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Search for anomalous weak dipole moments of the $\tau$ lepton

A. Heister S. Schael R. Barate 1 I. de Bonis 1 D. Decamp 1 C. Goy 1 J P. Lees 1 E. Merle 1 M N. Minard 1 B. Pietrzyk 1 S. Bravo M P. Casado M. Chmeissani J M. Crespo E. Fernandez M. Fernandez-Bosman L. Garrido M. Martinez A. Pacheco H. Ruiz A. Colaleo D. Creanza M. de Palma G. Iaselli G. Maggi M. Maggi S. Nuzzo A. Ranieri G. Raso F. Ruggieri G. Selvaggi L. Silvestris P. Tempesta A. Tricomi G. Zito X. Huang Jiali Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang W. Zhao D. Abbaneo P. Azzurri O. Buchmuller M. Cattaneo F. Cerutti B. Clerbaux H. Drevermann R W. Forty M. Frank F. Gianotti J B. Hansen J. Harvey D E. Hutchcroft P. Janot B. Jost M. Kado P. Mato A. Moutoussi F. Ranjard L. Rolandi D. Schlatter O. Schneider G. Sguazzoni W. Tejessy F. Teubert A. Valassi I. Videau J. Ward F. Badaud 2 Alain Falvard 2 Pascal Gay 2 Pierre Henrard 2 J. Jousset 2 B. Michel 2 S. Monteil 2 Jean-Claude Montret 2 D. Pallin 2 Pascal Perret 2 J D. Hansen J R. Hansen P H. Hansen B S. Nilsson A. Kyriakis C. Markou E. Simopoulou A. Vayaki K. Zachariadou A. Blondel 3 G. Bonneaud 3 J C. Brient 3 A. Rouge 3 M. Rumpf 3 M. Swynghedauw 3 M. Verderi 3 H. Videau 3 V. Ciulli E. Focardi G. Parrini A. Antonelli M. Antonelli G. Bencivenni F. Bossi G. Capon V. Chiarella P. Laurelli G. Mannocchi G P. Murtas L. Passalacqua M. Pepe-Altarelli J G. Lynch P. Negus V. O'Shea C. Raine a S. Thompson S. Wasserbaech R. Cavanaugh C. Geweniger P. Hanke V. Hepp E E. Kluge A. Putzer H. Stenzel K. Tittel M. Wunsch R. Beuselinck D M. Binnie W. Cameron P J. Dornan M. Girone N. Marinelli J K. Sedgbeer J C. Thompson V M. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph E. Bouhova-Thacker C K. Bowdery a J. Finch F. Foster G. Hughes R W L. Jones M R. Pearson N A. Robertson K. Jakobs K. Kleinknecht B. Renk H G. Sander H. Wachsmuth C. Zeitnitz A. Bonissent 4 P. Coyle 4 O. Leroy 4 P. Payre 4 D. Rousseau 4 M. Talby 4 F. Ragusa A. David H. Dietl G. Ganis K. Huttmann G. Lutjens W. Manner H G. Moser R. Settles G. Wolf J. Boucrot 5 O. Callot 5 M. Davier 5 L. Duflot 5 J F. Grivaz 5 P. Heusse 5 A. Jacholkowska 5 J. Lefrancois 5 J J. Veillet 5 C. Yuan 5 G. Bagliesi T. Boccali L. Foa A. Giammanco A. Giassi F. Ligabue A. Messineo F. Palla G. Sanguinetti A. Sciaba R. Tenchini A. Venturi P G. Verdini G A. Blair G. Cowan M G. Green T. Medcalf A. Misiejuk J A. Strong P. Teixeira-Dias R W. Clifft T R. Edgecock P R. Norton I R. Tomalin B. Bloch-Devaux P. Colas E. Lancon M C. Lemaire E. Locci P. Perez J. Rander J P. Schuller B. Vallage N. Konstantinidis a M. Litke G. Taylor C N. Booth S. Cartwright F. Combley M H. Lehto L F. Thompson A. Bohrer S. Brandt C. Grupen A. Ngac G. Prange G. Giannini J E. Rothberg S R. Armstrong K. Berkelman K. Cranmer D P S. Ferguson Y. Gao S. Gonzales O J. Hayes H. Hu S. Jin J. Kile P A. Mcnamara Iii J. Nielsen y B. Pan J H. von Wimmersperg-Toller W. Wiedenmann J. Wu Lan. Wu Sau X. Wu G. Zobernig G. Dissertori
Abstract : The anomalous weak dipole moments of the $\tau$ lepton are measured in a data sample collected by ALEPH from 1990 to 1995 corresponding to an integrated luminosity of 155~pb$^{-1}$. Tau leptons produced in the reaction $e^+ e^- \rightarrow \tau^+ \tau^-$ at energies close to the ${\rm Z}$ mass are studied using their semileptonic decays to $\pi$, $\rho$, $a_1 \rightarrow \pi 2\pi^0$ or $a_1 \rightarrow 3 \pi$. The real and imaginary components of both the anomalous weak magnetic dipole moment and the CP-violating anomalous weak electric dipole moment, $ {\rm Re}\,\mu_{\tau}$, ${\rm Im}\,\mu_{\tau}$, ${\rm Re}\,d_{\tau}$ and ${\rm Im}\,d_{\tau}$, are measured simultaneously by means of a likelihood fit built from the full differential cross section. No evidence of new physics is found. The following bounds are obtained (95\% CL): $|{\rm Re}\, \mu_{\tau} | 1.14 \times 10^{-3}$, $|{\rm Im}\, \mu_{\tau} | 2.65 \times 10^{-3}$, $|{\rm Re}\, d_{\tau} | 0.91 \times 10^{-3}$, and $|{\rm Im}\, d_{\tau} | 2.01 \times 10^{-3}$.
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Submitted on : Monday, November 17, 2003 - 3:17:51 PM
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  • HAL Id : in2p3-00021505, version 1

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A. Heister, S. Schael, R. Barate, I. de Bonis, D. Decamp, et al.. Search for anomalous weak dipole moments of the $\tau$ lepton. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2003, 30, pp.291-304. ⟨in2p3-00021505⟩

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