First Measurement of the Forward-backward Asymmetry in Bottom-quark Pair Production at High Mass
Author | : |
Publisher | : |
Total Pages | : 11 |
Release | : 2015 |
ISBN-10 | : OCLC:925453571 |
ISBN-13 | : |
Rating | : 4/5 (71 Downloads) |
Download or read book First Measurement of the Forward-backward Asymmetry in Bottom-quark Pair Production at High Mass written by and published by . This book was released on 2015 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the particle-level forward-backward production asymmetry in $\mathrm{b\bar{b}}$ pairs with masses (m$\mathrm{b\bar{b}}$) larger than 150 GeV/c2, using events with hadronic jets and employing jet charge to distinguish b from $\bar{b}$. The measurement uses 9.5 fb-1 of $\mathrm{p\bar{p}}$ collisions at a center-of-mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of m$\mathrm{b\bar{b}}$ 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/c2, whereas a model containing a heavier 345 GeV/c2 axigluon is not excluded.