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1. Studies of the Cabibbo-suppressed decays D+ → π0ℓ+v and D+ → ηe+ve

Author

J. Bartelt, S.E. Csorna, V. Jain, S. Marka, A. Freyberger, R. Godang, K. Kinoshita, I.C. Lai, P. Pomianowski, S. Schrenk, G. Bonvicini, D. Cinabro, R. Greene, L.P. Perera, G.J. Zhou, B. Barish, M. Chadha, S. Chan, G. Eigen, J.S. Miller, C. O'Grady, M. Schmidtler, J. Urheim, A.J. Weinstein, F. Würthwein, D.M. Asner, D.W. Bliss, W.S. Brower, G. Masek, H.P. Paar, V. Sharma, J. Gronberg, T.S. Hill, R. Kutschke, D.J. Lange, S. Menary, R.J. Morrison, H.N. Nelson, T.K. Nelson, C. Qiao, J.D. Richman, D. Roberts, A. Ryd, M.S. Witherell, R. Balest, B.H. Behrens, K. Cho, W.T. Ford, H. Park, P. Rankin, J. Roy, J.G. Smith, J.P. Alexander, C. Bebek, B.E. Berger, K. Berkelman, K. Bloom, D.G. Cassel, H.A. Cho, D.M. Coffman, D.S. Crowcroft, M. Dickson, P.S. Drell, K.M. Ecklund, R. Ehrlich, R. Elia, A.D. Foland, P. Gaidarev, B. Gittelman, S.W. Gray, D.L. Hartill, B.K. Heltsley, P.I. Hopman, J. Kandaswamy, N. Katayama, P.C. Kim, D.L. Kreinick, T. Lee, Y. Liu, G.S. Ludwig, J. Masui, J. Mevissen, N.B. Mistry, C.R. Ng, E. Nordberg, M. Ogg, J.R. Patterson, D. Peterson, D. Riley, A. Soffer, C. Ward, M. Athanas, P. Avery, C.D. Jones, M. Lohner, C. Prescott, J. Yelton, J. Zheng, G. Brandenburg, R.A. Briere, Y.S. Gao, D.Y.-J. Kim, R. Wilson, H. Yamamoto, T.E. Browder, F. Li, Y. Li, J.L. Rodriguez, T. Bergfeld, B.I. Eisenstein, J. Ernst, G.E. Gladding, G.D. Gollin, R.M. Hans, E. Johnson, I. Karliner, M.A. Marsh, M. Palmer, M. Selen, J.J. Thaler, K.W. Edwards, A. Bellerive, R. Janicek, D.B. MacFarlane, K.W. McLean, P.M. Patel, A.J. Sadoff, R. Ammar, P. Baringer, A. Bean, D. Besson, D. Coppage, C. Darling, R. Davis, N. Hancock, S. Kotov, I. Kravchenko, N. Kwak, D. Smith, S. Anderson, Y. Kubota, M. Lattery, S.J. Lee, J.J. O'Neill, S. Patton, R. Poling, T. Riehle, V. Savinov, A. Smith, M.S. Alam, S.B. Athar, Z. Ling, A.H. Mahmood, H. Severini, S. Timm, F. Wappler, A. Anastassov, S. Blinov, J.E. Duboscq, K.D. Fisher, D. Fujino, R. Fulton, K.K. Gan, T. Hart, K. Honscheid, H. Kagan, R. Kass, J. Lee, M.B. Spencer, M. Sung, A. Undrus, R. Wanke, A. Wolf, M.M. Zoeller, B. Nemati, S.J. Richichi, W.R. Ross, P. Skubic, M. Wood, M. Bishai, J. Fast, E. Gerndt, J.W. Hinson, N. Menon, D.H. Miller, E.I. Shibata, I.P.J. Shipsey, M. Yurko, L. Gibbons, S.D. Johnson, Y. Kwon, S. Roberts, E.H. Thorndike, C.P. Jessop, K. Lingel, H. Marsiske, M.L. Perl, S.F. Schaffner, D. Ugolini, R. Wang, X. Zhou, T.E. Coan, V. Fadeyev, I. Korolkov, Y. Maravin, I. Narsky, V. Shelkov, J. Staeck, R. Stroynowski, I. Volobouev, J. Ye, M. Artuso, A. Efimov, F. Frasconi, M. Gao, M. Goldberg, D. He, S. Kopp, G.C. Moneti, R. Mountain, S. Schuh, T. Skwarnicki, S. Stone, G. Viehhauser, and X. Xing

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Unitarity, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Pi, 010306 general physics, 01 natural sciences, Bar (unit)
Abstract

Using 4.8 fb$^{-1}$ of data taken with the CLEO II detector, the branching fraction for the Cabibbo-suppressed decay $D^+\to\pi^0\ell^+\nu$ measured relative to the Cabibbo favored decay $D^+\to\bar{K^0}\ell^+\nu$ is found to be $0.046\pm 0.014\pm 0.017$. Using $V_{cs}$ and $V_{cd}$ from unitarity constraints, we determine $| f_+^{\pi}(0)/f_+^K(0)|^2=0.9\pm 0.3\pm 0.3$ We also present a 90% confidence level upper limit for the branching ratio of the decay $D^+ \to \eta e^+\nu_e$ relative to that for $D^+ \to \pi^0 e^+\nu_e$ of 1.5.

Published
2016

2. Observation of the Ξ+ charmed baryon decays to Σ+K−π+, Σ, and ΛK−π+π+

Author

T. Bergfeld, B.I. Eisenstein, J. Ernst, G.E. Gladding, G.D. Gollin, M. Palmer, M. Selen, J.J. Thaler, K.W. Edwards, K.W. McLean, M. Ogg, A. Bellerive, D.I. Britton, E.R.F. Hyatt, R. Janicek, D.B. MacFarlane, P.M. Patel, B. Spaan, A.J. Sadoff, R. Ammar, P. Baringer, A. Bean, D. Besson, D. Coppage, N. Copty, R. Davis, N. Hancock, S. Kotov, I. Kravchenko, N. Kwak, Y. Kubota, M. Lattery, M. Momayezi, J.K. Nelson, S. Patton, R. Poling, V. Savinov, S. Schrenk, R. Wang, M.S. Alam, I.J. Kim, Z. Ling, A.H. Mahmood, J.J. O'Neill, H. Severini, C.R. Sun, F. Wappler, G. Crawford, J.E. Duboscq, R. Fulton, D. Fujino, K.K. Gan, K. Honscheid, H. Kagan, R. Kass, J. Lee, M. Sung, C. White, A. Wolf, M.M. Zoeller, X. Fu, B. Nemati, W.R. Ross, P. Skubic, M. Wood, M. Bishai, J. Fast, E. Gerndt, J.W. Hinson, T. Miao, D.H. Miller, M. Modesitt, E.I. Shibata, I.P.J. Shipsey, P.N. Wang, L. Gibbons, S.D. Johnson, Y. Kwon, S. Roberts, E.H. Thorndike, T.E. Coan, J. Dominick, V. Fadeyev, I. Korolkov, M. Lambrecht, S. Sanghera, V. Shelkov, T. Skwarnicki, R. Stroynowski, I. Volobouev, G. Wei, M. Artuso, M. Gao, M. Goldberg, D. He, N. Horwitz, S. Kopp, G.C. Moneti, R. Mountain, F. Muheim, Y. Mukhin, S. Playfer, S. Stone, X. Xing, J. Bartelt, S.E. Csorna, V. Jain, S. Marka, D. Gibaut, K. Kinoshita, P. Pomianowski, B. Barish, M. Chadha, S. Chan, D.F. Cowen, G. Eigen, J.S. Miller, C. O'Grady, J. Urheim, A.J. Weinstein, F. Würthwein, D.M. Asner, M. Athanas, D.W. Bliss, W.S. Brower, G. Masek, H.P. Paar, J. Gronberg, C.M. Korte, R. Kutschke, S. Menary, R.J. Morrison, S. Nakanishi, H.N. Nelson, T.K. Nelson, C. Qiao, J.D. Richman, D. Roberts, A. Ryd, H. Tajima, M.S. Witherell, R. Balest, K. Cho, W.T. Ford, M. Lohner, H. Park, P. Rankin, J.G. Smith, J.P. Alexander, C. Bebek, B.E. Berger, K. Berkelman, K. Bloom, T.E. Browder, D.G. Cassel, H.A. Cho, D.M. Coffman, D.S. Crowcroft, M. Dickson, P.S. Drell, D.J. Dumas, R. Ehrlich, R. Elia, P. Gaidarev, M. Garcia-Sciveres, B. Gittelman, S.W. Gray, D.L. Hartill, B.K. Heltsley, S. Henderson, C.D. Jones, S.L. Jones, J. Kandaswamy, N. Katayama, P.C. Kim, D.L. Kreinick, T. Lee, Y. Liu, G.S. Ludwig, J. Masui, J. Mevissen, N.B. Mistry, C.R. Ng, E. Nordberg, J.R. Patterson, D. Peterson, D. Riley, A. Soffer, P. Avery, A. Freyberger, K. Lingel, C. Prescott, J. Rodriguez, S. Yang, J. Yelton, G. Brandenburg, D. Cinabro, T. Liu, M. Saulnier, R. Wilson, and H. Yamamoto

Subjects
Baryon, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Pi, Sigma, 010306 general physics, Lambda, 01 natural sciences, Bar (unit)
Abstract

We have observed two new decay modes of the charmed baryon $\Xi_c^+$ into $\Sigma^+ K^-\pi^+$ and $\Sigma^+ \bar{K}^{*0}$ using data collected with the CLEO II detector. We also present the first measurement of the branching fraction for the previously observed decay mode $\Xi_c^+\to\Lambda K^-\pi^+\pi^+$. The branching fractions for these three modes relative to $\Xi_c^+\to\Xi^-\pi^+\pi^+$ are measured to be $1.18 \pm 0.26 \pm 0.17$, $0.92 \pm 0.27 \pm 0.14$, and $0.58 \pm 0.16 \pm 0.07$, respectively.

Published
1996
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3. Measurement of the decay asymmetry parameters in Λ+ → Λπ+ and Λ+ → Σ+π0

Author

M. Bishai, J. Fast, E. Gerndt, J.W. Hinson, R.L. McIlwain, T. Miao, D.H. Miller, M. Modesitt, D. Payne, E.I. Shibata, I.P.J. Shipsey, P.N. Wang, M. Battle, J. Ernst, L. Gibbons, Y. Kwon, S. Roberts, E.H. Thorndike, C.H. Wang, J. Dominick, M. Lambrecht, S. Sanghera, V. Shelkov, T. Skwarnicki, R. Stroynowski, I. Volobouev, G. Wei, M. Artuso, M. Gao, M. Goldberg, D. He, N. Horwitz, G.C. Moneti, R. Mountain, F. Muheim, Y. Mukhin, S. Playfer, Y. Rozen, S. Stone, X. Xing, G. Zhu, J. Bartelt, S.E. Csorna, Z. Egyed, V. Jain, D. Gibaut, K. Kinoshita, P. Pomianowski, B. Barish, M. Chadha, S. Chan, D.F. Cowen, G. Eigen, J.S. Miller, C. O'Grady, J. Urheim, A.J. Weinstein, M. Athanas, W. Brower, G. Masek, H.P. Paar, J. Gronberg, C.M. Korte, R. Kutschke, S. Menary, R.J. Morrison, S. Nakanishi, H.N. Nelson, T.K. Nelson, C. Qiao, J.D. Richman, A. Ryd, D. Sperka, H. Tajima, M.S. Witherell, M. Procario, R. Balest, K. Cho, W.T. Ford, D.R. Johnson, K. Lingel, M. Lohner, P. Rankin, J.G. Smith, J.P. Alexander, C. Bebek, K. Berkelman, K. Bloom, T.E. Browder, D.G. Cassel, H.A. Cho, D.M. Coffman, D.S. Crowcroft, P.S. Drell, D.J. Dumas, R. Ehrlich, P. Gaidarev, M. Garcia-Sciveres, B. Geiser, B. Gittelman, S.W. Gray, D.L. Hartill, B.K. Heltsley, S. Henderson, C.D. Jones, S.L. Jones, J. Kandaswamy, N. Katayama, P.C. Kim, D.L. Kreinick, G.S. Ludwig, J. Masui, J. Mevissen, N.B. Mistry, C.R. Ng, E. Nordberg, J.R. Patterson, D. Peterson, D. Riley, S. Salman, M. Sapper, F. Würthwein, P. Avery, A. Freyberger, J. Rodriguez, S. Yang, J. Yelton, D. Cinabro, T. Liu, M. Saulnier, R. Wilson, H. Yamamoto, T. Bergfeld, B.I. Eisenstein, G. Gollin, B. Ong, M. Palmer, M. Selen, J.J. Thaler, K.W. Edwards, M. Ogg, A. Bellerive, D.I. Britton, E.R.F. Hyatt, D.B. MacFarlane, P.M. Patel, B. Spaan, A.J. Sadoff, R. Ammar, P. Baringer, A. Bean, D. Besson, D. Coppage, N. Copty, R. Davis, N. Hancock, M. Kelly, S. Kotov, I. Kravchenko, N. Kwak, H. Lam, Y. Kubota, M. Lattery, M. Momayezi, J.K. Nelson, S. Patton, R. Poling, V. Savinov, S. Schrenk, R. Wang, M.S. Alam, I.J. Kim, Z. Ling, A.H. Mahmood, J.J. O'Neill, H. Severini, C.R. Sun, F. Wappler, G. Crawford, C.M. Daubenmier, R. Fulton, D. Fujino, K.K. Gan, K. Honscheid, H. Kagan, R. Kass, J. Lee, M. Sung, C. White, A. Wolf, M.M. Zoeller, F. Butler, X. Fu, B. Nemati, W.R. Ross, P. Skubic, and M. Wood

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, High Energy Physics::Phenomenology, Sigma, Astrophysics::Cosmology and Extragalactic Astrophysics, Lambda, Asymmetry, Baryon, Amplitude, Pi, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics, media_common
Abstract

We have measured the weak decay asymmetry parameters ($\aLC $) for two \LC\ decay modes. Our measurements are $\aLC = -0.94^{+0.21+0.12}_{-0.06-0.06} $ for the decay mode $\Lambda_c^+ \to \Lambda\pi^+ $ and $\aLC = -0.45\pm 0.31 \pm 0.06$ for the decay mode $\Lambda_c \to \Sigma^+\pi^0 $. By combining these measurements with the previously measured decay rates, we have extracted the parity-violating and parity-conserving amplitudes. These amplitudes are used to test models of nonleptonic charmed baryon decay.

Published
1995
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4. Measurement of the branching fraction for γ (1S) → τ+τ−

Author

D. Cinabro, T. Liu, M. Saulnier, R. Wilson, H. Yamamoto, T. Bergfeld, B.I. Eisenstein, G. Gollin, B. Ong, M. Palmer, M. Selen, J.J. Thaler, K.W. Edwards, M. Ogg, A. Bellerive, D.I. Britton, E.R.F. Hyatt, D.B. MacFarlane, P.M. Patel, B. Spaan, A.J. Sadoff, R. Ammar, P. Baringer, A. Bean, D. Besson, D. Coppage, N. Copty, R. Davis, N. Hancock, M. Kelly, S. Kotov, I. Kravchenko, N. Kwak, H. Lam, Y. Kubota, M. Lattery, M. Momayezi, J.K. Nelson, S. Patton, R. Poling, V. Savinov, S. Schrenk, R. Wang, M.S. Alam, I.J. Kim, Z. Ling, A.H. Mahmood, J.J. O'Neill, H. Severini, C.R. Sun, F. Wappler, G. Crawford, C.M. Daubenmier, R. Fulton, D. Fujino, K.K. Gan, K. Honscheid, H. Kagan, R. Kass, J. Lee, R. Malchow, M. Sung, C. White, M.M. Zoeller, F. Butler, X. Fu, B. Nemati, W.R. Ross, P. Skubic, M. Wood, M. Bishai, J. Fast, E. Gerndt, J.W. Hinson, R.L. McIlwain, T. Miao, D.H. Miller, M. Modesitt, D. Payne, E.I. Shibata, I.P.J. Shipsey, P.N. Wang, M. Battle, J. Ernst, L. Gibbons, Y. Kwon, S. Roberts, E.H. Thorndike, C.H. Wang, J. Dominick, M. Lambrecht, S. Sanghera, V. Shelkov, T. Skwarnicki, R. Stroynowski, I. Volobouev, G. Wei, P. Zadorozhny, M. Artuso, M. Gao, M. Goldberg, D. He, N. Horwitz, G.C. Moneti, R. Mountain, F. Muheim, Y. Mukhin, S. Playfer, Y. Rozen, S. Stone, X. Xing, G. Zhu, J. Bartelt, S.E. Csorna, Z. Egyed, V. Jain, D. Gibaut, K. Kinoshita, P. Pomianowski, B. Barish, M. Chadha, S. Chan, D.F. Cowen, G. Eigen, J.S. Miller, C. O'Grady, J. Urheim, A.J. Weinstein, M. Athanas, W. Brower, G. Masek, H.P. Paar, M. Sivertz, J. Gronberg, R. Kutschke, S. Menary, R.J. Morrison, S. Nakanishi, H.N. Nelson, T.K. Nelson, C. Qiao, J.D. Richman, A. Ryd, D. Sperka, H. Tajima, M.S. Witherell, R. Balest, K. Cho, W.T. Ford, D.R. Johnson, K. Lingel, M. Lohner, P. Rankin, J.G. Smith, J.P. Alexander, C. Bebek, K. Berkelman, K. Bloom, T.E. Browder, D.G. Cassel, H.A. Cho, D.M. Coffman, D.S. Crowcroft, P.S. Drell, D.J. Dumas, R. Ehrlich, P. Gaidarev, R.S. Galik, M. Garcia-Sciveres, B. Geiser, B. Gittelman, S.W. Gray, D.L. Hartill, B.K. Heltsley, S. Henderson, C.D. Jones, S.L. Jones, J. Kandaswamy, N. Katayama, P.C. Kim, D.L. Kreinick, G.S. Ludwig, J. Masui, J. Mevissen, N.B. Mistry, C.R. Ng, E. Nordberg, J.R. Patterson, D. Peterson, D. Riley, S. Salman, M. Sapper, F. Würthwein, P. Avery, A. Freyberger, J. Rodriguez, S. Yang, and J. Yelton

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Universality (philosophy), Electron, 01 natural sciences, Resonance (particle physics), Charged particle, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Lepton
Abstract

We have studied the leptonic decay of the $\Upsilon (1S)$ resonance into tau pairs using the CLEO II detector. A clean sample of tau pair events is identified via events containing two charged particles where exactly one of the particles is an identified electron. We find $B(\Upsilon(1S) \to \tau^+ \tau^-) = (2.61~\pm~0.12~{+0.09\atop{-0.13}})%$. The result is consistent with expectations from lepton universality.

Published
1994
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5. Observation of the decay

Author

S. Henderson, K. Kinoshita, F. Pipkin, M. Saulnier, R. Wilson, J. Wolinski, D. Xiao, H. Yamamoto, A.J. Sadoff, R. Ammar, P. Baringer, D. Coppage, R. Davis, M. Kelly, N. Kwak, H. Lam, S. Ro, Y. Kubota, M. Lattery, J.K. Nelson, D. Perticone, R. Poling, S. Schrenk, R. Wang, M.S. Alam, I.J. Kim, J.J. O'Neill, B. Nemati, V. Romero, H. Severini, C.R. Sun, P.-N. Wang, M.M. Zoeller, G. Crawford, R. Fulton, K.K. Gan, H. Kagan, R. Kass, J. Lee, R. Malchow, F. Morrow, M.K. Sung, J. Whitmore, P. Wilson, F. Butler, X. Fu, G. Kalbfleisch, M. Lambrecht, P. Skubic, J. Snow, P.-L. Wang, D. Bortoletto, D.N. Brown, J. Dominick, R.L. McIlwain, D.H. Miller, M. Modesitt, E.I. Shibata, S.F. Schaffner, I.P.J. Shipsey, M. Battle, J. Ernst, H. Kroha, S. Roberts, K. Sparks, E.H. Thorndike, C.-H. Wang, R. Stroynowski, M. Artuso, M. Goldberg, T. Haupt, N. Horwitz, R. Kennett, G.C. Moneti, S. Playfer, Y. Rozen, P. Rubin, T. Skwarnicki, S. Stone, M. Thulasidas, W.-M. Yao, G. Zhu, A.V. Barnes, J. Bartelt, S.E. Csorna, V. Jain, T. Letson, M.D. Mestayer, D.S. Akerib, B. Barish, D.F. Cowen, G. Eigen, J. Urheim, A.J. Weinstein, R.J. Morrison, H. Tajima, D. Schmidt, D. Sperka, M. Procario, M. Daoudi, W.T. Ford, D.R. Johnson, K. Lingel, M. Lohner, P. Rankin, J.G. Smith, J. Alexander, C. Bebek, K. Berkelman, D. Besson, T.E. Browder, D.G. Cassel, E. Cheu, D.M. Coffman, P.S. Drell, R. Ehrlich, R.S. Galik, M. Garcia-Sciveres, B. Geiser, B. Gittelman, S.W. Gray, D.L. Hartill, B.K. Heltsley, K. Honscheid, C. Jones, J. Kandaswamy, N. Katayama, P.C. Kim, D.L. Kreinick, G.S. Ludwig, J. Masui, J. Mevissen, N.B. Mistry, S. Nandi, C.R. Ng, E. Nordberg, C. O'Grady, J.R. Patterson, D. Peterson, D. Riley, M. Sapper, M. Selen, H. Worden, M. Worris, F. Würthwein, P. Avery, A. Freyberger, J. Rodriguez, and J. Yelton

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Experiment, Signal
Abstract

CLEO has observed a signal corresponding to the previously unseen decay ξ c 0 →Ω − K + . The observation of this decay mod points to W-exchange diagrams being an important contributor to the decays of the ξc0.

Published
1992
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6. Issues confronting vacuum system design for e/sup +/e/sup -/ storage rings

Author

N.B. Mistry

Subjects
Physics, Luminosity (scattering theory), Optics, business.industry, law, Computer data storage, Detector, Physics::Accelerator Physics, Systems design, business, Synchrotron, law.invention
Abstract

The challenges that face vacuum system design for high-intensity synchrotron light sources and for high luminosity e/sup +/e/sup -/ colliders are explored. Many of these challenges are common to the two types of storage rings. Constraints on beam-gas-induced detector backgrounds produced in the interaction region (IR) influence not just the vacuum system but the optics and the geometry of the IR. Experience gained by several groups is discussed, and some of the solutions used in synchrotron light sources are presented. >

Published
2002
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7. A Novel Differentially Pumped UHV Flange in the CESR Interaction Region

Author

Y. He, N.B. Mistry, Y. Li, and J.J. Cherwinka

Subjects
Materials science, Vacuum flange, business.industry, Nuclear engineering, Electrical engineering, Viton, Flange, Coil spring, Accelerators and Storage Rings, Outgassing, Cornell Electron Storage Ring, business, Electrical conductor, Beam (structure)
Abstract

We describe the design and performance of a novel ultra-high vacuum flange used for the upgrade of the interaction region (IR) of the Cornell Electron Storage Ring (CESR) where the CLEO High Energy Experiment is located. The differentially pumped, Viton O-ring sealed flange requires a low sealing force, allowing remotely controlled mechanical engagement. This provides flexibility and improved safety for the existing CLEO Be-beam pipe and attached silicon vertex (SVX) detector during installation of the CESR IR UHV system. To ensure acceptable vacuum performance of the flange joint over the operational lifetime, the radiation degradation and the outgassing properties of the Viton O-rings were investigated. We concluded that there was no significant seal degradation when the Viton O-rings were exposed to 5/spl times/10/sup 6/ Rad of /spl gamma/ radiation. The Viton O-ring outgassing rates were measured as a function of pumping time for various ambient air exposure times. One-dimensional finite element calculations showed that O-ring outgassing would have virtually no impact on the UHV operation. The flange also forms an axial RF seal with a canted coil spring and a radial RF seal with a electric conductive O-ring. This allows the joint to carry image currents from a storage beam up to 1 Amp. The IR UHV system including this so-called 'magic' flange joint has been operated successfully for two years, and has been successfully engaged and disengaged twice for upgrades of the CLEO detector.

Published
2001

8. Study of the B^0 Semileptonic Decay Spectrum at the Upsilon(4S) Resonance

Author

M Artuso, A Efimov, F Frasconi, M Gao, M Goldberg, D He, S Kopp, G.C Moneti, R Mountain, Y Mukhin, S Schuh, T Skwarnicki, S Stone, G Viehhauser, X Xing, J Bartelt, S.E Csorna, V Jain, S Marka, A Freyberger, R Godang, K Kinoshita, I.C Lai, P Pomianowski, S Schrenk, G Bonvicini, D Cinabro, R Greene, L.P Perera, B Barish, M Chadha, S Chan, G Eigen, J.S Miller, C O'Grady, M Schmidtler, J Urheim, A.J Weinstein, F Würthwein, D.M Asner, D.W Bliss, W.S Brower, G Masek, H.P Paar, V Sharma, J Gronberg, R Kutschke, D.J Lange, S Menary, R.J Morrison, H.N Nelson, T.K Nelson, C Qiao, J.D Richman, D Roberts, A Ryd, M.S Witherell, R Balest, B.H Behrens, K Cho, W.T Ford, H Park, P Rankin, J Roy, J.G Smith, J.P Alexander, C Bebek, B.E Berger, K Berkelman, K Bloom, D.G Cassel, H.A Cho, D.M Coffman, D.S Crowcroft, M Dickson, P.S Drell, K.M Ecklund, R Ehrlich, R Elia, A.D Foland, P Gaidarev, B Gittelman, S.W Gray, D.L Hartill, B.K Heltsley, P.I Hopman, J Kandaswamy, N Katayama, P.C Kim, D.L Kreinick, T Lee, Y Liu, G.S Ludwig, J Masui, J Mevissen, N.B Mistry, C.R Ng, E Nordberg, M Ogg, J.R Patterson, D Peterson, D Riley, A Soffer, C Ward, M Athanas, P Avery, C.D Jones, M Lohner, C Prescott, S Yang, J Yelton, J Zheng, G Brandenburg, R.A Briere, Y.S Gao, D.Y.-J Kim, R Wilson, H Yamamoto, T.E Browder, F Li, Y Li, J.L Rodriguez, T Bergfeld, B.I Eisenstein, J Ernst, G.E Gladding, G.D Gollin, R.M Hans, E Johnson, I Karliner, M.A Marsh, M Palmer, M Selen, J.J Thaler, K.W Edwards, A Bellerive, R Janicek, D.B MacFarlane, K.W McLean, P.M Patel, A.J Sadoff, R Ammar, P Baringer, A Bean, D Besson, D Coppage, C Darling, R Davis, N Hancock, S Kotov, I Kravchenko, N Kwak, S Anderson, Y Kubota, M Lattery, J.J O'Neill, S Patton, R Poling, T Riehle, V Savinov, A Smith, M.S Alam, S.B Athar, Z Ling, A.H Mahmood, H Severini, S Timm, F Wappler, A Anastassov, S Blinov, J.E Duboscq, K.D Fisher, D Fujino, R Fulton, K.K Gan, T Hart, K Honscheid, H Kagan, R Kass, J Lee, M.B Spencer, M Sung, A Undrus, R Wanke, A Wolf, M.M Zoeller, B Nemati, S.J Richichi, W.R Ross, P Skubic, M Wood, M Bishai, J Fast, E Gerndt, J.W Hinson, N Menon, D.H Miller, E.I Shibata, I.P.J Shipsey, M Yurko, L Gibbons, S.D Johnson, Y Kwon, S Roberts, E.H Thorndike, C.P Jessop, K Lingel, H Marsiske, M.L Perl, S.F Schaffner, D Ugolini, R Wang, X Zhou, T.E Coan, V Fadeyev, I Korolkov, Y Maravin, I Narsky, V Shelkov, J Staeck, R Stroynowski, I Volobouev, and J Ye

Subjects
Semileptonic decay, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, FOS: Physical sciences, 01 natural sciences, Spectral line, 3. Good health, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Lepton
Abstract

We have made a first measurement of the lepton momentum spectrum in a sample of events enriched in neutral B's through a partial reconstruction of B0 --> D*- l+ nu. This spectrum, measured with 2.38 fb**-1 of data collected at the Upsilon(4S) resonance by the CLEO II detector, is compared directly to the inclusive lepton spectrum from all Upsilon(4S) events in the same data set. These two spectra are consistent with having the same shape above 1.5 GeV/c. From the two spectra and two other CLEO measurements, we obtain the B0 and B+ semileptonic branching fractions, b0 and b+, their ratio, and the production ratio f+-/f00 of B+ and B0 pairs at the Upsilon(4S). We report b+/b0=0.950 (+0.117-0.080) +- 0.091, b0 = (10.78 +- 0.60 +- 0.69)%, and b+ = (10.25 +- 0.57 +- 0.65)%. b+/b0 is equivalent to the ratio of charged to neutral B lifetimes, tau+/tau0., 14 page, postscript file also available at http://w4.lns.cornell.edu/public/CLNS

Published
1997

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