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

CMS; Beluffi, Camille; Bondu, Olivier; Brochet, Sébastien; Bruno, Giacomo; Caudron, Adrien; Ceard, Ludivine; de Visscher, Simon; Delaere, Christophe; Delcourt, Martin; Forthomme, Laurent; François, Brieuc; Giammanco, Andrea; Jafari, Abideh; Jez, Pavel; Komm, Matthias; Lemaitre, Vincent; Magitteri, Alessio; Mertens, Alexandre; Musich, Marco

doi:10.1016/j.physletb.2016.10.007

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

CMS

;

Beluffi, Camille

;

Bondu, Olivier

;

Brochet, Sébastien

;

Wertz, Sébastien

;et.al.

(2016) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B762, p. 512-534 (2016)

Files

160509047.pdf

Open Access
Adobe PDF
603.85 KB

Download

Details

Authors

CMSUCLouvain
Author
Beluffi, CamilleUCLouvain
Author
Bondu, OlivierUCLouvain
Author
Brochet, SébastienUCLouvain
Author
Bruno, GiacomoUCLouvain
Author
Caudron, AdrienUCLouvain
Author
Ceard, LudivineUCLouvain
Author
de Visscher, SimonUCLouvain
Author
Delaere, ChristopheUCLouvain
Author
Delcourt, MartinUCLouvain
Author
Forthomme, LaurentUCLouvain
Author
François, BrieucUCLouvain
Author
Giammanco, AndreaUCLouvain
Author
Jafari, AbidehUCLouvain
Author
Jez, PavelUCLouvain
Author
Komm, MatthiasUCLouvain
Author
Lemaitre, VincentUCLouvain
Author
Magitteri, AlessioUCLouvain
Author
Mertens, AlexandreUCLouvain
Author
Musich, MarcoUCLouvain
Author
Nuttens, ClaudeUCLouvain
Author
Piotrzkowski, KrzysztofUCLouvain
Author
Quertenmont, LoïcUCLouvain
Author
Selvaggi, MicheleUCLouvain
Author
Vidal Maroño, MiguelUCLouvain
Author
Wertz, SébastienUCLouvain
Author
et. al.

Abstract

The W boson helicity fractions from top quark decays in t t-bar 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.

Affiliations

UCLouvainSST/IRMP - Institut de recherche en mathématique et physique

Citations

APA
Chicago
FWB

CMS, Beluffi, C., Bondu, O., Brochet, S., Bruno, G., Caudron, A., Ceard, L., de Visscher, S., Delaere, C., Delcourt, M., Forthomme, L., François, B., Giammanco, A., Jafari, A., Jez, P., Komm, M., Lemaitre, V., Magitteri, A., Mertens, A., et al. (2016). 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. Section B: Nuclear, Elementary Particle and High-Energy Physics, B762, 512-534. https://doi.org/10.1016/j.physletb.2016.10.007 (Original work published 2016)