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Evidence for a mass dependent forward-backward asymmetry in top quark pair production

Aaltonen T.
•
Álvarez González B.
•
Amerio S.
altro
Zucchelli S.
2011
  • journal article

Periodico
PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY
Abstract
We present a new measurement of the inclusive forward-backward tt ̄ production asymmetry and its rapidity and mass dependence. The measurements are performed with data corresponding to an integrated luminosity of 5.3 fb−1 of pp ̄ collisions at s√=1.96 TeV, recorded with the CDF-II Detector at the Fermilab Tevatron. Significant inclusive asymmetries are observed in both the laboratory frame and the tt ̄ rest frame, and in both cases are found to be consistent with CP conservation under interchange of t and t ̄. In the tt ̄ rest frame, the asymmetry is observed to increase with the tt ̄ rapidity difference, Δy, and with the invariant mass Mtt ̄ of the tt ̄ system. Fully corrected parton-level asymmetries are derived in two regions of each variable, and the asymmetry is found to be most significant at large Δy and Mtt ̄. For Mtt ̄≥450 GeV/c2, the parton-level asymmetry in the tt ̄ rest frame is Att ̄=0.475±0.114 compared to a next-to-leading order QCD prediction of 0.088±0.013.
DOI
10.1103/PhysRevD.83.112003
WOS
WOS:000291398900002
Archivio
http://hdl.handle.net/11390/982746
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-79960812380
http://journals.aps.org/prd/pdf/10.1103/PhysRevD.83.112003
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Data di acquisizione
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