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dc.contributor.authorAad, G
dc.contributor.authorAbbott, B
dc.contributor.authorAbbott, DC
dc.contributor.authorAbed Abud, A
dc.contributor.authorAbeling, K
dc.contributor.authorAbhayasinghe, DK
dc.contributor.authorAbidi, SH
dc.contributor.authorAboulhorma, A
dc.contributor.authorAbramowicz, H
dc.contributor.authorAbreu, H
dc.contributor.authorAbulaiti, Y
dc.contributor.authorAbusleme Hoffman, AC
dc.contributor.authorAcharya, BS
dc.contributor.authorAchkar, B
dc.contributor.authorAdam, L
dc.contributor.authorAdam Bourdarios, C
dc.contributor.authorAdamczyk, L
dc.contributor.authorAdamek, L
dc.contributor.authorAddepalli, SV
dc.contributor.authorAdelman, J
dc.contributor.authorAdiguzel, A
dc.contributor.authorAdorni, S
dc.contributor.authorAdye, T
dc.contributor.authorAffolder, AA
dc.contributor.authorAfik, Y
dc.contributor.authorAgapopoulou, C
dc.contributor.authorAgaras, MN
dc.contributor.authorAgarwala, J
dc.contributor.authorAggarwal, A
dc.contributor.authorAgheorghiesei, C
dc.contributor.authorAguilar-Saavedra, JA
dc.contributor.authorAhmad, A
dc.contributor.authorAhmadov, F
dc.contributor.authorAhmed, WS
dc.contributor.authorAi, X
dc.contributor.authorAielli, G
dc.contributor.authorAizenberg, I
dc.contributor.authorAkatsuka, S
dc.contributor.authorAkbiyik, M
dc.contributor.authorÅkesson, TPA
dc.contributor.authorAkimov, AV
dc.contributor.authorAl Khoury, K
dc.contributor.authorAlberghi, GL
dc.contributor.authorAlbert, J
dc.contributor.authorAlbicocco, P
dc.contributor.authorAlconada Verzini, MJ
dc.contributor.authorAlderweireldt, S
dc.contributor.authorAleksa, M
dc.contributor.authorAleksandrov, IN
dc.contributor.authorAlexa, C
dc.contributor.authorAlexopoulos, T
dc.contributor.authorAlfonsi, A
dc.contributor.authorAlfonsi, F
dc.contributor.authorAlhroob, M
dc.contributor.authorAli, B
dc.contributor.authorAli, S
dc.contributor.authorAliev, M
dc.contributor.authorAlimonti, G
dc.contributor.authorAllaire, C
dc.contributor.authorAllbrooke, BMM
dc.contributor.authorAllport, PP
dc.contributor.authorAloisio, A
dc.contributor.authorAlonso, F
dc.contributor.authorAlpigiani, C
dc.contributor.authorAlunno Camelia, E
dc.contributor.authorAlvarez Estevez, M
dc.contributor.authorAlviggi, MG
dc.contributor.authorAmaral Coutinho, Y
dc.contributor.authorAmbler, A
dc.contributor.authorAmbroz, L
dc.contributor.authorAmelung, C
dc.contributor.authorAmidei, D
dc.contributor.authorAmor Dos Santos, SP
dc.contributor.authorAmoroso, S
dc.contributor.authorAmos, KR
dc.contributor.authorAmrouche, CS
dc.contributor.authorAnaniev, V
dc.contributor.authorAnastopoulos, C
dc.contributor.authorAndari, N
dc.contributor.authorAndeen, T
dc.contributor.authorAnders, JK
dc.contributor.authorAndrean, SY
dc.contributor.authorAndreazza, A
dc.contributor.authorAngelidakis, S
dc.contributor.authorAngerami, A
dc.contributor.authorAnisenkov, AV
dc.contributor.authorAnnovi, A
dc.contributor.authorAntel, C
dc.contributor.authorAnthony, MT
dc.contributor.authorAntipov, E
dc.contributor.authorAntonelli, M
dc.contributor.authorAntrim, DJA
dc.contributor.authorAnulli, F
dc.contributor.authorAoki, M
dc.contributor.authorAparisi Pozo, JA
dc.contributor.authorAparo, MA
dc.contributor.authorAperio Bella, L
dc.contributor.authorAranzabal, N
dc.contributor.authorAraujo Ferraz, V
dc.contributor.authorArcangeletti, C
dc.date.accessioned2022-05-24T15:18:16Z
dc.date.available2022-05-24T15:18:16Z
dc.date.issued2022
dc.date.submitted2021-12-03
dc.identifier.issn1434-6044
dc.identifier.others10052-022-10182-7
dc.identifier.other10182
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/337431
dc.description.abstractA search is presented for the production of a single top quark via left-handed flavour-changing neutral-current (FCNC) interactions of a top quark, a gluon and an up or charm quark. Two production processes are considered: $u+g\rightarrow t$ and $c+g\rightarrow t$. The analysis is based on proton-proton collision data taken at a centre-of-mass energy of 13$\,$TeV with the ATLAS detector at the LHC. The data set corresponds to an integrated luminosity of 139 fb$^{-1}$. Events with exactly one electron or muon, exactly one $b$-tagged jet and missing transverse momentum are selected, resembling the decay products of a singly produced top quark. Neural networks based on kinematic variables differentiate between events from the two signal processes and events from background processes. The measured data are consistent with the background-only hypothesis, and limits are set on the production cross-sections of the signal processes: $\sigma(u+g\rightarrow t)\times\mathcal{B}(t\rightarrow Wb)\times\mathcal{B}(W\rightarrow \ell\nu)<3.0\,$pb and $\sigma(c+g\rightarrow t)\times\mathcal{B}(t\rightarrow Wb)\times\mathcal{B}(W\rightarrow \ell\nu)<4.7\,$pb at the 95% confidence level, with $\mathcal{B}(W\rightarrow \ell\nu)=0.325$ being the sum of branching ratios of all three leptonic decay modes of the $W$ boson. Based on the framework of an effective field theory, the cross-section limits are translated into limits on the strengths of the $tug$ and $tcg$ couplings occurring in the theory: $|C^{\,ut}_{uG}|/\Lambda^2 < 0.057\,$TeV$^{-2}$ and $|C^{\,ct}_{uG}|/\Lambda^2 < 0.14\,$TeV$^{-2}$. These bounds correspond to limits on the branching ratios of FCNC-induced top-quark decays: $\mathcal{B}(t\rightarrow u+g)< 0.61\times 10^{-4}$ and $\mathcal{B}(t\rightarrow c+g)< 3.7\times 10^{-4}$.
dc.languageen
dc.publisherSpringer Science and Business Media LLC
dc.subjectRegular Article - Experimental Physics
dc.titleSearch for flavour-changing neutral-current interactions of a top quark and a gluon in pp collisions at √s=13 TeV with the ATLAS detector
dc.typeArticle
dc.date.updated2022-05-24T15:17:58Z
prism.issueIdentifier4
prism.publicationNameEuropean Physical Journal C
prism.volume82
dc.identifier.doi10.17863/CAM.84844
dcterms.dateAccepted2022-03-04
rioxxterms.versionofrecord10.1140/epjc/s10052-022-10182-7
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidAad, G [0000-0002-6665-4934]
dc.contributor.orcidAbbott, B [0000-0002-5888-2734]
dc.contributor.orcidAbbott, DC [0000-0002-7248-3203]
dc.contributor.orcidAbed Abud, A [0000-0002-2788-3822]
dc.contributor.orcidAbeling, K [0000-0002-1002-1652]
dc.contributor.orcidAbhayasinghe, DK [0000-0002-2987-4006]
dc.contributor.orcidAbidi, SH [0000-0002-8496-9294]
dc.contributor.orcidAboulhorma, A [0000-0002-9987-2292]
dc.contributor.orcidAbramowicz, H [0000-0001-5329-6640]
dc.contributor.orcidAbreu, H [0000-0002-1599-2896]
dc.contributor.orcidAbulaiti, Y [0000-0003-0403-3697]
dc.contributor.orcidAbusleme Hoffman, AC [0000-0003-0762-7204]
dc.contributor.orcidAcharya, BS [0000-0002-8588-9157]
dc.contributor.orcidAchkar, B [0000-0002-0288-2567]
dc.contributor.orcidAdam, L [0000-0001-6005-2812]
dc.contributor.orcidAdam Bourdarios, C [0000-0002-2634-4958]
dc.contributor.orcidAdamczyk, L [0000-0002-5859-2075]
dc.contributor.orcidAdamek, L [0000-0003-1562-3502]
dc.contributor.orcidAddepalli, SV [0000-0002-2919-6663]
dc.contributor.orcidAdelman, J [0000-0002-1041-3496]
dc.contributor.orcidAdiguzel, A [0000-0001-6644-0517]
dc.contributor.orcidAdorni, S [0000-0003-3620-1149]
dc.contributor.orcidAdye, T [0000-0003-0627-5059]
dc.contributor.orcidAffolder, AA [0000-0002-9058-7217]
dc.contributor.orcidAfik, Y [0000-0001-8102-356X]
dc.contributor.orcidAgapopoulou, C [0000-0002-2368-0147]
dc.contributor.orcidAgaras, MN [0000-0002-4355-5589]
dc.contributor.orcidAgarwala, J [0000-0002-4754-7455]
dc.contributor.orcidAggarwal, A [0000-0002-1922-2039]
dc.contributor.orcidAgheorghiesei, C [0000-0003-3695-1847]
dc.contributor.orcidAguilar-Saavedra, JA [0000-0002-5475-8920]
dc.contributor.orcidAhmad, A [0000-0001-8638-0582]
dc.contributor.orcidAhmadov, F [0000-0003-3644-540X]
dc.contributor.orcidAhmed, WS [0000-0003-0128-3279]
dc.contributor.orcidAi, X [0000-0003-3856-2415]
dc.contributor.orcidAielli, G [0000-0002-0573-8114]
dc.contributor.orcidAizenberg, I [0000-0003-2150-1624]
dc.contributor.orcidAkatsuka, S [0000-0002-1681-6405]
dc.contributor.orcidAkbiyik, M [0000-0002-7342-3130]
dc.contributor.orcidÅkesson, TPA [0000-0003-4141-5408]
dc.contributor.orcidAkimov, AV [0000-0002-2846-2958]
dc.contributor.orcidAl Khoury, K [0000-0002-0547-8199]
dc.contributor.orcidAlberghi, GL [0000-0003-2388-987X]
dc.contributor.orcidAlbert, J [0000-0003-0253-2505]
dc.contributor.orcidAlbicocco, P [0000-0001-6430-1038]
dc.contributor.orcidAlconada Verzini, MJ [0000-0003-2212-7830]
dc.contributor.orcidAlderweireldt, S [0000-0002-8224-7036]
dc.contributor.orcidAleksa, M [0000-0002-1936-9217]
dc.contributor.orcidAleksandrov, IN [0000-0001-7381-6762]
dc.contributor.orcidAlexa, C [0000-0003-0922-7669]
dc.contributor.orcidAlexopoulos, T [0000-0002-8977-279X]
dc.contributor.orcidAlfonsi, A [0000-0001-7406-4531]
dc.contributor.orcidAlfonsi, F [0000-0002-0966-0211]
dc.contributor.orcidAlhroob, M [0000-0001-7569-7111]
dc.contributor.orcidAli, B [0000-0001-8653-5556]
dc.contributor.orcidAli, S [0000-0001-5216-3133]
dc.contributor.orcidAliev, M [0000-0002-9012-3746]
dc.contributor.orcidAlimonti, G [0000-0002-7128-9046]
dc.contributor.orcidAllaire, C [0000-0003-4745-538X]
dc.contributor.orcidAllbrooke, BMM [0000-0002-5738-2471]
dc.contributor.orcidAllport, PP [0000-0001-7303-2570]
dc.contributor.orcidAloisio, A [0000-0002-3883-6693]
dc.contributor.orcidAlonso, F [0000-0001-9431-8156]
dc.contributor.orcidAlpigiani, C [0000-0002-7641-5814]
dc.contributor.orcidAlvarez Estevez, M [0000-0002-8181-6532]
dc.contributor.orcidAlviggi, MG [0000-0003-0026-982X]
dc.contributor.orcidAmaral Coutinho, Y [0000-0002-1798-7230]
dc.contributor.orcidAmbler, A [0000-0003-2184-3480]
dc.contributor.orcidAmbroz, L [0000-0002-0987-6637]
dc.contributor.orcidAmidei, D [0000-0002-6814-0355]
dc.contributor.orcidAmor Dos Santos, SP [0000-0001-7566-6067]
dc.contributor.orcidAmoroso, S [0000-0001-5450-0447]
dc.contributor.orcidAmos, KR [0000-0003-1757-5620]
dc.contributor.orcidAnaniev, V [0000-0003-3649-7621]
dc.contributor.orcidAnastopoulos, C [0000-0003-1587-5830]
dc.contributor.orcidAndari, N [0000-0002-4935-4753]
dc.contributor.orcidAndeen, T [0000-0002-4413-871X]
dc.contributor.orcidAnders, JK [0000-0002-1846-0262]
dc.contributor.orcidAndrean, SY [0000-0002-9766-2670]
dc.contributor.orcidAndreazza, A [0000-0001-5161-5759]
dc.contributor.orcidAngelidakis, S [0000-0002-8274-6118]
dc.contributor.orcidAngerami, A [0000-0001-7834-8750]
dc.contributor.orcidAnisenkov, AV [0000-0002-7201-5936]
dc.contributor.orcidAnnovi, A [0000-0002-4649-4398]
dc.contributor.orcidAntel, C [0000-0001-9683-0890]
dc.contributor.orcidAnthony, MT [0000-0002-5270-0143]
dc.contributor.orcidAntipov, E [0000-0002-6678-7665]
dc.contributor.orcidAntonelli, M [0000-0002-2293-5726]
dc.contributor.orcidAntrim, DJA [0000-0001-8084-7786]
dc.contributor.orcidAnulli, F [0000-0003-2734-130X]
dc.contributor.orcidAoki, M [0000-0001-7498-0097]
dc.contributor.orcidAparisi Pozo, JA [0000-0001-7401-4331]
dc.contributor.orcidAparo, MA [0000-0003-4675-7810]
dc.contributor.orcidAperio Bella, L [0000-0003-3942-1702]
dc.contributor.orcidAranzabal, N [0000-0001-9013-2274]
dc.contributor.orcidAraujo Ferraz, V [0000-0003-1177-7563]
dc.contributor.orcidArcangeletti, C [0000-0001-8648-2896]
dc.identifier.eissn1434-6052
dc.publisher.urlhttp://dx.doi.org/10.1140/epjc/s10052-022-10182-7
cam.issuedOnline2022-04-19
dc.identifier.arxiv2112.01302


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