Observation of B decays to two kaons

S. W. Lin, P. Chang, K. Abe, K. Abe, I. Adachi, H. Aihara, D. Anipko, K. Arinstein, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, E. Barberio, A. Bay, I. Bedny, K. Belous, U. Bitenc, I. Bizjak, S. Blyth, A. BondarA. Bozek, M. Bračko, Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, J. Dalseno, M. Dash, J. Dragic, S. Eidelman, S. Fratina, N. Gabyshev, T. Gershon, A. Go, G. Gokhroo, B. Golob, H. Ha, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, Y. Hoshi, S. Hou, W. S. Hou, Y. B. Hsiung, T. Iijima, K. Ikado, A. Imoto, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, H. Kaji, J. H. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. R. Khan, H. Kichimi, Y. J. Kim, K. Kinoshita, S. Korpar, P. Križan, R. Kulasiri, C. C. Kuo, Y. J. Kwon, J. S. Lange, J. Lee, M. J. Lee, S. E. Lee, T. Lesiak, A. Limosani, F. Mandl, T. Matsumoto, S. McOnie, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, D. Mohapatra, T. Mori, I. Nakamura, E. Nakano, M. Nakao, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, K. S. Park, R. Pestotnik, L. E. Piilonen, H. Sahoo, Y. Sakai, N. Satoyama, T. Schietinger, O. Schneider, J. Schümann, A. J. Schwartz, K. Senyo, M. Shapkin, J. B. Singh, A. Sokolov, A. Somov, N. Soni, S. Stanič, M. Starič, H. Stoeck, T. Sumiyoshi, O. Tajima, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, G. N. Taylor, Y. Teramoto, X. C. Tian, I. Tikhomirov, K. Trabelsi, T. Tsukamoto, S. Uehara, T. Uglov, K. Ueno, Y. Unno, S. Uno, Y. Usov, G. Varner, S. Villa, C. C. Wang, C. H. Wang, M. Z. Wang, Y. Watanabe, Eunil Won, Q. L. Xie, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, C. C. Zhang, L. M. Zhang, Z. P. Zhang, V. Zhilich, A. Zupanc

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Using 449×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we observe clear signals for B+→K̄0K+ and B0→K̄0K0 decays with 5.3σ and 6.0σ significance, respectively. We measure the branching fractions B(B+→K̄0K+)=(1.22-0.28-0.16+0.32+0.13)×10-6 and B(B0→K̄0K0)=(0.87-0.20+0.25±0.09)×10-6, and partial-rate asymmetries ACP(B+→K̄0K+)=0.13-0.24+0.23±0.02 and ACP(B0→K̄0K0)=-0.58-0.66+0.73±0.04. From a simultaneous fit, we also obtain B(B+→K0π+)=(22.8-0.7+0.8±1.3)×10-6 and ACP(B+→K0π+)=0.03±0.03±0.01. The first and second error in the branching fractions and the partial-rate asymmetries are statistical and systematic, respectively. No signal is observed for B0→K+K- decays, and for this branching fraction, we set an upper limit of 4.1×10-7 at the 90% confidence level.

Original languageEnglish
Article number181804
JournalPhysical Review Letters
Volume98
Issue number18
DOIs
Publication statusPublished - 2007 May 4

Fingerprint

kaons
decay
asymmetry
confidence
detectors
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Lin, S. W., Chang, P., Abe, K., Abe, K., Adachi, I., Aihara, H., ... Zupanc, A. (2007). Observation of B decays to two kaons. Physical Review Letters, 98(18), [181804]. https://doi.org/10.1103/PhysRevLett.98.181804

Observation of B decays to two kaons. / Lin, S. W.; Chang, P.; Abe, K.; Abe, K.; Adachi, I.; Aihara, H.; Anipko, D.; Arinstein, K.; Aulchenko, V.; Aushev, T.; Aziz, T.; Bakich, A. M.; Barberio, E.; Bay, A.; Bedny, I.; Belous, K.; Bitenc, U.; Bizjak, I.; Blyth, S.; Bondar, A.; Bozek, A.; Bračko, M.; Chao, Y.; Chen, A.; Chen, K. F.; Chen, W. T.; Cheon, B. G.; Chistov, R.; Choi, S. K.; Choi, Y.; Choi, Y. K.; Dalseno, J.; Dash, M.; Dragic, J.; Eidelman, S.; Fratina, S.; Gabyshev, N.; Gershon, T.; Go, A.; Gokhroo, G.; Golob, B.; Ha, H.; Haba, J.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Heffernan, D.; Hoshi, Y.; Hou, S.; Hou, W. S.; Hsiung, Y. B.; Iijima, T.; Ikado, K.; Imoto, A.; Inami, K.; Ishikawa, A.; Ishino, H.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kaji, H.; Kang, J. H.; Katayama, N.; Kawai, H.; Kawasaki, T.; Khan, H. R.; Kichimi, H.; Kim, Y. J.; Kinoshita, K.; Korpar, S.; Križan, P.; Kulasiri, R.; Kuo, C. C.; Kwon, Y. J.; Lange, J. S.; Lee, J.; Lee, M. J.; Lee, S. E.; Lesiak, T.; Limosani, A.; Mandl, F.; Matsumoto, T.; McOnie, S.; Mitaroff, W.; Miyabayashi, K.; Miyake, H.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Mohapatra, D.; Mori, T.; Nakamura, I.; Nakano, E.; Nakao, M.; Nishida, S.; Nitoh, O.; Noguchi, S.; Nozaki, T.; Ogawa, S.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Onuki, Y.; Ozaki, H.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H.; Park, K. S.; Pestotnik, R.; Piilonen, L. E.; Sahoo, H.; Sakai, Y.; Satoyama, N.; Schietinger, T.; Schneider, O.; Schümann, J.; Schwartz, A. J.; Senyo, K.; Shapkin, M.; Singh, J. B.; Sokolov, A.; Somov, A.; Soni, N.; Stanič, S.; Starič, M.; Stoeck, H.; Sumiyoshi, T.; Tajima, O.; Takasaki, F.; Tamai, K.; Tamura, N.; Tanaka, M.; Taylor, G. N.; Teramoto, Y.; Tian, X. C.; Tikhomirov, I.; Trabelsi, K.; Tsukamoto, T.; Uehara, S.; Uglov, T.; Ueno, K.; Unno, Y.; Uno, S.; Usov, Y.; Varner, G.; Villa, S.; Wang, C. C.; Wang, C. H.; Wang, M. Z.; Watanabe, Y.; Won, Eunil; Xie, Q. L.; Yabsley, B. D.; Yamaguchi, A.; Yamashita, Y.; Yamauchi, M.; Zhang, C. C.; Zhang, L. M.; Zhang, Z. P.; Zhilich, V.; Zupanc, A.

In: Physical Review Letters, Vol. 98, No. 18, 181804, 04.05.2007.

Research output: Contribution to journalArticle

Lin, SW, Chang, P, Abe, K, Abe, K, Adachi, I, Aihara, H, Anipko, D, Arinstein, K, Aulchenko, V, Aushev, T, Aziz, T, Bakich, AM, Barberio, E, Bay, A, Bedny, I, Belous, K, Bitenc, U, Bizjak, I, Blyth, S, Bondar, A, Bozek, A, Bračko, M, Chao, Y, Chen, A, Chen, KF, Chen, WT, Cheon, BG, Chistov, R, Choi, SK, Choi, Y, Choi, YK, Dalseno, J, Dash, M, Dragic, J, Eidelman, S, Fratina, S, Gabyshev, N, Gershon, T, Go, A, Gokhroo, G, Golob, B, Ha, H, Haba, J, Hara, T, Hayasaka, K, Hayashii, H, Hazumi, M, Heffernan, D, Hoshi, Y, Hou, S, Hou, WS, Hsiung, YB, Iijima, T, Ikado, K, Imoto, A, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwasaki, M, Iwasaki, Y, Kaji, H, Kang, JH, Katayama, N, Kawai, H, Kawasaki, T, Khan, HR, Kichimi, H, Kim, YJ, Kinoshita, K, Korpar, S, Križan, P, Kulasiri, R, Kuo, CC, Kwon, YJ, Lange, JS, Lee, J, Lee, MJ, Lee, SE, Lesiak, T, Limosani, A, Mandl, F, Matsumoto, T, McOnie, S, Mitaroff, W, Miyabayashi, K, Miyake, H, Miyata, H, Miyazaki, Y, Mizuk, R, Mohapatra, D, Mori, T, Nakamura, I, Nakano, E, Nakao, M, Nishida, S, Nitoh, O, Noguchi, S, Nozaki, T, Ogawa, S, Ohshima, T, Okuno, S, Olsen, SL, Onuki, Y, Ozaki, H, Pakhlov, P, Pakhlova, G, Park, CW, Park, H, Park, KS, Pestotnik, R, Piilonen, LE, Sahoo, H, Sakai, Y, Satoyama, N, Schietinger, T, Schneider, O, Schümann, J, Schwartz, AJ, Senyo, K, Shapkin, M, Singh, JB, Sokolov, A, Somov, A, Soni, N, Stanič, S, Starič, M, Stoeck, H, Sumiyoshi, T, Tajima, O, Takasaki, F, Tamai, K, Tamura, N, Tanaka, M, Taylor, GN, Teramoto, Y, Tian, XC, Tikhomirov, I, Trabelsi, K, Tsukamoto, T, Uehara, S, Uglov, T, Ueno, K, Unno, Y, Uno, S, Usov, Y, Varner, G, Villa, S, Wang, CC, Wang, CH, Wang, MZ, Watanabe, Y, Won, E, Xie, QL, Yabsley, BD, Yamaguchi, A, Yamashita, Y, Yamauchi, M, Zhang, CC, Zhang, LM, Zhang, ZP, Zhilich, V & Zupanc, A 2007, 'Observation of B decays to two kaons', Physical Review Letters, vol. 98, no. 18, 181804. https://doi.org/10.1103/PhysRevLett.98.181804
Lin SW, Chang P, Abe K, Abe K, Adachi I, Aihara H et al. Observation of B decays to two kaons. Physical Review Letters. 2007 May 4;98(18). 181804. https://doi.org/10.1103/PhysRevLett.98.181804
Lin, S. W. ; Chang, P. ; Abe, K. ; Abe, K. ; Adachi, I. ; Aihara, H. ; Anipko, D. ; Arinstein, K. ; Aulchenko, V. ; Aushev, T. ; Aziz, T. ; Bakich, A. M. ; Barberio, E. ; Bay, A. ; Bedny, I. ; Belous, K. ; Bitenc, U. ; Bizjak, I. ; Blyth, S. ; Bondar, A. ; Bozek, A. ; Bračko, M. ; Chao, Y. ; Chen, A. ; Chen, K. F. ; Chen, W. T. ; Cheon, B. G. ; Chistov, R. ; Choi, S. K. ; Choi, Y. ; Choi, Y. K. ; Dalseno, J. ; Dash, M. ; Dragic, J. ; Eidelman, S. ; Fratina, S. ; Gabyshev, N. ; Gershon, T. ; Go, A. ; Gokhroo, G. ; Golob, B. ; Ha, H. ; Haba, J. ; Hara, T. ; Hayasaka, K. ; Hayashii, H. ; Hazumi, M. ; Heffernan, D. ; Hoshi, Y. ; Hou, S. ; Hou, W. S. ; Hsiung, Y. B. ; Iijima, T. ; Ikado, K. ; Imoto, A. ; Inami, K. ; Ishikawa, A. ; Ishino, H. ; Itoh, R. ; Iwasaki, M. ; Iwasaki, Y. ; Kaji, H. ; Kang, J. H. ; Katayama, N. ; Kawai, H. ; Kawasaki, T. ; Khan, H. R. ; Kichimi, H. ; Kim, Y. J. ; Kinoshita, K. ; Korpar, S. ; Križan, P. ; Kulasiri, R. ; Kuo, C. C. ; Kwon, Y. J. ; Lange, J. S. ; Lee, J. ; Lee, M. J. ; Lee, S. E. ; Lesiak, T. ; Limosani, A. ; Mandl, F. ; Matsumoto, T. ; McOnie, S. ; Mitaroff, W. ; Miyabayashi, K. ; Miyake, H. ; Miyata, H. ; Miyazaki, Y. ; Mizuk, R. ; Mohapatra, D. ; Mori, T. ; Nakamura, I. ; Nakano, E. ; Nakao, M. ; Nishida, S. ; Nitoh, O. ; Noguchi, S. ; Nozaki, T. ; Ogawa, S. ; Ohshima, T. ; Okuno, S. ; Olsen, S. L. ; Onuki, Y. ; Ozaki, H. ; Pakhlov, P. ; Pakhlova, G. ; Park, C. W. ; Park, H. ; Park, K. S. ; Pestotnik, R. ; Piilonen, L. E. ; Sahoo, H. ; Sakai, Y. ; Satoyama, N. ; Schietinger, T. ; Schneider, O. ; Schümann, J. ; Schwartz, A. J. ; Senyo, K. ; Shapkin, M. ; Singh, J. B. ; Sokolov, A. ; Somov, A. ; Soni, N. ; Stanič, S. ; Starič, M. ; Stoeck, H. ; Sumiyoshi, T. ; Tajima, O. ; Takasaki, F. ; Tamai, K. ; Tamura, N. ; Tanaka, M. ; Taylor, G. N. ; Teramoto, Y. ; Tian, X. C. ; Tikhomirov, I. ; Trabelsi, K. ; Tsukamoto, T. ; Uehara, S. ; Uglov, T. ; Ueno, K. ; Unno, Y. ; Uno, S. ; Usov, Y. ; Varner, G. ; Villa, S. ; Wang, C. C. ; Wang, C. H. ; Wang, M. Z. ; Watanabe, Y. ; Won, Eunil ; Xie, Q. L. ; Yabsley, B. D. ; Yamaguchi, A. ; Yamashita, Y. ; Yamauchi, M. ; Zhang, C. C. ; Zhang, L. M. ; Zhang, Z. P. ; Zhilich, V. ; Zupanc, A. / Observation of B decays to two kaons. In: Physical Review Letters. 2007 ; Vol. 98, No. 18.
@article{cfdd8ddc425349b091e598b6be19725c,
title = "Observation of B decays to two kaons",
abstract = "Using 449×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we observe clear signals for B+→K̄0K+ and B0→K̄0K0 decays with 5.3σ and 6.0σ significance, respectively. We measure the branching fractions B(B+→K̄0K+)=(1.22-0.28-0.16+0.32+0.13)×10-6 and B(B0→K̄0K0)=(0.87-0.20+0.25±0.09)×10-6, and partial-rate asymmetries ACP(B+→K̄0K+)=0.13-0.24+0.23±0.02 and ACP(B0→K̄0K0)=-0.58-0.66+0.73±0.04. From a simultaneous fit, we also obtain B(B+→K0π+)=(22.8-0.7+0.8±1.3)×10-6 and ACP(B+→K0π+)=0.03±0.03±0.01. The first and second error in the branching fractions and the partial-rate asymmetries are statistical and systematic, respectively. No signal is observed for B0→K+K- decays, and for this branching fraction, we set an upper limit of 4.1×10-7 at the 90{\%} confidence level.",
author = "Lin, {S. W.} and P. Chang and K. Abe and K. Abe and I. Adachi and H. Aihara and D. Anipko and K. Arinstein and V. Aulchenko and T. Aushev and T. Aziz and Bakich, {A. M.} and E. Barberio and A. Bay and I. Bedny and K. Belous and U. Bitenc and I. Bizjak and S. Blyth and A. Bondar and A. Bozek and M. Bračko and Y. Chao and A. Chen and Chen, {K. F.} and Chen, {W. T.} and Cheon, {B. G.} and R. Chistov and Choi, {S. K.} and Y. Choi and Choi, {Y. K.} and J. Dalseno and M. Dash and J. Dragic and S. Eidelman and S. Fratina and N. Gabyshev and T. Gershon and A. Go and G. Gokhroo and B. Golob and H. Ha and J. Haba and T. Hara and K. Hayasaka and H. Hayashii and M. Hazumi and D. Heffernan and Y. Hoshi and S. Hou and Hou, {W. S.} and Hsiung, {Y. B.} and T. Iijima and K. Ikado and A. Imoto and K. Inami and A. Ishikawa and H. Ishino and R. Itoh and M. Iwasaki and Y. Iwasaki and H. Kaji and Kang, {J. H.} and N. Katayama and H. Kawai and T. Kawasaki and Khan, {H. R.} and H. Kichimi and Kim, {Y. J.} and K. Kinoshita and S. Korpar and P. Križan and R. Kulasiri and Kuo, {C. C.} and Kwon, {Y. J.} and Lange, {J. S.} and J. Lee and Lee, {M. J.} and Lee, {S. E.} and T. Lesiak and A. Limosani and F. Mandl and T. Matsumoto and S. McOnie and W. Mitaroff and K. Miyabayashi and H. Miyake and H. Miyata and Y. Miyazaki and R. Mizuk and D. Mohapatra and T. Mori and I. Nakamura and E. Nakano and M. Nakao and S. Nishida and O. Nitoh and S. Noguchi and T. Nozaki and S. Ogawa and T. Ohshima and S. Okuno and Olsen, {S. L.} and Y. Onuki and H. Ozaki and P. Pakhlov and G. Pakhlova and Park, {C. W.} and H. Park and Park, {K. S.} and R. Pestotnik and Piilonen, {L. E.} and H. Sahoo and Y. Sakai and N. Satoyama and T. Schietinger and O. Schneider and J. Sch{\"u}mann and Schwartz, {A. J.} and K. Senyo and M. Shapkin and Singh, {J. B.} and A. Sokolov and A. Somov and N. Soni and S. Stanič and M. Starič and H. Stoeck and T. Sumiyoshi and O. Tajima and F. Takasaki and K. Tamai and N. Tamura and M. Tanaka and Taylor, {G. N.} and Y. Teramoto and Tian, {X. C.} and I. Tikhomirov and K. Trabelsi and T. Tsukamoto and S. Uehara and T. Uglov and K. Ueno and Y. Unno and S. Uno and Y. Usov and G. Varner and S. Villa and Wang, {C. C.} and Wang, {C. H.} and Wang, {M. Z.} and Y. Watanabe and Eunil Won and Xie, {Q. L.} and Yabsley, {B. D.} and A. Yamaguchi and Y. Yamashita and M. Yamauchi and Zhang, {C. C.} and Zhang, {L. M.} and Zhang, {Z. P.} and V. Zhilich and A. Zupanc",
year = "2007",
month = "5",
day = "4",
doi = "10.1103/PhysRevLett.98.181804",
language = "English",
volume = "98",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "18",

}

TY - JOUR

T1 - Observation of B decays to two kaons

AU - Lin, S. W.

AU - Chang, P.

AU - Abe, K.

AU - Abe, K.

AU - Adachi, I.

AU - Aihara, H.

AU - Anipko, D.

AU - Arinstein, K.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Aziz, T.

AU - Bakich, A. M.

AU - Barberio, E.

AU - Bay, A.

AU - Bedny, I.

AU - Belous, K.

AU - Bitenc, U.

AU - Bizjak, I.

AU - Blyth, S.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Chao, Y.

AU - Chen, A.

AU - Chen, K. F.

AU - Chen, W. T.

AU - Cheon, B. G.

AU - Chistov, R.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choi, Y. K.

AU - Dalseno, J.

AU - Dash, M.

AU - Dragic, J.

AU - Eidelman, S.

AU - Fratina, S.

AU - Gabyshev, N.

AU - Gershon, T.

AU - Go, A.

AU - Gokhroo, G.

AU - Golob, B.

AU - Ha, H.

AU - Haba, J.

AU - Hara, T.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hazumi, M.

AU - Heffernan, D.

AU - Hoshi, Y.

AU - Hou, S.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Iijima, T.

AU - Ikado, K.

AU - Imoto, A.

AU - Inami, K.

AU - Ishikawa, A.

AU - Ishino, H.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kaji, H.

AU - Kang, J. H.

AU - Katayama, N.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Khan, H. R.

AU - Kichimi, H.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Korpar, S.

AU - Križan, P.

AU - Kulasiri, R.

AU - Kuo, C. C.

AU - Kwon, Y. J.

AU - Lange, J. S.

AU - Lee, J.

AU - Lee, M. J.

AU - Lee, S. E.

AU - Lesiak, T.

AU - Limosani, A.

AU - Mandl, F.

AU - Matsumoto, T.

AU - McOnie, S.

AU - Mitaroff, W.

AU - Miyabayashi, K.

AU - Miyake, H.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Mohapatra, D.

AU - Mori, T.

AU - Nakamura, I.

AU - Nakano, E.

AU - Nakao, M.

AU - Nishida, S.

AU - Nitoh, O.

AU - Noguchi, S.

AU - Nozaki, T.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Ozaki, H.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, C. W.

AU - Park, H.

AU - Park, K. S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Satoyama, N.

AU - Schietinger, T.

AU - Schneider, O.

AU - Schümann, J.

AU - Schwartz, A. J.

AU - Senyo, K.

AU - Shapkin, M.

AU - Singh, J. B.

AU - Sokolov, A.

AU - Somov, A.

AU - Soni, N.

AU - Stanič, S.

AU - Starič, M.

AU - Stoeck, H.

AU - Sumiyoshi, T.

AU - Tajima, O.

AU - Takasaki, F.

AU - Tamai, K.

AU - Tamura, N.

AU - Tanaka, M.

AU - Taylor, G. N.

AU - Teramoto, Y.

AU - Tian, X. C.

AU - Tikhomirov, I.

AU - Trabelsi, K.

AU - Tsukamoto, T.

AU - Uehara, S.

AU - Uglov, T.

AU - Ueno, K.

AU - Unno, Y.

AU - Uno, S.

AU - Usov, Y.

AU - Varner, G.

AU - Villa, S.

AU - Wang, C. C.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Watanabe, Y.

AU - Won, Eunil

AU - Xie, Q. L.

AU - Yabsley, B. D.

AU - Yamaguchi, A.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Zhang, C. C.

AU - Zhang, L. M.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zupanc, A.

PY - 2007/5/4

Y1 - 2007/5/4

N2 - Using 449×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we observe clear signals for B+→K̄0K+ and B0→K̄0K0 decays with 5.3σ and 6.0σ significance, respectively. We measure the branching fractions B(B+→K̄0K+)=(1.22-0.28-0.16+0.32+0.13)×10-6 and B(B0→K̄0K0)=(0.87-0.20+0.25±0.09)×10-6, and partial-rate asymmetries ACP(B+→K̄0K+)=0.13-0.24+0.23±0.02 and ACP(B0→K̄0K0)=-0.58-0.66+0.73±0.04. From a simultaneous fit, we also obtain B(B+→K0π+)=(22.8-0.7+0.8±1.3)×10-6 and ACP(B+→K0π+)=0.03±0.03±0.01. The first and second error in the branching fractions and the partial-rate asymmetries are statistical and systematic, respectively. No signal is observed for B0→K+K- decays, and for this branching fraction, we set an upper limit of 4.1×10-7 at the 90% confidence level.

AB - Using 449×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we observe clear signals for B+→K̄0K+ and B0→K̄0K0 decays with 5.3σ and 6.0σ significance, respectively. We measure the branching fractions B(B+→K̄0K+)=(1.22-0.28-0.16+0.32+0.13)×10-6 and B(B0→K̄0K0)=(0.87-0.20+0.25±0.09)×10-6, and partial-rate asymmetries ACP(B+→K̄0K+)=0.13-0.24+0.23±0.02 and ACP(B0→K̄0K0)=-0.58-0.66+0.73±0.04. From a simultaneous fit, we also obtain B(B+→K0π+)=(22.8-0.7+0.8±1.3)×10-6 and ACP(B+→K0π+)=0.03±0.03±0.01. The first and second error in the branching fractions and the partial-rate asymmetries are statistical and systematic, respectively. No signal is observed for B0→K+K- decays, and for this branching fraction, we set an upper limit of 4.1×10-7 at the 90% confidence level.

UR - http://www.scopus.com/inward/record.url?scp=34247891546&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34247891546&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.98.181804

DO - 10.1103/PhysRevLett.98.181804

M3 - Article

AN - SCOPUS:34247891546

VL - 98

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 18

M1 - 181804

ER -