Improved measurement of CP-violation parameters sin 2φ 1 and |λ|, B meson lifetimes, and B 0-B̄ 0 mixing parameter Δm d

K. Abe; K. Abe; I. Adachi; H. Aihara; M. Akatsu; Y. Asano; T. Aushev; T. Aziz; S. Bahinipati; A. M. Bakich; Y. Ban; S. Banerjee; A. Bay; I. Bedny; U. Bitenc; I. Bizjak; S. Blyth; A. Bondar; A. Bozek; M. Bračko; J. Brodzicka; T. E. Browder; P. Chang; Y. Chao; A. Chen; K. F. Chen; W. T. Chen; B. G. Cheon; R. Chistov; S. K. Choi; Y. Choi; A. Chuvikov; S. Cole; J. Dalseno; M. Danilov; M. Dash; A. Drutskoy; S. Eidelman; V. Eiges; F. Fang; S. Fratina; N. Gabyshev; A. Garmash; T. Gershon; A. Go; G. Gokhroo; B. Golob; J. Haba; K. Hara; N. C. Hastings; K. Hayasaka; H. Hayashii; M. Hazumi; I. Higuchi; T. Higuchi; L. Hinz; T. Hokuue; Y. Hoshi; S. Hou; W. S. Hou; T. Iijima; A. Imoto; K. Inami; A. Ishikawa; H. Ishino; R. Itoh; Y. Iwasaki; H. Kakuno; J. H. Kang; J. S. Kang; P. Kapusta; S. U. Kataoka; N. Katayama; H. Kawai; T. Kawasaki; H. Kichimi; H. J. Kim; J. H. Kim; S. K. Kim; S. M. Kim; K. Kinoshita; P. Koppenburg; S. Korpar; P. Križan; P. Krokovny; C. C. Kuo; Y. J. Kwon; J. S. Lange; G. Leder; S. H. Lee; T. Lesiak; J. Li; S. W. Lin; D. Liventsev; J. MacNaughton; G. Majumder; F. Mandl; D. Marlow; T. Matsumoto; A. Matyja; W. Mitaroff; K. Miyabayashi; H. Miyake; H. Miyata; R. Mizuk; T. Nagamine; Y. Nagasaka; I. Nakamura; E. Nakano; M. Nakao; S. Nishida; O. Nitoh; S. Noguchi; T. Nozaki; S. Ogawa; T. Ohshima; T. Okabe; S. Okuno; S. L. Olsen; Y. Onuki; W. Ostrowicz; H. Ozaki; P. Pakhlov; H. Palka; C. W. Park; N. Parslow; R. Pestotnik; L. E. Piilonen; M. Rozanska; H. Sagawa; Y. Sakai; N. Sato; T. Schietinger; O. Schneider; J. Schümann; C. Schwanda; A. J. Schwartz; S. Semenov; K. Senyo; M. E. Sevior; T. Shibata; H. Shibuya; B. Shwartz; V. Sidorov; J. B. Singh; A. Somov; N. Soni; R. Stamen; S. Stanič; M. Starič; K. Sumisawa; T. Sumiyoshi; S. Suzuki; S. Y. Suzuki; O. Tajima; F. Takasaki; K. Tamai; N. Tamura; M. Tanaka; Y. Teramoto; X. C. Tian; K. Trabelsi; T. Tsuboyama; T. Tsukamoto; S. Uehara; T. Uglov; K. Ueno; S. Uno; Y. Ushiroda; K. E. Varvell; S. Villa; C. C. Wang; C. H. Wang; M. Watanabe; Y. Watanabe; B. D. Yabsley; A. Yamaguchi; H. Yamamoto; Y. Yamashita; M. Yamauchi; J. Ying; Y. Yusa; C. C. Zhang; J. Zhang; L. M. Zhang; Z. P. Zhang; V. Zhilich; D. Žontar

doi:10.1103/PhysRevD.71.072003

Improved measurement of CP-violation parameters sin 2φ ₁ and |λ|, B meson lifetimes, and B ⁰-B̄ ⁰ mixing parameter Δm _d

K. Abe, K. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aushev, T. Aziz, S. Bahinipati, A. M. Bakich, Y. Ban, S. Banerjee, A. Bay, I. Bedny, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, A. Bozek, M. BračkoJ. Brodzicka, T. E. Browder, P. Chang, Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, A. Chuvikov, S. Cole, J. Dalseno, M. Danilov, M. Dash, A. Drutskoy, S. Eidelman, V. Eiges, F. Fang, S. Fratina, N. Gabyshev, A. Garmash, T. Gershon, A. Go, G. Gokhroo, B. Golob, J. Haba, K. Hara, N. C. Hastings, K. Hayasaka, H. Hayashii, M. Hazumi, I. Higuchi, T. Higuchi, L. Hinz, T. Hokuue, Y. Hoshi, S. Hou, W. S. Hou, T. Iijima, A. Imoto, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, Y. Iwasaki, H. Kakuno, J. H. Kang, J. S. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, H. J. Kim, J. H. Kim, S. K. Kim, S. M. Kim, K. Kinoshita, P. Koppenburg, S. Korpar, P. Križan, P. Krokovny, C. C. Kuo, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, T. Lesiak, J. Li, S. W. Lin, D. Liventsev, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsumoto, A. Matyja, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, T. Nagamine, Y. Nagasaka, I. Nakamura, E. Nakano, M. Nakao, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, N. Parslow, R. Pestotnik, L. E. Piilonen, M. Rozanska, H. Sagawa, Y. Sakai, N. Sato, T. Schietinger, O. Schneider, J. Schümann, C. Schwanda, A. J. Schwartz, S. Semenov, K. Senyo, M. E. Sevior, T. Shibata, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, A. Somov, N. Soni, R. Stamen, S. Stanič, M. Starič, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, O. Tajima, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, Y. Teramoto, X. C. Tian, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, T. Uglov, K. Ueno, S. Uno, Y. Ushiroda, K. E. Varvell, S. Villa, C. C. Wang, C. H. Wang, M. Watanabe, Y. Watanabe, B. D. Yabsley, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, J. Ying, Y. Yusa, C. C. Zhang, J. Zhang, L. M. Zhang, Z. P. Zhang, V. Zhilich, D. Žontar

Research output: Contribution to journal › Article › peer-review

114 Scopus citations

Abstract

We present a precise measurement of the standard model CP-violation parameter sin2φ ₁, the direct CP violation parameter |λ|, the lifetimes of charged and neutral B mesons and their ratio, and the B ⁰-B̄ ⁰ mixing parameter Δm _d based on a sample of 152 x 10 ⁶ BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e ⁺e ^- collider. One of two B mesons is fully reconstructed in a CP-eigenstate or a flavor-eigenstate decay channel. The flavor of the accompanying B meson is identified from its decay products. From the distributions of the time interval between the two B meson decay points, we obtain sin2φ ₁ = 0.728 ± 0.056(stat) ± 0.023(syst), |λ| = 1.007 ± 0.041(stat) ± 0.033(syst), τ _B0 = [1.534 ± 0.008(stat) ± 0.010(syst)] ps, τ _B+ = [1.635 ± 0.011(stat) ± 0.011(syst)] ps, τ _B+/ τ _B0 = 1.066 ± 0.008(stat) ± 0.008(syst) and Δm _d = [0.511 ± 0.005(stat) ± 0.006(syst) ps ^-1. The results for sin2φ ₁ and |λ| are consistent with the standard model expectations. The significance of the observed deviation from unity in the lifetime ratio exceeds 5 standard deviations.

Original language	English (US)
Article number	072003
Pages (from-to)	1-12
Number of pages	12
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	71
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.71.072003
State	Published - Apr 1 2005

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.71.072003

Cite this

Abe, K., Abe, K., Adachi, I., Aihara, H., Akatsu, M., Asano, Y., Aushev, T., Aziz, T., Bahinipati, S., Bakich, A. M., Ban, Y., Banerjee, S., Bay, A., Bedny, I., Bitenc, U., Bizjak, I., Blyth, S., Bondar, A., Bozek, A., ... Žontar, D. (2005). Improved measurement of CP-violation parameters sin 2φ ₁ and |λ|, B meson lifetimes, and B ⁰-B̄ ⁰ mixing parameter Δm _d Physical Review D - Particles, Fields, Gravitation and Cosmology, 71(7), 1-12. Article 072003. https://doi.org/10.1103/PhysRevD.71.072003

@article{1dc5d6603aee4a63a538b53e9f583fd0,

title = "Improved measurement of CP-violation parameters sin 2φ 1 and |λ|, B meson lifetimes, and B 0-{\=B} 0 mixing parameter Δm d ",

abstract = "We present a precise measurement of the standard model CP-violation parameter sin2φ 1, the direct CP violation parameter |λ|, the lifetimes of charged and neutral B mesons and their ratio, and the B 0-{\=B} 0 mixing parameter Δm d based on a sample of 152 x 10 6 B{\=B} pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. One of two B mesons is fully reconstructed in a CP-eigenstate or a flavor-eigenstate decay channel. The flavor of the accompanying B meson is identified from its decay products. From the distributions of the time interval between the two B meson decay points, we obtain sin2φ 1 = 0.728 ± 0.056(stat) ± 0.023(syst), |λ| = 1.007 ± 0.041(stat) ± 0.033(syst), τ B0 = [1.534 ± 0.008(stat) ± 0.010(syst)] ps, τ B+ = [1.635 ± 0.011(stat) ± 0.011(syst)] ps, τ B+/ τ B0 = 1.066 ± 0.008(stat) ± 0.008(syst) and Δm d = [0.511 ± 0.005(stat) ± 0.006(syst) ps -1. The results for sin2φ 1 and |λ| are consistent with the standard model expectations. The significance of the observed deviation from unity in the lifetime ratio exceeds 5 standard deviations.",

author = "K. Abe and K. Abe and I. Adachi and H. Aihara and M. Akatsu and Y. Asano and T. Aushev and T. Aziz and S. Bahinipati and Bakich, {A. M.} and Y. Ban and S. Banerjee and A. Bay and I. Bedny and U. Bitenc and I. Bizjak and S. Blyth and A. Bondar and A. Bozek and M. Bra{\v c}ko and J. Brodzicka and Browder, {T. E.} and P. Chang 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 A. Chuvikov and S. Cole and J. Dalseno and M. Danilov and M. Dash and A. Drutskoy and S. Eidelman and V. Eiges and F. Fang and S. Fratina and N. Gabyshev and A. Garmash and T. Gershon and A. Go and G. Gokhroo and B. Golob and J. Haba and K. Hara and Hastings, {N. C.} and K. Hayasaka and H. Hayashii and M. Hazumi and I. Higuchi and T. Higuchi and L. Hinz and T. Hokuue and Y. Hoshi and S. Hou and Hou, {W. S.} and T. Iijima and A. Imoto and K. Inami and A. Ishikawa and H. Ishino and R. Itoh and Y. Iwasaki and H. Kakuno and Kang, {J. H.} and Kang, {J. S.} and P. Kapusta and Kataoka, {S. U.} and N. Katayama and H. Kawai and T. Kawasaki and H. Kichimi and Kim, {H. J.} and Kim, {J. H.} and Kim, {S. K.} and Kim, {S. M.} and K. Kinoshita and P. Koppenburg and S. Korpar and P. Kri{\v z}an and P. Krokovny and Kuo, {C. C.} and Kwon, {Y. J.} and Lange, {J. S.} and G. Leder and Lee, {S. H.} and T. Lesiak and J. Li and Lin, {S. W.} and D. Liventsev and J. MacNaughton and G. Majumder and F. Mandl and D. Marlow and T. Matsumoto and A. Matyja and W. Mitaroff and K. Miyabayashi and H. Miyake and H. Miyata and R. Mizuk and T. Nagamine and Y. Nagasaka 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 T. Okabe and S. Okuno and Olsen, {S. L.} and Y. Onuki and W. Ostrowicz and H. Ozaki and P. Pakhlov and H. Palka and Park, {C. W.} and N. Parslow and R. Pestotnik and Piilonen, {L. E.} and M. Rozanska and H. Sagawa and Y. Sakai and N. Sato and T. Schietinger and O. Schneider and J. Sch{\"u}mann and C. Schwanda and Schwartz, {A. J.} and S. Semenov and K. Senyo and Sevior, {M. E.} and T. Shibata and H. Shibuya and B. Shwartz and V. Sidorov and Singh, {J. B.} and A. Somov and N. Soni and R. Stamen and S. Stani{\v c} and M. Stari{\v c} and K. Sumisawa and T. Sumiyoshi and S. Suzuki and Suzuki, {S. Y.} and O. Tajima and F. Takasaki and K. Tamai and N. Tamura and M. Tanaka and Y. Teramoto and Tian, {X. C.} and K. Trabelsi and T. Tsuboyama and T. Tsukamoto and S. Uehara and T. Uglov and K. Ueno and S. Uno and Y. Ushiroda and Varvell, {K. E.} and S. Villa and Wang, {C. C.} and Wang, {C. H.} and M. Watanabe and Y. Watanabe and Yabsley, {B. D.} and A. Yamaguchi and H. Yamamoto and Y. Yamashita and M. Yamauchi and J. Ying and Y. Yusa and Zhang, {C. C.} and J. Zhang and Zhang, {L. M.} and Zhang, {Z. P.} and V. Zhilich and D. {\v Z}ontar",

year = "2005",

month = apr,

day = "1",

doi = "10.1103/PhysRevD.71.072003",

language = "English (US)",

volume = "71",

pages = "1--12",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-7998",

number = "7",

}

Abe, K, Abe, K, Adachi, I, Aihara, H, Akatsu, M, Asano, Y, Aushev, T, Aziz, T, Bahinipati, S, Bakich, AM, Ban, Y, Banerjee, S, Bay, A, Bedny, I, Bitenc, U, Bizjak, I, Blyth, S, Bondar, A, Bozek, A, Bračko, M, Brodzicka, J, Browder, TE, Chang, P, Chao, Y, Chen, A, Chen, KF, Chen, WT, Cheon, BG, Chistov, R, Choi, SK, Choi, Y, Chuvikov, A, Cole, S, Dalseno, J, Danilov, M, Dash, M, Drutskoy, A, Eidelman, S, Eiges, V, Fang, F, Fratina, S, Gabyshev, N, Garmash, A, Gershon, T, Go, A, Gokhroo, G, Golob, B, Haba, J, Hara, K, Hastings, NC, Hayasaka, K, Hayashii, H, Hazumi, M, Higuchi, I, Higuchi, T, Hinz, L, Hokuue, T, Hoshi, Y, Hou, S, Hou, WS, Iijima, T, Imoto, A, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwasaki, Y, Kakuno, H, Kang, JH, Kang, JS, Kapusta, P, Kataoka, SU, Katayama, N, Kawai, H, Kawasaki, T, Kichimi, H, Kim, HJ, Kim, JH, Kim, SK, Kim, SM, Kinoshita, K, Koppenburg, P, Korpar, S, Križan, P, Krokovny, P, Kuo, CC, Kwon, YJ, Lange, JS, Leder, G, Lee, SH, Lesiak, T, Li, J, Lin, SW, Liventsev, D, MacNaughton, J, Majumder, G, Mandl, F, Marlow, D, Matsumoto, T, Matyja, A, Mitaroff, W, Miyabayashi, K, Miyake, H, Miyata, H, Mizuk, R, Nagamine, T, Nagasaka, Y, Nakamura, I, Nakano, E, Nakao, M, Nishida, S, Nitoh, O, Noguchi, S, Nozaki, T, Ogawa, S, Ohshima, T, Okabe, T, Okuno, S, Olsen, SL, Onuki, Y, Ostrowicz, W, Ozaki, H, Pakhlov, P, Palka, H, Park, CW, Parslow, N, Pestotnik, R, Piilonen, LE, Rozanska, M, Sagawa, H, Sakai, Y, Sato, N, Schietinger, T, Schneider, O, Schümann, J, Schwanda, C, Schwartz, AJ, Semenov, S, Senyo, K, Sevior, ME, Shibata, T, Shibuya, H, Shwartz, B, Sidorov, V, Singh, JB, Somov, A, Soni, N, Stamen, R, Stanič, S, Starič, M, Sumisawa, K, Sumiyoshi, T, Suzuki, S, Suzuki, SY, Tajima, O, Takasaki, F, Tamai, K, Tamura, N, Tanaka, M, Teramoto, Y, Tian, XC, Trabelsi, K, Tsuboyama, T, Tsukamoto, T, Uehara, S, Uglov, T, Ueno, K, Uno, S, Ushiroda, Y, Varvell, KE, Villa, S, Wang, CC, Wang, CH, Watanabe, M, Watanabe, Y, Yabsley, BD, Yamaguchi, A, Yamamoto, H, Yamashita, Y, Yamauchi, M, Ying, J, Yusa, Y, Zhang, CC, Zhang, J, Zhang, LM, Zhang, ZP, Zhilich, V & Žontar, D 2005, 'Improved measurement of CP-violation parameters sin 2φ ₁ and |λ|, B meson lifetimes, and B ⁰-B̄ ⁰ mixing parameter Δm _d ', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 71, no. 7, 072003, pp. 1-12. https://doi.org/10.1103/PhysRevD.71.072003

TY - JOUR

T1 - Improved measurement of CP-violation parameters sin 2φ 1 and |λ|, B meson lifetimes, and B 0-B̄ 0 mixing parameter Δm d

AU - Abe, K.

AU - Adachi, I.

AU - Aihara, H.

AU - Akatsu, M.

AU - Asano, Y.

AU - Aushev, T.

AU - Aziz, T.

AU - Bahinipati, S.

AU - Bakich, A. M.

AU - Ban, Y.

AU - Banerjee, S.

AU - Bay, A.

AU - Bedny, I.

AU - Bitenc, U.

AU - Bizjak, I.

AU - Blyth, S.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Brodzicka, J.

AU - Browder, T. E.

AU - Chang, P.

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 - Chuvikov, A.

AU - Cole, S.

AU - Dalseno, J.

AU - Danilov, M.

AU - Dash, M.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Eiges, V.

AU - Fang, F.

AU - Fratina, S.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gershon, T.

AU - Go, A.

AU - Gokhroo, G.

AU - Golob, B.

AU - Haba, J.

AU - Hara, K.

AU - Hastings, N. C.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hazumi, M.

AU - Higuchi, I.

AU - Higuchi, T.

AU - Hinz, L.

AU - Hokuue, T.

AU - Hoshi, Y.

AU - Hou, S.

AU - Hou, W. S.

AU - Iijima, T.

AU - Imoto, A.

AU - Inami, K.

AU - Ishikawa, A.

AU - Ishino, H.

AU - Itoh, R.

AU - Iwasaki, Y.

AU - Kakuno, H.

AU - Kang, J. H.

AU - Kang, J. S.

AU - Kapusta, P.

AU - Kataoka, S. U.

AU - Katayama, N.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kim, H. J.

AU - Kim, J. H.

AU - Kim, S. K.

AU - Kim, S. M.

AU - Kinoshita, K.

AU - Koppenburg, P.

AU - Korpar, S.

AU - Križan, P.

AU - Krokovny, P.

AU - Kuo, C. C.

AU - Kwon, Y. J.

AU - Lange, J. S.

AU - Leder, G.

AU - Lee, S. H.

AU - Lesiak, T.

AU - Li, J.

AU - Lin, S. W.

AU - Liventsev, D.

AU - MacNaughton, J.

AU - Majumder, G.

AU - Mandl, F.

AU - Marlow, D.

AU - Matsumoto, T.

AU - Matyja, A.

AU - Mitaroff, W.

AU - Miyabayashi, K.

AU - Miyake, H.

AU - Miyata, H.

AU - Mizuk, R.

AU - Nagamine, T.

AU - Nagasaka, Y.

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 - Okabe, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Ostrowicz, W.

AU - Ozaki, H.

AU - Pakhlov, P.

AU - Palka, H.

AU - Park, C. W.

AU - Parslow, N.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Rozanska, M.

AU - Sagawa, H.

AU - Sakai, Y.

AU - Sato, N.

AU - Schietinger, T.

AU - Schneider, O.

AU - Schümann, J.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Semenov, S.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shibata, T.

AU - Shibuya, H.

AU - Shwartz, B.

AU - Sidorov, V.

AU - Singh, J. B.

AU - Somov, A.

AU - Soni, N.

AU - Stamen, R.

AU - Stanič, S.

AU - Starič, M.

AU - Sumisawa, K.

AU - Sumiyoshi, T.

AU - Suzuki, S.

AU - Suzuki, S. Y.

AU - Tajima, O.

AU - Takasaki, F.

AU - Tamai, K.

AU - Tamura, N.

AU - Tanaka, M.

AU - Teramoto, Y.

AU - Tian, X. C.

AU - Trabelsi, K.

AU - Tsuboyama, T.

AU - Tsukamoto, T.

AU - Uehara, S.

AU - Uglov, T.

AU - Ueno, K.

AU - Uno, S.

AU - Ushiroda, Y.

AU - Varvell, K. E.

AU - Villa, S.

AU - Wang, C. C.

AU - Wang, C. H.

AU - Watanabe, M.

AU - Watanabe, Y.

AU - Yabsley, B. D.

AU - Yamaguchi, A.

AU - Yamamoto, H.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Ying, J.

AU - Yusa, Y.

AU - Zhang, C. C.

AU - Zhang, J.

AU - Zhang, L. M.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Žontar, D.

PY - 2005/4/1

Y1 - 2005/4/1

N2 - We present a precise measurement of the standard model CP-violation parameter sin2φ 1, the direct CP violation parameter |λ|, the lifetimes of charged and neutral B mesons and their ratio, and the B 0-B̄ 0 mixing parameter Δm d based on a sample of 152 x 10 6 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. One of two B mesons is fully reconstructed in a CP-eigenstate or a flavor-eigenstate decay channel. The flavor of the accompanying B meson is identified from its decay products. From the distributions of the time interval between the two B meson decay points, we obtain sin2φ 1 = 0.728 ± 0.056(stat) ± 0.023(syst), |λ| = 1.007 ± 0.041(stat) ± 0.033(syst), τ B0 = [1.534 ± 0.008(stat) ± 0.010(syst)] ps, τ B+ = [1.635 ± 0.011(stat) ± 0.011(syst)] ps, τ B+/ τ B0 = 1.066 ± 0.008(stat) ± 0.008(syst) and Δm d = [0.511 ± 0.005(stat) ± 0.006(syst) ps -1. The results for sin2φ 1 and |λ| are consistent with the standard model expectations. The significance of the observed deviation from unity in the lifetime ratio exceeds 5 standard deviations.

AB - We present a precise measurement of the standard model CP-violation parameter sin2φ 1, the direct CP violation parameter |λ|, the lifetimes of charged and neutral B mesons and their ratio, and the B 0-B̄ 0 mixing parameter Δm d based on a sample of 152 x 10 6 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. One of two B mesons is fully reconstructed in a CP-eigenstate or a flavor-eigenstate decay channel. The flavor of the accompanying B meson is identified from its decay products. From the distributions of the time interval between the two B meson decay points, we obtain sin2φ 1 = 0.728 ± 0.056(stat) ± 0.023(syst), |λ| = 1.007 ± 0.041(stat) ± 0.033(syst), τ B0 = [1.534 ± 0.008(stat) ± 0.010(syst)] ps, τ B+ = [1.635 ± 0.011(stat) ± 0.011(syst)] ps, τ B+/ τ B0 = 1.066 ± 0.008(stat) ± 0.008(syst) and Δm d = [0.511 ± 0.005(stat) ± 0.006(syst) ps -1. The results for sin2φ 1 and |λ| are consistent with the standard model expectations. The significance of the observed deviation from unity in the lifetime ratio exceeds 5 standard deviations.

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U2 - 10.1103/PhysRevD.71.072003

DO - 10.1103/PhysRevD.71.072003

M3 - Article

AN - SCOPUS:18444393703

SN - 1550-7998

VL - 71

SP - 1

EP - 12

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 7

M1 - 072003

ER -

Improved measurement of CP-violation parameters sin 2φ ₁ and |λ|, B meson lifetimes, and B ⁰-B̄ ⁰ mixing parameter Δm _d

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