Measurement of $B$ meson production cross-sections in proton-proton collisions at $\sqrt{s}=$ 7 TeV

Information

LHCb-PAPER-2013-004
CERN-PH-EP-2013-095
arXiv:1306.3663 [PDF]

(Submitted on 16 Jun 2013)
JHEP 08 (2013) 117
Inspire 1238809

Tools

Abstract

The production cross-sections of B mesons are measured in pp collisions at a centre-of-mass energy of 7 TeV, using data collected with the LHCb detector corresponding to a integrated luminosity of 0.36 fb-1. The B+, B0 and Bs0 mesons are reconstructed in the exclusive decays B+ -> J/psi K+, B0 -> J/psi K*0 and Bs0 -> J/psi phi, with J/psi -> mu+ mu-, K*0 -> K+ pi- and phi -> K+ K-. The differential cross-sections are measured as functions of B meson transverse momentum pT and rapidity y, in the range 0 < pT < 40 GeV/c and 2.0 < y < 4.5. The integrated cross-sections in the same pT and y ranges, including charge-conjugate states, are measured to be sigma(pp -> B+ + X) = 38.9 +- 0.3 (stat.) +- 2.5 (syst.) +- 1.3 (norm.) mub, sigma(pp -> B0 + X) = 38.1 +- 0.6 (stat.) +- 3.7 (syst.) +- 4.7 (norm.) mub, sigma(pp -> Bs0 + X) = 10.5 +- 0.2 (stat.) +- 0.8 (syst.) +- 1.0 (norm.) mub, where the third uncertainty arises from the pre-existing branching fraction measurements.

Figures and captions

Invariant mass distributions of the selected candidates for ({\it top left}) $ B^{\rm +}$ and ({\it top right}) $ B^{\rm 0}$ decays, both in the range $4.5< p_{\rm T}<5.0\; {\mathrm{ Ge V /}c} $, $3.0<y<3.5$, and ({\it bottom}) $ B^{\rm 0}_s$ decay in the range $4.0< p_{\rm T}<5.0\; {\mathrm{ Ge V /}c} $, $3.0<y<3.5$. The results of the fit to the model described in the text are superimposed. The Cabibbo-suppressed background is barely visible in the top left plot.	Fig1a.pdf [25 KiB] HiDef png [317 KiB] Thumbnail [277 KiB] *.C file
	Fig1b.pdf [19 KiB] HiDef png [306 KiB] Thumbnail [263 KiB] *.C file
	Fig1c.pdf [22 KiB] HiDef png [275 KiB] Thumbnail [237 KiB] *.C file
Differential production cross-sections for ({\it top}) $ B^{\rm +}$ , ({\it middle}) $ B^{\rm 0}$ and ({\it bottom}) $ B^{\rm 0}_s$ \ mesons, as functions of $ p_{\rm T}$ \ for each $y$ interval.	Fig2a.pdf [21 KiB] HiDef png [223 KiB] Thumbnail [207 KiB] *.C file
	Fig2b.pdf [19 KiB] HiDef png [200 KiB] Thumbnail [195 KiB] *.C file
	Fig2c.pdf [18 KiB] HiDef png [186 KiB] Thumbnail [189 KiB] *.C file
Differential production cross-sections for ({\it top}) $ B^{\rm +}$ , ({\it middle}) $ B^{\rm 0}$ and ({\it bottom}) $ B^{\rm 0}_s$ \ mesons, as functions of $ p_{\rm T}$ \ integrated over the whole $y$ range. The open circles with error bars are the measurements (not including uncertainties from normalisation channel branching fractions and luminosity) and the blue shaded areas are the uncertainties from the branching fractions. The red dashed lines are the upper and lower uncertainty limits of the FONLL computation [3].	Fig3a.pdf [17 KiB] HiDef png [192 KiB] Thumbnail [176 KiB] *.C file
	Fig3b.pdf [16 KiB] HiDef png [219 KiB] Thumbnail [189 KiB] *.C file
	Fig3c.pdf [16 KiB] HiDef png [213 KiB] Thumbnail [184 KiB] *.C file
Differential production cross-sections for ({\it top}) $ B^{\rm +}$ , ({\it middle}) $ B^{\rm 0}$ and ({\it bottom}) $ B^{\rm 0}_s$ \ mesons, as functions of $y$ integrated over the whole $ p_{\rm T}$ range. The black open circles with error bars are the measurements (not including uncertainties from normalisation channel branching fractions and luminosity) and the blue shaded areas are the uncertainties from the branching fractions. The red dashed lines are the upper and lower uncertainty limits of the FONLL computation [3].	Fig4a.pdf [14 KiB] HiDef png [185 KiB] Thumbnail [163 KiB] *.C file
	Fig4b.pdf [14 KiB] HiDef png [260 KiB] Thumbnail [195 KiB] *.C file
	Fig4c.pdf [14 KiB] HiDef png [232 KiB] Thumbnail [180 KiB] *.C file
Animated gif made out of all figures.	PAPER-2013-004.gif Thumbnail