In occasion of the EPS-HEP conference, to demonstrate the good performance of the detector at the Run-II start-up, the CMS collaboration has released the first illustrative event displays and distributions of observables designed to study top-quark events.
The data set consists of the first 41 inverse picobarns of proton-proton collisions recorded by the CMS detector at a center-of-mass energy of 13 TeV with a magnetic field of 3.8 Tesla in the solenoid, during the LHC development run with a bunch spacing of 50 ns that took place in July 2015.
Although the first quantitative statements will only be released later, these very early data already demonstrate unambiguous presence of the top-quark pair signal (also confirmed at the same conference by the ATLAS collaboration with 6 inverse picobarns) and early hints of single top. CP3 members are involved in these early studies.
By Andrea Giammanco on July 24, 2015