors for Particles and Imaging, Meeting locationSestri Levante, Italy, 5 Sep 2016 - 9 Sep 20162016-09-052016-09-09 Journal of Instrumentation 12(01), C01091 (2017) [10.1088/1748-0221/12/01/C01091]  GO
ddc:610
The development of custom ultrasonic instrumentation was motivated by the need for continuous real-time monitoring of possible leaks and mass flow measurement in the evaporative cooling systems of the ATLAS silicon trackers. The instruments use pairs of ultrasonic transducers transmitting sound bursts and measuring transit times in opposite directions. [...]
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