Soft drop

We introduce a new jet substructure technique called "soft drop declustering", which recursively removes soft wide-angle radiation from a jet. The soft drop algorithm depends on two parameters -a soft threshold z cut and an angular exponent -with the = 0 limit corresponding roughly to the (modified) mass drop procedure. To gain an analytic understanding of soft drop and highlight the dependence, we perform resummed calculations for three observables on soft-dropped jets: the energy correlation functions, the groomed jet radius, and the energy loss due to soft drop. The = 0 limit of the energy loss is particularly interesting, since it is not only "Sudakov safe" but also largely insensitive to the value of the…

• UD
  U.S. Department of Energy

  Awards: DE-FG02-05ER-41360, DE-FG02-, DE-FG02-11ER-41741, DE-FG02
• AP
  Alfred P. Sloan Foundation
• AN
  Agence Nationale de la Recherche

  Awards: 009-01, ANR-10-CEXC-009-01, ANR-10
• SA
  Science and Technology Facilities Council