Measurement of the forward-backward asymmetry in $\Lambda_b^0$ and $\overline \Lambda_b^0$ baryon production in $p \overline p$ collisions at $\sqrt s =1.96$ TeV
- Abazov, Victor Mukhamedovich et al
- arXiv:1503.03917FERMILAB-PUB-15-080-E
 | (color online) Invariant mass distribution of $\Lambda_b^0\rightarrow J/\psi \Lambda$ and $\overline \Lambda_b^0\rightarrow J/\psi \overline \Lambda$ candidates in the rapidity range $0.5<|y|<1.0$ in the (a) forward and (b) backward categories. The fit of a Gaussian signal function with a second-order Chebyshev polynomial background function is superimposed. The vertical lines define the signal region. |
 | (color online) Invariant mass distribution of $\Lambda_b^0\rightarrow J/\psi \Lambda$ and $\overline \Lambda_b^0\rightarrow J/\psi \overline \Lambda$ candidates in the rapidity range $0.5<|y|<1.0$ in the (a) forward and (b) backward categories. The fit of a Gaussian signal function with a second-order Chebyshev polynomial background function is superimposed. The vertical lines define the signal region. |
 | (color online) Measured forward-backward asymmetry $A$ versus rapidity $|y|$ compared to predictions of the Heavy Quark Recombination model~\cite{hqr} and a simulated effect of the longitudinal momentum shift due to beam drag (see Ref.~\cite{rosner} and text). The background asymmetry is obtained from $J/\psi \Lambda$ candidates in the $\Lambda_b^0$ mass sidebands (uncertainties are small compared to the symbol size). Measurements are placed at the centers of the rapidity intervals defined in Table~\ref{tab:ratio}. |
 | Measured ratio of the backward to forward production cross sections versus rapidity loss compared to the $\overline \Lambda_b^0$ to $ \Lambda_b^0$ production cross section ratio at CMS taken from Table II of Ref.~\cite{cms}. Measurements are placed at the centers of their rapidity loss ranges. |