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

Belle実験における$$B^{+} to X_{cbar{c}} K^{+}$$および$$B^{+} to bar{D}^{(ast) 0} pi^{+}$$崩壊の分岐比の絶対値測定

加藤 悠二*; 谷田 聖   ; Belle Collaboration*; 他187名*

Kato, Yuji*; Tanida, Kiyoshi; Belle Collaboration*; 187 of others*

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 $$772times10^{6}$$ $$Bbar{B}$$ pairs collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^{+}e^{-}$$ collider. Here, $$X_{cbar{c}}$$ denotes $$eta_{c}$$, $$J/psi$$, $$chi_{c0}$$, $$chi_{c1}$$, $$eta_{c}(2S)$$, $$psi(2S)$$, $$psi(3770)$$, $$X(3872)$$, and $$X(3915)$$. We do not observe significant signals for $$X(3872)$$ nor $$X(3915)$$, 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.

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パーセンタイル:76.65

分野:Astronomy & Astrophysics

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