Search for flavour-changing neutral current interactions of the top quark and the Higgs boson in events with a pair of -leptons in pp collisions at CMS = 13 TeV with the ATLAS detector

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10475974" target="_blank" >RIV/00216208:11320/23:10475974 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=a-nuZd6U-P" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=a-nuZd6U-P</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP06(2023)155" target="_blank" >10.1007/JHEP06(2023)155</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Search for flavour-changing neutral current interactions of the top quark and the Higgs boson in events with a pair of -leptons in pp collisions at CMS = 13 TeV with the ATLAS detector

Popis výsledku v původním jazyce

A search for flavour-changing neutral current (FCNC) tqH interactions involvinga top quark, another up-type quark (q = u, c), and a Standard Model (SM) Higgsboson decaying into a -lepton pair (H ! +-) is presented. The search is based ona dataset of pp collisions at ps = 13TeV that corresponds to an integrated luminosityof 139 fb-1 recorded with the ATLAS detector at the Large Hadron Collider. Two processesare considered: single top quark FCNC production in association with a Higgs boson(pp ! tH), and top quark pair production in which one of top quarks decays into Wb andthe other decays into qH through the FCNC interactions. The search selects events withtwo hadronically decaying -lepton candidates (had) or at least one had with an additionallepton (e, μ), as well as multiple jets. Event kinematics is used to separate signal fromthe background through a multivariate discriminant. A slight excess of data is observedwith a significance of 2.3 above the expected SM background, and 95% CL upper limitson the t ! qH branching ratios are derived. The observed (expected) 95% CL upperlimits set on the t ! cH and t ! uH branching ratios are 9.4 x 10-4 (4.8+2.2-1.4 x 10-4) and6.9x10-4 (3.5+1.5-1.0 x10-4), respectively. The corresponding combined observed (expected)upper limits on the dimension-6 operator Wilson coefficients in the effective tqH couplingsare Cc &lt; 1.35 (0.97) and Cu &lt; 1.16 (0.82).

Název v anglickém jazyce

Search for flavour-changing neutral current interactions of the top quark and the Higgs boson in events with a pair of -leptons in pp collisions at CMS = 13 TeV with the ATLAS detector

Popis výsledku anglicky

A search for flavour-changing neutral current (FCNC) tqH interactions involvinga top quark, another up-type quark (q = u, c), and a Standard Model (SM) Higgsboson decaying into a -lepton pair (H ! +-) is presented. The search is based ona dataset of pp collisions at ps = 13TeV that corresponds to an integrated luminosityof 139 fb-1 recorded with the ATLAS detector at the Large Hadron Collider. Two processesare considered: single top quark FCNC production in association with a Higgs boson(pp ! tH), and top quark pair production in which one of top quarks decays into Wb andthe other decays into qH through the FCNC interactions. The search selects events withtwo hadronically decaying -lepton candidates (had) or at least one had with an additionallepton (e, μ), as well as multiple jets. Event kinematics is used to separate signal fromthe background through a multivariate discriminant. A slight excess of data is observedwith a significance of 2.3 above the expected SM background, and 95% CL upper limitson the t ! qH branching ratios are derived. The observed (expected) 95% CL upperlimits set on the t ! cH and t ! uH branching ratios are 9.4 x 10-4 (4.8+2.2-1.4 x 10-4) and6.9x10-4 (3.5+1.5-1.0 x10-4), respectively. The corresponding combined observed (expected)upper limits on the dimension-6 operator Wilson coefficients in the effective tqH couplingsare Cc &lt; 1.35 (0.97) and Cu &lt; 1.16 (0.82).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10300 - Physical sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

1029-8479

Svazek periodika

2023

Číslo periodika v rámci svazku

06

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

57

Strana od-do

155

Kód UT WoS článku

001035431100001

EID výsledku v databázi Scopus

2-s2.0-85163658273