Measurement of the production cross section in the all-jet final state in pp collisions at
A measurement of the production cross section of top quark pairs in association with two b jets ($$\mathrm{t\bar{t}}\mathrm{b\bar{b}}$$) is presented using data collected in proton-proton collisions at $$\sqrt{s} =$$ 13 TeV by the CMS detector at the LHC corresponding to an integrated luminosity of 35.9 fb$$^{-1}$$. The cross section is measured in the all-jet decay channel of the top quark pair by selecting events containing at least eight jets, of which at least two are identified as originating from the hadronization of b quarks. A combination of multivariate analysis techniques is used to reduce the large background from multijet events not containing a top quark pair, and to help discriminate between jets originating from top quark decays and other additional jets. The cross section is determined for the total phase space to be 5.5 $$\pm$$ 0.3 (stat)$${}^{+1.6}_{-1.3}$$ (syst) pb and also measured for two fiducial $$\mathrm{t\bar{t}}\mathrm{b\bar{b}}$$ definitions. The measured cross sections are found to be larger than theoretical predictions by a factor of 1.5-2.4, corresponding to 1-2 standard deviations.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359; SC0010005
- OSTI ID:
- 1599972
- Alternate ID(s):
- OSTI ID: 1568852; OSTI ID: 1637422
- Report Number(s):
- FERMILAB-PUB-19-500-CMS; arXiv:1909.05306; CMS-TOP-18-011; CERN-EP-2019-183; S0370269320300897; 135285; PII: S0370269320300897
- Journal Information:
- Physics Letters. B, Journal Name: Physics Letters. B Vol. 803 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
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