An upper limit on the branching ratio for τ decays into seven charged particles

Ackerstaff, K.; Alexander, G.; Allison, J.; Altekamp, N.; Anderson, K. J.; Anderson, S.; Arcelli, S.; Asai, S.; Axen, D.; Azuelos, G.; Ball, A. H.; Barberio, E.; Barlow, R. J.; Bartoldus, R.; Batley, J. R.; Baumann, S.; Bechtluft, J.; Beeston, C.; Behnke, T.; Bell, A. N.; Bell, K. W.; Bella, G.; Bentvelsen, S.; Berlich, P.; Bethke, S.; Biebel, O.; Biguzzi, A.; Bird, S. D.; Blobel, V.; Bloodworth, I. J.; Bloomer, J. E.; Bobinski, M.; Bock, P.; Bonacorsi, D.; Boutemeur, M.; Bouwens, B.; Braibant, S.; Brigliadori, L.; Brown, R. M.; Burckhart, H.; Burgard, C. D.; Bürgin, R.; Capiluppi, P.; Carnegie, R. K.; Carter, A. A.; Carter, J. R.; Chang, C. Y.; Charlton, David; Chrisman, D.; Clarke, P. E.L.; Cohen, I.; Conboy, J. E.; Cooke, O. C.; Cuffiani, M.; Dado, S.; Dallapiccola, C.; Dallavalle, G. M.; Jong, S. J. De; Pozo, L. A. del; Desch, K.; Dixit, M. S.; Silva, E. do Couto e; Doucet, M.; Duchovni, E.; Duckeck, G.; Duerdoth, I. P.; Eatough, D.; Edwards, J. E.G.; Estabrooks, P. G.; Evans, H.; Evans, Meirin Oan; Fabbri, F.; Fanti, M.; Faust, A. A.; Fiedler, F.; Fierro, M.; Fischer, H. M.; Fleck, I.; Folman, R.; Fong, D. G.; Foucher, M.; Fürtjes, A.; Futyan, D. I.; Gagnon, P.; Gary, J. W.; Gascon, J.; Gascon-Shotkin, S. M.; Geddes, N. I.; Geich-Gimbel, Ch.; Geralis, T.; Giacomelli, G.; Giacomelli, P.; Giacomelli, Roberto; Gibson, V.; Gibson, W. R.; Gingrich, D. M.; Glenzinskí, D.; Goldberg, J.; Goodrick, M. J.; Gorn, W.; Grandi, C.; Gross, E.; Grunhaus, J.; Gruwé, M.; Hajdú, C.; Hanson, G.; Hansroul, M.; Hapke, M.; Hargrove, C. K.; Hart, P. A.; Hartmann, C.; Hauschild, M.; Hawkes, C. M.; Hawkings, R. J.; Hemingway, R. J.; Herndon, M.; Herten, G.; Heuer, R. D.; Hildreth, M.; Hill, J. C.; Hillier, S. J.; Hilse, T.; Hobson, P. R.; Homer, R. J.; Honma, A. K.; Horváth, D.; Howard, Robert; Hutchcroft, D. E.; Igo‐Kemenes, P.; Imrie, D. C.; Ingram, Martin; Ishii, K.; Jawahery, A.; Jeffreys, P. W.; Jérémie, H.; Jimack, M.; Joly, A.; Jones, C. R.; Jones, G.; Jones, M.; Jost, U.; Jovanović, P.; Junk, T. R.; Karlen, D.; Kartvelishvili, Vakhtang; Kawagoe, K.; Kawamoto, T.; Keeler, R.; Kellogg, R. G.; Kennedy, B. W.; Kirk, J.; Klier, A.; Kluth, S.; Kobayashi, Tatsuo; Kobel, M.; Koetke, D. S.; Kokott, T. P.; Kolrep, M.; Komamiya, S.; Kress, T.; Krieger, P.; Krogh, J. von; Kyberd, P.; Lafferty, G. D.; Lahmann, R.; Lai, W. P.; Lanske, D.; Lauber, J.; Lautenschlager, S. R.; Layter, J. G.; Lazic, D.; Lee, A. M.; Lefebvre, E.; Lellouch, D.; Letts, J.; Levinson, L. J.; Lloyd, S. L.; Loebinger, F. K.; Long, G. D.; Losty, M. J.; Ludwig, J.; Macchiolo, A.; Macpherson, A.; Mannelli, M.; Marcellini, S.; Markus, C.; Martin, A. J.; Martin, J. P.; Martı́nez, G.; Mäshimo, T.; Mättig, P.; McDonald, W. J.; McKenna, J. A.; Mckigney, E. A.; McMahon, Thomas J.; McPherson, R. A.; Meijers, F.; Menke, S.; Merritt, ES; Mes, H.; Meyer, J.; Michelini, A.; Mikenberg, G.; Miller, D. J.; Mincer, A. I.; Mir, R.; Mohr, W.; Montanari, A.; Mori, T.; Morii, M.; Müller, U.; Nagai, K.; Nakamura, I.; Neal, H. A.; Nellen, B.; Nisius, R.; O’Neale, S. W.; Oakham, F. G.; Odorici, F.; Ogren, H. O.; Oldershaw, N. J.; Oreglia, M. J.; Orito, S.; Pálinkás, J.; Pásżtor, G.; Pater, J. R.; Patrick, G. N.; Patt, J.; Pearce, M. J.; Petzold, S.; Pfeifenschneider, P.; Pilcher, J. E.; Pinfold, J. L.; Plane, D. E.; Poffenberger, P.; Poli, B.; Posthaus, A.; Przysiezniak, H.; Rees, D. L.; Rigby, D.; Robertson, S. H.; Robins, S. A.; Rodning, N.; Roney, J. M.; Rooke, A.; Ros, E.; Rossi, A. M.; Rosvick, M.; Routenburg, P.; Rozen, Y.; Runge, K.; Runólfsson, Ö.; Rüppel, Uwe; Rust, D. R.; Ryłko, R.; Sachs, K.; Saeki, T.; Sarkisyan, E. K.G.; Sbarra, C.; Schaile, A. D.; Schaile, O.; Scharf, F.; Scharff-Hansen, P.; Schenk, P.; Schieck, J.; Schleper, P.; Schmitt, B.; Schmitt, S.; Schöning, A.; Schröder, M.; Schultz‐Coulon, H.‐C.; Schulz, M.; Schumacher, M.; Schwick, C.; Scott, W. G.; Shears, T.; Shen, B. C.; Shepherd‐Themistocleous, C. H.; Sherwood, P.; Siroli, G. P.; Sittler, A.; Skillman, A.; Skuja, A.; Smith, A. M.; Snow, G. A.; Sobie, R.; Söldner-Rembold, S.; Springer, R. W.; Sproston, M.; Stephens, K.; Steuerer, J.; Stockhausen, B.; Stoll, K.; Strom, D.; Szymański, P.; Tafirout, R.; Talbot, S. D.; Tanaka, Shun‐ichi; Taras, P.; Tarem, S.; Teuscher, R. J.; Thiergen, M.; Thomson, M. A.; Torne, Eckhard von; Towers, S.; Trigger, I. M.; Tsur, E.; Turcot, A. S.; Turner-Watson, M. F.; Utzat, P.; Kooten, R. Van; Verzocchi, M.; Vikas, P.; Vokurka, E. H.; Voss, H.; Wäckerle, F.; Wagner, A.; Ward, C. P.; Ward, D. R.; Watkins, P. M.; Watson, A. T.; Watson, N. K.; Wells, P. S.; Wermes, N.; White, J. S.; Wilkens, B.; Wilson, G. W.; Wilson, J. A.; Wolf, G.; Wyatt, T. R.; Yamashita, Shinji; Yekutieli, G.; Zacek, V.; Zer-Zion, D.

doi:10.1016/s0370-2693(97)00648-5

Cited by 5 publications

(1 citation statement)

References 24 publications

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“…In addition to the 6(8) GTVL tracks in an event, a minimum 4(6) of these 6 (8) tracks are required to have at least 12 drift chamber hits and a minimum transverse momentum of 100 MeV/c. Such tracks belong to the GoodTrackLoose (GTL) list.…”

Section: Charged Track Candidatesmentioning

confidence: 99%

Search for Rare Multi-Pion Decays of the Tau Lepton Using the BABAR Detector

Ter-Antonyan

2007

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A search for the decay of the τ lepton to rare multi-pion final states is performed using the BABAR detector at the PEP-II asymmetric-energy e + e − collider. The analysis uses 232 fb −1 of data at center-of-mass energies on or near the Υ(4S) resonance.In the search for the τ − → 3π − 2π + 2π 0 ν τ decay, we observe 10 events with an expected background of 6.5In the absence of a signal, we calculate the decay branching ratio upper limit B(τ.4 × 10 −6 at the 90 % confidence level. This is more than a factor of 30 improvement over the previously established limit. In addition, we search for the exclusive decay mode τwith the further decay of ω → π − π + π 0 . We observe 1 event, expecting 0.4ground events, and calculate the upper limit B(τ − → 2ωπ − ν τ ) < 5.4 × 10 −7 at the 90 % confidence level. This is the first upper limit for this mode.In the search for the τ − → 4π − 3π + (π 0 )ν τ decay, we observe 24 events with an expected background of 21.6±1.3 events. In the absence of a signal, we calculate the.0 × 10 −7 at the 90 % confidence level. This is an improvement by nearly an order of magnitude over the previously established limit. In addition, we set the first upper limits for the exclusive seven-pion decaysii We also study the τ − → 3π − 2π + π 0 ν τ mode and measure its branching ratio

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Section: Charged Track Candidatesmentioning

confidence: 99%