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A search for a new heavy neutral gauge boson at LHC

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A common theme in many beyond standard model theories is a presence of a new neutral gauge bosons (Z’) with mass at a TeV scale. They have been extensively searched for at the LHC. The most recent lower limit on the mass of the Z’ decaying to dileptons was set by the ATLAS experiment to be 5.1TeV (SSM model). The searches to date assume that a Z’ boson is produced through quark-anti-quark annihilation. But if the coupling of the Z’ boson to the SM quarks is small, the dominant production channel becomes vector-boson-fusion (VBF), to which the inclusive search does not have sensitivity and which might have eluded the detection up to now. Its signature is a resonance in the dilepton spectrum combined with a presence of two back-to-back jets in the event. The goal of this project is to do a basic data analysis to understand the reach of the search in the VBF production channel. This is a first search of this kind at the LHC.

o Level : Master 2 internship, can be followed by a PhD

o Date of the internship : spring 2020

o Supervisor : Tetiana Berger-Hryn’ova

o Phone : 04 50 09 16 24

o e-mail :

o Team members : C. Adam-Bourdarios, N. Berger, M. Delmastro, L. Di Ciaccio, C. Goy, T. Guillemin,T. Hryn’ova, S. Jézéquel, I. Koletsou, R. Lafaye, J. Lévêque, N. Lorenzo Martinez, E. Sauvan, I. Wingerter-Seez

Detailed description :