Search for s-channel single top-quark production in proton-proton collisions at $\sqrt{s}$=8 TeV with the ATLAS detector - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physics Letters B Année : 2015

Search for s-channel single top-quark production in proton-proton collisions at $\sqrt{s}$=8 TeV with the ATLAS detector

G. Aad (1) , L. Alio (1) , M. Barbero (1) , C. Bertella (1) , J.C. Clémens (1) , Y. Coadou (1) , Sara Diglio (1) , F. Djama (1) , L. Feligioni (1) , D. Hoffmann (1) , F. Hubaut (1) , E. B. F. G. Knoops (1) , E. Le Guirriec (1) , B. Li (1) , D. Madaffari (1) , K. Mochizuki (1) , E. Monnier (1) , S. Muanza (1) , Y. Nagai (1) , P. Pralavorio (1) , A. Rozanov (1) , T. Serre (1) , M. Talby (1) , E. Tiouchichine (1) , S. Tisserant (1) , J. Toth (1) , F. Touchard (1) , M. Ughetto (1) , L. Vacavant (1) , D. Boumediene (2) , Emmanuel Busato (2) , D. Calvet (2) , S. Calvet (2) , J. Donini (2) , E. Dubreuil (2) , N. Ghodbane (2) , G. Gilles (2) , Ph. Gris (2) , C. Guicheney (2) , H. Liao (2) , D. Pallin (2) , F. Podlyski (2) , C. Santoni (2) , Timothée Theveneaux-Pelzer (2) , Loïc Valery (2) , F. Vazeille (2) , G. Rahal (3) , H. Bachaou (4) , F. Balli (4) , F. Bauer (4) , N. Besson (4) , J.-B. Blanchard (4) , M. Boonekamp (4) , A. Calandri (4) , L. Chevalier (4) , M. Dano Hoffmann (4) , F. Deliot (4) , J. Ernwein (4) , A.I. Etienvre (4) , A. Formica (4) , P.F. Giraud (4) , J. Goncalves Pinto Firmino da Costa (4) , H.M.X. Grabas (4) , C. Guyot (4) , R. Hanna (4) , S. Hassani (4) , W. Kozanecki (4) , E. Lancon (4) , J.F. Laporte (4) , C. Maiani (4) , P. Mal (4) , B. Mansoulie (4) , H. Martinez (2) , N. Meric (4) , J.-P. Meyer (4) , R. Nicolaidou (4) , A. Ouraou (4) , E. Protopapadaki (4) , C.R. Royon (4) , L.L. Schoffel (4) , Ph. Schune (4) , Ph. Schwemling (4) , J. Schwindling (4) , D. Tsionou (4) , N. Vranjes (4) , M. Xiao (4) , T. Beau (5) , M. Bomben (5) , G. Calderini (5) , F. Crescioli (5) , O. Davignon (5) , S. de Cecco (5) , A. Demilly (5) , F. Derue (5) , P. Francavilla (5) , M.W. Krasny (5) , D. Lacour (5) , B. Laforge (5) , S. Laplace (5) , O. Le Dortz (5) , G. Lefebvre (5) , B. Malaescu (5) , G. Marchiori (5) , J. Ocariz (5) , S. Pires (5) , M. Ridel (5) , L. Roos (5) , S. Trincaz-Duvoid (5) , F. Vannucci (5) , D. Varouchas (5) , G. Hallewell (1) , D. Simon (2) , N. Berger (6) , M. Delmastro (6) , L. Di Ciaccio (6) , S. Elles (6) , C. Goy (6) , T. Hryn'Ova (6) , S. Jézéquel (6) , H. Keoshkerian (6) , I. Koletsou (6) , R. Lafaye (6) , J. Leveque (6) , V.P. Lombardo (6) , N. Massol (6) , H. Przysiezniak (6) , G. Sauvage (6) , E. Sauvan (6) , M. Schwoerer (6) , O. Simard (6) , T. Todorov (6) , I. Wingerter-Seez (6) , S. Albrand (7) , J. Brown (7) , J. Collot (7) , S. Crépé-Renaudin (7) , B. Dechenaux (7) , P.A. Delsart (7) , C. Gabaldon (7) , M.H. Genest (7) , J.Y. Hostachy (7) , F. Ledroit-Guillon (7) , A. Lleres (7) , A. Lucotte (7) , F. Malek (7) , C. Monini (7) , J. Stark (7) , B. Trocmé (7) , M. Wu (7) , S. Abdel Khalek (8) , A. Bassalat (8) , C. Becot (8) , S. Binet (8) , C. Bourdarios (8) , D. Charfeddine (8) , J.B. de Vivie de Regie (8) , L. Duflot (8) , M. Escalier (8) , L. Fayard (8) , D. Fournier (8) , J.-F. Grivaz (8) , T. Guillemin (8) , F. Hariri (8) , S. Henrot-Versillé (8) , J. Hrivnac (8) , L. Iconomidou-Fayard (8) , M. Kado (8) , A. Lounis (8) , N. Makovec (8) , L. Poggioli (8) , P. Puzo (8) , A. Renaud (8) , D. Rousseau (8) , G. Rybkin (8) , A.C. Schaffer (8) , E. Scifo (8) , L. Serin (8) , S. Simion (8) , R. Tanaka (8) , H.L. Tran (8) , D. Zerwas (8) , Z. Zhang (8)
G. Aad
Y. Coadou
S. Calvet
N. Berger
C. Goy
T. Hryn'Ova
D. Rousseau
Z. Zhang

Résumé

This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb$^{-1}$. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of $\sigma_s$=5.0$\pm$4.3 pb, consistent with the Standard Model expectation.
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Dates et versions

in2p3-01071039 , version 1 (01-06-2021)

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G. Aad, L. Alio, M. Barbero, C. Bertella, J.C. Clémens, et al.. Search for s-channel single top-quark production in proton-proton collisions at $\sqrt{s}$=8 TeV with the ATLAS detector. Physics Letters B, 2015, 740, pp.118-136. ⟨10.1016/j.physletb.2014.11.042⟩. ⟨in2p3-01071039⟩
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