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 2, 1 L. Vacavant 1 D. Boumediene 3 Emmanuel Busato 3 D. Calvet 3 S. Calvet 3 J. Donini 3 E. Dubreuil 3 N. Ghodbane 3 G. Gilles 3 Ph. Gris 3 C. Guicheney 3 H. Liao 3 D. Pallin 3 F. Podlyski 3 C. Santoni 3 Timothée Theveneaux-Pelzer 3 Loïc Valery 3 F. Vazeille 3 G. Rahal 4 H. Bachaou 5 F. Balli 5 F. Bauer 5 N. Besson 5 J.-B. Blanchard 5 M. Boonekamp 5 A. Calandri 5 L. Chevalier 5 M. Dano Hoffmann 5 F. Deliot 5 J. Ernwein 5 A.I. Etienvre 5 A. Formica 5 P.F. Giraud 5 J. Goncalves Pinto Firmino da Costa 5 H.M.X. Grabas 5 C. Guyot 5 R. Hanna 5 S. Hassani 5 W. Kozanecki 5 E. Lancon 5 J.F. Laporte 5 C. Maiani 5 P. Mal 5 B. Mansoulie 5 H. Martinez 3 N. Meric 5 J.-P. Meyer 5 R. Nicolaidou 5 A. Ouraou 5 E. Protopapadaki 5 C.R. Royon 5 L. L. Schoffel 5 Ph. Schune 5 Ph. Schwemling 5 J. Schwindling 5 D. Tsionou 5 N. Vranjes 5 M. Xiao 5 T. Beau 6 M. Bomben 6 G. Calderini 6 F. Crescioli 6 O. Davignon 6 S. De Cecco 6 A. Demilly 6 F. Derue 6 P. Francavilla 6 M.W. Krasny 6 D. Lacour 6 B. Laforge 6 S. Laplace 6 O. Le Dortz 6 G. Lefebvre 6 B. Malaescu 6 G. Marchiori 6 J. Ocariz 6 S. Pires 6 M. Ridel 6 L. Roos 6 S. Trincaz-Duvoid 6 F. Vannucci 6 D. Varouchas 6 G. Hallewell 1 D. Simon 3 N. Berger 7 M. Delmastro 7 L. Di Ciaccio 7 S. Elles 7 C. Goy 7 T. Hryn'Ova 7 S. Jézéquel 7 H. Keoshkerian 7 I. Koletsou 7 R. Lafaye 7 J. Leveque 7 V.P. Lombardo 7 N. Massol 7 H. Przysiezniak 7 G. Sauvage 7 E. Sauvan 7 M. Schwoerer 7 O. Simard 7 T. Todorov 7 I. Wingerter-Seez 7 S. Albrand 8 J. Brown 8 J. Collot 8 S. Crépé-Renaudin 8 B. Dechenaux 8 P.A. Delsart 8 C. Gabaldon 8 M.H. Genest 8 J.Y. Hostachy 8 F. Ledroit-Guillon 8 A. Lleres 8 A. Lucotte 8 F. Malek 8 C. Monini 8 J. Stark 8 B. Trocmé 8 M. Wu 8 S. Abdel Khalek 9 A. Bassalat 9 C. Becot 9 S. Binet 9 C. Bourdarios 9 D. Charfeddine 9 J.B. De Vivie de Regie 9 L. Duflot 9 M. Escalier 9 L. Fayard 9 D. Fournier 9 J.-F. Grivaz 9 T. Guillemin 9 F. Hariri 9 S. Henrot-Versillé 9 J. Hrivnac 9 L. Iconomidou-Fayard 9 M. Kado 9 A. Lounis 9 N. Makovec 9 L. Poggioli 9 P. Puzo 9 A. Renaud 9 D. Rousseau 9 G. Rybkin 9 A.C. Schaffer 9 E. Scifo 9 L. Serin 9 S. Simion 9 R. Tanaka 9 H.L. Tran 9 D. Zerwas 9 Zhen Zhang 9
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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Physics Letters B, Elsevier, 2015, 740, pp.118-136. 〈10.1016/j.physletb.2014.11.042〉
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Dernière modification le : jeudi 22 février 2018 - 15:28:03

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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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