0000000000604243
AUTHOR
B Lefebvre
Measurement of the Lund jet plane using charged particles in 13 TeV proton-proton collisions with the ATLAS detector
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 √s=13 TeV proton-proton collision data collected with the ATLAS detector using jets with transverse momentum above 675 GeV. The measurement uses charged particles to ac…
New Ordovician mitrates (Echinodermata, Stylophora) from the Ancenis Basin (South Armorican Domain, France): Palaeogeographic and palaeoenvironmental implications.
8 pages; International audience; Fossil echinoderms are extremely rare in Ordovician deposits of the South Armorican Domain (SAD), a structurally complex area stacked to the Medio-North Armorican Domain during the Hercynian orogeny. Two new occurrences of mitrate stylophorans are documented in the eastern part of the SAD (Ancenis Basin). The youngest known specimen of Lagynocystis pyramidalis is described from the Schistes du Fresne Formation (Late Ordovician). Mitrocystites mitra is reported from the Pierre Meliere Formation (Middle Ordovician), and for the first time, outside of Bohemia. The presence of these two cool-adapted taxa (both abundant in the Prague Basin) in the Ancenis Basin d…