Georg Viehhauser: Publications

Y dipion transitions at energies near the Y(4S)

Physical Review D 59:5 (1999)

Authors:

S Glenn, Y Kwon, AL Lyon, S Roberts, EH Thorndike, CP Jessop, K Lingel, H Marsiske, ML Perl, V Savinov, D Ugolini, X Zhou, TE Coan, V Fadeyev, I Korolkov, Y Maravin, I Narsky, R Stroynowski, J Ye, T Wlodek, M Artuso, E Dambasuren, S Kopp, GC Moneti, R Mountain, S Schuh, T Skwarnicki, S Stone, A Titov, G Viehhauser, JC Wang, J Bartelt, SE Csorna, KW McLean, S Marka, Z Xu, R Godang, K Kinoshita, IC Lai, P Pomianowski, S Schrenk, G Bonvicini, D Cinabro, R Greene, LP Perera, GJ Zhou, S Chan, G Eigen, E Lipeles, JS Miller, M Schmidtler, A Shapiro, WM Sun, J Urheim, AJ Weinstein, F Würthwein, DE Jaffe, G Masek, HP Paar, EM Potter, S Prell, V Sharma, DM Asner, J Gronberg, TS Hill, DJ Lange, RJ Morrison, HN Nelson, TK Nelson, D Roberts, BH Behrens, WT Ford, A Gritsan, H Krieg, KJ Roy, JG Smith, JP Alexander, R Baker, C Bebek, BE Berger, K Berkelman, V Boisvert, DG Cassel, DS Crowcroft, M Dickson, S Von Dombrowski, PS Drell, KM Ecklund, R Ehrlich, AD Foland, P Gaidarev, RS Galik, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, PI Hopman, J Kandaswamy

Abstract:

Using a 4.19 fb -1 data sample collected with the CLEO II detector at the Cornell Electron Storage Ring, we have searched for dipion transitions between pairs of Y resonances at center of mass energies E c.m. = 10.58 GeV and E c.m. = 10.52GeV. We obtain the 90% confidence level upper limits B(Y(4S) →Y(2S)π + π - )<3.9×10 -4 and B(Y(4S)→Y(1S)π + π - )<1.2×10 -4 . We also observe the transitions Y(3S)→Y(1S)π + π - , Y(3S)→Y(2S)π + π - , and Y(2S)→Y(1S)π + π - , from which we measure the cross sections for the radiative processes e + e - →Y(3S)γ and e + e - →Y(2S)γ. We obtain σ ee→Y(3S)γ = (17.8±3.0±1.7) pb and σ ee→Y(2S)γ =(15.5±1.3±1.4) pb at E c.m. = 10.58 GeV, and σ ee→Y(3S)γ =(27.3±5.0±2.6) pb and σ ee→Y(2S)γ =(16.3±1.8±1.5) pb at E c.m. = 10.52 GeV, which we compare with theoretical predictions. ©1999 The American Physical Society.

Performance of the CLEO III LiF-TEA Ring Imaging Cherenkov Detector in a High Energy Muon Beam

(1999)

Authors:

M Artuso, R Ayad, F Azfar, A Efimov, S Kopp, R Mountain, G Majumder, S Schuh, T Skwarnicki, S Stone, G Viehhauser, JC Wang, T Coan, V Fadeyev, I Volobouev, J Ye, S Anderson, Y Kubota, A Smith, E Lipeles

The CLEO-III ring imaging Cherenkov detector

NUCL INSTRUM METH A 433:1-2 (1999) 77-86

Authors:

RJ Mountain, M Artuso, R Ayad, F Azfar, A Efimov, S Kopp, G Majumder, S Schuh, T Skwarnicki, S Stone, G Viehhauser, JC Wang, S Anderson, A Smith, Y Kubota, E Lipeles, T Coan, J Staeck, V Fadeyev, I Volobouev, J Ye

Abstract:

The CLEO-III detector upgrade for charged particle identification is discussed. The RICH design uses solid LiF crystal radiators coupled with multi-wire chamber photon detectors, using TEA as the photosensor, and low-noise Viking readout electronics. Results from our beam test at Fermilab are presented. (C) 1999 Elsevier Science B.V. All rights reserved.

Search for exclusive rare baryonic decays of B mesons

Physical Review D - Particles, Fields, Gravitation and Cosmology 59:11 (1999) 1-5

Authors:

TE Coan, V Fadeyev, I Korolkov, Y Maravin, I Narsky, R Stroynowski, J Ye, T Wlodek, M Artuso, E Dambasuren, S Kopp, GC Moneti, R Mountain, S Schuh, T Skwarnicki, S Stone, A Titov, G Viehhauser, JC Wang, J Bartelt, SE Csorna, KW McLean, S Marka, Z Xu, R Godang, K Kinoshita, IC Lai, P Pomianowski, S Schrenk, G Bonvicini, D Cinabro, R Greene, LP Perera, GJ Zhou, S Chan, G Eigen, E Lipeles, JS Miller, M Schmidtler, A Shapiro, WM Sun, J Urheim, AJ Weinstein, F Würthwein, DE Jaffe, G Masek, HP Paar, EM Potter, S Prell, V Sharma, DM Asner, J Gronberg, TS Hill, CM Korte, DJ Lange, RJ Morrison, HN Nelson, TK Nelson, D Roberts, H Tajima, BH Behrens, WT Ford, A Gritsan, H Krieg, J Roy, JG Smith, JP Alexander, R Baker, C Bebek, BE Berger, K Berkelman, V Boisvert, DG Cassel, DS Crowcroft, M Dickson, S Von Dombrowski, PS Drell, KM Ecklund, R Ehrlich, AD Foland, P Gaidarev, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, PI Hopman, J Kandaswamy, N Katayama, DL Kreinick, T Lee, Y Liu, NB Mistry, CR Ng, E Nordberg, M Ogg, JR Patterson, D Peterson, D Riley, A Soffer

Abstract:

We report the results of a search for the rare baryonic decay modes B0→ΛΛ̄, B+→Λ̄p, B0→Λ̄pπ-, and B0→pp̄ (and their charge conjugate states) using 5.8 × 106 BB̄ pairs collected with the CLEO detector. We see no statistically significant signals in any of these modes and set 90% confidence level upper limits on their branching fractions, B(B0→ΛΛ̄)<3.9 × 10-6, B(B+→Λ̄p)<2.6 × 10-6, B(B0→Λ̄pπ-)<1.3 × 10-5 and B(B0→pp̄)<7.0 × 10-6. ©1999 The American Physical Society.

Search for baryon and lepton number violating decays of the τ lepton

Physical Review D Particles Fields Gravitation and Cosmology 59:9 (1999) 1-4

Authors:

R Godang, K Kinoshita, IC Lai, P Pomianowski, S Schrenk, G Bonvicini, D Cinabro, R Greene, LP Perera, GJ Zhou, S Chan, G Eigen, E Lipeles, JS Miller, M Schmidtler, A Shapiro, WM Sun, J Urheim, AJ Weinstein, F Würthwein, DE Jaffe, G Masek, HP Paar, EM Potter, S Prell, V Sharma, DM Asner, A Eppich, J Gronberg, TS Hill, DJ Lange, RJ Morrison, HN Nelson, TK Nelson, D Roberts, BH Behrens, WT Ford, A Gritsan, H Krieg, J Roy, JG Smith, JP Alexander, R Baker, C Bebek, BE Berger, K Berkelman, V Boisvert, DG Cassel, DS Crowcroft, M Dickson, S Von Dombrowski, PS Drell, KM Ecklund, R Ehrlich, AD Foland, P Gaidarev, RS Galik, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, PI Hopman, DL Kreinick, T Lee, Y Liu, TO Meyer, NB Mistry, CR Ng, E Nordberg, M Ogg, JR Patterson, D Peterson, D Riley, A Soffer, JG Thayer, PG Thies, B Valant-Spaight, A Warburton, C Ward, M Athanas, P Avery, CD Jones, M Lohner, C Prescott, AI Rubiera, J Yelton, J Zheng, G Brandenburg, RA Briere, A Ershov, YS Gao, DYJ Kim, R Wilson, TE Browder, Y Li, JL Rodriguez, H Yamamoto, T Bergfeld, BI Eisenstein

Abstract:

We have searched for five decay modes of the τ lepton that simultaneously violate lepton and baryon number: τ^-→p̄γ, τ^-→p̄π⁰, τ^-→p̄η, τ^-→p̄2π⁰, and τ^-→p̄π⁰η. The data used in the search were collected with the CLEO II detector at the Cornell Electron Storage Ring. The integrated luminosity of the data sample is 4.7 fb^-1, corresponding to the production of 4.3 × 10⁶ τ⁺τ^- events. No evidence is found for any of the decays, resulting in much improved upper limits on the branching fractions for the two-body decays and first upper limits for the three-body decays. ©1999 The American Physical Society.

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