Physics Letters B 763 (2016) 269–274
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
Constraining flavor changing interactions from LHC Run-2 dilepton
bounds with vector mediators
Farinaldo S. Queiroz
a,∗
, Clarissa Siqueira
b
, José W.F. Valle
c
a
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
b
Departamento de Física, Universidade Federal da Paraíba, Caixa Postal 5008, 58051-970, João Pessoa, PB, Brazil
c
AHEP Group, Instituto de Física Corpuscular, C.S.I.C., Universitat de Valencia Edificio de Institutos de Paterna, C/Catedratico José Beltran, 2, E-46980 Paterna,
Valencia, Spain
a r t i c l e i n f o a b s t r a c t
Article history:
Received
2 September 2016
Received
in revised form 17 October 2016
Accepted
24 October 2016
Available
online 27 October 2016
Editor:
A. Ringwald
Within the context of vector mediators, is a new signal observed in flavor changing interactions,
particularly in the neutral mesons systems K
0
−
¯
K
0
, D
0
−
¯
D
0
and B
0
−
¯
B
0
, consistent with dilepton
resonance searches at the LHC? In the attempt to address this very simple question, we discuss the
complementarity between flavor changing neutral current (FCNC) and dilepton resonance searches at
the LHC run 2 at 13 TeV with 3.2fb
−1
of integrated luminosity, in the context of vector mediators at
tree level. Vector mediators, are often studied in the flavor changing framework, specially in the light of
the recent LHCb anomaly observed at the rare B decay. However, the existence of stringent dilepton
bound severely constrains flavor changing interactions, due to restrictive limits on the Z
mass. We
discuss this interplay explicitly in the well motivated framework of a 3-3-1 scheme, where fermions
and scalars are arranged in the fundamental representation of the weak SU(3) gauge group. Due to the
paucity of relevant parameters, we conclude that dilepton data leave little room for a possible new
physics signal stemming from these systems, unless a very peculiar texture parametrization is used in
the diagonalization of the CKM matrix. In other words, if a signal is observed in such flavor changing
interactions, it unlikely comes from a 3-3-1 model.
© 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
1. Introduction
The Standard Model (SM) has passed all precision tests thus
far, and it is the best description of nature. Although, we need
physics beyond the standard model so as to account for neutrino
masses and dark matter. Many models that address these puzzles
are plagued by flavor changing neutral current (FCNC) processes,
which are, however, absent in the SM at tree-level, thanks to the
GIM mechanism
1
[4]. Therefore, precise measurement of flavor
transition processes, such as those from neutral meson oscillations,
K
0
−
¯
K
0
, D
0
−
¯
D
0
and B
0
d
−
¯
B
0
d
, which are forbidden in the SM
at tree level, provide an excellent laboratory to test new physics
models, due to lack of standard model background. Conversely, fla-
vor
changing charged currents, are overwhelmed by numerous W
boson processes.
*
Corresponding author.
E-mail
address: queiroz@mpi-hd.mpg.de (F.S. Queiroz).
1
The concept of minimal flavor violation has guided us at how to suppress new
physics interactions [1–3].
That said, flavor changing neutral currents are often examined
in the context of neutral vector gauge boson, Z
. A multitude of
Abelian and non-Abelian models predict the existence of extra
neutral gauge bosons. Generally speaking they provide a straight-
forward
cross-correlation among observables, such as FCNC and
Z
at the LHC. Simplified models have become powerful tools
in this endeavor, since they capture the main features of UV-
complete
models [5–8]. However, at the end of the day one needs
a full theory to draw conclusive statements. In this attempt, we
will address the complementarity between flavor changing neu-
tral
currents and dilepton resonance searches at the LHC, which
refers to those with charged lepton pairs in the final state [9],
in the context of electroweak extensions of the SM, based on the
SU(3)
c
⊗ SU(3)
L
⊗ U (1)
N
gauge group, shortly referred as 3-3-1
models.
3-3-1
models are self-consistent if there exists only three gen-
erations
due to the combined effect of triangle gauge anoma-
lies
cancellations and QCD asymptotic freedom [10–14]. Moreover,
the model furnishes a suitable environment for neutrino masses
through see-saw mechanisms [15–28], dark matter [29–45], ex-
planation
of the strong CP problem in the quark sector [46,47],
http://dx.doi.org/10.1016/j.physletb.2016.10.057
0370-2693/
© 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.
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