Measurement of the direct photon momentum spectrum in Υ(1S), Υ(2S), and Υ(3S) decays

D. Besson; S. Henderson; T. K. Pedlar; D. Cronin-Hennessy; K. Y. Gao; D. T. Gong; J. Hietala; Y. Kubota; T. Klein; B. W. Lang; S. Z. Li; R. Poling; A. W. Scott; A. Smith; S. Dobbs; Z. Metreveli; K. K. Seth; A. Tomaradze; P. Zweber; J. Ernst; K. Arms; H. Severini; D. M. Asner; S. A. Dytman; W. Love; 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; I. P.J. Shipsey; G. S. Adams; M. Cravey; J. P. Cummings; I. Danko; J. Napolitano; Q. He; H. Muramatsu; C. S. Park; E. H. Thorndike; T. E. Coan; Y. S. Gao; F. Liu; R. Stroynowski; M. Artuso; C. Boulahouache; S. Blusk; J. Butt; O. Dorjkhaidav; J. Li; N. Menaa; G. Moneti; R. Mountain; R. Nandakumar; K. Randrianarivony; R. Redjimi; R. Sia; T. Skwarnicki; S. Stone; J. C. Wang; K. Zhang; S. E. Csorna; G. Bonvicini; D. Cinabro; M. Dubrovin; A. Bornheim; S. P. Pappas; A. J. Weinstein; R. A. Briere; G. P. Chen; J. Chen; T. Ferguson; G. Tatishvili; H. Vogel; M. E. Watkins; J. L. Rosner; N. E. Adam; J. P. Alexander; K. Berkelman; D. G. Cassel; V. Crede; 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; 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; E. A. Phillips; J. Pivarski; D. Riley; A. Ryd; A. J. Sadoff; H. Schwarthoff; X. Shi; M. R. Shepherd; S. Stroiney; W. M. Sun; D. Urner; T. Wilksen; K. M. Weaver; M. Weinberger; S. B. Athar; P. Avery; L. Breva-Newell; R. Patel; V. Potlia; H. Stoeck; J. Yelton; P. Rubin; C. Cawlfield; B. I. Eisenstein; G. D. Gollin; I. Karliner; D. Kim; N. Lowrey; P. Naik; C. Sedlack; M. Selen; E. J. White; J. Williams; J. Wiss; K. W. Edwards

doi:10.1103/PhysRevD.74.012003

Measurement of the direct photon momentum spectrum in Υ(1S), Υ(2S), and Υ(3S) decays

D. Besson, S. Henderson, T. K. Pedlar, D. Cronin-Hennessy, K. Y. Gao, D. T. Gong, J. Hietala, Y. Kubota, T. Klein, B. W. Lang, S. Z. Li, R. Poling, A. W. Scott, A. Smith, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, P. Zweber, J. ErnstK. Arms, H. Severini, D. M. Asner, S. A. Dytman, W. Love, 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, I. P.J. Shipsey, G. S. Adams, M. Cravey, J. P. Cummings, I. Danko, J. Napolitano, Q. He, H. Muramatsu, C. S. Park, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, R. Stroynowski, M. Artuso, C. Boulahouache, S. Blusk, J. Butt, O. Dorjkhaidav, J. Li, N. Menaa, G. Moneti, R. Mountain, R. Nandakumar, K. Randrianarivony, R. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, K. Zhang, S. E. Csorna, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Bornheim, S. P. Pappas, A. J. Weinstein, R. A. Briere, G. P. Chen, J. Chen, T. Ferguson, G. Tatishvili, H. Vogel, M. E. Watkins, J. L. Rosner, N. E. Adam, J. P. Alexander, K. Berkelman, D. G. Cassel, V. Crede, 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, 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, E. A. Phillips, J. Pivarski, D. Riley, A. Ryd, A. J. Sadoff, H. Schwarthoff, X. Shi, M. R. Shepherd, S. Stroiney, W. M. Sun, D. Urner, T. Wilksen, K. M. Weaver, M. Weinberger, S. B. Athar, P. Avery, L. Breva-Newell, R. Patel, V. Potlia, H. Stoeck, J. Yelton, P. Rubin, C. Cawlfield, B. I. Eisenstein, G. D. Gollin, I. Karliner, D. Kim, N. Lowrey, P. Naik, C. Sedlack, M. Selen, E. J. White, J. Williams, J. Wiss, K. W. Edwards

Department of Physics

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35 Scopus citations

Abstract

Using data taken with the CLEO III detector at the Cornell Electron Storage Ring, we have investigated the direct photon spectrum in the decays Υ(1S)→γgg, Υ(2S)→γgg, Υ(3S)→γgg. The latter two of these are first measurements. Our analysis procedures differ from previous ones in the following ways: (a) background estimates (primarily from π0 decays) are based on isospin symmetry rather than a determination of the π0 spectrum, which permits measurement of the Υ(2S) and Υ(3S) direct photon spectra without explicit corrections for π0 backgrounds from, e.g., χbJ states, (b) we estimate the branching fractions with a parametrized functional form (exponential) used for the background, and c) we use the high-statistics sample of Υ(2S)→ππΥ(1S) to obtain a tagged sample of Υ(1S)→γ+X events, for which there are no QED backgrounds. We determine values for the ratio of the inclusive direct photon decay rate to that of the dominant three-gluon decay Υ→ggg(Rγ= B(ggγ)/B(ggg)) to be Rγ(1S)=(2.70±0.01±0.13±0. 24)%, Rγ(2S)=(3.18±0.04±0.22±0.41)%, and Rγ(3S)=(2.72±0.06±0.32±0.37)%, where the errors shown are statistical, systematic, and theoretical model dependent, respectively. Given a value of Q2, one can estimate a value for the strong coupling constant αs(Q2) from Rγ.

Original language	English (US)
Article number	012003
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	74
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.74.012003
State	Published - 2006

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.74.012003

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Besson, D., Henderson, S., Pedlar, T. K., Cronin-Hennessy, D., Gao, K. Y., Gong, D. T., Hietala, J., Kubota, Y., Klein, T., Lang, B. W., Li, S. Z., Poling, R., Scott, A. W., Smith, A., Dobbs, S., Metreveli, Z., Seth, K. K., Tomaradze, A., Zweber, P., ... Edwards, K. W. (2006). Measurement of the direct photon momentum spectrum in Υ(1S), Υ(2S), and Υ(3S) decays. Physical Review D - Particles, Fields, Gravitation and Cosmology, 74(1), Article 012003. https://doi.org/10.1103/PhysRevD.74.012003

Besson, D, Henderson, S, Pedlar, TK, Cronin-Hennessy, D, Gao, KY, Gong, DT, Hietala, J, Kubota, Y, Klein, T, Lang, BW, Li, SZ, Poling, R, Scott, AW, Smith, A, Dobbs, S, Metreveli, Z, Seth, KK, Tomaradze, A, Zweber, P, Ernst, J, Arms, K, Severini, H, Asner, DM, Dytman, SA, Love, W, Mehrabyan, S, Mueller, JA, Savinov, V, Li, Z, Lopez, A, Mendez, H, Ramirez, J, Huang, GS, Miller, DH, Pavlunin, V, Sanghi, B, Shipsey, IPJ, Adams, GS, Cravey, M, Cummings, JP, Danko, I, Napolitano, J, He, Q, Muramatsu, H, Park, CS, Thorndike, EH, Coan, TE, Gao, YS, Liu, F, Stroynowski, R, Artuso, M, Boulahouache, C, Blusk, S, Butt, J, Dorjkhaidav, O, Li, J, Menaa, N, Moneti, G, Mountain, R, Nandakumar, R, Randrianarivony, K, Redjimi, R, Sia, R, Skwarnicki, T, Stone, S, Wang, JC, Zhang, K, Csorna, SE, Bonvicini, G, Cinabro, D, Dubrovin, M, Bornheim, A, Pappas, SP, Weinstein, AJ, Briere, RA, Chen, GP, Chen, J, Ferguson, T, Tatishvili, G, Vogel, H, Watkins, ME, Rosner, JL, Adam, NE, Alexander, JP, Berkelman, K, Cassel, DG, Crede, V, Duboscq, JE, Ecklund, KM, Ehrlich, R, Fields, L, Galik, RS, Gibbons, L, Gittelman, B, Gray, R, Gray, SW, Hartill, DL, Heltsley, BK, Hertz, D, Jones, CD, Kandaswamy, J, Kreinick, DL, Kuznetsov, VE, Mahlke-Krüger, H, Meyer, TO, Onyisi, PUE, Patterson, JR, Peterson, D, Phillips, EA, Pivarski, J, Riley, D, Ryd, A, Sadoff, AJ, Schwarthoff, H, Shi, X, Shepherd, MR, Stroiney, S, Sun, WM, Urner, D, Wilksen, T, Weaver, KM, Weinberger, M, Athar, SB, Avery, P, Breva-Newell, L, Patel, R, Potlia, V, Stoeck, H, Yelton, J, Rubin, P, Cawlfield, C, Eisenstein, BI, Gollin, GD, Karliner, I, Kim, D, Lowrey, N, Naik, P, Sedlack, C, Selen, M, White, EJ, Williams, J, Wiss, J & Edwards, KW 2006, 'Measurement of the direct photon momentum spectrum in Υ(1S), Υ(2S), and Υ(3S) decays', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 74, no. 1, 012003. https://doi.org/10.1103/PhysRevD.74.012003

@article{c8d72d0967b24a519c982ea6be0c1ea3,

title = "Measurement of the direct photon momentum spectrum in Υ(1S), Υ(2S), and Υ(3S) decays",

abstract = "Using data taken with the CLEO III detector at the Cornell Electron Storage Ring, we have investigated the direct photon spectrum in the decays Υ(1S)→γgg, Υ(2S)→γgg, Υ(3S)→γgg. The latter two of these are first measurements. Our analysis procedures differ from previous ones in the following ways: (a) background estimates (primarily from π0 decays) are based on isospin symmetry rather than a determination of the π0 spectrum, which permits measurement of the Υ(2S) and Υ(3S) direct photon spectra without explicit corrections for π0 backgrounds from, e.g., χbJ states, (b) we estimate the branching fractions with a parametrized functional form (exponential) used for the background, and c) we use the high-statistics sample of Υ(2S)→ππΥ(1S) to obtain a tagged sample of Υ(1S)→γ+X events, for which there are no QED backgrounds. We determine values for the ratio of the inclusive direct photon decay rate to that of the dominant three-gluon decay Υ→ggg(Rγ= B(ggγ)/B(ggg)) to be Rγ(1S)=(2.70±0.01±0.13±0. 24)%, Rγ(2S)=(3.18±0.04±0.22±0.41)%, and Rγ(3S)=(2.72±0.06±0.32±0.37)%, where the errors shown are statistical, systematic, and theoretical model dependent, respectively. Given a value of Q2, one can estimate a value for the strong coupling constant αs(Q2) from Rγ.",

author = "D. Besson and S. Henderson and Pedlar, {T. K.} and D. Cronin-Hennessy and Gao, {K. Y.} and Gong, {D. T.} and J. Hietala and Y. Kubota and T. Klein and Lang, {B. W.} and Li, {S. Z.} and R. Poling and Scott, {A. W.} and A. Smith and S. Dobbs and Z. Metreveli and Seth, {K. K.} and A. Tomaradze and P. Zweber and J. Ernst and K. Arms and H. Severini and Asner, {D. M.} and Dytman, {S. A.} and W. Love 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 Shipsey, {I. P.J.} and Adams, {G. S.} and M. Cravey and Cummings, {J. P.} and I. Danko and J. Napolitano and Q. He and H. Muramatsu and Park, {C. S.} 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 O. Dorjkhaidav and J. Li and N. Menaa and G. Moneti and R. Mountain and R. Nandakumar and K. Randrianarivony and R. Redjimi and R. Sia and T. Skwarnicki and S. Stone and Wang, {J. C.} and K. Zhang and Csorna, {S. E.} and G. Bonvicini and D. Cinabro and M. Dubrovin and A. Bornheim and Pappas, {S. P.} and Weinstein, {A. J.} and Briere, {R. A.} and Chen, {G. P.} and J. Chen and T. Ferguson and G. Tatishvili and H. Vogel and Watkins, {M. E.} and Rosner, {J. L.} and Adam, {N. E.} and Alexander, {J. P.} and K. Berkelman and Cassel, {D. G.} and V. Crede 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 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 Phillips, {E. A.} and J. Pivarski and D. Riley and A. Ryd and Sadoff, {A. J.} and H. Schwarthoff and X. Shi and Shepherd, {M. R.} and S. Stroiney and Sun, {W. M.} and D. Urner and T. Wilksen and Weaver, {K. M.} 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 C. Cawlfield 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 White, {E. J.} and J. Williams and J. Wiss and Edwards, {K. W.}",

year = "2006",

doi = "10.1103/PhysRevD.74.012003",

language = "English (US)",

volume = "74",

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

issn = "1550-7998",

publisher = "American Physical Society",

number = "1",

}

TY - JOUR

T1 - Measurement of the direct photon momentum spectrum in Υ(1S), Υ(2S), and Υ(3S) decays

AU - Besson, D.

AU - Henderson, S.

AU - Pedlar, T. K.

AU - Cronin-Hennessy, D.

AU - Gao, K. Y.

AU - Gong, D. T.

AU - Hietala, J.

AU - Kubota, Y.

AU - Klein, T.

AU - Lang, B. W.

AU - Li, S. Z.

AU - Poling, R.

AU - Scott, A. W.

AU - Smith, A.

AU - Dobbs, S.

AU - Metreveli, Z.

AU - Seth, K. K.

AU - Tomaradze, A.

AU - Zweber, P.

AU - Ernst, J.

AU - Arms, K.

AU - Severini, H.

AU - Asner, D. M.

AU - Dytman, S. A.

AU - Love, W.

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 - Shipsey, I. P.J.

AU - Adams, G. S.

AU - Cravey, M.

AU - Cummings, J. P.

AU - Danko, I.

AU - Napolitano, J.

AU - He, Q.

AU - Muramatsu, H.

AU - Park, C. S.

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 - Dorjkhaidav, O.

AU - Li, J.

AU - Menaa, N.

AU - Moneti, G.

AU - Mountain, R.

AU - Nandakumar, R.

AU - Randrianarivony, K.

AU - Redjimi, R.

AU - Sia, R.

AU - Skwarnicki, T.

AU - Stone, S.

AU - Wang, J. C.

AU - Zhang, K.

AU - Csorna, S. E.

AU - Bonvicini, G.

AU - Cinabro, D.

AU - Dubrovin, M.

AU - Bornheim, A.

AU - Pappas, S. P.

AU - Weinstein, A. J.

AU - Briere, R. A.

AU - Chen, G. P.

AU - Chen, J.

AU - Ferguson, T.

AU - Tatishvili, G.

AU - Vogel, H.

AU - Watkins, M. E.

AU - Rosner, J. L.

AU - Adam, N. E.

AU - Alexander, J. P.

AU - Berkelman, K.

AU - Cassel, D. G.

AU - Crede, V.

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 - 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 - Phillips, E. A.

AU - Pivarski, J.

AU - Riley, D.

AU - Ryd, A.

AU - Sadoff, A. J.

AU - Schwarthoff, H.

AU - Shi, X.

AU - Shepherd, M. R.

AU - Stroiney, S.

AU - Sun, W. M.

AU - Urner, D.

AU - Wilksen, T.

AU - Weaver, K. M.

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 - Cawlfield, C.

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 - White, E. J.

AU - Williams, J.

AU - Wiss, J.

AU - Edwards, K. W.

PY - 2006

Y1 - 2006

N2 - Using data taken with the CLEO III detector at the Cornell Electron Storage Ring, we have investigated the direct photon spectrum in the decays Υ(1S)→γgg, Υ(2S)→γgg, Υ(3S)→γgg. The latter two of these are first measurements. Our analysis procedures differ from previous ones in the following ways: (a) background estimates (primarily from π0 decays) are based on isospin symmetry rather than a determination of the π0 spectrum, which permits measurement of the Υ(2S) and Υ(3S) direct photon spectra without explicit corrections for π0 backgrounds from, e.g., χbJ states, (b) we estimate the branching fractions with a parametrized functional form (exponential) used for the background, and c) we use the high-statistics sample of Υ(2S)→ππΥ(1S) to obtain a tagged sample of Υ(1S)→γ+X events, for which there are no QED backgrounds. We determine values for the ratio of the inclusive direct photon decay rate to that of the dominant three-gluon decay Υ→ggg(Rγ= B(ggγ)/B(ggg)) to be Rγ(1S)=(2.70±0.01±0.13±0. 24)%, Rγ(2S)=(3.18±0.04±0.22±0.41)%, and Rγ(3S)=(2.72±0.06±0.32±0.37)%, where the errors shown are statistical, systematic, and theoretical model dependent, respectively. Given a value of Q2, one can estimate a value for the strong coupling constant αs(Q2) from Rγ.

AB - Using data taken with the CLEO III detector at the Cornell Electron Storage Ring, we have investigated the direct photon spectrum in the decays Υ(1S)→γgg, Υ(2S)→γgg, Υ(3S)→γgg. The latter two of these are first measurements. Our analysis procedures differ from previous ones in the following ways: (a) background estimates (primarily from π0 decays) are based on isospin symmetry rather than a determination of the π0 spectrum, which permits measurement of the Υ(2S) and Υ(3S) direct photon spectra without explicit corrections for π0 backgrounds from, e.g., χbJ states, (b) we estimate the branching fractions with a parametrized functional form (exponential) used for the background, and c) we use the high-statistics sample of Υ(2S)→ππΥ(1S) to obtain a tagged sample of Υ(1S)→γ+X events, for which there are no QED backgrounds. We determine values for the ratio of the inclusive direct photon decay rate to that of the dominant three-gluon decay Υ→ggg(Rγ= B(ggγ)/B(ggg)) to be Rγ(1S)=(2.70±0.01±0.13±0. 24)%, Rγ(2S)=(3.18±0.04±0.22±0.41)%, and Rγ(3S)=(2.72±0.06±0.32±0.37)%, where the errors shown are statistical, systematic, and theoretical model dependent, respectively. Given a value of Q2, one can estimate a value for the strong coupling constant αs(Q2) from Rγ.

UR - http://www.scopus.com/inward/record.url?scp=33745961122&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745961122&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.74.012003

DO - 10.1103/PhysRevD.74.012003

M3 - Article

AN - SCOPUS:33745961122

SN - 1550-7998

VL - 74

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

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

IS - 1

M1 - 012003

ER -

Measurement of the direct photon momentum spectrum in Υ(1S), Υ(2S), and Υ(3S) decays

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