Publications by authors named "A Kugel"
The first measurement of longitudinal decorrelations of harmonic flow amplitudes v_{n} for n=2-4 in Xe+Xe collisions at sqrt[s_{NN}]=5.44 TeV is obtained using 3 μb^{-1} of data with the ATLAS detector at the LHC. The decorrelation signal for v_{3} and v_{4} is found to be nearly independent of collision centrality and transverse momentum (p_{T}) requirements on final-state particles, but for v_{2} a strong centrality and p_{T} dependence is seen.
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- - A study was conducted at CERN's LHC to search for decays of the Higgs boson into a Z boson and a light resonance, using data from proton-proton collisions at a total energy of 13 TeV.
- - The light resonance considered in the study could either be a new light boson under 4 GeV or a charmonium state, and sophisticated techniques were used to select events and measure masses.
- - The results showed no significant excess of events, leading to the establishment of upper limits on the Higgs boson production rate, ranging from 17 to 340 picobarns for various mass hypotheses, and specific limits for two charmonium states (η_{c} and J/
Article Synopsis
- The research conducted uses data from LHC Run 2, specifically analyzing proton-proton collisions at a high energy of 13 TeV to search for heavy neutral Higgs bosons using the ATLAS detector.
- The focus is on the τ^{+}τ^{-} decay channel over a mass range of 0.2-2.5 TeV, and results show that the observed data aligns well with the expected background from the standard model.
- In the context of the minimal supersymmetric standard model, certain values of tanβ are excluded at a 95% confidence level for Higgs boson masses of 1.0 and 1.5 TeV, indicating restricted parameter space for this theoretical model.
The prevalence of hadronic jets at the LHC requires that a deep understanding of jet formation and structure is achieved in order to reach the highest levels of experimental and theoretical precision. There have been many measurements of jet substructure at the LHC and previous colliders, but the targeted observables mix physical effects from various origins. Based on a recent proposal to factorize physical effects, this Letter presents a double-differential cross-section measurement of the Lund jet plane using 139 fb^{-1} of sqrt[s]=13 TeV proton-proton collision data collected with the ATLAS detector using jets with transverse momentum above 675 GeV.
View Article and Find Full Text PDFThe elliptic flow of muons from the decay of charm and bottom hadrons is measured in pp collisions at sqrt[s]=13 TeV using a data sample with an integrated luminosity of 150 pb^{-1} recorded by the ATLAS detector at the LHC. The muons from heavy-flavor decay are separated from light-hadron decay muons using momentum imbalance between the tracking and muon spectrometers. The heavy-flavor decay muons are further separated into those from charm decay and those from bottom decay using the distance-of-closest-approach to the collision vertex.
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