Measurement of the Soft-Drop Jet Mass in pp Collisions at root s = 13 TeV with the ATLAS Detector Aaboud, M. Aguilar Saavedra, Juan Antonio Atlas Collaboration Jet substructure observables have significantly extended the search program for physics beyond the standard model at the Large Hadron Collider. The state-of-the-art tools have been motivated by theoretical calculations, but there has never been a direct comparison between data and calculations of jet substructure observables that are accurate beyond leading-logarithm approximation. Such observables are significant not only for probing the collinear regime of QCD that is largely unexplored at a hadron collider, but also for improving the understanding of jet substructure properties that are used in many studies at the Large Hadron Collider. This Letter documents a measurement of the first jet substructure quantity at a hadron collider to be calculated at next-to-next-to-leading-logarithm accuracy. The normalized, differential cross section is measured as a function of log10ρ2, where ρ is the ratio of the soft-drop mass to the ungroomed jet transverse momentum. This quantity is measured in dijet events from 32.9 fb−1 of root s = 13 TeV protonproton collisions recorded by the ATLAS detector. The data are unfolded to correct for detector effects and compared to precise QCD calculations and leading-logarithm particle-level Monte Carlo simulations. 2019-11-19T08:57:31Z 2019-11-19T08:57:31Z 2018-08-28 info:eu-repo/semantics/article Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abidi, S. H., ... & Abreu, R. (2018). Measurement of the Soft-Drop Jet Mass in p p Collisions at s= 13 TeV with the ATLAS Detector. Physical review letters, 121(9), 092001. http://hdl.handle.net/10481/57966 10.1103/PhysRevLett.121.092001 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España American Physical Society