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Measurement of the $B^{\pm}$ production cross-section in $pp$ collisions at $\sqrt{s}$ = 7 and 13 TeV


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Measurement of the $B^{\pm}$ production cross-section in $pp$ collisions at $\sqrt{s}$ = 7 and 13 TeV. Journal of High Energy Physics, 12:026.

Abstract

The production of $B^{\pm}$ mesons is studied in pp collisions at centre-of-mass energies of 7 and 13 TeV, using $B^{\pm} \to J/\psi K^{\pm}$ decays and data samples corresponding to 1.0 $fb^{−1}$ and 0.3 $fb^{−1}$, respectively. The production cross-sections summed over both charges and integrated over the transverse momentum range $0 < p_T < 40 GeV/c$ and the rapidity range $2.0 < y < 4.5$ are measured to be
$\sigma (pp \to B^{\pm}X,\sqrt{s} = 7 TeV) = 43.0 \pm 0.2 \pm 2.5 \pm 1.7 \mu b$,
$\sigma (pp \to B^{\pm}X,\sqrt{s} = 13 TeV) = 86.6 \pm 0.5 \pm 5.4 \pm 3.4 \mu b$,
where the first uncertainties are statistical, the second are systematic, and the third are due to the limited knowledge of the $B^{\pm} \to J/\psi K^{\pm}$ branching fraction. The ratio of the cross-section at 13 TeV to that at 7 TeV is determined to be $2.02 \pm 0.02 (stat) \pm 0.12 (syst)$. Differential cross-sections are also reported as functions of $p_T$ and $y$. All results are in agreement with theoretical calculations based on the state-of-art fixed next-to-leading order quantum chromodynamics.

Abstract

The production of $B^{\pm}$ mesons is studied in pp collisions at centre-of-mass energies of 7 and 13 TeV, using $B^{\pm} \to J/\psi K^{\pm}$ decays and data samples corresponding to 1.0 $fb^{−1}$ and 0.3 $fb^{−1}$, respectively. The production cross-sections summed over both charges and integrated over the transverse momentum range $0 < p_T < 40 GeV/c$ and the rapidity range $2.0 < y < 4.5$ are measured to be
$\sigma (pp \to B^{\pm}X,\sqrt{s} = 7 TeV) = 43.0 \pm 0.2 \pm 2.5 \pm 1.7 \mu b$,
$\sigma (pp \to B^{\pm}X,\sqrt{s} = 13 TeV) = 86.6 \pm 0.5 \pm 5.4 \pm 3.4 \mu b$,
where the first uncertainties are statistical, the second are systematic, and the third are due to the limited knowledge of the $B^{\pm} \to J/\psi K^{\pm}$ branching fraction. The ratio of the cross-section at 13 TeV to that at 7 TeV is determined to be $2.02 \pm 0.02 (stat) \pm 0.12 (syst)$. Differential cross-sections are also reported as functions of $p_T$ and $y$. All results are in agreement with theoretical calculations based on the state-of-art fixed next-to-leading order quantum chromodynamics.

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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:01 Feb 2018 13:00
Last Modified:19 Feb 2018 10:45
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP12(2017)026

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