Measurement of spin correlation in ttbar production using a matrix element approach
We determine the fraction of t{bar t} events with spin correlation, assuming that the spin of the top quark is either correlated with the spin of the anti-top quark as predicted by the standard model or is uncorrelated. For the first time we use a matrix-element-based approach to study t{bar t} spin correlation. We use t{bar t} {yields} W{sup +}bW{sup -}{bar b} {yields} {ell}{sup +} {nu}b{ell}{sup -}{bar {nu}}{bar b} final states produced in p{bar p} collisions at a center of mass energy {radical}s = 1.96 TeV, where {ell} denotes an electron or a muon. The data correspond to an integrated luminosity of 5.4 fb{sup -1} and were collected with the D0 detector at the Fermilab Tevatron collider. The result agrees with the standard model prediction. We exclude the hypothesis that the spins of the t{bar t} are uncorrelated at the 97.7% C.L.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1013144
- Report Number(s):
- FERMILAB-PUB-11-196-E; arXiv eprint number arXiv:1104.5194; TRN: US1102416
- Journal Information:
- Submitted to Phys.Rev.Lett., Journal Name: Submitted to Phys.Rev.Lett.
- Country of Publication:
- United States
- Language:
- English
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