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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 S. 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
Abstract : 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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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, Elsevier, 2015, 740, pp.118-136. ⟨10.1016/j.physletb.2014.11.042⟩. ⟨in2p3-01071039⟩

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