Measurement of the cross section of high transverse momentum Z→bb production in proton-proton collisions at √s=8 TeV with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, M. Abolins, O. S. AbouZeid, H. Abramowicz, H. Abreu, R. Abreu, Y. Abulaiti, B. S. Acharya, L. Adamczyk, D. L. Adams, J. Adelman, S. Adomeit, T. Adye, T. Agatonovic-JovinJ. A. Aguilar-Saavedra, M. Agustoni, S. P. Ahlen, F. Ahmadov, G. Aielli, H. Akerstedt, T. P A Åkesson, G. Akimoto, A. V. Akimov, G. L. Alberghi, J. Albert, S. Albrand, M. J. Alconada Verzini, M. Aleksa, I. N. Aleksandrov, C. Alexa, G. Alexander, G. Alexandre, T. Alexopoulos, M. Alhroob, G. Alimonti, L. Alio, J. Alison, B. M M Allbrooke, L. J. Allison, P. P. Allport, K. Cranmer, A. Haas, A. I. Mincer, P. Nemethy, ATLAS Collaboration

    Research output: Contribution to journalArticle

    Abstract

    This Letter reports the observation of a high transverse momentum Z→bb signal in proton-proton col-lisions at √s=8TeVand the measurement of its production cross section. The data analysed were collected in 2012 with the ATLAS detector at the LHC and correspond to an integrated luminosity of 19.5fb-1. The Z→bb decay is reconstructed from a pair of b-tagged jets, clustered with the anti-kt jet algorithm with R =0.4, that have low angular separation and form a dijet with pT > 200GeV. The signal yield is extracted from a fit to the dijet invariant mass distribution, with the dominant, multi-jet back-ground mass shape estimated by employing a fully data-driven technique that reduces the dependence of the analysis on simulation. The fiducial cross section is determined to be σfid Z→bb =2.02±0.20(stat.) ±0.25(syst.) ±0.06(lumi.) pb=2.02±0.33pb, in good agreement with next-to-leading-order theoretical predictions.

    Original languageEnglish (US)
    Pages (from-to)25-43
    Number of pages19
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume738
    DOIs
    StatePublished - 2014

    Keywords

    • Boosted bb topologies
    • LHC

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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  • Cite this

    Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., Abi, B., 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., ... ATLAS Collaboration (2014). Measurement of the cross section of high transverse momentum Z→bb production in proton-proton collisions at √s=8 TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 738, 25-43. https://doi.org/10.1016/j.physletb.2014.09.020