Measurement of inclusive Ds, D0, and J/ψ rates and determination of the Bs(*)B̄s(*) production fraction in bb̄ events at the Υ(5S) resonance

A. Drutskoy; K. Abe; K. Abe; I. Adachi; H. Aihara; D. Anipko; K. Arinstein; V. Aulchenko; T. Aushev; S. Banerjee; E. Barberio; M. Barbero; I. Bedny; K. Belous; 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; Y. Choi; Y. K. Choi; A. Chuvikov; S. Cole; J. Dalseno; M. Danilov; M. Dash; J. Dragic; S. Eidelman; D. Epifanov; S. Fratina; N. Gabyshev; T. Gershon; A. Go; G. Gokhroo; P. Goldenzweig; B. Golob; H. Ha; J. Haba; T. Hara; K. Hayasaka; H. Hayashii; M. Hazumi; D. Heffernan; T. Higuchi; Y. Hoshi; S. Hou; W. S. Hou; Y. B. Hsiung; T. Iijima; A. Imoto; K. Inami; A. Ishikawa; R. Itoh; M. Iwasaki; Y. Iwasaki; J. H. Kang; N. Katayama; H. Kawai; T. Kawasaki; H. R. Khan; H. Kichimi; S. K. Kim; Y. J. Kim; K. Kinoshita; S. Korpar; P. Križan; P. Krokovny; R. Kulasiri; R. Kumar; C. C. Kuo; A. Kuzmin; Y. J. Kwon; J. S. Lange; G. Leder; J. Lee; M. J. Lee; T. Lesiak; J. Li; A. Limosani; S. W. Lin; D. Liventsev; J. MacNaughton; G. Majumder; F. Mandl; T. Matsumoto; A. Matyja; S. McOnie; W. Mitaroff; K. Miyabayashi; H. Miyake; H. Miyata; Y. Miyazaki; R. Mizuk; G. R. Moloney; T. Nagamine; Y. Nagasaka; E. Nakano; M. Nakao; Z. Natkaniec; S. Nishida; O. Nitoh; T. Nozaki; S. Ogawa; T. Ohshima; S. Okuno; S. L. Olsen; Y. Onuki; P. Pakhlov; G. Pakhlova; H. Park; K. S. Park; R. Pestotnik; L. E. Piilonen; A. Poluektov; Y. Sakai; N. Satoyama; T. Schietinger; O. Schneider; C. Schwanda; A. J. Schwartz; R. Seidl; K. Senyo; M. E. Sevior; M. Shapkin; H. Shibuya; B. Shwartz; V. Sidorov; J. B. Singh; A. Sokolov; A. Somov; S. Stanič; M. Starič; H. Stoeck; K. Sumisawa; T. Sumiyoshi; S. Suzuki; S. Y. Suzuki; F. Takasaki; K. Tamai; N. Tamura; M. Tanaka; G. N. Taylor; Y. Teramoto; X. C. Tian; K. Trabelsi; T. Tsukamoto; S. Uehara; T. Uglov; K. Ueno; Y. Unno; S. Uno; P. Urquijo; Y. Usov; G. Varner; S. Villa; C. C. Wang; C. H. Wang; Y. Watanabe; J. Wiechczynski; E. Won; Q. L. Xie; B. D. Yabsley; A. Yamaguchi; Y. Yamashita; M. Yamauchi; Y. Yusa; L. M. Zhang; Z. P. Zhang; V. Zhilich; A. Zupanc

doi:10.1103/PhysRevLett.98.052001

Measurement of inclusive Ds, D0, and J/ψ rates and determination of the Bs()B̄s() production fraction in bb̄ events at the Υ(5S) resonance

A. Drutskoy, K. Abe, K. Abe, I. Adachi, H. Aihara, D. Anipko, K. Arinstein, V. Aulchenko, T. Aushev, S. Banerjee, E. Barberio, M. Barbero, I. Bedny, K. Belous, 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, Y. Choi, Y. K. Choi, A. Chuvikov, S. Cole, J. Dalseno, M. Danilov, M. Dash, J. Dragic, S. Eidelman, D. Epifanov, S. Fratina, N. Gabyshev, T. Gershon, A. Go, G. Gokhroo, P. Goldenzweig, B. Golob, H. Ha, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, T. Higuchi, Y. Hoshi, S. Hou, W. S. Hou, Y. B. Hsiung, T. Iijima, A. Imoto, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, J. H. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. R. Khan, H. Kichimi, S. K. Kim, Y. J. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, R. Kumar, C. C. Kuo, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, J. Lee, M. J. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, D. Liventsev, J. MacNaughton, G. Majumder, F. Mandl, T. Matsumoto, A. Matyja, S. McOnie, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, G. R. Moloney, T. Nagamine, Y. Nagasaka, E. Nakano, M. Nakao, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, G. Pakhlova, H. Park, K. S. Park, R. Pestotnik, L. E. Piilonen, A. Poluektov, Y. Sakai, N. Satoyama, T. Schietinger, O. Schneider, C. Schwanda, A. J. Schwartz, R. Seidl, K. Senyo, M. E. Sevior, M. Shapkin, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, A. Sokolov, A. Somov, S. Stanič, M. Starič, H. Stoeck, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, G. N. Taylor, Y. Teramoto, X. C. Tian, K. Trabelsi, T. Tsukamoto, S. Uehara, T. Uglov, K. Ueno, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, S. Villa, C. C. Wang, C. H. Wang, Y. Watanabe, J. Wiechczynski, E. Won, Q. L. Xie, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, Y. Yusa, L. M. Zhang, Z. P. Zhang, V. Zhilich, A. Zupanc

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

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Abstract

The inclusive production of Ds, D0, and J/ψ mesons is studied using a 1.86fb-1 data sample collected on the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The number of bb̄ events in this Υ(5S) data sample is determined. We measure the branching fractions B(Υ(5S)→DsX)/2=(23.6±1.2±3.6)%, B(Υ(5S)→D0X)/2=(53.8±2.0±3.4)%, and B(Υ(5S)→J/ ψX)/2=(1.030±0.080±0.067)%. From the Ds and D0 inclusive branching fractions the ratio fs=(18.0±1.3±3.2)% of Bs(*)B̄s(*) to the total bb̄ quark pair production at the Υ(5S) energy is obtained in a model-dependent way.

Original language	English
Article number	052001
Journal	Physical review letters
Volume	98
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.98.052001
Publication status	Published - 2007

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.98.052001

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Drutskoy, A., Abe, K., Abe, K., Adachi, I., Aihara, H., Anipko, D., Arinstein, K., Aulchenko, V., Aushev, T., Banerjee, S., Barberio, E., Barbero, M., Bedny, I., Belous, K., Bitenc, U., Bizjak, I., Blyth, S., Bondar, A., Bozek, A., ... Zupanc, A. (2007). Measurement of inclusive Ds, D0, and J/ψ rates and determination of the Bs(*)B̄s(*) production fraction in bb̄ events at the Υ(5S) resonance. Physical review letters, 98(5), Article 052001. https://doi.org/10.1103/PhysRevLett.98.052001

Drutskoy, A, Abe, K, Abe, K, Adachi, I, Aihara, H, Anipko, D, Arinstein, K, Aulchenko, V, Aushev, T, Banerjee, S, Barberio, E, Barbero, M, Bedny, I, Belous, K, 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, Y, Choi, YK, Chuvikov, A, Cole, S, Dalseno, J, Danilov, M, Dash, M, Dragic, J, Eidelman, S, Epifanov, D, Fratina, S, Gabyshev, N, Gershon, T, Go, A, Gokhroo, G, Goldenzweig, P, Golob, B, Ha, H, Haba, J, Hara, T, Hayasaka, K, Hayashii, H, Hazumi, M, Heffernan, D, Higuchi, T, Hoshi, Y, Hou, S, Hou, WS, Hsiung, YB, Iijima, T, Imoto, A, Inami, K, Ishikawa, A, Itoh, R, Iwasaki, M, Iwasaki, Y, Kang, JH, Katayama, N, Kawai, H, Kawasaki, T, Khan, HR, Kichimi, H, Kim, SK, Kim, YJ, Kinoshita, K, Korpar, S, Križan, P, Krokovny, P, Kulasiri, R, Kumar, R, Kuo, CC, Kuzmin, A, Kwon, YJ, Lange, JS, Leder, G, Lee, J, Lee, MJ, Lesiak, T, Li, J, Limosani, A, Lin, SW, Liventsev, D, MacNaughton, J, Majumder, G, Mandl, F, Matsumoto, T, Matyja, A, McOnie, S, Mitaroff, W, Miyabayashi, K, Miyake, H, Miyata, H, Miyazaki, Y, Mizuk, R, Moloney, GR, Nagamine, T, Nagasaka, Y, Nakano, E, Nakao, M, Natkaniec, Z, Nishida, S, Nitoh, O, Nozaki, T, Ogawa, S, Ohshima, T, Okuno, S, Olsen, SL, Onuki, Y, Pakhlov, P, Pakhlova, G, Park, H, Park, KS, Pestotnik, R, Piilonen, LE, Poluektov, A, Sakai, Y, Satoyama, N, Schietinger, T, Schneider, O, Schwanda, C, Schwartz, AJ, Seidl, R, Senyo, K, Sevior, ME, Shapkin, M, Shibuya, H, Shwartz, B, Sidorov, V, Singh, JB, Sokolov, A, Somov, A, Stanič, S, Starič, M, Stoeck, H, Sumisawa, K, Sumiyoshi, T, Suzuki, S, Suzuki, SY, Takasaki, F, Tamai, K, Tamura, N, Tanaka, M, Taylor, GN, Teramoto, Y, Tian, XC, Trabelsi, K, Tsukamoto, T, Uehara, S, Uglov, T, Ueno, K, Unno, Y, Uno, S, Urquijo, P, Usov, Y, Varner, G, Villa, S, Wang, CC, Wang, CH, Watanabe, Y, Wiechczynski, J, Won, E, Xie, QL, Yabsley, BD, Yamaguchi, A, Yamashita, Y, Yamauchi, M, Yusa, Y, Zhang, LM, Zhang, ZP, Zhilich, V & Zupanc, A 2007, 'Measurement of inclusive Ds, D0, and J/ψ rates and determination of the Bs(*)B̄s(*) production fraction in bb̄ events at the Υ(5S) resonance', Physical review letters, vol. 98, no. 5, 052001. https://doi.org/10.1103/PhysRevLett.98.052001

@article{615307f172524f6c9b622eed298de761,

title = "Measurement of inclusive Ds, D0, and J/ψ rates and determination of the Bs(*){\=B}s(*) production fraction in b{\=b} events at the Υ(5S) resonance",

abstract = "The inclusive production of Ds, D0, and J/ψ mesons is studied using a 1.86fb-1 data sample collected on the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The number of b{\=b} events in this Υ(5S) data sample is determined. We measure the branching fractions B(Υ(5S)→DsX)/2=(23.6±1.2±3.6)%, B(Υ(5S)→D0X)/2=(53.8±2.0±3.4)%, and B(Υ(5S)→J/ ψX)/2=(1.030±0.080±0.067)%. From the Ds and D0 inclusive branching fractions the ratio fs=(18.0±1.3±3.2)% of Bs(*){\=B}s(*) to the total b{\=b} quark pair production at the Υ(5S) energy is obtained in a model-dependent way.",

author = "A. Drutskoy 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 S. Banerjee and E. Barberio and M. Barbero and I. Bedny and K. Belous 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 Y. Choi and Choi, {Y. K.} and A. Chuvikov and S. Cole and J. Dalseno and M. Danilov and M. Dash and J. Dragic and S. Eidelman and D. Epifanov and S. Fratina and N. Gabyshev and T. Gershon and A. Go and G. Gokhroo and P. Goldenzweig 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 T. Higuchi and Y. Hoshi and S. Hou and Hou, {W. S.} and Hsiung, {Y. B.} and T. Iijima and A. Imoto and K. Inami and A. Ishikawa and R. Itoh and M. Iwasaki and Y. Iwasaki and Kang, {J. H.} and N. Katayama and H. Kawai and T. Kawasaki and Khan, {H. R.} and H. Kichimi and Kim, {S. K.} and Kim, {Y. J.} and K. Kinoshita and S. Korpar and P. Kri{\v z}an and P. Krokovny and R. Kulasiri and R. Kumar and Kuo, {C. C.} and A. Kuzmin and Kwon, {Y. J.} and Lange, {J. S.} and G. Leder and J. Lee and Lee, {M. J.} and T. Lesiak and J. Li and A. Limosani and Lin, {S. W.} and D. Liventsev and J. MacNaughton and G. Majumder and F. Mandl and T. Matsumoto and A. Matyja and S. McOnie and W. Mitaroff and K. Miyabayashi and H. Miyake and H. Miyata and Y. Miyazaki and R. Mizuk and Moloney, {G. R.} and T. Nagamine and Y. Nagasaka and E. Nakano and M. Nakao and Z. Natkaniec and S. Nishida and O. Nitoh and T. Nozaki and S. Ogawa and T. Ohshima and S. Okuno and Olsen, {S. L.} and Y. Onuki and P. Pakhlov and G. Pakhlova and H. Park and Park, {K. S.} and R. Pestotnik and Piilonen, {L. E.} and A. Poluektov and Y. Sakai and N. Satoyama and T. Schietinger and O. Schneider and C. Schwanda and Schwartz, {A. J.} and R. Seidl and K. Senyo and Sevior, {M. E.} and M. Shapkin and H. Shibuya and B. Shwartz and V. Sidorov and Singh, {J. B.} and A. Sokolov and A. Somov and S. Stani{\v c} and M. Stari{\v c} and H. Stoeck and K. Sumisawa and T. Sumiyoshi and S. Suzuki and Suzuki, {S. Y.} and F. Takasaki and K. Tamai and N. Tamura and M. Tanaka and Taylor, {G. N.} and Y. Teramoto and Tian, {X. C.} and K. Trabelsi and T. Tsukamoto and S. Uehara and T. Uglov and K. Ueno and Y. Unno and S. Uno and P. Urquijo and Y. Usov and G. Varner and S. Villa and Wang, {C. C.} and Wang, {C. H.} and Y. Watanabe and J. Wiechczynski and E. Won and Xie, {Q. L.} and Yabsley, {B. D.} and A. Yamaguchi and Y. Yamashita and M. Yamauchi and Y. Yusa and Zhang, {L. M.} and Zhang, {Z. P.} and V. Zhilich and A. Zupanc",

year = "2007",

doi = "10.1103/PhysRevLett.98.052001",

language = "English",

volume = "98",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "5",

}

TY - JOUR

T1 - Measurement of inclusive Ds, D0, and J/ψ rates and determination of the Bs(*)B̄s(*) production fraction in bb̄ events at the Υ(5S) resonance

AU - Drutskoy, A.

AU - Abe, K.

AU - Adachi, I.

AU - Aihara, H.

AU - Anipko, D.

AU - Arinstein, K.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Banerjee, S.

AU - Barberio, E.

AU - Barbero, M.

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 - 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, Y.

AU - Choi, Y. K.

AU - Chuvikov, A.

AU - Cole, S.

AU - Dalseno, J.

AU - Danilov, M.

AU - Dash, M.

AU - Dragic, J.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Fratina, S.

AU - Gabyshev, N.

AU - Gershon, T.

AU - Go, A.

AU - Gokhroo, G.

AU - Goldenzweig, P.

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 - Higuchi, T.

AU - Hoshi, Y.

AU - Hou, S.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Iijima, T.

AU - Imoto, A.

AU - Inami, K.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kang, J. H.

AU - Katayama, N.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Khan, H. R.

AU - Kichimi, H.

AU - Kim, S. K.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Korpar, S.

AU - Križan, P.

AU - Krokovny, P.

AU - Kulasiri, R.

AU - Kumar, R.

AU - Kuo, C. C.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lange, J. S.

AU - Leder, G.

AU - Lee, J.

AU - Lee, M. J.

AU - Lesiak, T.

AU - Li, J.

AU - Limosani, A.

AU - Lin, S. W.

AU - Liventsev, D.

AU - MacNaughton, J.

AU - Majumder, G.

AU - Mandl, F.

AU - Matsumoto, T.

AU - Matyja, A.

AU - McOnie, S.

AU - Mitaroff, W.

AU - Miyabayashi, K.

AU - Miyake, H.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Moloney, G. R.

AU - Nagamine, T.

AU - Nagasaka, Y.

AU - Nakano, E.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nitoh, O.

AU - Nozaki, T.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, H.

AU - Park, K. S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Poluektov, A.

AU - Sakai, Y.

AU - Satoyama, N.

AU - Schietinger, T.

AU - Schneider, O.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Seidl, R.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shibuya, H.

AU - Shwartz, B.

AU - Sidorov, V.

AU - Singh, J. B.

AU - Sokolov, A.

AU - Somov, A.

AU - Stanič, S.

AU - Starič, M.

AU - Stoeck, H.

AU - Sumisawa, K.

AU - Sumiyoshi, T.

AU - Suzuki, S.

AU - Suzuki, S. Y.

AU - Takasaki, F.

AU - Tamai, K.

AU - Tamura, N.

AU - Tanaka, M.

AU - Taylor, G. N.

AU - Teramoto, Y.

AU - Tian, X. C.

AU - Trabelsi, K.

AU - Tsukamoto, T.

AU - Uehara, S.

AU - Uglov, T.

AU - Ueno, K.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Usov, Y.

AU - Varner, G.

AU - Villa, S.

AU - Wang, C. C.

AU - Wang, C. H.

AU - Watanabe, Y.

AU - Wiechczynski, J.

AU - Won, E.

AU - Xie, Q. L.

AU - Yabsley, B. D.

AU - Yamaguchi, A.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Yusa, Y.

AU - Zhang, L. M.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zupanc, A.

PY - 2007

Y1 - 2007

N2 - The inclusive production of Ds, D0, and J/ψ mesons is studied using a 1.86fb-1 data sample collected on the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The number of bb̄ events in this Υ(5S) data sample is determined. We measure the branching fractions B(Υ(5S)→DsX)/2=(23.6±1.2±3.6)%, B(Υ(5S)→D0X)/2=(53.8±2.0±3.4)%, and B(Υ(5S)→J/ ψX)/2=(1.030±0.080±0.067)%. From the Ds and D0 inclusive branching fractions the ratio fs=(18.0±1.3±3.2)% of Bs(*)B̄s(*) to the total bb̄ quark pair production at the Υ(5S) energy is obtained in a model-dependent way.

AB - The inclusive production of Ds, D0, and J/ψ mesons is studied using a 1.86fb-1 data sample collected on the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The number of bb̄ events in this Υ(5S) data sample is determined. We measure the branching fractions B(Υ(5S)→DsX)/2=(23.6±1.2±3.6)%, B(Υ(5S)→D0X)/2=(53.8±2.0±3.4)%, and B(Υ(5S)→J/ ψX)/2=(1.030±0.080±0.067)%. From the Ds and D0 inclusive branching fractions the ratio fs=(18.0±1.3±3.2)% of Bs(*)B̄s(*) to the total bb̄ quark pair production at the Υ(5S) energy is obtained in a model-dependent way.

UR - http://www.scopus.com/inward/record.url?scp=33846637382&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.98.052001

DO - 10.1103/PhysRevLett.98.052001

M3 - Article

AN - SCOPUS:33846637382

SN - 0031-9007

VL - 98

JO - Physical review letters

JF - Physical review letters

IS - 5

M1 - 052001

ER -

Measurement of inclusive Ds, D0, and J/ψ rates and determination of the Bs()B̄s() production fraction in bb̄ events at the Υ(5S) resonance

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