Georg Viehhauser: Publications

Evidence for the decay D⁰ → Κ⁺π^-π⁺π^-

Physical Review D 64:11 (2001)

Authors:

SA Dytman, V Savinov, S Chen, JW Hinson, J Lee, DH Miller, EI Shibata, IPJ Shipsey, V Pavlunin, D Cronin-Hennessy, AL Lyon, W Park, EH Thorndike, TE Coan, YS Gao, F Liu, Y Maravin, I Narsky, R Stroynowski, J Ye, M Artuso, C Boulahouache, K Bukin, E Dambasuren, G Majumder, R Mountain, T Skwarnicki, S Stone, JC Wang, H Zhao, S Kopp, M Kostin, AH Mahmood, SE Csorna, I Danko, KW McLean, Z Xu, G Bonvicini, D Cinabro, M Dubrovin, S McGee, A Bornheim, E Lipeles, SP Pappas, A Shapiro, WM Sun, AJ Weinstein, R Mahapatra, G Masek, HP Paar, RJ Morrison, HN Nelson, RA Briere, GP Chen, T Ferguson, H Vogel, JP Alexander, C Bebek, K Berkelman, F Blanc, V Boisvert, DG Cassel, PS Drell, JE Duboscq, KM Ecklund, R Ehrlich, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, L Hsu, CD Jones, J Kandaswamy, DL Kreinick, M Lohner, A Magerkurth, H Mahlke-Krüger, TO Meyer, NB Mistry, E Nordberg, M Palmer, JR Patterson, D Peterson, J Pivarski, D Riley, H Schwarthoff, JG Thayer, D Urner, B Valant-Spaight, G Viehhauser, A Warburton, M Weinberger, SB Athar, P Avery, C Prescott, H Stoeck, J Yelton, G Brandenburg, A Ershov

Abstract:

We present a search for the "wrong-sign" decay D0 → Κ+π-π+π- using 9 fb-1 of e+e- collisions on and just below the Y(4S) resonance. This decay can occur either through a doubly Cabibbo-suppressed process or through mixing to a D̄0 followed by a Cabibbo-favored process. Our result for the time-integrated wrong-sign rate relative to the decay D0 → Κ-π+π-π+ is (0.0041-0.0011+0.0012(stat)±0.0004(syst))×(1.07 ±0.10)(phase space), which has a statistical significance of 3.9 standard deviations. ©2001 The American Physical Society.

K-shell photodetachment of Li(-): experiment and theory.

Physical review letters 87:25 (2001) 253002

Authors:

N Berrah, JD Bozek, AA Wills, G Turri, HL Zhou, ST Manson, G Akerman, B Rude, ND Gibson, CW Walter, L VoKy, A Hibbert, SM Ferguson

Abstract:

An experimental K-shell photodetachment study of Li(-) giving rise to doubly photoionized Li(+) ions has been carried out at the Advanced Light Source, using a collinear photon-ion beam apparatus. The experiment reveals dramatic structure, differing substantially both qualitatively and quantitatively from the corresponding processes above the 1s ionization threshold in Li and Li(+), as predicted by our enhanced R-matrix calculation. The experimental/theoretical comparison shows good agreement over some of the photon energy range, and also reveals some puzzling discrepancies.

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First observation of B̄→D^(*) ρ′^-, ρ′^-→ωπ^-

Physical Review D 64:9 (2001)

Authors:

JP Alexander, C Bebek, BE Berger, K Berkelman, F Blanc, V Boisvert, DG Cassel, PS Drell, JE Duboscq, KM Ecklund, R Ehrlich, P Gaidarev, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, L Hsu, CD Jones, J Kandaswamy, DL Kreinick, M Lohner, A Magerkurth, TO Meyer, NB Mistry, E Nordberg, M Palmer, JR Patterson, D Peterson, D Riley, A Romano, H Schwarthoff, JG Thayer, D Urner, B Valant-Spaight, G Viehhauser, A Warburton, P Avery, C Prescott, AI Rubiera, H Stoeck, J Yelton, G Brandenburg, A Ershov, DYJ Kim, R Wilson, T Bergfeld, BI Eisenstein, J Ernst, GE Gladding, GD Gollin, RM Hans, E Johnson, I Karliner, MA Marsh, C Plager, C Sedlack, M Selen, JJ Thaler, J Williams, KW Edwards, AJ Sadoff, R Ammar, A Bean, D Besson, X Zhao, S Anderson, VV Frolov, Y Kubota, SJ Lee, R Poling, A Smith, CJ Stepaniak, J Urheim, S Ahmed, MS Alam, SB Athar, L Jian, L Ling, M Saleem, S Timm, F Wappler, A Anastassov, E Eckhart, KK Gan, C Gwon, T Hart, K Honscheid, D Hufnagel, H Kagan, R Kass, TK Pedlar, JB Thayer, E Von Toerne, MM Zoeller, SJ Richichi, H Severini, P Skubic, A Undrus, V Savinov

Abstract:

We report on the observation of B̄→D*π+π-π-π 0 decays. The branching ratios for D*+ and D*0 are (1.72±0.14±0.24)% and (1.80±0.24±0.27)%, respectively. Each final state has a a D*ωπ- component, with branching ratios (0.29±0.03±0.04)% and (0.45±0.10±0.07)% for the D*+ and D*0 modes, respectively. We also observe B̄→Dωπ- decays. The branching ratios for D+ and D0 are (0.28±0.05±0.04)% and (0.41±0.07±0.06)%, respectively. A spin parity analysis of the ωπ- system in the Dωπ- final state shows a preference for a wide 1- resonance. A fit to the ωπ- mass spectrum finds a central mass of (1349 ±25-5+10) MeV and width of (547±86-45+46) MeV. We identify this object as the ρ(1450) or the ρ′. ©2001 The American Physical Society.

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Search for CP violation in τ → ππ⁰ντ decay

Physical Review D 64:9 (2001)

Authors:

P Avery, C Prescott, AI Rubiera, H Stoeck, J Yelton, G Brandenburg, A Ershov, DYJ Kim, R Wilson, T Bergfeld, BI Eisenstein, J Ernst, GE Gladding, GD Gollin, RM Hans, E Johnson, I Karliner, MA Marsh, C Plager, C Sedlack, M Selen, JJ Thaler, J Williams, KW Edwards, AJ Sadoff, R Ammar, A Bean, D Besson, X Zhao, S Anderson, VV Frolov, Y Kubota, SJ Lee, JJ O'Neill, R Poling, A Smith, CJ Stepaniak, J Urheim, S Ahmed, MS Alam, SB Athar, L Jian, L Ling, M Saleem, S Timm, F Wappler, A Anastassov, E Eckhart, KK Gan, C Gwon, T Hart, K Honscheid, D Hufnagel, H Kagan, R Kass, TK Pedlar, JB Thayer, E Von Toerne, MM Zoeller, SJ Richichi, H Severini, P Skubic, A Undrus, V Savinov, S Chen, J Fast, JW Hinson, J Lee, DH Miller, EI Shibata, IPJ Shipsey, V Pavlunin, D Cronin-Hennessy, AL Lyon, EH Thorndike, TE Coan, V Fadeyev, YS Gao, Y Maravin, I Narsky, R Stroynowski, J Ye, T Wlodek, M Artuso, C Boulahouache, K Bukin, E Dambasuren, G Majumder, R Mountain, S Schuh, T Skwarnicki, S Stone, JC Wang, A Wolf, J Wu, S Kopp, M Kostin, AH Mahmood, SE Csorna, I Danko

Abstract:

We search for CP nonconservation in the decays of τ leptons produced via e+e- annihilation at √s ∼ 10.6 GeV. The method uses correlated decays of pairs of τ leptons, each decaying to the ππ0ντ final state. The search is done within the framework of a model with a scalar boson exchange. In an analysis of a data sample corresponding to 12.2×106 produced τ pairs collected with the CLEO detector, we find no evidence of violation of CP symmetry. We obtain a limit on the imaginary part of the coupling constant parametrizing the relative contribution of diagrams that would lead to CP violation to be -0.046

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Improved upper limits on the flavor-changing neutral current decays B → Kℓ⁺ℓ^- and B → K* (892)ℓ⁺ℓ^-

Physical Review Letters 87:18 (2001) 1818031-1818035

Authors:

S Anderson, VV Frolov, Y Kubota, SJ Lee, R Poling, A Smith, CJ Stepaniak, J Urheim, S Ahmed, MS Alam, SB Athar, L Jian, L Ling, M Saleem, S Timm, F Wappler, A Anastassov, E Eckhart, KK Gan, C Gwon, T Hart, K Honscheid, D Hufnagel, H Kagan, R Kass, TK Pedlar, JB Thayer, E Von Toerne, MM Zoeller, SJ Richichi, H Severini, P Skubic, A Undrus, V Savinov, S Chen, JW Hinson, J Lee, DH Miller, EI Shibata, IPJ Shipsey, V Pavlunin, D Cronin-Hennessy, Y Kwon, AL Lyon, W Park, EH Thorndike, TE Coan, YS Gao, Y Maravin, I Narsky, R Stroynowski, J Ye, T Wlodek, M Artuso, K Benslama, C Boulahouache, K Bukin, E Dambasuren, G Majumder, R Mountain, T Skwarnicki, S Stone, JC Wang, A Wolf, S Kopp, M Kostin, AH Mahmood, SE Csorna, I Danko, KW McLean, Z Xu, R Godang, G Bonvicini, D Cinabro, M Dubrovin, S McGee, A Bornheim, G Eigen, E Lipeles, SP Pappas, A Shapiro, WM Sun, AJ Weinstein, DE Jaffe, R Mahapatra, G Masek, HP Paar, A Eppich, RJ Morrison, RA Briere, GP Chen, T Ferguson, H Vogel, JP Alexander, C Bebek, BE Berger, K Berkelman, F Blanc, V Boisvert, DG Cassel

Abstract:

The flavor-changing neutral current (FCNC) decay was studied using Monte Carlo simulations to determine the efficiency for detecting the signal modes. The upper limits on branching fractions were obtained and no indication of a signal were obtained for the decay. Systematic and statistical errors for the process were calculated numerically.

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Georg Viehhauser

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Evidence for the decay D⁰ → Κ⁺π^-π⁺π^-

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K-shell photodetachment of Li(-): experiment and theory.

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First observation of B̄→D^(*) ρ′^-, ρ′^-→ωπ^-

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Search for CP violation in τ → ππ⁰ντ decay

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Improved upper limits on the flavor-changing neutral current decays B → Kℓ⁺ℓ^- and B → K* (892)ℓ⁺ℓ^-

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Georg Viehhauser

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Evidence for the decay D0 → Κ+π-π+π-

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K-shell photodetachment of Li(-): experiment and theory.

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First observation of B̄→D(*) ρ′-, ρ′-→ωπ-

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Search for CP violation in τ → ππ0ντ decay

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Improved upper limits on the flavor-changing neutral current decays B → Kℓ+ℓ- and B → K* (892)ℓ+ℓ-

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Evidence for the decay D⁰ → Κ⁺π^-π⁺π^-

First observation of B̄→D^(*) ρ′^-, ρ′^-→ωπ^-

Search for CP violation in τ → ππ⁰ντ decay

Improved upper limits on the flavor-changing neutral current decays B → Kℓ⁺ℓ^- and B → K* (892)ℓ⁺ℓ^-