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Measurement of branching fraction and search for $$CP$$ violation in $$Bto phi phi K$$

$$Bto phi phi K$$崩壊における分岐比の測定と$$CP$$の破れの探索

Mohanty, S.*; 谷田 聖   ; Belle Collaboration*; 他184名*

Mohanty, S.*; Tanida, Kiyoshi; Belle Collaboration*; 184 of others*

We report the measurement of branching fractions and $$CP$$-violation asymmetries in $$Bto phi phi K$$ decays based on a $$711,{rm fb}^{-1}$$ data sample containing $$772times 10^6$$ $$Bbar{B}$$ events. The data were recorded at the $$Upsilon (4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. For $$B^+ to phi phi K^+$$, the branching fraction and $$CP$$-violation asymmetry measured below the $$eta_{c}$$ threshold ($$m_{phiphi} < 2.85,{rm GeV}/c^2$$) are $$[3.43^{,+,0.48}_{,-,0.46}({rm stat})pm 0.22({rm syst})] times10^{-6}$$ and $$-0.02pm0.11({rm stat})pm0.01({rm syst})$$, respectively. Similarly, the branching fraction obtained for $$B^0 tophiphi K^0$$ below the $$eta_{c}$$ threshold is $$[3.02^{,+,0.75}_{,-,0.66} ({rm stat})pm ,0.20({rm syst})]times10^{-6}$$. We also measure the $$CP$$-violation asymmetry for $$B^+ tophiphi K^+$$ within the $$eta_{c}$$ region ($$m_{phiphi}in [2.94,3.02],{rm GeV}/c^2$$) to be $$+0.12pm0.12({rm stat})pm0.01({rm syst})$$.

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