Author :
Release : 2013
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Kind : eBook
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Book Synopsis Search for a New Bottomonium State Decaying to $\Upsilon(1S)\pi^+\pi^-$ in Pp Collisions at $\sqrt{s}$ by :
Download or read book Search for a New Bottomonium State Decaying to $\Upsilon(1S)\pi^+\pi^-$ in Pp Collisions at $\sqrt{s}$ written by . This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: 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.
