Evidence for Spin Correlation in $t\bar{t}$ Production
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Date
2012
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American Physical Society
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Abstract
We present a measurement of the ratio of events with correlated $t$ and $\bar{t}$ spins to the total number of $t\bar{t}$ events. This ratio $f$ is evaluated using a matrix-element-based approach in 729 $t\bar{t}$ candidate events with a single lepton ℓ (electron or muon) and at least four jets. The analyzed $p\bar{p}$ collisions data correspond to an integrated luminosity of $5.3 \text{ fb}^{−1}$ and were collected with the D0 detector at the Fermilab Tevatron collider operating at a center-of-mass energy $\sqrt s=1.96 \text{TeV}$. 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 $t\bar{t}$ 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 $t\bar{t}$ 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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Article