New measurements of Y(1S) decays to charmonium final states

R. A. Briere; G. P. Chen; T. Ferguson; G. Tatishvili; H. Vogel; M. E. Watkins; N. E. Adam; J. P. Alexander; K. Berkelman; D. G. Cassel; J. E. Duboscq; K. M. Ecklund; R. Ehrlich; L. Fields; R. S. Galik; L. Gibbons; B. Gittelman; R. Gray; S. W. Gray; D. L. Hartill; B. K. Heltsley; D. Hertz; L. Hsu; C. D. Jones; J. Kandaswamy; D. L. Kreinick; V. E. Kuznetsov; H. Mahlke-Krüger; T. O. Meyer; P. U.E. Onyisi; J. R. Patterson; D. Peterson; J. Pivarski; D. Riley; J. L. Rosner; A. Ryd; A. J. Sadoff; H. Schwarthoff; M. R. Shepherd; W. M. Sun; J. G. Thayer; D. Urner; T. Wilksen; M. Weinberger; S. B. Athar; P. Avery; L. Breva-Newell; R. Patel; V. Potlia; H. Stoeck; J. Yelton; P. Rubin; B. I. Eisenstein; G. D. Gollin; I. Karliner; D. Kim; N. Lowrey; P. Naik; C. Sedlack; M. Selen; J. J. Thaler; J. Williams; J. Wiss; K. W. Edwards; D. Besson; K. Y. Gao; D. T. Gong; Y. Kubota; S. Z. Li; R. Poling; A. W. Scott; A. Smith; C. J. Stepaniak; J. Urheim; Z. Metreveli; K. K. Seth; A. Tomaradze; P. Zweber; J. Ernst; K. Arms; K. K. Gan; H. Severini; P. Skubic; D. M. Asner; S. A. Dytman; S. Mehrabyan; J. A. Mueller; V. Savinov; Z. Li; A. Lopez; H. Mendez; J. Ramirez; G. S. Huang; D. H. Miller; V. Pavlunin; B. Sanghi; E. I. Shibata; I. P.J. Shipsey; G. S. Adams; M. Chasse; J. P. Cummings; I. Danko; J. Napolitano; D. Cronin-Hennessy; C. S. Park; W. Park; J. B. Thayer; E. H. Thorndike; T. E. Coan; Y. S. Gao; F. Liu; R. Stroynowski; M. Artuso; C. Boulahouache; S. Blusk; J. Butt; E. Dambasuren; O. Dorjkhaidav; N. Menaa; R. Mountain; H. Muramatsu; R. Nandakumar; R. Redjimi; R. Sia; T. Skwarnicki; S. Stone; J. C. Wang; K. Zhang; A. H. Mahmood; S. E. Csorna; G. Bonvicini; D. Cinabro; M. Dubrovin; A. Bornheim; E. Lipeles; S. P. Pappas; A. J. Weinstein

doi:10.1103/PhysRevD.70.072001

New measurements of Y(1S) decays to charmonium final states

R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, H. Vogel, M. E. Watkins, N. E. Adam, J. P. Alexander, K. Berkelman, D. G. Cassel, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, L. Fields, R. S. Galik, L. Gibbons, B. Gittelman, R. Gray, S. W. Gray, D. L. HartillB. K. Heltsley, D. Hertz, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, H. Mahlke-Krüger, T. O. Meyer, P. U.E. Onyisi, J. R. Patterson, D. Peterson, J. Pivarski, D. Riley, J. L. Rosner, A. Ryd, A. J. Sadoff, H. Schwarthoff, M. R. Shepherd, W. M. Sun, J. G. Thayer, D. Urner, T. Wilksen, M. Weinberger, S. B. Athar, P. Avery, L. Breva-Newell, R. Patel, V. Potlia, H. Stoeck, J. Yelton, P. Rubin, B. I. Eisenstein, G. D. Gollin, I. Karliner, D. Kim, N. Lowrey, P. Naik, C. Sedlack, M. Selen, J. J. Thaler, J. Williams, J. Wiss, K. W. Edwards, D. Besson, K. Y. Gao, D. T. Gong, Y. Kubota, S. Z. Li, R. Poling, A. W. Scott, A. Smith, C. J. Stepaniak, J. Urheim, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, J. Ernst, K. Arms, K. K. Gan, H. Severini, P. Skubic, D. M. Asner, S. A. Dytman, S. Mehrabyan, J. A. Mueller, V. Savinov, Z. Li, A. Lopez, H. Mendez, J. Ramirez, G. S. Huang, D. H. Miller, V. Pavlunin, B. Sanghi, E. I. Shibata, I. P.J. Shipsey, G. S. Adams, M. Chasse, J. P. Cummings, I. Danko, J. Napolitano, D. Cronin-Hennessy, C. S. Park, W. Park, J. B. Thayer, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, R. Stroynowski, M. Artuso, C. Boulahouache, S. Blusk, J. Butt, E. Dambasuren, O. Dorjkhaidav, N. Menaa, R. Mountain, H. Muramatsu, R. Nandakumar, R. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, K. Zhang, A. H. Mahmood, S. E. Csorna, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Bornheim, E. Lipeles, S. P. Pappas, A. J. Weinstein

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

30 Scopus citations

Abstract

Using data collected by the CLEO III detector at CESR, we report on measurements of Y(1S) decays to charmonium final states. The data sample used for this analysis consists of 21.2 × 10⁶ Y(1S) decays, representing about 35 times more data than previous CLEO Y(1S) data samples. We present substantially improved measurements of the branching fraction B(Y(1S) → J/ψ + X) using J/ψ → μ⁺ μ^- and J/ψ → e⁺ e^- decays. The branching fractions for these two modes are averaged, thereby obtaining: B(Y(1S) → J/ψ + X) = (6.4 ± 0.4(stat) ± 0.6(syst)) × 10^-4. A greatly improved measurement of the J/ø momentum distribution is presented and indicates a spectrum which is much softer than predicted by the color-octet model and somewhat softer than the color-singlet model. First measurements of the J/ψ polarization and production angle are also presented. In addition, we report on the first observation of Y(1S) → ψA(2S) + X and evidence for Y(1S) → χ_cJ + X. Their branching fractions are measured relative to B(Y(1S) → J/ψ + X) and are found to be {[B(Y(1S) → ψ(2S) + X)]/[B(Y(1S) → J/ψ + X)]} = 0.41 ± 0.11(stat) ± 0.08(syst), {[B(Y(1S) → χ_c1 + X)]/[B(Y(1S) → J/ψ + X)]} = 0.35 ± 0.08(stat) ± 0.06(syst), {[B(Y(1S) → χ_c2 + X)]/[B(Y(1S) → J/ψ + X)]} = 0.52 ± 0.12(stat) ± 0.09(syst), and {[B(Y(1S) → χ_c0 + X)]/[B(Y(1S) → J/ψ + X)]} < 7.4 at 90% confidence level. The resulting feed-down contributions to J/ψ are [24 ± 6(stat) ± 5(syst)]% for ψ(2S), [11 ± 3(stat) ± 2(syst)]% for χ_c1, [10 ± 2(stat) ± 2(syst)]% for χ_c2, and <8.2% at 90% confidence level for ψ_c0. These measurements (apart from χ_c0) are about a factor of 2 larger than expected based on the coloroctet model.

Original language	English (US)
Article number	072001
Pages (from-to)	072001-1-072001-18
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	70
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.70.072001
State	Published - Oct 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1103/PhysRevD.70.072001

Cite this

Briere, R. A., Chen, G. P., Ferguson, T., Tatishvili, G., Vogel, H., Watkins, M. E., Adam, N. E., Alexander, J. P., Berkelman, K., Cassel, D. G., Duboscq, J. E., Ecklund, K. M., Ehrlich, R., Fields, L., Galik, R. S., Gibbons, L., Gittelman, B., Gray, R., Gray, S. W., ... Weinstein, A. J. (2004). New measurements of Y(1S) decays to charmonium final states. Physical Review D - Particles, Fields, Gravitation and Cosmology, 70(7), 072001-1-072001-18. Article 072001. https://doi.org/10.1103/PhysRevD.70.072001

@article{b9b2b7105125459daaaaa12f5792121d,

title = "New measurements of Y(1S) decays to charmonium final states",

abstract = "Using data collected by the CLEO III detector at CESR, we report on measurements of Y(1S) decays to charmonium final states. The data sample used for this analysis consists of 21.2 × 106 Y(1S) decays, representing about 35 times more data than previous CLEO Y(1S) data samples. We present substantially improved measurements of the branching fraction B(Y(1S) → J/ψ + X) using J/ψ → μ+ μ- and J/ψ → e+ e- decays. The branching fractions for these two modes are averaged, thereby obtaining: B(Y(1S) → J/ψ + X) = (6.4 ± 0.4(stat) ± 0.6(syst)) × 10-4. A greatly improved measurement of the J/{\o} momentum distribution is presented and indicates a spectrum which is much softer than predicted by the color-octet model and somewhat softer than the color-singlet model. First measurements of the J/ψ polarization and production angle are also presented. In addition, we report on the first observation of Y(1S) → ψA(2S) + X and evidence for Y(1S) → χcJ + X. Their branching fractions are measured relative to B(Y(1S) → J/ψ + X) and are found to be {[B(Y(1S) → ψ(2S) + X)]/[B(Y(1S) → J/ψ + X)]} = 0.41 ± 0.11(stat) ± 0.08(syst), {[B(Y(1S) → χc1 + X)]/[B(Y(1S) → J/ψ + X)]} = 0.35 ± 0.08(stat) ± 0.06(syst), {[B(Y(1S) → χc2 + X)]/[B(Y(1S) → J/ψ + X)]} = 0.52 ± 0.12(stat) ± 0.09(syst), and {[B(Y(1S) → χc0 + X)]/[B(Y(1S) → J/ψ + X)]} < 7.4 at 90% confidence level. The resulting feed-down contributions to J/ψ are [24 ± 6(stat) ± 5(syst)]% for ψ(2S), [11 ± 3(stat) ± 2(syst)]% for χc1, [10 ± 2(stat) ± 2(syst)]% for χc2, and <8.2% at 90% confidence level for ψc0. These measurements (apart from χc0) are about a factor of 2 larger than expected based on the coloroctet model.",

author = "Briere, {R. A.} and Chen, {G. P.} and T. Ferguson and G. Tatishvili and H. Vogel and Watkins, {M. E.} and Adam, {N. E.} and Alexander, {J. P.} and K. Berkelman and Cassel, {D. G.} and Duboscq, {J. E.} and Ecklund, {K. M.} and R. Ehrlich and L. Fields and Galik, {R. S.} and L. Gibbons and B. Gittelman and R. Gray and Gray, {S. W.} and Hartill, {D. L.} and Heltsley, {B. K.} and D. Hertz and L. Hsu and Jones, {C. D.} and J. Kandaswamy and Kreinick, {D. L.} and Kuznetsov, {V. E.} and H. Mahlke-Kr{\"u}ger and Meyer, {T. O.} and Onyisi, {P. U.E.} and Patterson, {J. R.} and D. Peterson and J. Pivarski and D. Riley and Rosner, {J. L.} and A. Ryd and Sadoff, {A. J.} and H. Schwarthoff and Shepherd, {M. R.} and Sun, {W. M.} and Thayer, {J. G.} and D. Urner and T. Wilksen and M. Weinberger and Athar, {S. B.} and P. Avery and L. Breva-Newell and R. Patel and V. Potlia and H. Stoeck and J. Yelton and P. Rubin and Eisenstein, {B. I.} and Gollin, {G. D.} and I. Karliner and D. Kim and N. Lowrey and P. Naik and C. Sedlack and M. Selen and Thaler, {J. J.} and J. Williams and J. Wiss and Edwards, {K. W.} and D. Besson and Gao, {K. Y.} and Gong, {D. T.} and Y. Kubota and Li, {S. Z.} and R. Poling and Scott, {A. W.} and A. Smith and Stepaniak, {C. J.} and J. Urheim and Z. Metreveli and Seth, {K. K.} and A. Tomaradze and P. Zweber and J. Ernst and K. Arms and Gan, {K. K.} and H. Severini and P. Skubic and Asner, {D. M.} and Dytman, {S. A.} and S. Mehrabyan and Mueller, {J. A.} and V. Savinov and Z. Li and A. Lopez and H. Mendez and J. Ramirez and Huang, {G. S.} and Miller, {D. H.} and V. Pavlunin and B. Sanghi and Shibata, {E. I.} and Shipsey, {I. P.J.} and Adams, {G. S.} and M. Chasse and Cummings, {J. P.} and I. Danko and J. Napolitano and D. Cronin-Hennessy and Park, {C. S.} and W. Park and Thayer, {J. B.} and Thorndike, {E. H.} and Coan, {T. E.} and Gao, {Y. S.} and F. Liu and R. Stroynowski and M. Artuso and C. Boulahouache and S. Blusk and J. Butt and E. Dambasuren and O. Dorjkhaidav and N. Menaa and R. Mountain and H. Muramatsu and R. Nandakumar and R. Redjimi and R. Sia and T. Skwarnicki and S. Stone and Wang, {J. C.} and K. Zhang and Mahmood, {A. H.} and Csorna, {S. E.} and G. Bonvicini and D. Cinabro and M. Dubrovin and A. Bornheim and E. Lipeles and Pappas, {S. P.} and Weinstein, {A. J.}",

note = "Funding Information: We gratefully acknowledge the effort of the CESR staff in providing us with excellent luminosity and running conditions. This work was supported by the National Science Foundation and the U.S. Department of Energy. We also thank Kingman Cheung and Wai-Yee Keung for their assistance with the color-octet predictions and Shi-yuan Li for providing color-singlet predictions.",

year = "2004",

month = oct,

doi = "10.1103/PhysRevD.70.072001",

language = "English (US)",

volume = "70",

pages = "072001--1--072001--18",

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

issn = "0556-2821",

publisher = "American Physical Society",

number = "7",

}

Briere, RA, Chen, GP, Ferguson, T, Tatishvili, G, Vogel, H, Watkins, ME, Adam, NE, Alexander, JP, Berkelman, K, Cassel, DG, Duboscq, JE, Ecklund, KM, Ehrlich, R, Fields, L, Galik, RS, Gibbons, L, Gittelman, B, Gray, R, Gray, SW, Hartill, DL, Heltsley, BK, Hertz, D, Hsu, L, Jones, CD, Kandaswamy, J, Kreinick, DL, Kuznetsov, VE, Mahlke-Krüger, H, Meyer, TO, Onyisi, PUE, Patterson, JR, Peterson, D, Pivarski, J, Riley, D, Rosner, JL, Ryd, A, Sadoff, AJ, Schwarthoff, H, Shepherd, MR, Sun, WM, Thayer, JG, Urner, D, Wilksen, T, Weinberger, M, Athar, SB, Avery, P, Breva-Newell, L, Patel, R, Potlia, V, Stoeck, H, Yelton, J, Rubin, P, Eisenstein, BI, Gollin, GD, Karliner, I, Kim, D, Lowrey, N, Naik, P, Sedlack, C, Selen, M, Thaler, JJ, Williams, J, Wiss, J, Edwards, KW, Besson, D, Gao, KY, Gong, DT, Kubota, Y, Li, SZ, Poling, R, Scott, AW, Smith, A, Stepaniak, CJ, Urheim, J, Metreveli, Z, Seth, KK, Tomaradze, A, Zweber, P, Ernst, J, Arms, K, Gan, KK, Severini, H, Skubic, P, Asner, DM, Dytman, SA, Mehrabyan, S, Mueller, JA, Savinov, V, Li, Z, Lopez, A, Mendez, H, Ramirez, J, Huang, GS, Miller, DH, Pavlunin, V, Sanghi, B, Shibata, EI, Shipsey, IPJ, Adams, GS, Chasse, M, Cummings, JP, Danko, I, Napolitano, J, Cronin-Hennessy, D, Park, CS, Park, W, Thayer, JB, Thorndike, EH, Coan, TE, Gao, YS, Liu, F, Stroynowski, R, Artuso, M, Boulahouache, C, Blusk, S, Butt, J, Dambasuren, E, Dorjkhaidav, O, Menaa, N, Mountain, R, Muramatsu, H, Nandakumar, R, Redjimi, R, Sia, R, Skwarnicki, T, Stone, S, Wang, JC, Zhang, K, Mahmood, AH, Csorna, SE, Bonvicini, G, Cinabro, D, Dubrovin, M, Bornheim, A, Lipeles, E, Pappas, SP & Weinstein, AJ 2004, 'New measurements of Y(1S) decays to charmonium final states', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 70, no. 7, 072001, pp. 072001-1-072001-18. https://doi.org/10.1103/PhysRevD.70.072001

TY - JOUR

T1 - New measurements of Y(1S) decays to charmonium final states

AU - Briere, R. A.

AU - Chen, G. P.

AU - Ferguson, T.

AU - Tatishvili, G.

AU - Vogel, H.

AU - Watkins, M. E.

AU - Adam, N. E.

AU - Alexander, J. P.

AU - Berkelman, K.

AU - Cassel, D. G.

AU - Duboscq, J. E.

AU - Ecklund, K. M.

AU - Ehrlich, R.

AU - Fields, L.

AU - Galik, R. S.

AU - Gibbons, L.

AU - Gittelman, B.

AU - Gray, R.

AU - Gray, S. W.

AU - Hartill, D. L.

AU - Heltsley, B. K.

AU - Hertz, D.

AU - Hsu, L.

AU - Jones, C. D.

AU - Kandaswamy, J.

AU - Kreinick, D. L.

AU - Kuznetsov, V. E.

AU - Mahlke-Krüger, H.

AU - Meyer, T. O.

AU - Onyisi, P. U.E.

AU - Patterson, J. R.

AU - Peterson, D.

AU - Pivarski, J.

AU - Riley, D.

AU - Rosner, J. L.

AU - Ryd, A.

AU - Sadoff, A. J.

AU - Schwarthoff, H.

AU - Shepherd, M. R.

AU - Sun, W. M.

AU - Thayer, J. G.

AU - Urner, D.

AU - Wilksen, T.

AU - Weinberger, M.

AU - Athar, S. B.

AU - Avery, P.

AU - Breva-Newell, L.

AU - Patel, R.

AU - Potlia, V.

AU - Stoeck, H.

AU - Yelton, J.

AU - Rubin, P.

AU - Eisenstein, B. I.

AU - Gollin, G. D.

AU - Karliner, I.

AU - Kim, D.

AU - Lowrey, N.

AU - Naik, P.

AU - Sedlack, C.

AU - Selen, M.

AU - Thaler, J. J.

AU - Williams, J.

AU - Wiss, J.

AU - Edwards, K. W.

AU - Besson, D.

AU - Gao, K. Y.

AU - Gong, D. T.

AU - Kubota, Y.

AU - Li, S. Z.

AU - Poling, R.

AU - Scott, A. W.

AU - Smith, A.

AU - Stepaniak, C. J.

AU - Urheim, J.

AU - Metreveli, Z.

AU - Seth, K. K.

AU - Tomaradze, A.

AU - Zweber, P.

AU - Ernst, J.

AU - Arms, K.

AU - Gan, K. K.

AU - Severini, H.

AU - Skubic, P.

AU - Asner, D. M.

AU - Dytman, S. A.

AU - Mehrabyan, S.

AU - Mueller, J. A.

AU - Savinov, V.

AU - Li, Z.

AU - Lopez, A.

AU - Mendez, H.

AU - Ramirez, J.

AU - Huang, G. S.

AU - Miller, D. H.

AU - Pavlunin, V.

AU - Sanghi, B.

AU - Shibata, E. I.

AU - Shipsey, I. P.J.

AU - Adams, G. S.

AU - Chasse, M.

AU - Cummings, J. P.

AU - Danko, I.

AU - Napolitano, J.

AU - Cronin-Hennessy, D.

AU - Park, C. S.

AU - Park, W.

AU - Thayer, J. B.

AU - Thorndike, E. H.

AU - Coan, T. E.

AU - Gao, Y. S.

AU - Liu, F.

AU - Stroynowski, R.

AU - Artuso, M.

AU - Boulahouache, C.

AU - Blusk, S.

AU - Butt, J.

AU - Dambasuren, E.

AU - Dorjkhaidav, O.

AU - Menaa, N.

AU - Mountain, R.

AU - Muramatsu, H.

AU - Nandakumar, R.

AU - Redjimi, R.

AU - Sia, R.

AU - Skwarnicki, T.

AU - Stone, S.

AU - Wang, J. C.

AU - Zhang, K.

AU - Mahmood, A. H.

AU - Csorna, S. E.

AU - Bonvicini, G.

AU - Cinabro, D.

AU - Dubrovin, M.

AU - Bornheim, A.

AU - Lipeles, E.

AU - Pappas, S. P.

AU - Weinstein, A. J.

N1 - Funding Information: We gratefully acknowledge the effort of the CESR staff in providing us with excellent luminosity and running conditions. This work was supported by the National Science Foundation and the U.S. Department of Energy. We also thank Kingman Cheung and Wai-Yee Keung for their assistance with the color-octet predictions and Shi-yuan Li for providing color-singlet predictions.

PY - 2004/10

Y1 - 2004/10

N2 - Using data collected by the CLEO III detector at CESR, we report on measurements of Y(1S) decays to charmonium final states. The data sample used for this analysis consists of 21.2 × 106 Y(1S) decays, representing about 35 times more data than previous CLEO Y(1S) data samples. We present substantially improved measurements of the branching fraction B(Y(1S) → J/ψ + X) using J/ψ → μ+ μ- and J/ψ → e+ e- decays. The branching fractions for these two modes are averaged, thereby obtaining: B(Y(1S) → J/ψ + X) = (6.4 ± 0.4(stat) ± 0.6(syst)) × 10-4. A greatly improved measurement of the J/ø momentum distribution is presented and indicates a spectrum which is much softer than predicted by the color-octet model and somewhat softer than the color-singlet model. First measurements of the J/ψ polarization and production angle are also presented. In addition, we report on the first observation of Y(1S) → ψA(2S) + X and evidence for Y(1S) → χcJ + X. Their branching fractions are measured relative to B(Y(1S) → J/ψ + X) and are found to be {[B(Y(1S) → ψ(2S) + X)]/[B(Y(1S) → J/ψ + X)]} = 0.41 ± 0.11(stat) ± 0.08(syst), {[B(Y(1S) → χc1 + X)]/[B(Y(1S) → J/ψ + X)]} = 0.35 ± 0.08(stat) ± 0.06(syst), {[B(Y(1S) → χc2 + X)]/[B(Y(1S) → J/ψ + X)]} = 0.52 ± 0.12(stat) ± 0.09(syst), and {[B(Y(1S) → χc0 + X)]/[B(Y(1S) → J/ψ + X)]} < 7.4 at 90% confidence level. The resulting feed-down contributions to J/ψ are [24 ± 6(stat) ± 5(syst)]% for ψ(2S), [11 ± 3(stat) ± 2(syst)]% for χc1, [10 ± 2(stat) ± 2(syst)]% for χc2, and <8.2% at 90% confidence level for ψc0. These measurements (apart from χc0) are about a factor of 2 larger than expected based on the coloroctet model.

AB - Using data collected by the CLEO III detector at CESR, we report on measurements of Y(1S) decays to charmonium final states. The data sample used for this analysis consists of 21.2 × 106 Y(1S) decays, representing about 35 times more data than previous CLEO Y(1S) data samples. We present substantially improved measurements of the branching fraction B(Y(1S) → J/ψ + X) using J/ψ → μ+ μ- and J/ψ → e+ e- decays. The branching fractions for these two modes are averaged, thereby obtaining: B(Y(1S) → J/ψ + X) = (6.4 ± 0.4(stat) ± 0.6(syst)) × 10-4. A greatly improved measurement of the J/ø momentum distribution is presented and indicates a spectrum which is much softer than predicted by the color-octet model and somewhat softer than the color-singlet model. First measurements of the J/ψ polarization and production angle are also presented. In addition, we report on the first observation of Y(1S) → ψA(2S) + X and evidence for Y(1S) → χcJ + X. Their branching fractions are measured relative to B(Y(1S) → J/ψ + X) and are found to be {[B(Y(1S) → ψ(2S) + X)]/[B(Y(1S) → J/ψ + X)]} = 0.41 ± 0.11(stat) ± 0.08(syst), {[B(Y(1S) → χc1 + X)]/[B(Y(1S) → J/ψ + X)]} = 0.35 ± 0.08(stat) ± 0.06(syst), {[B(Y(1S) → χc2 + X)]/[B(Y(1S) → J/ψ + X)]} = 0.52 ± 0.12(stat) ± 0.09(syst), and {[B(Y(1S) → χc0 + X)]/[B(Y(1S) → J/ψ + X)]} < 7.4 at 90% confidence level. The resulting feed-down contributions to J/ψ are [24 ± 6(stat) ± 5(syst)]% for ψ(2S), [11 ± 3(stat) ± 2(syst)]% for χc1, [10 ± 2(stat) ± 2(syst)]% for χc2, and <8.2% at 90% confidence level for ψc0. These measurements (apart from χc0) are about a factor of 2 larger than expected based on the coloroctet model.

UR - http://www.scopus.com/inward/record.url?scp=80051550176&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80051550176&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.70.072001

DO - 10.1103/PhysRevD.70.072001

M3 - Article

AN - SCOPUS:80051550176

SN - 0556-2821

VL - 70

SP - 072001-1-072001-18

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

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

IS - 7

M1 - 072001

ER -

New measurements of Y(1S) decays to charmonium final states

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