Search for Z' Production in 4b-tagged Jet Final States in Proton-Proton Collisions
Abstract
The LHCb experiment has reported discrepancies at a level of 3 sigma in the ratio in which B mesons decay to muons and electrons. Some theories attempt to explain these anomalies by theorizing the existence of new particles beyond the standard model, such as a new heavy neutrl gauge boson (Z ′ ) coupling mostly to third-generation fermions, specifically b-quarks.
This study performs a search for Z ′ boson at the LHC with the CMS experiment. The main production channel is b-quark fusion, and since the b-quark parton distribution functions (PDFs) are at least ten times lower when compared to the gluon PDFs, a substantial contribution of bottom quarks coming from gluon-splitting to Z ′ production is expected. In short, a study for Z ′ → b ¯b decays is presented. The final state consists of 4 b jets, with the two extra jets coming from the initial gluon splitting. Results correspond to 35.9 f b−1 of proton-proton collision data recorded by the CMS detector at the LHC with a center-of-mass-energy of 13 TeV during 2016.
Subject
high-energy physicslarge hadron collider
compact muon solenoid
jets
b-tagging
b-meson anomalies
beyond the standard model
Citation
Delgado, Andrea (2020). Search for Z' Production in 4b-tagged Jet Final States in Proton-Proton Collisions. Doctoral dissertation, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /191615.