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Measurement of the $b$-quark production cross-section in 7 and 13 TeV $pp$ collisions


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Measurement of the $b$-quark production cross-section in 7 and 13 TeV $pp$ collisions. Physical Review Letters, 118(5):052002.

Abstract

Measurements of the cross section for producing b quarks in the reaction $pp \to b\overline{b}X$ are reported in 7 and 13 TeV collisions at the LHC as a function of the pseudorapidity $\eta$ in the range $2 < \eta < 5$ covered by the acceptance of the LHCb experiment. The measurements are done using semileptonic decays of $b$-flavored hadrons decaying into a ground-state charmed hadron in association with a muon. The cross sections in the covered $\eta$ range are $72.0 \pm 0.3 \pm 6.8$ and $154.3 \pm 1.5 \pm 14.3 \mu b$ for 7 and 13 TeV. The ratio is $2.14 \pm 0.02 \pm 0.13$, where the quoted uncertainties are statistical and systematic, respectively. The agreement with theoretical expectation is good at 7 TeV, but differs somewhat at 13 TeV. The measured ratio of cross sections is larger at lower $\eta$ than the model prediction.

Abstract

Measurements of the cross section for producing b quarks in the reaction $pp \to b\overline{b}X$ are reported in 7 and 13 TeV collisions at the LHC as a function of the pseudorapidity $\eta$ in the range $2 < \eta < 5$ covered by the acceptance of the LHCb experiment. The measurements are done using semileptonic decays of $b$-flavored hadrons decaying into a ground-state charmed hadron in association with a muon. The cross sections in the covered $\eta$ range are $72.0 \pm 0.3 \pm 6.8$ and $154.3 \pm 1.5 \pm 14.3 \mu b$ for 7 and 13 TeV. The ratio is $2.14 \pm 0.02 \pm 0.13$, where the quoted uncertainties are statistical and systematic, respectively. The agreement with theoretical expectation is good at 7 TeV, but differs somewhat at 13 TeV. The measured ratio of cross sections is larger at lower $\eta$ than the model prediction.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:02 Feb 2018 14:36
Last Modified:19 Feb 2018 10:45
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/PhysRevLett.118.052002

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