Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton + jets final states produced in pp collisions at √ s = 8 TeV
Name
1-s2.0-S0370269316305780-main.pdf
Description
Published version
Size
857.16 KB
Format
Adobe PDF
Checksum (MD5)
12353ccdcb9e9b21c21b2e7ca64a2473
Author(s)
The CMS Collaboration
Date Issued
2016
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publisher
Elsevier BV
Citation
Khachatryan, V., 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 S=8tev." Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 762 (2016): 512-34.
Abstract
© 2016 The Author The W boson helicity fractions from top quark decays in tt‾ events are measured using data from proton–proton collisions at a centre-of-mass energy of 8TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8fb−1. 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 F0=0.681±0.012(stat)±0.023(syst), FL=0.323±0.008(stat)±0.014(syst), and FR=−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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2016.10.007
