CMS-BPH-11-016

CMS-BPH-11-016 ; CERN-PH-EP-2013-157
Search for a new bottomonium state decaying to $\Upsilon(1S)\pi^+ \pi^-$ in pp collisions at $\sqrt{s}$ = 8 TeV
CMS Collaboration
1 September 2013
Phys. Lett. B 727 (2013) 57
Abstract: The results of a search for the bottomonium counterpart, denoted as $X_b$ , of the exotic charmonium state X(3872) is presented. The analysis is based on a sample of pp collisions at $\sqrt{s}$ = 8 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 20.7 inverse femtobarns. The search looks for the exclusive decay channel $X_b \to \Upsilon(1S) \pi^+ \pi^-$ followed by $\Upsilon(1S) \to \mu^+ \mu^-$ . No evidence for an $X_b$ signal is observed. Upper limits are set at the 95% confidence level on the ratio of the inclusive production cross sections times the branching fractions to $\Upsilon(1S) \pi^+ \pi^-$ of the $X_b$ and the $\Upsilon$ (2S). The upper limits on the ratio are in the range 0.9-5.4% for $X_b$ masses between 10 and 11 GeV. These are the first upper limits on the production of a possible $X_b$ at a hadron collider.
Links: e-print arXiv:1309.0250 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; Public twiki page ; CADI line (restricted) ;

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