Search for flavor-changing neutral current interactions of the top quark mediated by a Higgs boson in proton-proton collisions at 13 TeV

A search for flavor-changing neutral current interactions of the top quark (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>t</a:mi></a:mrow></a:math>) and the Higgs boson (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>H</c:mi></c:math>) is presented. The search is based on proton-proton collision data collected in 2016–2018 at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, and corresponding to an integrated luminosity of <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mn>138</e:mn><e:mtext> </e:mtext><e:mtext> </e:mtext><e:msup><e:mi>fb</e:mi><e:mrow><e:mo>−</e:mo><e:mn>1</e:mn></e:mrow></e:msup></e:math>. Events containing a pair of leptons with the same-sign electric charge and at least one jet are considered. The results are used to constrain the branching fraction (<g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mi mathvariant="script">B</g:mi></g:math>) of the top quark decaying to a Higgs boson and an up (<j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"><j:mi>u</j:mi></j:math>) or charm (<l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"><l:mi>c</l:mi></l:math>) quark. No significant excess above the estimated background was found. The observed (expected) upper limits at a 95% confidence level are found to be 0.072% (0.059%) for <n:math xmlns:n="http://www.w3.org/1998/Math/MathML" display="inline"><n:mrow><n:mi mathvariant="script">B</n:mi><n:mo stretchy="false">(</n:mo><n:mi>t</n:mi><n:mo stretchy="false">→</n:mo><n:mi>H</n:mi><n:mi>u</n:mi><n:mo stretchy="false">)</n:mo></n:mrow></n:math> and 0.043% (0.062%) for <t:math xmlns:t="http://www.w3.org/1998/Math/MathML" display="inline"><t:mi mathvariant="script">B</t:mi><t:mo stretchy="false">(</t:mo><t:mi>t</t:mi><t:mo stretchy="false">→</t:mo><t:mi>H</t:mi><t:mi>c</t:mi><t:mo stretchy="false">)</t:mo></t:math>. These results are combined with two other searches performed by the CMS Collaboration for flavor-changing neutral current interactions of top quarks and Higgs bosons in final states where the Higgs boson decays to either a pair of photons or a pair of bottom quarks. The resulting observed (expected) upper limits at the 95% confidence level are 0.019% (0.027%) for <z:math xmlns:z="http://www.w3.org/1998/Math/MathML" display="inline"><z:mi mathvariant="script">B</z:mi><z:mo stretchy="false">(</z:mo><z:mi>t</z:mi><z:mo stretchy="false">→</z:mo><z:mi>H</z:mi><z:mi>u</z:mi><z:mo stretchy="false">)</z:mo></z:math> and 0.037% (0.035%) for <fb:math xmlns:fb="http://www.w3.org/1998/Math/MathML" display="inline"><fb:mi mathvariant="script">B</fb:mi><fb:mo stretchy="false">(</fb:mo><fb:mi>t</fb:mi><fb:mo stretchy="false">→</fb:mo><fb:mi>H</fb:mi><fb:mi>c</fb:mi><fb:mo stretchy="false">)</fb:mo></fb:math>.

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Physical review. D/Physical review. D.
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2025-07-14
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https://doi.org/10.1103/95q6-vvlp
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1
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Particle physics theoretical and experimental studies
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article

Search for flavor-changing neutral current interactions of the top quark mediated by a Higgs boson in proton-proton collisions at 13 TeV

A. Santoro, T. Reis, B. Kailasapathy, M. A. Ciocci et al.
1 citations
Physical review. D/Physical review. D.
Particle physics theoretical and experimental studies
1.87
article

Search for flavor-changing neutral current interactions of the top quark mediated by a Higgs boson in proton-proton collisions at 13 TeV

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Abstract

A search for flavor-changing neutral current interactions of the top quark (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>t</a:mi></a:mrow></a:math>) and the Higgs boson (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>H</c:mi></c:math>) is presented. The search is based on proton-proton collision data collected in 2016–2018 at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, and corresponding to an integrated luminosity of <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mn>138</e:mn><e:mtext> </e:mtext><e:mtext> </e:mtext><e:msup><e:mi>fb</e:mi><e:mrow><e:mo>−</e:mo><e:mn>1</e:mn></e:mrow></e:msup></e:math>. Events containing a pair of leptons with the same-sign electric charge and at least one jet are considered. The results are used to constrain the branching fraction (<g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"><g:mi mathvariant="script">B</g:mi></g:math>) of the top quark decaying to a Higgs boson and an up (<j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"><j:mi>u</j:mi></j:math>) or charm (<l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"><l:mi>c</l:mi></l:math>) quark. No significant excess above the estimated background was found. The observed (expected) upper limits at a 95% confidence level are found to be 0.072% (0.059%) for <n:math xmlns:n="http://www.w3.org/1998/Math/MathML" display="inline"><n:mrow><n:mi mathvariant="script">B</n:mi><n:mo stretchy="false">(</n:mo><n:mi>t</n:mi><n:mo stretchy="false">→</n:mo><n:mi>H</n:mi><n:mi>u</n:mi><n:mo stretchy="false">)</n:mo></n:mrow></n:math> and 0.043% (0.062%) for <t:math xmlns:t="http://www.w3.org/1998/Math/MathML" display="inline"><t:mi mathvariant="script">B</t:mi><t:mo stretchy="false">(</t:mo><t:mi>t</t:mi><t:mo stretchy="false">→</t:mo><t:mi>H</t:mi><t:mi>c</t:mi><t:mo stretchy="false">)</t:mo></t:math>. These results are combined with two other searches performed by the CMS Collaboration for flavor-changing neutral current interactions of top quarks and Higgs bosons in final states where the Higgs boson decays to either a pair of photons or a pair of bottom quarks. The resulting observed (expected) upper limits at the 95% confidence level are 0.019% (0.027%) for <z:math xmlns:z="http://www.w3.org/1998/Math/MathML" display="inline"><z:mi mathvariant="script">B</z:mi><z:mo stretchy="false">(</z:mo><z:mi>t</z:mi><z:mo stretchy="false">→</z:mo><z:mi>H</z:mi><z:mi>u</z:mi><z:mo stretchy="false">)</z:mo></z:math> and 0.037% (0.035%) for <fb:math xmlns:fb="http://www.w3.org/1998/Math/MathML" display="inline"><fb:mi mathvariant="script">B</fb:mi><fb:mo stretchy="false">(</fb:mo><fb:mi>t</fb:mi><fb:mo stretchy="false">→</fb:mo><fb:mi>H</fb:mi><fb:mi>c</fb:mi><fb:mo stretchy="false">)</fb:mo></fb:math>.

Physical review. D/Physical review. D.Vol. 112(3)
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