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Louis Helary

Researcher at Heidelberg University

Publications -  945
Citations -  75714

Louis Helary is an academic researcher from Heidelberg University. The author has contributed to research in topics: Large Hadron Collider & Higgs boson. The author has an hindex of 125, co-authored 831 publications receiving 68545 citations. Previous affiliations of Louis Helary include University of Copenhagen & University of Gaziantep.

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Comparison of fragmentation functions for light-quark- and gluon-dominated jets from $pp$ and Pb+Pb collisions in ATLAS

Morad Aaboud, +2912 more
TL;DR: In this article, charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in $25$ pb$^{-1}$ of Pb+Pb collision data at $5.02$ TeV per nucleon pair with the ATLAS detector at the Large Hadron Collider.
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Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 $$\text {TeV}$$ with the ATLAS detector

Georges Aad, +2832 more
TL;DR: In this paper , the authors present a measurement of the electroweak production of two jets in association with a $Z\gamma$ pair, with the $Z$ boson decaying into two neutrinos.

Measurement of flow harmonics with multi-particle cumulants in Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV with the ATLAS detector

Georges Aad, +2885 more
Abstract: ATLAS measurements of the azimuthal anisotropy in lead–lead collisions at √ sNN = 2.76 TeV are shown using a dataset of approximately 7 μb−1 collected at the LHC in 2010. The measurements are performed for charged particles with transverse momenta 0.5 < pT < 20 GeV and in the pseudorapidity range |η| < 2.5. The anisotropy is characterized by the Fourier coefficients, vn , of the charged-particle azimuthal angle distribution for n = 2–4. The Fourier coefficients are evaluated using multi-particle cumulants calculated with the generating function method. Results on the transverse momentum, pseudorapidity and centrality dependence of the vn coefficients are presented. The elliptic flow, v2, is obtained from the two-, four-, sixand eight-particle cumulants while higher-order coefficients, v3 and v4, are determined with twoand four-particle cumulants. Flow harmonics vn measured with four-particle cumulants are significantly reduced compared to the measurement involving two-particle cumulants. A comparison to vn measurements obtained using different analysis methods and previously reported by the LHC experiments is also shown. Results of measurements of flow fluctuations evaluated with multiparticle cumulants are shown as a function of transverse momentum and the collision centrality. Models of the initial spatial geometry and its fluctuations fail to describe the flow fluctuations measurements.
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Search for the HH -> b(b)over-barb(b)over-bar process via vector-boson fusion production using proton-proton collisions at root s = 13 TeV with the ATLAS detector (vol 7, 108, 2020)

Georges Aad, +3020 more
- 22 Jan 2021 - 
TL;DR: In this paper, a wrong cross-section was used for the theory prediction in figure 6 due to not taking into account the VHH contamination properly in the rescaling formula for the signal samples.

Study of jets produced in association with a W boson in pp collisions at √s=7 TeV with the ATLAS detecto

Georges Aad, +2995 more