Differential branching fractions and isospin asymmetries of $B \to K^{(*)} \mu^+ \mu^-$ decays

Information

LHCb-PAPER-2014-006
CERN-PH-EP-2014-055
arXiv:1403.8044 [PDF]

(Submitted on 31 Mar 2014)
JHEP 06 (2014) 133
Inspire 1287928

Tools

Abstract

The isospin asymmetries of $B \to K\mu^+\mu^-$ and $B \to K^{*}\mu^+\mu^-$ decays and the partial branching fractions of the $B^0 \to K^0\mu^+\mu^-$, $B^+ \to K^+\mu^+\mu^-$ and $B^+ \to K^{*+}\mu^+\mu^-$ decays are measured as functions of the dimuon mass squared, $q^2$. The data used correspond to an integrated luminosity of 3$ $fb$^{-1}$ from proton-proton collisions collected with the LHCb detector at centre-of-mass energies of 7$ $TeV and 8$ $TeV in 2011 and 2012, respectively. The isospin asymmetries are both consistent with the Standard Model expectations. The three measured branching fractions, while individually consistent, all favour lower values than their respective Standard Model predictions.

Figures and captions

Reconstructed $ B $ candidate mass for the four signal modes. The data are overlaid with the result of the fit described in the text. The long and downstream $ K ^0_{\rm\scriptscriptstyle S}$ categories are combined. The results of the fits, performed in separate $ q^{2}$ bins, are merged for presentation purposes. The blue (shaded) region is the combinatorial background.	mass_K[..].pdf [20 KiB] HiDef png [207 KiB] Thumbnail [181 KiB] *.C file
	mass_Kmumu.pdf [20 KiB] HiDef png [154 KiB] Thumbnail [135 KiB] *.C file
	mass_K[..].pdf [20 KiB] HiDef png [161 KiB] Thumbnail [141 KiB] *.C file
	mass_K[..].pdf [20 KiB] HiDef png [196 KiB] Thumbnail [175 KiB] *.C file
Differential branching fraction results for the $ B ^+ \rightarrow K ^+ \mu ^+ \mu ^- $ , $ B ^0 \rightarrow K ^0 \mu ^+ \mu ^- $ and $ B ^+ \rightarrow K^{*+} \mu ^+ \mu ^- $ decays. The uncertainties shown on the data points are the quadratic sum of the statistical and systematic uncertainties. The shaded regions illustrate the theoretical predictions and their uncertainties from light cone sum rule and lattice QCD calculations.	kmumu_BF.pdf [24 KiB] HiDef png [182 KiB] Thumbnail [163 KiB] *.C file
	ksmumu_BF.pdf [23 KiB] HiDef png [177 KiB] Thumbnail [157 KiB] *.C file
	bukst_BF.pdf [19 KiB] HiDef png [172 KiB] Thumbnail [151 KiB] *.C file
Isospin asymmetries for (left) $ B \rightarrow K \mu ^+ \mu ^- $ and (right) $ B \rightarrow K^{*} \mu ^+ \mu ^- $ decays.	kmumu_AI.pdf [14 KiB] HiDef png [67 KiB] Thumbnail [40 KiB] *.C file
	kstmumu_AI.pdf [14 KiB] HiDef png [68 KiB] Thumbnail [40 KiB] *.C file
Isospin asymmetry of $ B \rightarrow K \mu ^+ \mu ^- $ obtained separately from the 2011 and 2012 data sets.	kmumu_[..].pdf [15 KiB] HiDef png [120 KiB] Thumbnail [114 KiB] *.C file
Animated gif made out of all figures.	PAPER-2014-006.gif Thumbnail

Tables and captions

Observed yields of the four signal channels summed over the $ q^{2}$ bins, excluding the charmonium resonance regions. Only the statistical uncertainties are shown.	Table_1.pdf [51 KiB] HiDef png [62 KiB] Thumbnail [30 KiB] tex code
Summary of systematic uncertainties associated with the branching fraction and isospin asymmetry measurements.	Table_2.pdf [45 KiB] HiDef png [35 KiB] Thumbnail [15 KiB] tex code
Integrated branching fractions $(10^{-8})$ in the high $ q^{2}$ region. For the $ B \rightarrow K \mu ^+ \mu ^- $ modes the region is defined as $15-22 {\mathrm{ Ge V^2 /}c^4} $, while for $ B ^+ \rightarrow K^{*+} \mu ^+ \mu ^- $ it is $15-19 {\mathrm{ Ge V^2 /}c^4} $. Predictions are obtained using the form factors calculated in lattice QCD over the same $ q^{2}$ regions. For the measurements, the first uncertainty is statistical and the second systematic.	Table_3.pdf [52 KiB] HiDef png [51 KiB] Thumbnail [26 KiB] tex code
Differential branching fraction results ($10^{-9} \times c^4/ GeV^2$) for the $ B ^+ \rightarrow K ^+ \mu ^+ \mu ^- $ decay, including statistical and systematic uncertainties.	Table_4.pdf [30 KiB] HiDef png [192 KiB] Thumbnail [92 KiB] tex code
Differential branching fraction results ($10^{-9} \times c^4/ GeV^2$) for the $ B ^0 \rightarrow K ^0 \mu ^+ \mu ^- $ decay, including statistical and systematic uncertainties.	Table_5.pdf [45 KiB] HiDef png [109 KiB] Thumbnail [54 KiB] tex code
Differential branching fraction results ($10^{-9} \times c^4/ GeV^2$) for the $ B ^+ \rightarrow K^{*+} \mu ^+ \mu ^- $ decay, including statistical and systematic uncertainties.	Table_6.pdf [45 KiB] HiDef png [107 KiB] Thumbnail [53 KiB] tex code
Isospin asymmetry results for the $ B \rightarrow K \mu ^+ \mu ^- $ decay, including statistical and systematic uncertainties.	Table_7.pdf [45 KiB] HiDef png [116 KiB] Thumbnail [58 KiB] tex code
Isospin asymmetry results for the $ B \rightarrow K^{*} \mu ^+ \mu ^- $ decay, including statistical and systematic uncertainties.	Table_8.pdf [45 KiB] HiDef png [116 KiB] Thumbnail [58 KiB] tex code

Supplementary Material [file]

Supplementary material full pdf	supple[..].pdf [345 KiB]
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