In situ calibration of large-radius jet energy and mass in 13TeVproton-proton collisions with the ATLAS detector

Authors：Aaboud M^*; Aad G; Abbott B; Abdinov O; Abeloos B; Abidi S H; Abou Zeid O S; Abraham N L; Abramowicz H; Abreu H; Abulaiti Y; Acharya B S; Adachi S; Adamczyk L; Adelman J; Adersberger M; Adye T; Affolder A A; Afik Y; Agheorghiesei C; Aguilar Saavedra J A; Ahmadov F; Aielli G; Akatsuka S; Akesson T P A; Akilli E; Akimov A V; Alberghi G L; Albert J; Albicocco P; Verzini M J Alconada; Alderweireldt S; Aleksa M; Aleksandrov I N; Alexa C; Alexander G; Alexopoulos T; Alhroob M; Ali B

Source：European Physical Journal C, 2019, 79(2): 135.

DOI：10.1140/epjc/s10052-019-6632-8

The response of the ATLAS detector to large-radius jets is measured in situ using 36.2 fb(-1) of root s = 13TeV proton-proton collisions provided by the LHC and recorded by the ATLAS experiment during 2015 and 2016. The jet energy scale is measured in events where the jet recoils against a reference object, which can be either a calibrated photon, a reconstructed Z boson, or a system of well-measured small-radius jets. The jet energy resolution and a calibration of forward jets are derived using dijet balance measurements. The jet mass response is measured with two methods: using mass peaks formed by W bosons and top quarks with large transverse momenta and by comparing the jet mass measured using the energy deposited in the calorimeter with that using the momenta of charged-particle tracks. The transverse momentum and mass responses in simulations are found to be about 2-3% higher than in data. This difference is adjusted for with a correction factor. The results of the different methods are combined to yield a calibration over a large range of transverse momenta (p(T)). The precision of the relative jet energy scale is 1-2% for 200 GeV < p(T) < TeV, while that of the mass scale is 2-10%. The ratio of the energy resolutions in data and simulation is measured to a precision of 10-15% over the same p(T) range.

• Institution
  香港中文大学; 山东大学; 清华大学; 中国地震局; 中国科学院; 香港大学; 南京大学; 香港科技大学; 香港理工大学; 上海交通大学