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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).
Jian Wang, Lesya Shchutska, Olivier Schneider, Yiming Li, Yi Zhang, Aurelio Bay, Guido Haefeli, Christoph Frei, Frédéric Blanc, Tatsuya Nakada, Michel De Cian, François Fleuret, Elena Graverini, Renato Quagliani, Federico Betti, Andrea Merli, Aravindhan Venkateswaran, Vitalii Lisovskyi, Sebastian Schulte, Veronica Sølund Kirsebom, Elisabeth Maria Niel, Alexandre Brea Rodriguez, Ettore Zaffaroni, Mingkui Wang, Zhirui Xu, Chao Wang, Lei Zhang, Ho Ling Li, Mark Tobin, Minh Tâm Tran, Niko Neufeld, Matthew Needham, Maurizio Martinelli, Vladislav Balagura, Donal Patrick Hill, Liang Sun, Xiaoxue Han, Liupan An, Federico Leo Redi, Maxime Schubiger, Hang Yin, Violaine Bellée, Preema Rennee Pais, Pavol Stefko, Tara Nanut, Maria Elena Stramaglia, Yao Zhou, Tommaso Colombo, Vladimir Macko, Guillaume Max Pietrzyk, Evgenii Shmanin, Maxim Karpov, Simone Meloni, Xiaoqing Zhou, Surapat Ek-In, Carina Trippl, Sara Celani, Marco Guarise, Serhii Cholak, Dipanwita Dutta, Zheng Wang, Yong Yang, Yi Wang, Hao Liu, Hans Dijkstra, Gerhard Raven, Peter Clarke, Frédéric Teubert, Giovanni Carboni, Victor Coco, Shuai Liu, Adam Davis, Paolo Durante, Yu Zheng, Renjie Wang, Anton Petrov, Maxim Borisyak, Feng Jiang, Chen Chen, Alexey Boldyrev, Almagul Kondybayeva, Hossein Afsharnia
Olivier Schneider, Yiming Li, Mingkui Wang, Chao Wang, Tagir Aushev, Sun Hee Kim, Donghyun Kim, Xiao Wang, Lei Li
Olivier Schneider, Mingkui Wang, Chao Wang, Tagir Aushev, Sun Hee Kim, Donghyun Kim, Xiao Wang, Lei Li