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Durham University

Centre for Particle Theory

Research Staff

Publication details for Mikael Chala

Chala, Mikael & Spannowsky, Michael (2018). Behavior of composite resonances breaking lepton flavor universality. Physical Review D 98(3): 035010.

Author(s) from Durham

Abstract

Within the context of composite Higgs models, recent hints on lepton flavor nonuniversality in
B
decays can be explained by a vector resonance
V
with sizeable couplings to the Standard Model leptons (

). We argue that, in such a case, spin-
1
/
2
leptonic resonances (
L
) are most probably light enough to open the decay mode
V

L

. This implies, in combination with the fact that couplings between composite resonances are much larger than those between composite and elementary fields, that this new decay can be important. In this paper, we explore under which conditions it dominates over other decay modes. Its discovery, however, requires a dedicated search strategy. Employing jet substructure techniques, we analyze the final state with largest branching ratio, namely
μ
+
μ

Z
/
h
,
Z
/
h

jets. We show that (i) parameter space regions that were believed excluded by dimuon searches are still allowed, (ii) these regions can already be tested with the dedicated search we propose and (iii)
V
masses as large as

3.5


TeV
can be probed at the LHC during the high-luminosity phase.