High Energy Physics / Université catholique de Louvain / Louvain-la-Neuve


Top quarks: still there at 13 TeV!

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. Read more...
Top quarks: still there...
CP3 News Blog

Latest preprints

First measurement of the differential cross section for ttbar production in the dilepton final state at sqrt(s) = 13 TeV
CMS collaboration
[Full text] Physics Analysis Summary CMS-TOP-15-010
Public experimental note. 1st September.

Measurement of the top quark pair production cross section in proton-proton collisions at sqrt(s) = 13 TeV with the CMS detector
CMS collaboration
[Full text] Physics Analysis Summary CMS-TOP-15-003
Public experimental note. 1st September.

Simplifed Models for Exotic long-lived signatures
Loic Quertenmont, Jan Heisig, Andre Lessa
31st August.

The Physics Department at UCLouvain has been involved for a number of decades in high energy particle physics research, equally strongly on the experimental and instrumental fronts as on the theoretical one. In spite of being located in physically distinct places, all these activities are now brought together within a common organisational structure, the Centre for Cosmology, Particle Physics and Phenomenology (CP3). This structure reinforces the collaboration of these varied components and competences in the physics of the fundamental interactions and the elementary particles.

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