MEASUREMENT OF THE BRANCHING FRACTION FOR TAU-]RHO-NU

Author(s): ABRAMS, GS; ALAM, MS; BLOCKER, CA; BOYARSKI, AM; BREIDENBACH, M; BURKE, DL; CARITHERS, WC; CHINOWSKY, W; COLES, MW; COOPER, S; COUCHMAN, B; DIETERLE, WE; DILLON, JB; DORENBOSCH, J; DORFAN, JM; EATON, MW; FELDMAN, GJ; FISCHER, HG; FRANKLIN, MEB; GIDAL, G; GOLDHABER, G; HANSON, G; HAYES, KG; HIMEL, T; HITLIN, DG; HOLLEBEEK, RJ; INNES, WR; JAROS, J; JENNI, P; JOHNSON, AD; KADYK, JA; LANKFORD, AJ; LARSEN, RR; LUTH, V; MARTIN, JF; MILLIKAN, RE; NELSON, ME; PANG, CY; PATRICK, JF; PERL, ML; RICHTER, B; SCHARRE, DL; SCHINDLER, RH; SCHWITTERS, RF; SHANNON, SR; SIEGRIST, JL; STRAIT, J; TAUREG, H; TONUTTI, M; TRILLING, GH; VELLA, EN; VIDAL, RA; VIDEAU, I; WEISS, JM; ZACCONE, H | Abstract: This Letter presents a measurement of the decay τ-→ρ-ντ using data obtained with the Mark II detector at SPEAR. In the center-of-mass energy region 4.5l~Ec.m.l~6.0 GeV 85 events are observed in which a charged ρ was found in coincidence with either an electron or a muon. It was determined that B(τ-→ρ-ντ)=(20.5±4.1)% and the ratio B(τ-→ρ-ντ)B(τ-→e-ντνe)=1.11± 0.23. © 1979 The American Physical Society.