Measurement of the helicity fractions of W bosons from top quark decays using fully reconstructed t anti-t events with CDF II
Creators
- Abulencia, A.
- Adelman, J.
- Affolder, T.
- Akimoto, T.
- Albrow, M.G.
- Ambrose, D.
- Amerio, S.
- Amidei, D.
- Anastassov, A.
- Anikeev, K.
- Annovi, A.
- Antos, J.
- Aoki, M.
- Apollinari, G.
- Arguin, J.-F.
- Arisawa, T.
- Artikov, A.
- Ashmanskas, W.
- Attal, A.
- Azfar, F.
- Azzi-Bacchetta, P.
- Taiwan, Inst. Phys.
- Argonne
- Barcelona, IFAE
- Baylor U.
- INFN, Bologna
- Bologna U.
- Brandeis U.
- UC, Davis
- UCLA
- UC, San Diego
- UC, Santa Barbara
- Cantabria Inst. of Phys.
- Carnegie Mellon U.
- Chicago U., EFI
- Comenius U.
- Kosice, IEF
- Dubna, JINR
- Duke U.
- Florida U.
- Frascati
- Fermi National Accelerator Lab., Batavia, IL (United States)
Description
The authors present a measurement of the fractions F0 and F+ of longitudinally polarized and right-handed W bosons in top quark decays using data collected with the CDF II detector. The data set used in the analysis corresponds to an integrated luminosity of approximately 318 pb-1. They select t(bar t) candidate events with one lepton, at least four jets, and missing transverse energy. The helicity measurement uses the decay angle θ*, which is defined as the angle between the momentum of the charged lepton in the W boson rest frame and the W momentum in the top quark rest frame. The cos θ* distribution in the data is determined by full kinematic reconstruction of the t(bar t) candidates. They find F0 0.85-0.22+0.15(stat)±0.06(syst) and F+ 0.05-0.05+0.11(stat) ± 0.03(syst), which is consistent with the standard model prediction. They set an upper limit on the fraction of right-handed W bosons of F+ < 0.26 at the 95% confidence level
Availability note (English)
Available from http://lss.fnal.gov/cgi-bin/find_paper.pl?pub-06-461.pdf; PURL: https://www.osti.gov/servlets/purl/900373-1uXBls/Additional details
Identifiers
Publishing Information
- Imprint Pagination
- 11 p.
- Report number
- FERMILAB-PUB--06-461-E
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 38067929
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Resource subtype / Literary indicator
- Non-conventional Literature
- Descriptors DEI
- DECAY; DISTRIBUTION; FERMILAB COLLIDER DETECTOR; FORECASTING; HELICITY; INTERMEDIATE BOSONS; LEPTONS; LUMINOSITY; STANDARD MODEL; T QUARKS; TRANSVERSE ENERGY
- Descriptors DEC
- BOSONS; ELEMENTARY PARTICLES; ENERGY; FERMIONS; FIELD THEORIES; GRAND UNIFIED THEORY; KINETIC ENERGY; MATHEMATICAL MODELS; MEASURING INSTRUMENTS; OPTICAL PROPERTIES; PARTICLE MODELS; PARTICLE PROPERTIES; PHYSICAL PROPERTIES; POSTULATED PARTICLES; QUANTUM FIELD THEORY; QUARKS; RADIATION DETECTORS; TOP PARTICLES; UNIFIED GAUGE MODELS
Optional Information
- Contract/Grant/Project number
- arXiv eprint number HEP-EX--0612011; AC02-76CH03000
- Funding organization
- US Department of Energy (United States)