Evidence for direct CP violation in B ±→ηh ± and observation of B0→ηK0

C. T. Hoi; P. Chang; H. Aihara; D. M. Asner; T. Aushev; A. M. Bakich; K. Belous; V. Bhardwaj; B. Bhuyan; M. Bischofberger; A. Bondar; A. Bozek; M. Bračko; T. E. Browder; M. C. Chang; Y. Chao; A. Chen; K. F. Chen; P. Chen; B. G. Cheon; K. Chilikin; K. Cho; Y. Choi; M. Danilov; Z. Drásal; A. Drutskoy; S. Eidelman; J. E. Fast; V. Gaur; N. Gabyshev; Y. M. Goh; B. Golob; J. Haba; K. Hayasaka; Y. Hoshi; W. S. Hou; Y. B. Hsiung; H. J. Hyun; K. Inami; A. Ishikawa; M. Iwabuchi; Y. Iwasaki; T. Iwashita; J. H. Kang; T. Kawasaki; H. J. Kim; H. O. Kim; J. B. Kim; J. H. Kim; K. T. Kim; M. J. Kim; K. Kinoshita; B. R. Ko; N. Kobayashi; P. Kodyš; S. Korpar; P. Križan; T. Kuhr; T. Kumita; Y. J. Kwon; S. H. Lee; J. Li; J. Libby; Z. Q. Liu; R. Louvot; D. Matvienko; S. McOnie; K. Miyabayashi; H. Miyata; G. B. Mohanty; A. Moll; E. Nakano; M. Nakao; S. Neubauer; S. Nishida; K. Nishimura; O. Nitoh; T. Ohshima; S. Okuno; C. W. Park; H. K. Park; T. K. Pedlar; R. Pestotnik; M. Petrič; L. E. Piilonen; M. Ritter; M. Röhrken; H. Sahoo; Y. Sakai; T. Sanuki; O. Schneider; C. Schwanda; A. J. Schwartz; K. Senyo; M. E. Sevior; M. Shapkin; V. Shebalin; C. P. Shen; T. A. Shibata; J. G. Shiu; F. Simon; P. Smerkol; Y. S. Sohn; A. Sokolov; E. Solovieva; M. Starič; M. Sumihama; S. Tanaka; G. Tatishvili; Y. Teramoto; K. Trabelsi; M. Uchida; T. Uglov; Y. Unno; S. Uno; G. Varner; C. H. Wang; M. Z. Wang; P. Wang; Y. Watanabe; K. M. Williams; E. Won; J. Yamaoka; Y. Yamashita; Y. Yusa; V. Zhilich; A. Zupanc

doi:10.1103/PhysRevLett.108.031801

Evidence for direct CP violation in B ^±→ηh ^± and observation of B0→ηK0

C. T. Hoi, P. Chang, H. Aihara, D. M. Asner, T. Aushev, A. M. Bakich, K. Belous, V. Bhardwaj, B. Bhuyan, M. Bischofberger, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, Y. Chao, A. Chen, K. F. Chen, P. Chen, B. G. CheonK. Chilikin, K. Cho, Y. Choi, M. Danilov, Z. Drásal, A. Drutskoy, S. Eidelman, J. E. Fast, V. Gaur, N. Gabyshev, Y. M. Goh, B. Golob, J. Haba, K. Hayasaka, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, K. Inami, A. Ishikawa, M. Iwabuchi, Y. Iwasaki, T. Iwashita, J. H. Kang, T. Kawasaki, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, P. Kodyš, S. Korpar, P. Križan, T. Kuhr, T. Kumita, Y. J. Kwon, S. H. Lee, J. Li, J. Libby, Z. Q. Liu, R. Louvot, D. Matvienko, S. McOnie, K. Miyabayashi, H. Miyata, G. B. Mohanty, A. Moll, E. Nakano, M. Nakao, S. Neubauer, S. Nishida, K. Nishimura, O. Nitoh, T. Ohshima, S. Okuno, C. W. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Ritter, M. Röhrken, H. Sahoo, Y. Sakai, T. Sanuki, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, M. E. Sevior, M. Shapkin, V. Shebalin, C. P. Shen, T. A. Shibata, J. G. Shiu, F. Simon, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, M. Starič, M. Sumihama, S. Tanaka, G. Tatishvili, Y. Teramoto, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, G. Varner, C. H. Wang, M. Z. Wang, P. Wang, Y. Watanabe, K. M. Williams, E. Won, J. Yamaoka, Y. Yamashita, Y. Yusa, V. Zhilich, A. Zupanc

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Abstract

We report measurements of the branching fractions and CP asymmetries for B ^±→ηh ^± (h=K or π) and the observation of the decay B0→ηK0 from the final data sample of 772×106BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e ⁺e ^- collider. The measured branching fractions are B(B ^±→ηK ^±)=(2. 12±0.23±0.11)×10 ^-6, B(B ^±→ηπ ^±)=(4.07±0. 26±0.21)×10 ^-6, and B(B0→ηK0)=(1.27-0.29+0. 33±0.08)×10 ^-6, where the last decay is observed for the first time with a significance of 5.4 standard deviations (σ). We also find evidence for CP violation in the charged B modes, A _CP(B ^±→ηK ^±)=-0.38±0.11±0. 01 and A _CP(B ^±→ηπ ^±)=- 0.19±0.06±0.01 with significances of 3.8σ and 3.0σ, respectively. For all measurements, the first and second uncertainties are statistical and systematic, respectively.

Original language	English
Article number	031801
Journal	Physical Review Letters
Volume	108
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.108.031801
State	Published - 20 Jan 2012

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10.1103/PhysRevLett.108.031801

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Hoi, C. T., Chang, P., Aihara, H., Asner, D. M., Aushev, T., Bakich, A. M., Belous, K., Bhardwaj, V., Bhuyan, B., Bischofberger, M., Bondar, A., Bozek, A., Bračko, M., Browder, T. E., Chang, M. C., Chao, Y., Chen, A., Chen, K. F., Chen, P., ... Zupanc, A. (2012). Evidence for direct CP violation in B ^±→ηh ^± and observation of B0→ηK0. Physical Review Letters, 108(3), Article 031801. https://doi.org/10.1103/PhysRevLett.108.031801

@article{8fad2da627e34129bf277076c35bc0dd,

title = "Evidence for direct CP violation in B ±→ηh ± and observation of B0→ηK0",

abstract = "We report measurements of the branching fractions and CP asymmetries for B ±→ηh ± (h=K or π) and the observation of the decay B0→ηK0 from the final data sample of 772×106B{\=B} pairs collected with the Belle detector at the KEKB asymmetric-energy e +e - collider. The measured branching fractions are B(B ±→ηK ±)=(2. 12±0.23±0.11)×10 -6, B(B ±→ηπ ±)=(4.07±0. 26±0.21)×10 -6, and B(B0→ηK0)=(1.27-0.29+0. 33±0.08)×10 -6, where the last decay is observed for the first time with a significance of 5.4 standard deviations (σ). We also find evidence for CP violation in the charged B modes, A CP(B ±→ηK ±)=-0.38±0.11±0. 01 and A CP(B ±→ηπ ±)=- 0.19±0.06±0.01 with significances of 3.8σ and 3.0σ, respectively. For all measurements, the first and second uncertainties are statistical and systematic, respectively.",

author = "Hoi, {C. T.} and P. Chang and H. Aihara and Asner, {D. M.} and T. Aushev and Bakich, {A. M.} and K. Belous and V. Bhardwaj and B. Bhuyan and M. Bischofberger and A. Bondar and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and Chang, {M. C.} and Y. Chao and A. Chen and Chen, {K. F.} and P. Chen and Cheon, {B. G.} and K. Chilikin and K. Cho and Y. Choi and M. Danilov and Z. Dr{\'a}sal and A. Drutskoy and S. Eidelman and Fast, {J. E.} and V. Gaur and N. Gabyshev and Goh, {Y. M.} and B. Golob and J. Haba and K. Hayasaka and Y. Hoshi and Hou, {W. S.} and Hsiung, {Y. B.} and Hyun, {H. J.} and K. Inami and A. Ishikawa and M. Iwabuchi and Y. Iwasaki and T. Iwashita and Kang, {J. H.} and T. Kawasaki and Kim, {H. J.} and Kim, {H. O.} and Kim, {J. B.} and Kim, {J. H.} and Kim, {K. T.} and Kim, {M. J.} and K. Kinoshita and Ko, {B. R.} and N. Kobayashi and P. Kody{\v s} and S. Korpar and P. Kri{\v z}an and T. Kuhr and T. Kumita and Kwon, {Y. J.} and Lee, {S. H.} and J. Li and J. Libby and Liu, {Z. Q.} and R. Louvot and D. Matvienko and S. McOnie and K. Miyabayashi and H. Miyata and Mohanty, {G. B.} and A. Moll and E. Nakano and M. Nakao and S. Neubauer and S. Nishida and K. Nishimura and O. Nitoh and T. Ohshima and S. Okuno and Park, {C. W.} and Park, {H. K.} and Pedlar, {T. K.} and R. Pestotnik and M. Petri{\v c} and Piilonen, {L. E.} and M. Ritter and M. R{\"o}hrken and H. Sahoo and Y. Sakai and T. Sanuki and O. Schneider and C. Schwanda and Schwartz, {A. J.} and K. Senyo and Sevior, {M. E.} and M. Shapkin and V. Shebalin and Shen, {C. P.} and Shibata, {T. A.} and Shiu, {J. G.} and F. Simon and P. Smerkol and Sohn, {Y. S.} and A. Sokolov and E. Solovieva and M. Stari{\v c} and M. Sumihama and S. Tanaka and G. Tatishvili and Y. Teramoto and K. Trabelsi and M. Uchida and T. Uglov and Y. Unno and S. Uno and G. Varner and Wang, {C. H.} and Wang, {M. Z.} and P. Wang and Y. Watanabe and Williams, {K. M.} and E. Won and J. Yamaoka and Y. Yamashita and Y. Yusa and V. Zhilich and A. Zupanc",

year = "2012",

month = jan,

day = "20",

doi = "10.1103/PhysRevLett.108.031801",

language = "English",

volume = "108",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "3",

}

Hoi, CT, Chang, P, Aihara, H, Asner, DM, Aushev, T, Bakich, AM, Belous, K, Bhardwaj, V, Bhuyan, B, Bischofberger, M, Bondar, A, Bozek, A, Bračko, M, Browder, TE, Chang, MC, Chao, Y, Chen, A, Chen, KF, Chen, P, Cheon, BG, Chilikin, K, Cho, K, Choi, Y, Danilov, M, Drásal, Z, Drutskoy, A, Eidelman, S, Fast, JE, Gaur, V, Gabyshev, N, Goh, YM, Golob, B, Haba, J, Hayasaka, K, Hoshi, Y, Hou, WS, Hsiung, YB, Hyun, HJ, Inami, K, Ishikawa, A, Iwabuchi, M, Iwasaki, Y, Iwashita, T, Kang, JH, Kawasaki, T, Kim, HJ, Kim, HO, Kim, JB, Kim, JH, Kim, KT, Kim, MJ, Kinoshita, K, Ko, BR, Kobayashi, N, Kodyš, P, Korpar, S, Križan, P, Kuhr, T, Kumita, T, Kwon, YJ, Lee, SH, Li, J, Libby, J, Liu, ZQ, Louvot, R, Matvienko, D, McOnie, S, Miyabayashi, K, Miyata, H, Mohanty, GB, Moll, A, Nakano, E, Nakao, M, Neubauer, S, Nishida, S, Nishimura, K, Nitoh, O, Ohshima, T, Okuno, S, Park, CW, Park, HK, Pedlar, TK, Pestotnik, R, Petrič, M, Piilonen, LE, Ritter, M, Röhrken, M, Sahoo, H, Sakai, Y, Sanuki, T, Schneider, O, Schwanda, C, Schwartz, AJ, Senyo, K, Sevior, ME, Shapkin, M, Shebalin, V, Shen, CP, Shibata, TA, Shiu, JG, Simon, F, Smerkol, P, Sohn, YS, Sokolov, A, Solovieva, E, Starič, M, Sumihama, M, Tanaka, S, Tatishvili, G, Teramoto, Y, Trabelsi, K, Uchida, M, Uglov, T, Unno, Y, Uno, S, Varner, G, Wang, CH, Wang, MZ, Wang, P, Watanabe, Y, Williams, KM, Won, E, Yamaoka, J, Yamashita, Y, Yusa, Y, Zhilich, V & Zupanc, A 2012, 'Evidence for direct CP violation in B ^±→ηh ^± and observation of B0→ηK0', Physical Review Letters, vol. 108, no. 3, 031801. https://doi.org/10.1103/PhysRevLett.108.031801

TY - JOUR

T1 - Evidence for direct CP violation in B ±→ηh ± and observation of B0→ηK0

AU - Hoi, C. T.

AU - Chang, P.

AU - Aihara, H.

AU - Asner, D. M.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Belous, K.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bischofberger, M.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chang, M. C.

AU - Chao, Y.

AU - Chen, A.

AU - Chen, K. F.

AU - Chen, P.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, K.

AU - Choi, Y.

AU - Danilov, M.

AU - Drásal, Z.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Fast, J. E.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Goh, Y. M.

AU - Golob, B.

AU - Haba, J.

AU - Hayasaka, K.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Hyun, H. J.

AU - Inami, K.

AU - Ishikawa, A.

AU - Iwabuchi, M.

AU - Iwasaki, Y.

AU - Iwashita, T.

AU - Kang, J. H.

AU - Kawasaki, T.

AU - Kim, H. J.

AU - Kim, H. O.

AU - Kim, J. B.

AU - Kim, J. H.

AU - Kim, K. T.

AU - Kim, M. J.

AU - Kinoshita, K.

AU - Ko, B. R.

AU - Kobayashi, N.

AU - Kodyš, P.

AU - Korpar, S.

AU - Križan, P.

AU - Kuhr, T.

AU - Kumita, T.

AU - Kwon, Y. J.

AU - Lee, S. H.

AU - Li, J.

AU - Libby, J.

AU - Liu, Z. Q.

AU - Louvot, R.

AU - Matvienko, D.

AU - McOnie, S.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Mohanty, G. B.

AU - Moll, A.

AU - Nakano, E.

AU - Nakao, M.

AU - Neubauer, S.

AU - Nishida, S.

AU - Nishimura, K.

AU - Nitoh, O.

AU - Ohshima, T.

AU - Okuno, S.

AU - Park, C. W.

AU - Park, H. K.

AU - Pedlar, T. K.

AU - Pestotnik, R.

AU - Petrič, M.

AU - Piilonen, L. E.

AU - Ritter, M.

AU - Röhrken, M.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Sanuki, T.

AU - Schneider, O.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shebalin, V.

AU - Shen, C. P.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Simon, F.

AU - Smerkol, P.

AU - Sohn, Y. S.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Starič, M.

AU - Sumihama, M.

AU - Tanaka, S.

AU - Tatishvili, G.

AU - Teramoto, Y.

AU - Trabelsi, K.

AU - Uchida, M.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Varner, G.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Wang, P.

AU - Watanabe, Y.

AU - Williams, K. M.

AU - Won, E.

AU - Yamaoka, J.

AU - Yamashita, Y.

AU - Yusa, Y.

AU - Zhilich, V.

AU - Zupanc, A.

PY - 2012/1/20

Y1 - 2012/1/20

N2 - We report measurements of the branching fractions and CP asymmetries for B ±→ηh ± (h=K or π) and the observation of the decay B0→ηK0 from the final data sample of 772×106BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e +e - collider. The measured branching fractions are B(B ±→ηK ±)=(2. 12±0.23±0.11)×10 -6, B(B ±→ηπ ±)=(4.07±0. 26±0.21)×10 -6, and B(B0→ηK0)=(1.27-0.29+0. 33±0.08)×10 -6, where the last decay is observed for the first time with a significance of 5.4 standard deviations (σ). We also find evidence for CP violation in the charged B modes, A CP(B ±→ηK ±)=-0.38±0.11±0. 01 and A CP(B ±→ηπ ±)=- 0.19±0.06±0.01 with significances of 3.8σ and 3.0σ, respectively. For all measurements, the first and second uncertainties are statistical and systematic, respectively.

AB - We report measurements of the branching fractions and CP asymmetries for B ±→ηh ± (h=K or π) and the observation of the decay B0→ηK0 from the final data sample of 772×106BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e +e - collider. The measured branching fractions are B(B ±→ηK ±)=(2. 12±0.23±0.11)×10 -6, B(B ±→ηπ ±)=(4.07±0. 26±0.21)×10 -6, and B(B0→ηK0)=(1.27-0.29+0. 33±0.08)×10 -6, where the last decay is observed for the first time with a significance of 5.4 standard deviations (σ). We also find evidence for CP violation in the charged B modes, A CP(B ±→ηK ±)=-0.38±0.11±0. 01 and A CP(B ±→ηπ ±)=- 0.19±0.06±0.01 with significances of 3.8σ and 3.0σ, respectively. For all measurements, the first and second uncertainties are statistical and systematic, respectively.

UR - http://www.scopus.com/inward/record.url?scp=84862927441&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.108.031801

DO - 10.1103/PhysRevLett.108.031801

M3 - Article

AN - SCOPUS:84862927441

SN - 0031-9007

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

M1 - 031801

ER -

Evidence for direct CP violation in B ^±→ηh ^± and observation of B0→ηK0

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