Evidence for Spin Correlation in tt¯ Production

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https://doi.org/10.1103/PhysRevLett.108.032004

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2012

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American Physical Society

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https://hdl.handle.net/2022/18547

Abstract

We present a measurement of the ratio of events with correlated t and t¯ spins to the total number of tt¯ events. This ratio f is evaluated using a matrix-element-based approach in 729 tt¯ candidate events with a single lepton ℓ (electron or muon) and at least four jets. The analyzed pp¯ collisions data correspond to an integrated luminosity of 5.3  fb−1 and were collected with the D0 detector at the Fermilab Tevatron collider operating at a center-of-mass energy s=1.96  TeV. Combining this result with a recent measurement of f in dileptonic final states, we find f in agreement with the standard model. In addition, the combination provides evidence for the presence of spin correlation in tt¯ events with a significance of more than 3 standard deviations.

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Center-of-mass energies, Fermilab Tevatron collider, Final state, Integrated luminosity, Standard deviation, The standard model, Atomic physics, Physics, Tellurium compounds, Spin correlations

Citation

Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Alexeev, G. D., . . . Zivkovic, L. (2012). Evidence for spin correlation in tt¯ production. Physical Review Letters, 108(3), 032004. http://dx.doi.org/10.1103/PhysRevLett.108.032004

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© 2012 American Physical Society.

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Faculty Publications and Research