Measurement of $B_c^+$ production in proton-proton collisions at $\sqrt{s}=8$ TeV

Information

LHCb-PAPER-2014-050
CERN-PH-EP-2014-269
arXiv:1411.2943 [PDF]

(Submitted on 11 Nov 2014)
Phys. Rev. Lett. 114 (2015) 132001
Inspire 1327230

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Abstract

Production of $B_c^+$ mesons in proton-proton collisions at a center-of-mass energy of 8 TeV is studied with data corresponding to an integrated luminosity of $2.0 {\rm fb}^{-1}$ recorded by the LHCb experiment. The ratio of production cross-sections times branching fractions between the $B_c^+\to J/\psi \pi^+$ and $B^+\to J/\psi K^+$ decays is measured as a function of transverse momentum and rapidity in the regions $0 < p_{\rm T} < 20 {\rm GeV}/c$ and $2.0 < y < 4.5$. The ratio in this kinematic range is measured to be $(0.683\pm0.018\pm0.009)\%$, where the first uncertainty is statistical and the second systematic.

Figures and captions

Invariant mass distribution of ({\it left}) $ B_c^+\rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \pi^+$ and ({\it right}) $ B ^+ \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K^+$ candidates with $2.0< p_{\rm T} <3.0 {\mathrm{ Ge V /}c} $ and $2.0<y<2.9$. The results of the fit described in the text are superimposed.	Fig1a.pdf [19 KiB] HiDef png [313 KiB] Thumbnail [287 KiB] *.C file
	Fig1b.pdf [25 KiB] HiDef png [274 KiB] Thumbnail [251 KiB] *.C file
	Fig2a.pdf [15 KiB] HiDef png [149 KiB] Thumbnail [152 KiB] *.C file
	Fig2b.pdf [16 KiB] HiDef png [144 KiB] Thumbnail [147 KiB] *.C file
Ratio $R( p_{\rm T},y)$ as a function of $ p_{\rm T} $ in the regions ({\it top}) $2.0<y<2.9$, ({\it middle}) $2.9<y<3.3$, and ({\it bottom}) $3.3<y<4.5$. The error bars on the data show the statistical and systematic uncertainties added in quadrature.	Fig3.pdf [17 KiB] HiDef png [120 KiB] Thumbnail [77 KiB] *.C file
Ratio ({\it left}) $R( p_{\rm T})$ as a function of $ p_{\rm T}$ integrated over $y$ in the region $2.0<y<$4.5 and ({\it right}) $R(y)$ as a function of $y$ integrated over $ p_{\rm T}$ in the region $0< p_{\rm T} <20 {\mathrm{ Ge V /}c} $. The error bars on the data show the statistical and systematic uncertainties added in quadrature.	Fig4a.pdf [13 KiB] HiDef png [64 KiB] Thumbnail [37 KiB] *.C file
	Fig4b.pdf [13 KiB] HiDef png [51 KiB] Thumbnail [30 KiB] *.C file
Ratio $R( p_{\rm T},y)$ as a function of $ p_{\rm T} $ in the regions $2.0<y<2.9$ ({\it top left}), $2.9<y<3.3$ ({\it top right}), and $3.3<y<4.5$ ({\it bottom left}), with theoretical predictions following the $\alpha_s^4$ approach [43] overlaid.	Fig5a.pdf [14 KiB] HiDef png [135 KiB] Thumbnail [132 KiB] *.C file
	Fig5b.pdf [14 KiB] HiDef png [134 KiB] Thumbnail [131 KiB] *.C file
	Fig5c.pdf [14 KiB] HiDef png [130 KiB] Thumbnail [128 KiB] *.C file
Ratio $R( p_{\rm T})$ as a function of $ p_{\rm T}$ integrated over $y$ in the region 2.0$<y<$4.5 ({\it left}) and $R(y)$ as a function of $y$ integrated over $ p_{\rm T}$ in the region 0$< p_{\rm T} <20 {\mathrm{ Ge V /}c} $ ({\it right}) are compared to the theoretical predictions following the $\alpha_s^4$ approach [43].	Fig6a.pdf [14 KiB] HiDef png [128 KiB] Thumbnail [125 KiB] *.C file
	Fig6b.pdf [14 KiB] HiDef png [102 KiB] Thumbnail [105 KiB] *.C file
Animated gif made out of all figures.	PAPER-2014-050.gif Thumbnail

Tables and captions

$R( p_{\rm T},y)$ in units of $10^{-2}$ as a function of $ p_{\rm T}$ and $y$. The first uncertainty is statistical and the second systematic.

Table_1.pdf [35 KiB]
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Supplementary Material [file]

Supplementary material full pdf	supple[..].pdf [201 KiB]
	Fig5a.pdf [14 KiB] HiDef png [135 KiB] Thumbnail [132 KiB] *C file
	Fig5b.pdf [14 KiB] HiDef png [134 KiB] Thumbnail [131 KiB] *C file
	Fig5c.pdf [14 KiB] HiDef png [130 KiB] Thumbnail [128 KiB] *C file
	Fig6a.pdf [14 KiB] HiDef png [128 KiB] Thumbnail [125 KiB] *C file
	Fig6b.pdf [14 KiB] HiDef png [102 KiB] Thumbnail [105 KiB] *C file