Observation of $B \to \eta^\prime K^ * $ and evidence for $B^ + \to \eta^\prime \rho^ + $

The BaBar Collaboration

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    We present an observation of B→η′K∗B→η′K∗. The data sample corresponds to 232 million BB¯BB¯ pairs collected with the BABAR detector at the PEP-II asymmetric-energy BB Factory at SLAC. We measure the branching fractions (in units of 10−610−6) B(B0→η′K∗0)=3.8±1.1±0.5B(B0→η′K∗0)=3.8±1.1±0.5 and B(B+→η′K∗+)=4.9+1.9−1.7±0.8B(B+→η′K∗+)=4.9−1.7+1.9±0.8, where the first error is statistical and the second systematic. A simultaneous fit results in the observation of B→η′K∗B→η′K∗ with B(B→η′K∗)=4.1+1.0−0.9±0.5B(B→η′K∗)=4.1−0.9+1.0±0.5. We also search for B→η′ρB→η′ρ and B→η′f0(980)(f0→π+π−)B→η′f0(980)(f0→π+π−) with results and 90% confidence level upper limits B(B+→η′ρ+)=8.7+3.1−2.8+2.3−1.3B(B+→η′ρ+)=8.7−2.8+3.1−1.3+2.3 (<14<14), B(B0→η′ρ0)<3.7B(B0→η′ρ0)<3.7 and B(B0→η′f0(980)(f0→π+π−))<1.5B(B0→η′f0(980)(f0→π+π−))<1.5. Charge asymmetries in the channels with significant yields are consistent with zero.
    Original languageEnglish
    Number of pages51802
    JournalPhys. Rev. Lett.
    Publication statusPublished - 2007


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