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We have searched for B-s(0) --> hh decays, where h stands for a charged or neutral kaon, or a charged pion. These results are based on a 23: 6 fb(-1) data sample collected with the Belle detector on the Y(5S) resonance at the KEKB asymmetric-energy e(+)e(-) collider, containing 1.25 x 10(6) B-s(()())(B) over bar (()(s)()) events. We observe the decay B-s(0) --> K+K- and measure its branching fraction, B(B-s(0) --> K+K-) = [3.8(-0.9)(+1.0)(stat) +/- 0.5(syst) +/- 0.5(f(s))] x 10(-5). The first error is statistical, the second is systematic, and the third error is due to the uncertainty in the B-s(0) production fraction in e(+)e(-) --> b (b) over bar events. No significant signals are seen in other decay modes, and we set upper limits at the 90% confidence level: B(B-s(0) --> K- pi+) < 1.2 x 10(-5), B(B-s(0) --> pi(+)pi(-)) < 2.6 x 10(-5), and B(B-s(0) --> K-0(K) over bar (0)) < 6.6 x 10(-5).
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Tagir Aushev, Donghyun Kim, Ji Hyun Kim, Jing Li, Olivier Schneider, Mingkui Wang, Xiao Wang
Tagir Aushev, Donghyun Kim, Ji Hyun Kim, Yiming Li, Tara Nanut, Olivier Schneider, Mingkui Wang
Tagir Aushev, Dipanwita Dutta, Sun Hee Kim, Donghyun Kim, Ji Hyun Kim, Yiming Li, Tara Nanut, Olivier Schneider, Mingkui Wang