Measurement of top-quark pair production in association with charm quarks in proton-proton collisions at SQUARE ROOT𝑠 = 13 TeV with the ATLAS detector

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10511255" target="_blank" >RIV/00216208:11320/25:10511255 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-nv3Csk0os" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-nv3Csk0os</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2024.139177" target="_blank" >10.1016/j.physletb.2024.139177</a>

Result language

angličtina

Original language name

Measurement of top-quark pair production in association with charm quarks in proton-proton collisions at SQUARE ROOT𝑠 = 13 TeV with the ATLAS detector

Original language description

Inclusive cross-sections for top-quark pair production in association with charm quarks are measured with proton--proton collision data at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 140 fb-1,collected with the ATLAS experiment at the LHC between 2015 and 2018. The measurements are performed byrequiring one or two charged leptons (electrons and muons), two 𝑏-tagged jets, and at least one additional jetin the final state. A custom flavor-tagging algorithm is employed for the simultaneous identficationof 𝑏-jetsand 𝑐-jets. In a fiducial phase space that replicates the acceptance of the ATLAS detector, the cross-sections for𝑡̄𝑡 + &gt;=2𝑐 and 𝑡̄𝑡 + 1𝑐 production are measured to be 1.28+0.27-0.24 pb and 6.4+1.0-0.9 pb, respectively. The measurementsare primarily limited by uncertainties in the modeling of inclusive 𝑡̄𝑡 and 𝑡̄𝑡 + 𝑏̄𝑏production, in the calibrationof the flavor-tagging algorithm, and by data statistics. Cross-section predictions from various 𝑡̄𝑡 simulations arelargely consistent with the measured cross-section values, though all underpredict the observed values by 0.5to 2.0 standard deviations. In a phase-space volume without requirements on the 𝑡̄𝑡 decay products and the jetmultiplicity, the cross-section ratios of 𝑡̄𝑡 + &gt;=2𝑐 and 𝑡̄𝑡 + 1𝑐 to total 𝑡̄𝑡 + jets production are determined to be(1.23 +- 0.25)% and (8.8 +- 1.3)%.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10300 - Physical sciences

Project

<a href="/en/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Fundamental constituents of matter through frontier technologies</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ISSN

0370-2693

e-ISSN

1873-2445

Volume of the periodical

860

Issue of the periodical within the volume

2025

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

28

Pages from-to

139177

UT code for WoS article

001389545800001

EID of the result in the Scopus database

2-s2.0-85211336127