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論文

Measurements of the absolute branching fractions of $B^{+} to X_{cbar{c}} K^{+}$ and $B^{+} to bar{D}^{(ast) 0} pi^{+}$ at Belle

加藤悠二*; 谷田聖; Belle Collaboration*; 他187名*

Physical Review D, 97(1), p.012005_1 - 012005_10, 2018/01

AA2018-0509.pdf:0.51MB

https://doi.org/10.1103/PhysRevD.97.012005

被引用回数：24 パーセンタイル：75.39(Astronomy & Astrophysics)

We present the measurement of the absolute branching fractions of $B^{+} to X_{cbar{c}} K^{+}$ and $B^{+} to bar{D}^{(ast) 0} pi^{+}$ decays, using a data sample of $772times10^{6}$ pairs collected at the resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. Here, $X_{cbar{c}}$ denotes $eta_{c}$ , , $chi_{c0}$ , $chi_{c1}$ , $eta_{c}(2S)$ , , , , and . We do not observe significant signals for nor , and set the 90 confidence level upper limits: ${cal B}(B^{+} to X(3872) K^{+} ) < 2.7 times 10^{-4}$ and ${cal B}(B^{+} to X(3915) K^{+} ) < 2.9 times 10^{-4}$ . These represent the most stringent upper limit for ${cal B}(B^{+} to X(3872) K^{+} )$ to date and the first measurement for ${cal B}(B^{+} to X(3915) K^{+} )$ . The measured branching fractions for $eta_{c}$ and $eta_{c}(2S)$ are the most precise to date: ${cal B}(B^{+} to eta_{c} K^{+})=(12.3pm0.8pm0.7) times 10^{-4}$ and ${cal B}(B^{+} to eta_{c}(2S)K^{+}) =(4.9pm1.1pm0.3) times 10^{-4}$ , where the first and second uncertainties are statistical and systematic, respectively.