Measurement of the branching fraction ratio $\mathcal{B}(B_c^+ \rightarrow \psi(2S)\pi^+)/\mathcal{B}(B_c^+ \rightarrow J/\psi \pi^+)$

Information

LHCb-PAPER-2015-024
CERN-PH-EP-2015-167
arXiv:1507.03516 [PDF]

(Submitted on 13 Jul 2015)
Phys. Rev. D92 (2015) 072007
Inspire 1382599

Tools

Abstract

Using $pp$ collision data collected by LHCb at center-of-mass energies $\sqrt{s}$ = 7 TeV and 8 TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$, the ratio of the branching fraction of the $B_c^+ \rightarrow \psi(2S)\pi^+$ decay relative to that of the $B_c^+ \rightarrow J/\psi\pi^+$ decay is measured to be 0.268 $\pm$ 0.032 (stat) $\pm$ 0.007 (syst) $\pm$ 0.006 (BF). The first uncertainty is statistical, the second is systematic, and the third is due to the uncertainties on the branching fractions of the $J/\psi \rightarrow \mu^+\mu^-$ and $\psi(2S) \rightarrow \mu^+\mu^-$ decays. This measurement is consistent with the previous LHCb result, and the statistical uncertainty is halved.

Figures and captions

Fit to the reconstructed $ B _ c ^+ $ mass distribution for $ B _ c ^+ \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \pi^+$ using (top) 2011 and (bottom) 2012 data samples. The plots on the left (right) correspond to the data selected with \text{BDT1} (\text{BDT2}). Black points with error bars represent the data, and the various components are indicated in the keys.	fig1a.pdf [22 KiB] HiDef png [308 KiB] Thumbnail [255 KiB] *.C file
	fig1b.pdf [22 KiB] HiDef png [315 KiB] Thumbnail [262 KiB] *.C file
	fig1c.pdf [22 KiB] HiDef png [303 KiB] Thumbnail [244 KiB] *.C file
	fig1d.pdf [22 KiB] HiDef png [307 KiB] Thumbnail [250 KiB] *.C file
Fit to the reconstructed $ B _ c ^+ $ mass distribution for $ B _ c ^+ \rightarrow \psi {(2S)} \pi^+$ using (top) 2011 and (bottom) 2012 data samples. The plots on the left (right) correspond to the data selected with \text{BDT1} (\text{BDT2}). Black points with error bars represent the data, and the various components are indicated in the keys.	fig2a.pdf [20 KiB] HiDef png [269 KiB] Thumbnail [234 KiB] *.C file
	fig2b.pdf [21 KiB] HiDef png [291 KiB] Thumbnail [246 KiB] *.C file
	fig2c.pdf [21 KiB] HiDef png [301 KiB] Thumbnail [264 KiB] *.C file
	fig2d.pdf [21 KiB] HiDef png [309 KiB] Thumbnail [271 KiB] *.C file
Animated gif made out of all figures.	PAPER-2015-024.gif Thumbnail

Tables and captions

Summary of the signal yields and efficiencies for the $ B _ c ^+ \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} \pi ^+ $ decay.	Table_1.pdf [42 KiB] HiDef png [40 KiB] Thumbnail [19 KiB] tex code
Summary of the signal yields and efficiencies for the $ B _ c ^+ \rightarrow \psi {(2S)} \pi ^+ $ decay.	Table_2.pdf [42 KiB] HiDef png [38 KiB] Thumbnail [19 KiB] tex code
Summary of systematic uncertainties on the $ R_{\cal B } $ measurement.	Table_3.pdf [39 KiB] HiDef png [111 KiB] Thumbnail [47 KiB] tex code

Supplementary Material [file]

Supplementary material full pdf	supple[..].pdf [181 KiB]
This ZIP file contains supplementary material for the publication LHCb-PAPER-2015-024. The files are: Supplementary.pdf : An overview of the extra figures .pdf, .png, .eps, .C : The figures in various formats	fig3a.pdf [22 KiB] HiDef png [310 KiB] Thumbnail [255 KiB] *C file
	fig3b.pdf [22 KiB] HiDef png [303 KiB] Thumbnail [246 KiB] *C file
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