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      Search for the weak decay \(\eta^{\prime}\to K^{\pm}\pi^{\mp}\) and precise measurement of the branching fraction \({\cal B}(J/\psi\to\phi\eta^{\prime})\)

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          Abstract

          We present the first search for the rare decay of \(\eta^\prime\) into \(K^{\pm}\pi^{\mp}\) in \(J/\psi\to\phi\eta^{\prime}\), using a sample of \(1.3\times10^{9}\) \(J/\psi\) events collected with the BESIII detector. No significant signal is observed, and the upper limit at the 90\% confidence level for the ratio \(\frac{{\cal B}(\eta^{\prime}\to K^{\pm}\pi^{\mp})}{{\cal B}(\eta^{\prime}\to\gamma\pi^{+}\pi^{-})}\) is determined to be \(1.3\times10^{-4}\). In addition, we report the measurement of the branching fraction of \(J/\psi\to\phi\eta^{\prime}\) to be \((5.10\pm0.03(\text{stat.})\pm0.32(\text{syst.}))\times10^{-4}\), which agrees with previous results from BESII.

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          Journal
          2016-02-24
          Article
          10.1103/PhysRevD.93.072008
          1602.07405
          22f48271-ca55-4bf8-a466-80be99bbffae

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          Phys. Rev. D 93, 072008 (2016)
          hep-ex

          High energy & Particle physics
          High energy & Particle physics

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