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Available online at www.sciencedirect.com

ScienceDirect

Nuclear Physics B 952 (2020) 114921

www.elsevier.com/locate/nuclphysb

Constraints on the Higgs boson anomalous FCNC

interactions with light quarks

M. Ilyushin

, P. Mandrik

a,b,∗

, S. Slabospitskii

a,b

NRC “Kurchatov Institute” -IHEP, Protvino, Moscow Region, Russia

Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia

Received 13

May 2019; received in revised form 27 November 2019; accepted 6 January 2020

Available

online 9 January 2020

Editor: Hong-Jian

Abstract

We consider the Higgs boson anomalous FCNC interactions with u, c, d, s and b quarks using the

effective ﬁeld theory framework. Constraints on anomalous couplings are derived from experimental results

on Higgs boson production with subsequent decay into b

b pair at LHC with

√

s = 13 TeV. Upper limits

on the branching fractions of H → b¯s and H → b

d are set by performing a realistic detector simulation

and accurately reproducing analysis selections of the CMS Higgs boson measurement in the four-lepton

ﬁnal state at

√

s = 13 TeV. The searches are projected into operation conditions of HL-LHC. Sensitivity at

FCC-hh to anomalous FCNC interactions is studied based on Higgs boson production with H → γγ decay

channel. It is shown that at FCC-hh machine one can expect to set the upper limits of the order of 10

−2

95% CL for B(H →b¯s) and B(H → b

d).

(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP

1. Introduction

The discovery of Higgs boson by the Large Hadron Collider (LHC) [1,2] experiments has

opened up new area of direct searches for physics Beyond Standard Model (BSM). One of the

possible anomalous interaction is the Higgs-mediated ﬂavor-changing neutral currents (FCNC).

These processes are forbidden in Standard Model (SM) at tree le

vel and are strongly suppressed

in loop corrections by the Glashow-Iliopoulos-Maiani mechanism [3].

Corresponding author.

E-mail

address: petr.mandrik@ihep.ru (P. Mandrik).

https://doi.org/10.1016/j.nuclphysb.2020.114921

The Authors. 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

2 M. Ilyushin et al. / Nuclear Physics B 952 (2020) 114921

Table 1

The

current experimental upper limits on FCNC decays of top-quark at 95% CL.

Detector B(t →uH ) B(t →cH ) Ref.

ATLAS, 13 TeV, 36.1 fb

−1

1.2 ×10

−3

1.1 ×10

−3

[7]

CMS, 13 TeV, 35.9 fb

−1

4.7 ×10

−3

4.7 ×10

−3

[9]

Table 2

The

upper limits on FCNC decays of Higgs boson to the

light quarks at 95% CL from experiments with mesons

(see [10]for details).

Observable Constraint

oscillations B(H → u ¯c)  2 ×10

−5

oscillations B(H → d

b)  8 ×10

−5

oscillations B(H → d ¯s)  2 × 10

−6

oscillations B(H → s

b)  7 ×10

−3

The Higgs mediated FCNC in top-quark sector is actively investigated at LHC [4–9]. The

main analyses strategy is to search for t

t production with one top quark decay through a FCNC

channel and other follow the dominant SM decay t → bW . In [9] production of single top quark

through a FCNC in association with the Higgs boson is considered in additional. The results of

the searches are summarized in T

able 1.

The FCNC couplings of the Higgs to the rest SM quarks can af

fect various low-energy preci-

sion measurements. The strongest indirect bounds on FCNC quark-quark-Higgs couplings came

from measurement of B

d,s

−

d,s

, K

−

and D

−

oscillations [10]. The corresponding

constraints on FCNC couplings translated into upper limits on branching fractions of the FCNC

decays of Higgs boson to u, d, s, c, b quarks are summarized in the Table 2. Due to huge QCD

background the experiments at LHC are less sensitive to searching for FCNC decays of the Higgs

boson. On the other hand the direct probes of such processes could complement the indirect lim-

its. In addition in possible BSM scenarios the branching ratio of H → qq



can be enhanced with

keeping other low-energy ﬂavor observables approximately at their SM values [11,12]. Therefor,

the searches for FCNC Higgs boson interactions are very important and could be considered as

a complementary probe of new physics.

At the moment there is no an

y experimental evidence of the FCNC process. Future research

and increase of the experimental sensitivity are related to the proposed energy-frontier colliders

[13–16] such as High Luminosity LHC (HL-LHC) [17] and Future Circular Collider (FCC-hh)

project, deﬁned by the target of 100 TeV proton-proton collisions with a total inte

grated lumi-

nosity of 30 ab

−1

[18,19].

In this article we in

vested the contribution of FCNC interactions to the single Higgs boson

production (Fig. 1, left) and Higgs boson production in association with a light quark (Fig. 1,

center and right). The limits on Higgs boson FCNC interactions based on recent LHC data are

obtained and the searches are projected into operation conditions of HL-LHC [17]

and FCC-hh

projects.

2. The constraints from the current Higgs production cross-sections

The ﬂavor-violating couplings may arise from different sources [20]. In this article we use the

effective ﬁeld theory approach (EFT) [21–23]for describing the effects of BSM physics in Higgs

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