tau - Particle Data Group

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Citation: K. Nakamura et al. (Particle Data Group), JP G 37, 075021 (2010) and 2011 partial update for the 2012 edition (URL: http://pdg.lbl.gov) 1 INAMI 03 use e + e − → τ + τ − events. 2 GROZIN 09A calculate the contribution to the electron electric dipole moment from the τ electric dipole moment appearing in loops, which is Δd e =6.9 × 10 −12 d τ . Dividing the REGAN 02 upper limit ∣ ∣ ∣d e ≤ 1.6 × 10 −27 e cm at CL=90% by 6.9 × 10 −12 gives this limit. 3 ABDALLAH 04K limit is derived from e + e − → e + e − τ + τ − total cross-section measurements at √ s between 183 and 208 GeV and is on the absolute value of d τ . 4 ACHARD 04G limit is derived from e + e − → e + e − τ + τ − total cross-section measurements at √ s between 189 and 206 GeV, and is on the absolute value of d τ . 5 ALBRECHT 00 use e + e − → τ + τ − events. Limit is on the absolute value of Re(dτ ). 6 ACKERSTAFF 98N use Z → τ + τ − γ events. The limit applies to an average of the form factor for off-shell τ’s having p 2 ranging from m 2 τ to (M Z –m τ )2 . 7 ∣ ∣ ∣ ESCRIBANO 97 derive the relationship ∣dτ =cotθW ∣d W ∣ using effective Lagrangian τ methods, and use a conference result ∣ ∣ d W < 5.8×10 −18 e cm at 95% CL (L. Silvestris, τ ICHEP96) to obtain this result. 8 ESCRIBANO 97 use preliminary experimental results. 9 ESCRIBANO 93 limit derived from Γ(Z → τ + τ − ), and is on the absolute value of the electric dipole moment. Im(d τ ) VALUE (10 −16 e cm) CL% DOCUMENT ID TECN COMMENT −0.25 to 0.008 95 1 INAMI 03 BELL E ee cm = 10.6 GeV •••We do not use the following data for averages, fits, limits, etc. ••• < 1.8 95 2 ALBRECHT 00 ARG E ee cm =10.4 GeV 1 INAMI 03 use e + e − → τ + τ − events. 2 ALBRECHT 00 use e + e − → τ + τ − events. Limit is on the absolute value of Im(dτ ). Re(dw w τ ) τ WEAK DIPOLE MOMENT (dw w τ ) A nonzero value is forbidden by CP invariance. The q 2 dependence is expected to be small providing no thresholds are nearby. VALUE (10 −17 e cm) CL% DOCUMENT ID TECN COMMENT

Citation: K. Nakamura et al. (Particle Data Group), JP G 37, 075021 (2010) and 2011 partial update for the 2012 edition (URL: http://pdg.lbl.gov) Im(dw w τ ) VALUE (10 −17 e cm) CL% DOCUMENT ID TECN COMMENT

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