CMS reach in Bs to mu+mu- and B0 to mu+mu- branching fractions for the new LHC runs


We estimate the possible reach on the ${\rm B_s^0}\to\mu^+\mu^-$ and ${\rm B}^0\to\mu^+\mu^-$ branching fractions for the runs of the LHC at $\sqrt{s}$ = 14 TeV and for the integrated luminosities of 100, 300, and 3000 fb-1. With the increased data sample sizes it will be possible to reduce both systematic and statistical errors leading to high precision measurements of branching fractions of ${\rm B^0}\to\mu^+\mu^-$ and ${\rm B_s^0}\to\mu^+\mu^-$ decays, which will allow stringent tests of the Standard Model. At 3000 fb-1 it will be possible to measure the ${\rm B^0}\to\mu^+\mu^-$ with more than 5 $\sigma$ significance.

Projected sensitivity

Number of expected events for ${\rm B_s^0}\to\mu^+\mu^-$ and ${\rm B}^0\to\mu^+\mu^-$ at different integrated luminosity values. We also report the expected uncertainty in the branching fraction measurement for the ${\rm B_s^0}\to\mu^+\mu^-$ and ${\rm B}^0\to\mu^+\mu^-$, the range of significance of ${\rm B}^0\to\mu^+\mu^-$ (the range indicates the $\pm1\sigma$ of the distribution of significance), and the relative uncertainty on the ${\rm B}^0$ to ${\rm B_s^0}$ branching fractions.

Figure Caption
Fit results of the invariant mass distribution for 300 fb-1 and 3000 fb-1. The improvement in the mass resolution for the 3000 fb-1 projection is expected from an improved inner tracker system and removing endcap candidates.
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PDFpdf data_weighted_300.pdf r1 manage 22.5 K 2013-09-30 - 18:54 KaiFengChen  
PNGpng data_weighted_300.png r1 manage 49.8 K 2013-09-30 - 21:08 KaiFengChen  
PDFpdf data_weighted_3000.pdf r1 manage 28.5 K 2013-09-30 - 18:54 KaiFengChen  
PNGpng data_weighted_3000.png r1 manage 52.0 K 2013-09-30 - 21:08 KaiFengChen  
PDFpdf table.pdf r3 r2 r1 manage 215.9 K 2013-10-02 - 18:53 KaiFengChen  
PNGpng table.png r3 r2 r1 manage 41.2 K 2013-10-02 - 18:53 KaiFengChen  
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Topic revision: r4 - 2013-10-04 - KaiFengChen
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