Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector - INSPIRE

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Search for flavor-changing neutral currents in top quark decays $t\to Hc$ and $t \to Hu$ in multilepton final states in proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector

ATLAS

Collaboration

May 9, 2018

25 pages

Published in:

Phys.Rev.D 98 (2018) 3, 032002

Published: Aug 7, 2018

e-Print:

1805.03483 [hep-ex]

DOI:

10.1103/PhysRevD.98.032002

PDG:

{{\mathit t}}

\rightarrow

{{\mathit H}}{{\mathit u}}

Report number:

CERN-EP-2018-067

Experiments:

CERN-LHC-ATLAS

View in:

reference search69 citations

Citations per year

Abstract: (APS)

Flavor-changing neutral currents are not present in the Standard Model at tree level and are suppressed in loop processes by the unitarity of the Cabibbo-Kobayashi-Maskawa matrix; the corresponding rates for top quark decay processes are experimentally unobservable. Extensions of the Standard Model can generate new flavor-changing neutral current processes, leading to signals which, if observed, would be unambiguous evidence of new interactions. A data set corresponding to an integrated luminosity of 36.1 fb-1 of pp collisions at a center-of-mass energy of s=13 TeV recorded with the ATLAS detector at the Large Hadron Collider is used to search for top quarks decaying to up or charm quarks with the emission of a Higgs boson, with subsequent Higgs boson decay to final states with at least one electron or muon. No signal is observed and limits on the branching fractions B(t→Hc)<0.16% and B(t→Hu)<0.19% at 95% confidence level are obtained (with expected limits of 0.15% in both cases).

Note:

36 pages, author list starting at page 20, 3 figures, 4 tables, published in Phys. Rev. D. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2017-15/

Particle Physics Experiments
p p: colliding beams
top: rare decay
neutral current: flavor changing
Higgs particle: decay modes
W: pair production
Z0: pair production
tau: pair production
W: leptonic decay
Z0: leptonic decay

References(62)

Figures(7)

[1]

Weak Interactions with Lepton-Hadron Symmetry

- Phys.Rev.D 2 (1970) 1285-1292,
- Also in *Lai, C. H. (ed.): Gauge Theory Of Weak and Electromagnetic Interactions*, 203-210,
- In *Rosner, J.L. (ed.): New Particles*, 18-25,
- In *Lichtenberg, D. B. (Ed.), Rosen, S. P. (Ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 193-200.,
- In *Bologna 1984, Proceedings, Fifty Years of Weak-Interaction Physics* 687-694
•
DOI:
- 10.1103/PhysRevD.2.1285

[2]

Top flavor-changing neutral interactions: Theoretical expectations and experimental detection

J.A. Aguilar-Saavedra
(
- Lisbon, IST
)

- Acta Phys.Polon.B 35 (2004) 2695-2710
•
e-Print:
- hep-ph/0409342

[3]

Search for Anomalous Single Top Quark Production in Association with a Photon in $pp$ Collisions at $\sqrt{s}=8$ TeV

CMS

Collaboration

•

Vardan Khachatryan
(
- Yerevan Phys. Inst.
)

et al.

- JHEP 04 (2016) 035
•
e-Print:
- 1511.03951
•
DOI:
- 10.1007/JHEP04(2016)035

[4]

Search for flavour-changing neutral current top-quark decays to $qZ$ in $pp$ collision data collected with the ATLAS detector at $\sqrt s =8$ TeV

ATLAS

Collaboration

•

Georges Aad
(
- Marseille, CPPM
)

et al.

- Eur.Phys.J.C 76 (2016) 1, 12
•
e-Print:
- 1508.05796
•
DOI:
- 10.1140/epjc/s10052-015-3851-5

[5]

Search for associated production of a Z boson with a single top quark and for tZ flavour-changing interactions in pp collisions at $\sqrt{s}=8$ TeV

CMS

Collaboration

•

Albert M Sirunyan
(
- Yerevan Phys. Inst.
)

et al.

- JHEP 07 (2017) 003
•
e-Print:
- 1702.01404
•
DOI:
- 10.1007/JHEP07(2017)003

[6]

Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector

ATLAS

Collaboration

•

Georges Aad
(
- Marseille, CPPM
)

et al.

- Eur.Phys.J.C 76 (2016) 2, 55,
- Eur.Phys.J.C 82 (2022) 1, 70 (erratum)
•
e-Print:
- 1509.00294
•
DOI:
- 10.1140/epjc/s10052-016-3876-4

[7]

Search for anomalous Wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at $\sqrt{s} =$ 7 and 8 TeV

CMS

Collaboration

•

Vardan Khachatryan
(
- Yerevan Phys. Inst.
)

et al.

- JHEP 02 (2017) 028
•
e-Print:
- 1610.03545
•
DOI:
- 10.1007/JHEP02(2017)028

[8]

Natural Conservation Laws for Neutral Currents

Sheldon L. Glashow
(
- Harvard U.
)
,
Steven Weinberg
(
- Harvard U.
)

- Phys.Rev.D 15 (1977) 1958
•
DOI:
- 10.1103/PhysRevD.15.1958

[9]

A New Model of Weak {CP} Violation

F. del Aguila
(
- CERN
)
,
J. Cortes
(
- CERN
)

- Phys.Lett.B 156 (1985) 243-249
•
DOI:
- 10.1016/0370-2693(85)91517-5

[10]

Mass Matrix Ansatz and Flavor Nonconservation in Models with Multiple Higgs Doublets

- Phys.Rev.D 35 (1987) 3484
•
DOI:
- 10.1103/PhysRevD.35.3484

[11]

Loop induced flavor changing neutral decays of the top quark in a general two Higgs doublet model

Santi Bejar
(
- Barcelona, Autonoma U.
)
,
Jaume Guasch
(
- Karlsruhe U.
)
,
Joan Sola
(
- Barcelona, Autonoma U.
)

- Nucl.Phys.B 600 (2001) 21-38
•
e-Print:
- hep-ph/0011091
•
DOI:
- 10.1016/S0550-3213(01)00044-X

[12]

FCNC top quark decays: A Door to SUSY physics in high luminosity colliders?

Jaume Guasch
(
- Karlsruhe U.
)
,
Joan Sola
(
- Barcelona, Autonoma U.
)

- Nucl.Phys.B 562 (1999) 3-28
•
e-Print:
- hep-ph/9906268
•
DOI:
- 10.1016/S0550-3213(99)00579-9

[13]

Flavor changing top quark decays in r parity violating SUSY

Jin Min Yang
(
- Iowa State U. and
- Iowa State U., IITAP
)
,
Bing-Lin Young
(
- Iowa State U.
)
,
X. Zhang
(
- Beijing, Inst. High Energy Phys.
)

- Phys.Rev.D 58 (1998) 055001
•
e-Print:
- hep-ph/9705341
•
DOI:
- 10.1103/PhysRevD.58.055001

[14]

Collider Signals of Top Quark Flavor Violation from a Warped Extra Dimension

- Phys.Rev.D 75 (2007) 015002
•
e-Print:
- hep-ph/0606293
•
DOI:
- 10.1103/PhysRevD.75.015002

[15]

Composite Higgs-Mediated FCNC

Kaustubh Agashe
(
- Maryland U.
)
,
Roberto Contino
(
- Rome U. and
- INFN, Rome and
- CERN
)

- Phys.Rev.D 80 (2009) 075016
•
e-Print:
- 0906.1542
•
DOI:
- 10.1103/PhysRevD.80.075016

[16]

Working Group Report: Top Quark

et al.

e-Print:
- 1311.2028

[17]

Search for flavour-changing neutral current top quark decays $t\to Hq$ in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

ATLAS

Collaboration

•

Georges Aad
(
- Marseille, CPPM
)

et al.

- JHEP 12 (2015) 061
•
e-Print:
- 1509.06047
•
DOI:
- 10.1007/JHEP12(2015)061

[18]

Search for top quark decays $t \to qH$ with $H \to \gamma\gamma$ using the ATLAS detector

ATLAS

Collaboration

•

Georges Aad
(
- Marseille, CPPM
)

et al.

- JHEP 06 (2014) 008
•
e-Print:
- 1403.6293
•
DOI:
- 10.1007/JHEP06(2014)008

[19]

Searches for heavy Higgs bosons in two-Higgs-doublet models and for $t→ch$ decay using multilepton and diphoton final states in $pp$ collisions at 8 TeV

CMS

Collaboration

•

Vardan Khachatryan
(
- Yerevan Phys. Inst.
)

et al.

- Phys.Rev.D 90 (2014) 112013
•
e-Print:
- 1410.2751
•
DOI:
- 10.1103/PhysRevD.90.112013

[20]

Search for anomalous production of events with three or more leptons in $pp$ collisions at $\sqrt{s} =$ 8 TeV

CMS

Collaboration

•

Serguei Chatrchyan
(
- Yerevan Phys. Inst.
)

et al.

- Phys.Rev.D 90 (2014) 032006
•
e-Print:
- 1404.5801
•
DOI:
- 10.1103/PhysRevD.90.032006

[21]

Search for top quark decays $t\rightarrow qH$ , with $H\to\gamma\gamma$ , in $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector

ATLAS

Collaboration

•

Morad Aaboud
(
- Oujda U.
)

et al.

- JHEP 10 (2017) 129
•
e-Print:
- 1707.01404
•
DOI:
- 10.1007/JHEP10(2017)129

[22]

Search for the flavor-changing neutral current interactions of the top quark and the Higgs boson which decays into a pair of b quarks at $\sqrt{s}=$ 13 TeV

CMS

Collaboration

•

Albert M Sirunyan
(
- Yerevan Phys. Inst.
)

et al.

- JHEP 06 (2018) 102
•
e-Print:
- 1712.02399
•
DOI:
- 10.1007/JHEP06(2018)102

[23]

Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector

ATLAS

Collaboration

•

Morad Aaboud
(
- Oujda U.
)

et al.

- Phys.Rev.D 97 (2018) 7, 072003
•
e-Print:
- 1712.08891
•
DOI:
- 10.1103/PhysRevD.97.072003

[24]

The ATLAS Experiment at the CERN Large Hadron Collider

ATLAS

Collaboration

•

G. Aad
(
- Marseille, CPPM
)

et al.

- JINST 3 (2008) S08003
•
DOI:
- 10.1088/1748-0221/3/08/S08003

[25]

ATLAS Design Report 2010, url: ATLAS Insertable B-Layer Technical Design Report Addendum -ADD-1,, URL:

ATLAS Collaboration

Collaboration

•

Technical

et al.

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