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Colored bosons on top FBA and angular cross section for $t \bar t$ production

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 $|\Delta y|$ and $t\bar t$ invariant mass $M_{t\bar t}$. Beside the sustained inconsistency between experiments and standard model (SM) predictions at large $|\Delta y|$ and $M_{t\bar t}$, an unexpected large first Legendre moment with $a_1= 0.39\pm 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 $|\Delta y| >1$ and $M_{t\bar t} > 450$ GeV in triplet and octet model could be enhanced to be around 30% and 20%, whereas the first Legendre moment is $a^{\bf Di}_1= 0.38$ and $a^{\bf Axi}_1= 0.23$, respectively.
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Submitted on : Monday, November 25, 2013 - 3:29:50 PM
Last modification on : Friday, November 6, 2020 - 3:30:07 AM

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R. Benbrik, Chuan-Hung Chen, M. El Kacimi. Colored bosons on top FBA and angular cross section for $t \bar t$ production. Physics Letters B, Elsevier, 2013, 725, pp.372-377. ⟨10.1016/j.physletb.2013.07.057⟩. ⟨in2p3-00908975⟩



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