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


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Most precise measurement of the Z+b-jets process

For the first time, the Z+b-jets process has been measured as a function of the b-jet multiplicity. In line with the spirit of CP3, the analysis benefited from direct interaction between experimentalists and phenomenologists, and members of CP3 have significantly contributed to this study, e.g. to the identification of b jets, as well as the background estimates using MadWeight. The CMS measurements are used to test various predictions from event generators, a.o. MadGraph and aMC@NLO, that both have been partially developed at CP3, and data favour the predictions in the five-flavour scheme, where b quarks are assumed massless. Furthermore, kinematic properties of the reconstructed particles in the Z+bb final state are tested, which is of interest for studies of the H-boson in the H->bb decay, as well as in searches for extensions of the Standard Model. Read more...
Most precise measurement...
CP3 News Blog


Latest preprints

Top-quark mass effects in double and triple Higgs production in gluon-gluon fusion at NLO
F. Maltoni, E. Vryonidou, M. Zaro
Refereed paper. 27th August.

Measurement of the Michel Parameter xi" in Polarized Muon Decay and Implications on Exotic Couplings of the Leptonic Weak Interaction
R. Prieels, O. Naviliat-Cuncic, P. Knowles, P. Van Hove, X. Morelle, J. Egger, J. Deutsch, J. Govaerts, W. Fetscher, K. Kirch, and J. Lang
[Abstract] [PDF] 15 pages, 16 figures, 3 tables, submitted to Phys. Rev. D
Refereed paper. 8th August.

Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
by Federico Demartin, Fabio Maltoni, Kentarou Mawatari, Ben Page, Marco Zaro
19 pages to be submitted to EPJC.
Refereed paper. 18th July.


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.



[UCLouvain] - [SST] [IRMP] - [SC] [PHYS]
Contact : Vincent Boucher & Jérôme de Favereau
Job opportunities Phd Research Position in Experimental Particle Physics (CMS experiment) - supervisor: Andrea Giammanco
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