# First measurement of the forward-backward asymmetry in bottom-quark pair production at high mass

Aaltonen, T A; Amerio, S; Amidei, D E; et al; Canelli, F; Kilminster, B; CDF Collaboration (2015). First measurement of the forward-backward asymmetry in bottom-quark pair production at high mass. Physical Review D (Particles, Fields, Gravitation and Cosmology), 92:032006.

## Abstract

We measure the particle-level forward-backward production asymmetry in $b\bar{b}$ pairs with masses $m(b\bar{b})$ larger than 150 GeV/$c^2$, using events with hadronic jets and employing jet charge to distinguish $b$ from $\bar{b}$. The measurement uses $9.5 fb^{-1}$ of $p\bar{p}$ collisions at a center of mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of $m_{b\bar{b}}$ is consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200 GeV/$c^2$ whereas a model containing a heavier 345 GeV/$c^2$ axigluon is not excluded.

## Abstract

We measure the particle-level forward-backward production asymmetry in $b\bar{b}$ pairs with masses $m(b\bar{b})$ larger than 150 GeV/$c^2$, using events with hadronic jets and employing jet charge to distinguish $b$ from $\bar{b}$. The measurement uses $9.5 fb^{-1}$ of $p\bar{p}$ collisions at a center of mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of $m_{b\bar{b}}$ is consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200 GeV/$c^2$ whereas a model containing a heavier 345 GeV/$c^2$ axigluon is not excluded.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 26 March 2015 12 Feb 2016 15:45 14 Feb 2018 11:08 American Physical Society 1550-2368 Hybrid Publisher DOI. An embargo period may apply. https://doi.org/10.1103/PhysRevD.92.032006 arXiv:1504.06888v1