Abstract
With full data set that corresponds to an integrated luminosity of 9.4 fb−1, CDF has updated the top-quark forward–backward asymmetry (FBA) as functions of rapidity difference |Δy| and tt¯ invariant mass Mtt¯. Beside the sustained inconsistency between experiments and standard model (SM) predictions at large |Δy| and Mtt¯, an unexpected large first Legendre moment with a1=0.39±0.108 is found. In order to solve the large top FBA, we study the contributions of color triplet scalar and color octet vector boson. We find that the top FBA at |Δy|>1 (Mtt¯>450 GeV) in triplet and octet model could be enhanced to be around 40% (30%) and 26% (20%), whereas the first Legendre moment is a1Di=0.38 and a1Axi=0.23, respectively.
Highlights
With full data set that corresponds to an integrated luminosity of 9.4 fb−1, CDF has updated the top quark forward-backward asymmetry (FBA) as functions of rapidity difference |∆y| and ttinvariant mass Mtt
In order to solve the large top FBA, we study the contributions of color triplet scalar and color octet vector boson
We find that the top FBA at |∆y| > 1 (Mtt > 450 GeV) in triplet and octet model could be enhanced to be around 40% (30%) and 26% (20%), whereas the first Legendre moment is aD1 i = 0.38 and aA1 xi = 0.23, respectively
Summary
It is believed that the standard model (SM) is just an effective theory of a fundamental one yet to be discovered, even it is consistent with most experimental data. Colored bosons on top FBA and angular cross section for ttproduction We find that the top FBA at |∆y| > 1 (Mtt > 450 GeV) in triplet and octet model could be enhanced to be around 40% (30%) and 26% (20%), whereas the first Legendre moment is aD1 i = 0.38 and aA1 xi = 0.23, respectively.
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