Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton+jets final states produced in pp collisions at sqrt(s) = 8 TeV

V. Khachatryan M. Besançon 1 F. Couderc 1 M. Dejardin 1 D. Denegri 1 B. Fabbro 1 J.L. Faure 2 C. Favaro 1 F. Ferri 1 S. Ganjour 1 S. Ghosh A. Givernaud 1 P. Gras 1 G. Hamel De Monchenault 1 P. Jarry 1 I. Kucher 1 E. Locci 1 M. Machet 1 J. Malcles 1 J. Rander 1 A. Rosowsky 1 M. Titov 1 A. Zghiche 1 A. Abdulsalam 3 I. Antropov 3 S. Baffioni 3 F. Beaudette 3 P. Busson 3 L. Cadamuro 3 E. Chapon 3 C. Charlot 3 O. Davignon 3 R. Granier De Cassagnac 3 M. Jo 3 S. Lisniak 3 P. Mine 3 I.N. Naranjo 3 M. Nguyen 3 C. Ochando 3 G. Ortona 3 P. Paganini 3 P. Pigard 3 S. Regnard 3 R. Salerno 3 Y. Sirois 3 T. Strebler 3 Y. Yilmaz 3 A. Zabi 3 J.-L. Agram 4 J. Andrea 4 A. Aubin 4 D. Bloch 4 J.-M. Brom 4 M. Buttignol 4 E.C. Chabert 4 N. Chanon 4 C. Collard 4 E. Conte 4 X. Coubez 4 J.-C. Fontaine 4 D. Gele 4 U. Goerlach 4 A.-C. Le Bihan 4 J.A. Merlin 4 K. Skovpen 4 P. Van Hove 4 S. Gadrat 5 S. Beauceron 6 C. Bernet 6 G. Boudoul 6 E. Bouvier 6 C.A. Carrillo Montoya 6 R. Chierici 6 D. Contardo 6 B. Courbon 6 P. Depasse 6 H. El Mamouni 6 J. Fan 6 J. Fay 6 S. Gascon 6 M. Gouzevitch 6 G. Grenier 6 B. Ille 6 F. Lagarde 6 I.B. Laktineh 6 M. Lethuillier 6 L. Mirabito 6 A.L. Pequegnot 6 S. Perries 6 A. Popov D. Sabes 6 V. Sordini 6 M. Vander Donckt 6 P. Verdier 6 S. Viret 6
Abstract : The W boson helicity fractions from top quark decays in t-tbar events are measured using data from proton-proton collisions at a centre-of-mass energy of 8 TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 inverse-femtobarns. Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F[0] = 0.681 +/- 0.012 (stat) +/- 0.023 (syst), F[L] = 0.323 +/- 0.008 (stat) +/- 0.014 (syst), and F[R] = -0.004 +/- 0.005 (stat) +/- 0.014 (syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.
Type de document :
Article dans une revue
Physics Letters B, Elsevier, 2016, 762, pp.512-534. 〈10.1016/j.physletb.2016.10.007〉
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Soumis le : mardi 31 mai 2016 - 07:04:40
Dernière modification le : mardi 16 janvier 2018 - 15:59:56

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V. Khachatryan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton+jets final states produced in pp collisions at sqrt(s) = 8 TeV. Physics Letters B, Elsevier, 2016, 762, pp.512-534. 〈10.1016/j.physletb.2016.10.007〉. 〈in2p3-01323689〉

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