Observation of B0→ΛΛ̄K0 and B0→Λ Λ̄K*0 at Belle

Y. W. Chang; M. Z. Wang; I. Adachi; H. Aihara; T. Aushev; A. M. Bakich; V. Balagura; A. Bay; V. Bhardwaj; U. Bitenc; A. Bondar; A. Bozek; M. Bračko; T. E. Browder; Y. Chao; A. Chen; R. Chistov; Y. Choi; J. Dalseno; M. Danilov; M. Dash; A. Drutskoy; S. Eidelman; P. Goldenzweig; H. Ha; B. Y. Han; T. Hara; K. Hayasaka; H. Hayashii; M. Hazumi; D. Heffernan; Y. Horii; Y. Hoshi; W. S. Hou; H. J. Hyun; K. Inami; A. Ishikawa; M. Iwasaki; Y. Iwasaki; N. J. Joshi; D. H. Kah; J. H. Kang; H. Kawai; T. Kawasaki; H. Kichimi; H. J. Kim; Y. I. Kim; Y. J. Kim; B. R. Ko; S. Korpar; P. Križan; Y. J. Kwon; S. H. Kyeong; J. S. Lee; M. J. Lee; S. E. Lee; T. Lesiak; A. Limosani; S. W. Lin; C. Liu; Y. Liu; R. Louvot; F. Mandl; A. Matyja; S. McOnie; K. Miyabayashi; H. Miyata; Y. Miyazaki; R. Mizuk; Y. Nagasaka; M. Nakao; Z. Natkaniec; S. Nishida; O. Nitoh; S. Ogawa; S. Okuno; H. Ozaki; P. Pakhlov; G. Pakhlova; C. W. Park; H. K. Park; K. S. Park; L. S. Peak; R. Pestotnik; L. E. Piilonen; M. Rozanska; H. Sahoo; Y. Sakai; O. Schneider; A. Sekiya; K. Senyo; M. Shapkin; J. G. Shiu; B. Shwartz; J. B. Singh; S. Stanič; M. Starič; K. Sumisawa; M. Tanaka; G. N. Taylor; Y. Teramoto; I. Tikhomirov; S. Uehara; T. Uglov; Y. Unno; S. Uno; Y. Usov; G. Varner; K. Vervink; C. H. Wang; P. Wang; X. L. Wang; Y. Watanabe; R. Wedd; J. T. Wei; E. Won; B. D. Yabsley; Y. Yamashita; Z. P. Zhang; V. Zhilich; T. Zivko; A. Zupanc; O. Zyukova

doi:10.1103/PhysRevD.79.052006

Observation of B0→ΛΛ̄K0 and B0→Λ Λ̄K*0 at Belle

Y. W. Chang, M. Z. Wang, I. Adachi, H. Aihara, T. Aushev, A. M. Bakich, V. Balagura, A. Bay, V. Bhardwaj, U. Bitenc, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, Y. Chao, A. Chen, R. Chistov, Y. Choi, J. Dalseno, M. DanilovM. Dash, A. Drutskoy, S. Eidelman, P. Goldenzweig, H. Ha, B. Y. Han, T. Hara, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, K. Inami, A. Ishikawa, M. Iwasaki, Y. Iwasaki, N. J. Joshi, D. H. Kah, J. H. Kang, H. Kawai, T. Kawasaki, H. Kichimi, H. J. Kim, Y. I. Kim, Y. J. Kim, B. R. Ko, S. Korpar, P. Križan, Y. J. Kwon, S. H. Kyeong, J. S. Lee, M. J. Lee, S. E. Lee, T. Lesiak, A. Limosani, S. W. Lin, C. Liu, Y. Liu, R. Louvot, F. Mandl, A. Matyja, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, Y. Nagasaka, M. Nakao, Z. Natkaniec, S. Nishida, O. Nitoh, S. Ogawa, S. Okuno, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, H. K. Park, K. S. Park, L. S. Peak, R. Pestotnik, L. E. Piilonen, M. Rozanska, H. Sahoo, Y. Sakai, O. Schneider, A. Sekiya, K. Senyo, M. Shapkin, J. G. Shiu, B. Shwartz, J. B. Singh, S. Stanič, M. Starič, K. Sumisawa, M. Tanaka, G. N. Taylor, Y. Teramoto, I. Tikhomirov, S. Uehara, T. Uglov, Y. Unno, S. Uno, Y. Usov, G. Varner, K. Vervink, C. H. Wang, P. Wang, X. L. Wang, Y. Watanabe, R. Wedd, J. T. Wei, E. Won, B. D. Yabsley, Y. Yamashita, Z. P. Zhang, V. Zhilich, T. Zivko, A. Zupanc, O. Zyukova

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Abstract

We study the charmless decays B→ΛΛ̄h, where h stands for π+, K+, K0,K*+, or K*0, using a 605fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. We observe B0→ΛΛ̄K0 and B0→ΛΛ̄K*0 with branching fractions of (4.76-0.68+0.84(stat)±0.61(syst))×10-6 and (2.46-0.72+0. 87±0.34)×10-6, respectively. The significances of these signals in the threshold-mass enhanced mass region, MΛΛ̄<2.85GeV/c2, are 12.4σ and 9.3σ, respectively. We also update the branching fraction B(B+→ΛΛ̄K+)=(3.38-0.36+0.41±0.41) ×10-6 with better accuracy, and report the following measurement or 90% confidence level upper limit in the threshold-mass-enhanced region: B(B+→ΛΛ̄K*+)=(2.19-0.88+1.13±0.33) ×10-6 with 3.7σ significance; B(B+→ΛΛ̄π+) <0.94×10-6. A related search for B0→ΛΛ̄D̄0 yields a branching fraction B(B0→ΛΛ̄D̄0)=(1.05-0. 44+0.57±0.14)×10-5. This may be compared with the large, ∼10-4, branching fraction observed for B0→pp̄D̄0. The MΛΛ̄ enhancements near threshold and related angular distributions for the observed modes are also reported.

Original language	English
Article number	052006
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	79
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.79.052006
State	Published - 2 Mar 2009

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Chang, Y. W., Wang, M. Z., Adachi, I., Aihara, H., Aushev, T., Bakich, A. M., Balagura, V., Bay, A., Bhardwaj, V., Bitenc, U., Bondar, A., Bozek, A., Bračko, M., Browder, T. E., Chao, Y., Chen, A., Chistov, R., Choi, Y., Dalseno, J., ... Zyukova, O. (2009). Observation of B0→ΛΛ̄K0 and B0→Λ Λ̄K*0 at Belle. Physical Review D - Particles, Fields, Gravitation and Cosmology, 79(5), Article 052006. https://doi.org/10.1103/PhysRevD.79.052006

@article{bc6a37e3b8624d5e99ddbfc35e7b80a0,

title = "Observation of B0→Λ{\=Λ}K0 and B0→Λ {\=Λ}K*0 at Belle",

abstract = "We study the charmless decays B→Λ{\=Λ}h, where h stands for π+, K+, K0,K*+, or K*0, using a 605fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. We observe B0→Λ{\=Λ}K0 and B0→Λ{\=Λ}K*0 with branching fractions of (4.76-0.68+0.84(stat)±0.61(syst))×10-6 and (2.46-0.72+0. 87±0.34)×10-6, respectively. The significances of these signals in the threshold-mass enhanced mass region, MΛ{\=Λ}<2.85GeV/c2, are 12.4σ and 9.3σ, respectively. We also update the branching fraction B(B+→Λ{\=Λ}K+)=(3.38-0.36+0.41±0.41) ×10-6 with better accuracy, and report the following measurement or 90% confidence level upper limit in the threshold-mass-enhanced region: B(B+→Λ{\=Λ}K*+)=(2.19-0.88+1.13±0.33) ×10-6 with 3.7σ significance; B(B+→Λ{\=Λ}π+) <0.94×10-6. A related search for B0→Λ{\=Λ}{\=D}0 yields a branching fraction B(B0→Λ{\=Λ}{\=D}0)=(1.05-0. 44+0.57±0.14)×10-5. This may be compared with the large, ∼10-4, branching fraction observed for B0→p{\=p}{\=D}0. The MΛ{\=Λ} enhancements near threshold and related angular distributions for the observed modes are also reported.",

author = "Chang, {Y. W.} and Wang, {M. Z.} and I. Adachi and H. Aihara and T. Aushev and Bakich, {A. M.} and V. Balagura and A. Bay and V. Bhardwaj and U. Bitenc and A. Bondar and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and Y. Chao and A. Chen and R. Chistov and Y. Choi and J. Dalseno and M. Danilov and M. Dash and A. Drutskoy and S. Eidelman and P. Goldenzweig and H. Ha and Han, {B. Y.} and T. Hara and K. Hayasaka and H. Hayashii and M. Hazumi and D. Heffernan and Y. Horii and Y. Hoshi and Hou, {W. S.} and Hyun, {H. J.} and K. Inami and A. Ishikawa and M. Iwasaki and Y. Iwasaki and Joshi, {N. J.} and Kah, {D. H.} and Kang, {J. H.} and H. Kawai and T. Kawasaki and H. Kichimi and Kim, {H. J.} and Kim, {Y. I.} and Kim, {Y. J.} and Ko, {B. R.} and S. Korpar and P. Kri{\v z}an and Kwon, {Y. J.} and Kyeong, {S. H.} and Lee, {J. S.} and Lee, {M. J.} and Lee, {S. E.} and T. Lesiak and A. Limosani and Lin, {S. W.} and C. Liu and Y. Liu and R. Louvot and F. Mandl and A. Matyja and S. McOnie and K. Miyabayashi and H. Miyata and Y. Miyazaki and R. Mizuk and Y. Nagasaka and M. Nakao and Z. Natkaniec and S. Nishida and O. Nitoh and S. Ogawa and S. Okuno and H. Ozaki and P. Pakhlov and G. Pakhlova and Park, {C. W.} and Park, {H. K.} and Park, {K. S.} and Peak, {L. S.} and R. Pestotnik and Piilonen, {L. E.} and M. Rozanska and H. Sahoo and Y. Sakai and O. Schneider and A. Sekiya and K. Senyo and M. Shapkin and Shiu, {J. G.} and B. Shwartz and Singh, {J. B.} and S. Stani{\v c} and M. Stari{\v c} and K. Sumisawa and M. Tanaka and Taylor, {G. N.} and Y. Teramoto and I. Tikhomirov and S. Uehara and T. Uglov and Y. Unno and S. Uno and Y. Usov and G. Varner and K. Vervink and Wang, {C. H.} and P. Wang and Wang, {X. L.} and Y. Watanabe and R. Wedd and Wei, {J. T.} and E. Won and Yabsley, {B. D.} and Y. Yamashita and Zhang, {Z. P.} and V. Zhilich and T. Zivko and A. Zupanc and O. Zyukova",

year = "2009",

month = mar,

day = "2",

doi = "10.1103/PhysRevD.79.052006",

language = "English",

volume = "79",

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

issn = "1550-7998",

publisher = "American Physical Society",

number = "5",

}

Chang, YW, Wang, MZ, Adachi, I, Aihara, H, Aushev, T, Bakich, AM, Balagura, V, Bay, A, Bhardwaj, V, Bitenc, U, Bondar, A, Bozek, A, Bračko, M, Browder, TE, Chao, Y, Chen, A, Chistov, R, Choi, Y, Dalseno, J, Danilov, M, Dash, M, Drutskoy, A, Eidelman, S, Goldenzweig, P, Ha, H, Han, BY, Hara, T, Hayasaka, K, Hayashii, H, Hazumi, M, Heffernan, D, Horii, Y, Hoshi, Y, Hou, WS, Hyun, HJ, Inami, K, Ishikawa, A, Iwasaki, M, Iwasaki, Y, Joshi, NJ, Kah, DH, Kang, JH, Kawai, H, Kawasaki, T, Kichimi, H, Kim, HJ, Kim, YI, Kim, YJ, Ko, BR, Korpar, S, Križan, P, Kwon, YJ, Kyeong, SH, Lee, JS, Lee, MJ, Lee, SE, Lesiak, T, Limosani, A, Lin, SW, Liu, C, Liu, Y, Louvot, R, Mandl, F, Matyja, A, McOnie, S, Miyabayashi, K, Miyata, H, Miyazaki, Y, Mizuk, R, Nagasaka, Y, Nakao, M, Natkaniec, Z, Nishida, S, Nitoh, O, Ogawa, S, Okuno, S, Ozaki, H, Pakhlov, P, Pakhlova, G, Park, CW, Park, HK, Park, KS, Peak, LS, Pestotnik, R, Piilonen, LE, Rozanska, M, Sahoo, H, Sakai, Y, Schneider, O, Sekiya, A, Senyo, K, Shapkin, M, Shiu, JG, Shwartz, B, Singh, JB, Stanič, S, Starič, M, Sumisawa, K, Tanaka, M, Taylor, GN, Teramoto, Y, Tikhomirov, I, Uehara, S, Uglov, T, Unno, Y, Uno, S, Usov, Y, Varner, G, Vervink, K, Wang, CH, Wang, P, Wang, XL, Watanabe, Y, Wedd, R, Wei, JT, Won, E, Yabsley, BD, Yamashita, Y, Zhang, ZP, Zhilich, V, Zivko, T, Zupanc, A & Zyukova, O 2009, 'Observation of B0→ΛΛ̄K0 and B0→Λ Λ̄K*0 at Belle', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 79, no. 5, 052006. https://doi.org/10.1103/PhysRevD.79.052006

TY - JOUR

T1 - Observation of B0→ΛΛ̄K0 and B0→Λ Λ̄K*0 at Belle

AU - Chang, Y. W.

AU - Wang, M. Z.

AU - Adachi, I.

AU - Aihara, H.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Balagura, V.

AU - Bay, A.

AU - Bhardwaj, V.

AU - Bitenc, U.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chao, Y.

AU - Chen, A.

AU - Chistov, R.

AU - Choi, Y.

AU - Dalseno, J.

AU - Danilov, M.

AU - Dash, M.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Goldenzweig, P.

AU - Ha, H.

AU - Han, B. Y.

AU - Hara, T.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hazumi, M.

AU - Heffernan, D.

AU - Horii, Y.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hyun, H. J.

AU - Inami, K.

AU - Ishikawa, A.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Joshi, N. J.

AU - Kah, D. H.

AU - Kang, J. H.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kim, H. J.

AU - Kim, Y. I.

AU - Kim, Y. J.

AU - Ko, B. R.

AU - Korpar, S.

AU - Križan, P.

AU - Kwon, Y. J.

AU - Kyeong, S. H.

AU - Lee, J. S.

AU - Lee, M. J.

AU - Lee, S. E.

AU - Lesiak, T.

AU - Limosani, A.

AU - Lin, S. W.

AU - Liu, C.

AU - Liu, Y.

AU - Louvot, R.

AU - Mandl, F.

AU - Matyja, A.

AU - McOnie, S.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Nagasaka, Y.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nitoh, O.

AU - Ogawa, S.

AU - Okuno, S.

AU - Ozaki, H.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, C. W.

AU - Park, H. K.

AU - Park, K. S.

AU - Peak, L. S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Rozanska, M.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Schneider, O.

AU - Sekiya, A.

AU - Senyo, K.

AU - Shapkin, M.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Singh, J. B.

AU - Stanič, S.

AU - Starič, M.

AU - Sumisawa, K.

AU - Tanaka, M.

AU - Taylor, G. N.

AU - Teramoto, Y.

AU - Tikhomirov, I.

AU - Uehara, S.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Usov, Y.

AU - Varner, G.

AU - Vervink, K.

AU - Wang, C. H.

AU - Wang, P.

AU - Wang, X. L.

AU - Watanabe, Y.

AU - Wedd, R.

AU - Wei, J. T.

AU - Won, E.

AU - Yabsley, B. D.

AU - Yamashita, Y.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zivko, T.

AU - Zupanc, A.

AU - Zyukova, O.

PY - 2009/3/2

Y1 - 2009/3/2

N2 - We study the charmless decays B→ΛΛ̄h, where h stands for π+, K+, K0,K*+, or K*0, using a 605fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. We observe B0→ΛΛ̄K0 and B0→ΛΛ̄K*0 with branching fractions of (4.76-0.68+0.84(stat)±0.61(syst))×10-6 and (2.46-0.72+0. 87±0.34)×10-6, respectively. The significances of these signals in the threshold-mass enhanced mass region, MΛΛ̄<2.85GeV/c2, are 12.4σ and 9.3σ, respectively. We also update the branching fraction B(B+→ΛΛ̄K+)=(3.38-0.36+0.41±0.41) ×10-6 with better accuracy, and report the following measurement or 90% confidence level upper limit in the threshold-mass-enhanced region: B(B+→ΛΛ̄K*+)=(2.19-0.88+1.13±0.33) ×10-6 with 3.7σ significance; B(B+→ΛΛ̄π+) <0.94×10-6. A related search for B0→ΛΛ̄D̄0 yields a branching fraction B(B0→ΛΛ̄D̄0)=(1.05-0. 44+0.57±0.14)×10-5. This may be compared with the large, ∼10-4, branching fraction observed for B0→pp̄D̄0. The MΛΛ̄ enhancements near threshold and related angular distributions for the observed modes are also reported.

AB - We study the charmless decays B→ΛΛ̄h, where h stands for π+, K+, K0,K*+, or K*0, using a 605fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. We observe B0→ΛΛ̄K0 and B0→ΛΛ̄K*0 with branching fractions of (4.76-0.68+0.84(stat)±0.61(syst))×10-6 and (2.46-0.72+0. 87±0.34)×10-6, respectively. The significances of these signals in the threshold-mass enhanced mass region, MΛΛ̄<2.85GeV/c2, are 12.4σ and 9.3σ, respectively. We also update the branching fraction B(B+→ΛΛ̄K+)=(3.38-0.36+0.41±0.41) ×10-6 with better accuracy, and report the following measurement or 90% confidence level upper limit in the threshold-mass-enhanced region: B(B+→ΛΛ̄K*+)=(2.19-0.88+1.13±0.33) ×10-6 with 3.7σ significance; B(B+→ΛΛ̄π+) <0.94×10-6. A related search for B0→ΛΛ̄D̄0 yields a branching fraction B(B0→ΛΛ̄D̄0)=(1.05-0. 44+0.57±0.14)×10-5. This may be compared with the large, ∼10-4, branching fraction observed for B0→pp̄D̄0. The MΛΛ̄ enhancements near threshold and related angular distributions for the observed modes are also reported.

UR - http://www.scopus.com/inward/record.url?scp=64849089850&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.79.052006

DO - 10.1103/PhysRevD.79.052006

M3 - Article

AN - SCOPUS:64849089850

SN - 1550-7998

VL - 79

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

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

IS - 5

M1 - 052006

ER -

Observation of B0→ΛΛ̄K0 and B0→Λ Λ̄K*0 at Belle

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