Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton + jets final states produced in pp collisions at
The W boson helicity fractions from top quark decays in $$t\bar{t}$$ 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 19.8 fb-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. Furthermore, these measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1329074
- Alternate ID(s):
- OSTI ID: 1289931
- Report Number(s):
- FERMILAB-PUB-16-192-CMS; CMS-TOP-13-008; CERN-EP-2016-118; arXiv:1605.09047; S0370269316305780; PII: S0370269316305780
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 762 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
Top-quark physics at the Large Hadron Collider
|
journal | May 2017 |
W boson polarization in vector boson scattering at the LHC
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conference | March 2018 |
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