Fiducial cross-sections for tt¯ production with one or two additional b -jets are reported, using an integrated luminosity of 20.3 fb–1 of proton–proton collisions at a centre-of-mass energy of 8 TeV at the Large Hadron Collider, collected with the ATLAS detector. The cross-section times branching ratio for tt¯ events with at least one additional b-jet is measured to be 950 ± 70 (stat.) +240-190 (syst.) fb in the lepton-plus-jets channel and 50 ± 10 (stat.) +15-10 (syst.) fb in the eμ channel. The cross-section times branching ratio for events with at least two additional b -jets is measured to be 19.3 ± 3.5 (stat.) ± 5.7 (syst.) fb in the dilepton channel ( eμ , μμ , and ee ) using a method based on tight selection criteria, and 13.5 ± 3.3 (stat.) ± 3.6 (syst.) fb using a looser selection that allows the background normalisation to be extracted from data. The latter method also measures a value of 1.30 ± 0.33 (stat.) ± 0.28 (syst.)% for the ratio of tt¯ production with two additional b-jets to tt¯ production with any two additional jets. As a result, all measurements are in good agreement with recent theory predictions.
Aad, G., et al. "Measurements of fiducial cross-sections for tt¯ production with one or two additional b-jets in pp collisions at √s = 8 TeV using the ATLAS detector." European Physical Journal. C, Particles and Fields, vol. 76, no. 1, Jan. 2016. https://doi.org/10.1140/epjc/s10052-015-3852-4
Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., Adye, T., Affolder, A. A., ... Zwalinski, L. (2016). Measurements of fiducial cross-sections for tt¯ production with one or two additional b-jets in pp collisions at √s = 8 TeV using the ATLAS detector. European Physical Journal. C, Particles and Fields, 76(1). https://doi.org/10.1140/epjc/s10052-015-3852-4
Aad, G., Abbott, B., Abdallah, J., et al., "Measurements of fiducial cross-sections for tt¯ production with one or two additional b-jets in pp collisions at √s = 8 TeV using the ATLAS detector," European Physical Journal. C, Particles and Fields 76, no. 1 (2016), https://doi.org/10.1140/epjc/s10052-015-3852-4
@article{osti_1238340,
author = {Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Aben, R. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Abreu, R. and others},
title = {Measurements of fiducial cross-sections for tt¯ production with one or two additional b-jets in pp collisions at √s = 8 TeV using the ATLAS detector},
annote = {Fiducial cross-sections for tt¯ production with one or two additional b -jets are reported, using an integrated luminosity of 20.3 fb–1 of proton–proton collisions at a centre-of-mass energy of 8 TeV at the Large Hadron Collider, collected with the ATLAS detector. The cross-section times branching ratio for tt¯ events with at least one additional b-jet is measured to be 950 ± 70 (stat.) +240-190 (syst.) fb in the lepton-plus-jets channel and 50 ± 10 (stat.) +15-10 (syst.) fb in the eμ channel. The cross-section times branching ratio for events with at least two additional b -jets is measured to be 19.3 ± 3.5 (stat.) ± 5.7 (syst.) fb in the dilepton channel ( eμ , μμ , and ee ) using a method based on tight selection criteria, and 13.5 ± 3.3 (stat.) ± 3.6 (syst.) fb using a looser selection that allows the background normalisation to be extracted from data. The latter method also measures a value of 1.30 ± 0.33 (stat.) ± 0.28 (syst.)% for the ratio of tt¯ production with two additional b-jets to tt¯ production with any two additional jets. As a result, all measurements are in good agreement with recent theory predictions.},
doi = {10.1140/epjc/s10052-015-3852-4},
url = {https://www.osti.gov/biblio/1238340},
journal = {European Physical Journal. C, Particles and Fields},
issn = {ISSN 1434-6044},
number = {1},
volume = {76},
place = {United States},
publisher = {Springer},
year = {2016},
month = {01}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3https://doi.org/10.1016/S0168-9002(03)01368-8