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First observation of τ → 3πηντ and τ → f1 πντ decays

Physical Review Letters 79:13 (1997) 2406-2410

Authors:

T Bergfeld, BI Eisenstein, J Ernst, GE Gladding, GD Gollin, RM Hans, E Johnson, I Karliner, MA Marsh, M Palmer, M Selen, JJ Thaler, KW Edwards, A Bellerive, R Janicek, DB MacFarlane, PM Patel, AJ 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, SJ Lee, JJ O’neill, S Patton, R Poling, T Riehle, V Savinov, A Smith, MS Alam, SB Athar, Z Ling, AH Mahmood, H Severini, S Timm, F Wappler, A Anastassov, S Blinov, JE Duboscq, D Fujino, KK Gan, T Hart, K Honscheid, H Kagan, R Kass, J Lee, MB Spencer, M Sung, A Undrus, R Wanke, A Wolf, MM Zoeller, B Nemati, SJ Richichi, WR Ross, P Skubic, M Bishai, J Fast, E Gerndt, JW Hinson, N Menon, DH Miller, EI Shibata, IPJ Shipsey, M Yurko, L Gibbons, S Glenn, SD Johnson, Y Kwon, S Roberts, EH Thorndike, CP Jessop, K Lingel, H Marsiske, ML Perl, D Ugolini, R Wang, X Zhou, TE Coan, V Fadeyev, I Korolkov, Y Maravin, I Narsky, V Shelkov, J Staeck, R Stroynowski, I Volobouev, J Ye, M Artuso, A Efimov, M Gao

Abstract:

We have observed new channels for τ decays with an η in the final state. We study 3-prong tau decays, using the η → γγ and η → 3π0 decay modes and 1-prong decays with two π0’s using the η → γγ channel. The measured branching fractions are B(τ → π−π−π+ηντ = (3.4+0.6-0.5 ± 0.6) × 10-4 and B(τ− → π−2π0ηντ = (1.4 ± 0.6 ± 0.3) × 10-4. We observe clear evidence for f1 → ηππ substructure and measure B(τ− → f1π−ντ) = (5.8+1.4-1.3 ± 1.8) × 10-4. We have also searched for η′(958) production and obtain 90% C.L. upper limits B(τ → π−η′ντ) < 7.4 × 10-5 and B(τ → π−π0η′ντ) < 8.0 × 10-5. © 1997 American Physical Society.

Properties of Jets in W Boson Events from 1.8 TeV pbar p Collisions

ArXiv hep-ex/9709016 (1997)

Search for First Generation Leptoquark Pair Production in ppbar Collisions at s^1/2 = 1.8 TeV

ArXiv hep-ex/9708017 (1997)

Authors:

F Abe, The CDF Collaboration

Search for B→μν¯μγ and B→eν¯eγ

Physical Review D American Physical Society (APS) 56:1 (1997) 11-16

Authors:

TE Browder, F Li, Y Li, JL Rodriguez, T Bergfeld, BI Eisenstein, J Ernst, GE Gladding, GD Gollin, E Johnson, I Karliner, M Palmer, M Selen, JJ Thaler, KW Edwards, A Bellerive, DI Britton, R Janicek, DB MacFarlane, KW McLean, PM Patel, AJ 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, JJ O’Neill, S Patton, R Poling, T Riehle, A Smith, V Savinov, MS Alam, SB Athar, Z Ling, AH Mahmood, H Severini, S Timm, F Wappler, A Anastassov, S Blinov, JE Duboscq, R Fulton, D Fujino, KK Gan, T Hart, K Honscheid, H Kagan, R Kass, J Lee, M Sung, A Undrus, R Wanke, A Wolf, MM Zoeller, B Nemati, SJ Richichi, WR Ross, P Skubic, M Wood, M Bishai, J Fast, E Gerndt, JW Hinson, DH Miller, EI Shibata, IPJ Shipsey, M Yurko, L Gibbons, SD Johnson, Y Kwon, S Roberts, EH Thorndike, CP Jessop, K Lingel, H Marsiske, ML Perl, SF Schaffner, D Ugolini, R Wang, X Zhou, TE Coan, V Fadeyev, I Korolkov, Y Maravin, I Narsky, V Shelkov, R Stroynowski, J Staeck, I Volobouev, J Ye, M Artuso, A Efimov, M Gao, M Goldberg, R Greene, F Frasconi, D He, S Kopp, GC Moneti, R Mountain, Y Mukhin, S Schuh, T Skwarnicki, S Stone, X Xing, J Bartelt, SE Csorna, V Jain, S Marka, A Freyberger, R Godang, D Gibaut, K Kinoshita, IC Lai, P Pomianowski, S Schrenk, G Bonvicini, D Cinabro, LP Perera, B Barish, M Chadha, S Chan, G Eigen, JS Miller, C O’Grady, M Schmidtler, J Urheim, AJ Weinstein, F Würthwein, DM Asner, DW Bliss, WS Brower, G Masek, HP Paar, J Gronberg, CM Korte, DJ Lange, R Kutschke, S Menary, RJ Morrison, S Nakanishi, HN Nelson, TK Nelson, C Qiao, JD Richman, D Roberts, A Ryd, H Tajima, MS Witherell, R Balest, BH Behrens, K Cho, WT Ford, H Park, P Rankin, J Roy, JG Smith, JP Alexander, C Bebek, BE Berger, K Berkelman, K Bloom, DG Cassel, HA Cho, DM Coffman, DS Crowcroft, M Dickson, PS Drell, R Ehrlich, R Elia, AD Foland, P Gaidarev, B Gittelman, SW Gray, DL Hartill, BK Heltsley, PI Hopman, SL Jones, J Kandaswamy, N Katayama, PC Kim, DL Kreinick, T Lee, Y Liu, GS Ludwig, J Masui, J Mevissen, NB Mistry, CR Ng, E Nordberg, M Ogg, JR Patterson, D Peterson, D Riley, A Soffer, C Ward, P Avery, M Athanas, CD Jones, M Lohner, C Prescott, S Yang, J Yelton, J Zheng, G Brandenburg, RA Briere, DY-J Kim, T Liu, M Saulnier, R Wilson, H Yamamoto

A Measurement of the Michel Parameters in Leptonic Decays of the Tau

Physical Review Letters 78:25 (1997) 4686-4690

Authors:

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, JJ O’Neill, S Patton, R Poling, T Riehle, V Savinov, A Smith, MS Alam, SB Athar, Z Ling, AH Mahmood, H Severini, S Timm, F Wappler, A Anastassov, S Blinov, JE Duboscq, D Fujino, R Fulton, KK Gan, T Hart, K Honscheid, H Kagan, R Kass, J Lee, MB Spencer, M Sung, A Undrus, R Wanke, A Wolf, MM Zoeller, B Nemati, SJ Richichi, WR Ross, P Skubic, M Wood, M Bishai, J Fast, E Gerndt, JW Hinson, N Menon, DH Miller, EI Shibata, IPJ Shipsey, M Yurko, L Gibbons, SD Johnson, Y Kwon, S Roberts, EH Thorndike, CP Jessop, K Lingel, H Marsiske, ML Perl, SF Schaffner, D Ugolini, R Wang, X Zhou, TE 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, GC Moneti, R Mountain, Y Mukhin, S Schuh, T Skwarnicki, S Stone, G Viehhauser, X Xing, J Bartelt, SE Csorna, V Jain, S Marka

Abstract:

We have measured the spectral shape Michel parameters ρ and η using leptonic decays of the τ, recorded by the CLEO II detector. Assuming e - μ universality in the vectorlike couplings, we find ρμ = 0.735 ± 0.013 ± 0.008, where the first error is statistical and the second systematic. We also present measurements for the parameters for e and μ final states separately. © 1997 The American Physical Society.