Aaltonen, T;
Amerio, S;
Amidei, D;
Anastassov, A;
Annovi, A;
Antos, J;
Apollinari, G;
... Zucchelli, S; + view all
(2018)
Search for Standard-model Z and Higgs Bosons Decaying Into a Bottom-antibottom Quark Pair in Proton-antiproton Collisions at 1.96 TeV.
Physical Review D
, 98
, Article 072002. 10.1103/PhysRevD.98.072002.
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Abstract
The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (pp¯) collisions with a vertex displaced from the pp¯ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb−1, is used to measure the Z-boson production cross section times branching ratio into bb¯. The number of Z → bb¯ events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σðpp¯ → ZÞ × BðZ → bb¯Þ ¼ 1.11 0.08ðstatÞ 0.14ðsystÞ nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive pp¯ → H → bb¯ process at ffiffi s p ¼ 1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or σ ¼ 40.6 pb, at the 95% confidence level.
| Type: | Article |
|---|---|
| Title: | Search for Standard-model Z and Higgs Bosons Decaying Into a Bottom-antibottom Quark Pair in Proton-antiproton Collisions at 1.96 TeV |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevD.98.072002 |
| Publisher version: | https://doi.org/10.1103/PhysRevD.98.072002 |
| Language: | English |
| Additional information: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10059902 |
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