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Title: Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV

Journal Article · · Physical Review D
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Here, the Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation ($$b$$-jets) by selecting online proton-antiproton ($$p\bar{p}$$) collisions with a vertex displaced from the $$p\bar{p}$$ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of $$\sqrt{s}=$$1.96 TeV, and corresponding to an integrated luminosity of $$5.4~\rm{fb}^{-1}$$, is used to measure the $$Z$$-boson production cross section times branching ratio into $$b\bar{b}$$. The number of $$Z\rightarrow b\bar{b}$$ 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, $$\sigma(p\bar{p} \rightarrow Z) \times \mathcal{B}(Z \rightarrow b\bar{b})= 1.11\pm 0.08(\text{stat}) \pm 0.14(\text{syst})~\text{nb}$$, 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 $$p\bar p \rightarrow H\rightarrow b\bar b$$ process at $$\sqrt{s}=$$1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or $$\sigma = 40.6$$ pb, at the 95\% confidence level.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE
Contributing Organization:
CDF Collaboration
Grant/Contract Number:
AC02-07CH11359; AC02-05CH11231
OSTI ID:
1477567
Alternate ID(s):
OSTI ID: 1463624; OSTI ID: 1550826
Report Number(s):
FERMILAB-PUB-18-307-E-PPD; arXiv:1807.01363; PRVDAQ; 1680821; TRN: US1902320
Journal Information:
Physical Review D, Vol. 98, Issue 7; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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