A measurement of the soft-drop jet mass in pp collisions at √s = 13 TeV with the ATLAS detector

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Abraham, N L, Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Jones, S D, Lerner, G, Miano, F, Salvatore, F, Santoyo Castillo, I, Shaw, K, Shehu, C Y, Stevenson, T J, Suruliz, K, Sutton, M R, Tresoldi, F, Vivarelli, I, Winkels, E, Winston, O J, The ATLAS Collaboration, and others, (2018) A measurement of the soft-drop jet mass in pp collisions at √s = 13 TeV with the ATLAS detector. Physical Review Letters, 121 (9). 092001 1 -21. ISSN 0031-9007

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Abstract

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 log 10 ρ 2, 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 √s =13 TeV proton-proton 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Depositing User: Alice Jackson
Date Deposited: 19 Nov 2018 10:42
Last Modified: 02 Jul 2019 13:49
URI: http://sro.sussex.ac.uk/id/eprint/80203

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