تقرير
Recent results on $B \to \mu^+ \mu^-$ decays with the CMS experiment
| العنوان: | Recent results on $B \to \mu^+ \mu^-$ decays with the CMS experiment |
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| المؤلفون: | Langenegger, Urs |
| سنة النشر: | 2020 |
| المجموعة: | High Energy Physics - Experiment |
| مصطلحات موضوعية: | High Energy Physics - Experiment |
| الوصف: | Results on $B \to \mu^+ \mu^-$ decays with the CMS experiment are reported, using 61 fb$^{-1}$ of data recorded during LHC Run 1 and 2016. With an improved muon identification algorithm and refined unbinned maximum likelihood fitting methods, the decay $B_s^0 \to \mu^+ \mu^-$ is observed with a significance of 5.6 standard deviations. Its branching fraction is measured to be BF($B^0_s \to \mu^+ \mu^-$) = [2.9+/-0.7(exp)+/-0.2(frag)]$\times 10^{-9}$, where the first error is the combined statistical and systematic uncertainty and the second error quantifies the uncertainty of the $B^0_s$ and $B^+$ fragmentation probability ratio. The $B^0_s \to \mu^+ \mu^-$ effective lifetime is $\tau_{\mu^+ \mu^-} =1.70^{+0.61}_{-0.44}$ps. No evidence for the decay $B^0 \to \mu^+ \mu^-$ is found and an upper limit of BF($B^0 \to \mu^+ \mu^-$) < 3.6$\times 10^{-10}$ (at 95% confidence level) is determined. All results are consistent with the standard model of particle physics. Comment: Invited short review submitted to MPLA |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1142/S0217732320300177 |
| URL الوصول: | http://arxiv.org/abs/2006.14849 |
| رقم الأكسشن: | edsarx.2006.14849 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1142/S0217732320300177 |
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