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 & 107 others 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, Eunil Won, J. Yamaoka, Y. Yamashita, Y. Yusa, V. Zhilich, A. Zupanc

Research output: Contribution to journalArticle

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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 languageEnglish
Article number031801
JournalPhysical Review Letters
Volume108
Issue number3
DOIs
Publication statusPublished - 2012 Jan 20

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CP violation
decay
standard deviation
asymmetry
detectors
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Hoi, C. T., Chang, P., Aihara, H., Asner, D. M., Aushev, T., Bakich, A. M., ... Zupanc, A. (2012). Evidence for direct CP violation in B ±→ηh ± and observation of B0→ηK0. Physical Review Letters, 108(3), [031801]. https://doi.org/10.1103/PhysRevLett.108.031801

Evidence for direct CP violation in B ±→ηh ± and observation of B0→ηK0. / 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.; Cheon, B. G.; Chilikin, K.; Cho, K.; Choi, Y.; Danilov, M.; Drásal, Z.; Drutskoy, A.; Eidelman, S.; Fast, J. E.; Gaur, V.; Gabyshev, N.; Goh, Y. M.; Golob, B.; Haba, J.; Hayasaka, K.; Hoshi, Y.; Hou, W. S.; Hsiung, Y. B.; Hyun, H. J.; Inami, K.; Ishikawa, A.; Iwabuchi, M.; Iwasaki, Y.; Iwashita, T.; Kang, J. H.; Kawasaki, T.; Kim, H. J.; Kim, H. O.; Kim, J. B.; Kim, J. H.; Kim, K. T.; Kim, M. J.; Kinoshita, K.; Ko, B. R.; Kobayashi, N.; Kodyš, P.; Korpar, S.; Križan, P.; Kuhr, T.; Kumita, T.; Kwon, Y. J.; Lee, S. H.; Li, J.; Libby, J.; Liu, Z. Q.; Louvot, R.; Matvienko, D.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Mohanty, G. B.; Moll, A.; Nakano, E.; Nakao, M.; Neubauer, S.; Nishida, S.; Nishimura, K.; Nitoh, O.; Ohshima, T.; Okuno, S.; Park, C. W.; Park, H. K.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Ritter, M.; Röhrken, M.; Sahoo, H.; Sakai, Y.; Sanuki, T.; Schneider, O.; Schwanda, C.; Schwartz, A. J.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shebalin, V.; Shen, C. P.; Shibata, T. A.; Shiu, J. G.; Simon, F.; Smerkol, P.; Sohn, Y. S.; 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, C. H.; Wang, M. Z.; Wang, P.; Watanabe, Y.; Williams, K. M.; Won, Eunil; Yamaoka, J.; Yamashita, Y.; Yusa, Y.; Zhilich, V.; Zupanc, A.

In: Physical Review Letters, Vol. 108, No. 3, 031801, 20.01.2012.

Research output: Contribution to journalArticle

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
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. ; Cheon, B. G. ; Chilikin, K. ; Cho, K. ; Choi, Y. ; Danilov, M. ; Drásal, Z. ; Drutskoy, A. ; Eidelman, S. ; Fast, J. E. ; Gaur, V. ; Gabyshev, N. ; Goh, Y. M. ; Golob, B. ; Haba, J. ; Hayasaka, K. ; Hoshi, Y. ; Hou, W. S. ; Hsiung, Y. B. ; Hyun, H. J. ; Inami, K. ; Ishikawa, A. ; Iwabuchi, M. ; Iwasaki, Y. ; Iwashita, T. ; Kang, J. H. ; Kawasaki, T. ; Kim, H. J. ; Kim, H. O. ; Kim, J. B. ; Kim, J. H. ; Kim, K. T. ; Kim, M. J. ; Kinoshita, K. ; Ko, B. R. ; Kobayashi, N. ; Kodyš, P. ; Korpar, S. ; Križan, P. ; Kuhr, T. ; Kumita, T. ; Kwon, Y. J. ; Lee, S. H. ; Li, J. ; Libby, J. ; Liu, Z. Q. ; Louvot, R. ; Matvienko, D. ; McOnie, S. ; Miyabayashi, K. ; Miyata, H. ; Mohanty, G. B. ; Moll, A. ; Nakano, E. ; Nakao, M. ; Neubauer, S. ; Nishida, S. ; Nishimura, K. ; Nitoh, O. ; Ohshima, T. ; Okuno, S. ; Park, C. W. ; Park, H. K. ; Pedlar, T. K. ; Pestotnik, R. ; Petrič, M. ; Piilonen, L. E. ; Ritter, M. ; Röhrken, M. ; Sahoo, H. ; Sakai, Y. ; Sanuki, T. ; Schneider, O. ; Schwanda, C. ; Schwartz, A. J. ; Senyo, K. ; Sevior, M. E. ; Shapkin, M. ; Shebalin, V. ; Shen, C. P. ; Shibata, T. A. ; Shiu, J. G. ; Simon, F. ; Smerkol, P. ; Sohn, Y. S. ; 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, C. H. ; Wang, M. Z. ; Wang, P. ; Watanabe, Y. ; Williams, K. M. ; Won, Eunil ; Yamaoka, J. ; Yamashita, Y. ; Yusa, Y. ; Zhilich, V. ; Zupanc, A. / Evidence for direct CP violation in B ±→ηh ± and observation of B0→ηK0. In: Physical Review Letters. 2012 ; Vol. 108, No. 3.
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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 772×106BB̄ 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.",
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. Bračko 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. Kodyš and S. Korpar and P. Križan 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. Petrič 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. Starič 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 Eunil Won and J. Yamaoka and Y. Yamashita and Y. Yusa and V. Zhilich and A. Zupanc",
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month = "1",
day = "20",
doi = "10.1103/PhysRevLett.108.031801",
language = "English",
volume = "108",
journal = "Physical Review Letters",
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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, Eunil

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.

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

U2 - 10.1103/PhysRevLett.108.031801

DO - 10.1103/PhysRevLett.108.031801

M3 - Article

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 3

M1 - 031801

ER -