First Observation of {tau}{r_arrow}3{pi}{eta}{nu}{sub {tau}} and {tau}{r_arrow} {ital f}{sub 1}{pi}{nu}{sub {tau}} Decays

Journal Article · Sun Aug 31 20:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.2406· OSTI ID:628706

Bergfeld, T; Eisenstein, B I; Ernst, J; Gladding, G E; Gollin, G D; Hans, R M; Johnson, E; Karliner, I; Marsh, M A; Palmer, M; Selen, M; Thaler, J J ^[1]; Edwards, K W; Edwards, K W ^[2]; Bellerive, A; Bellerive, A; Janicek, R; Janicek, R; MacFarlane, D B; MacFarlane, D B ; Patel, P M; Patel, P M ^[2]; Sadoff, A J ^[3]; Ammar, R; Baringer, P; Bean, A; Besson, D; Coppage, D; Darling, C; Davis, R; Hancock, N; Kotov, S; Kravchenko, I; Kwak, N ^[4]; Anderson, S; Kubota, Y; Lee, S J; ONeill, J J; Patton, S; Poling, R; Riehle, T; Savinov, V; Smith, A ^[5]; Alam, M S; Athar, S B; Ling, Z; Mahmood, A H; Severini, H; Timm, S; Wappler, F ^[6]; Anastassov, A; Blinov, S; Duboscq, J E; Fujino, D; Gan, K K; Hart, T; Honscheid, K; Kagan, H; Kass, R; Lee, J; Spencer, M B; Sung, M; Undrus, A; Wanke, R; Wolf, A; Zoeller, M M ^[7]; Nemati, B; Richichi, S J; Ross, W R; Skubic, P ^[8]; Bishai, M; Fast, J; Gerndt, E; Hinson, J W; Menon, N; Miller, D H; Shibata, E I; Shipsey, I P; Yurko, M ^[9]; Gibbons, L; Glenn, S; Johnson, S D; Kwon, Y; Roberts, S; Thorndike, E H ^[10]; Jessop, C P; Lingel, K; Marsiske, H; Perl, M L; Ugolini, D; Wang, R; Zhou, X; others, and

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1. University of Illinois, Champaign-Urbana, Illinois 61801 (United States)
2. the Institute of Particle Physics, Montreal, Quebec (Canada)
3. Ithaca College, Ithaca, New York 14850 (United States)
4. University of Kansas, Lawrence, Kansas 66045 (United States)
5. University of Minnesota, Minneapolis, Minnesota 55455 (United States)
6. State University of New York at Albany, Albany, New York 12222 (United States)
7. The Ohio State University, Columbus, Ohio 43210 (United States)
8. University of Oklahoma, Norman, Oklahoma 73019 (United States)
9. Purdue University, West Lafayette, Indiana 47907 (United States)
10. University of Rochester, Rochester, New York 14627 (United States)

We have observed new channels for {tau} decays with an {eta} in the final state. We study 3-prong tau decays, using the {eta}{r_arrow}{gamma}{gamma} and {eta}{r_arrow}3{pi}{sup 0} decay modes and 1-prong decays with two {pi}{sup 0} {close_quote}s using the {eta}{r_arrow}{gamma}{gamma} channel. The measured branching fractions are B({tau}{sup {minus}}{r_arrow}{pi}{sup {minus}} {pi}{sup {minus}}{pi}{sup +}{eta}{nu}{sub {tau}})=(3.4{sup +0.6}{sub {minus}0.5} {plus_minus}0.6){times}10{sup {minus}4} and B({tau}{sup {minus}}{r_arrow}{pi}{sup {minus}} 2{pi}{sup 0}{eta}{nu}{sub {tau}}) =(1.4{plus_minus}0.6{plus_minus}0.3){times}10{sup {minus}4} . We observe clear evidence for f{sub 1}{r_arrow}{eta}{pi}{pi} substructure and measure B({tau}{sup {minus}}{r_arrow}f{sub 1}{pi}{sup {minus}}{nu}{sub {tau}})=(5.8{sup +1.4 }{sub {minus}1.3}{plus_minus}1.8){times}10{sup {minus}4} . We have also searched for {eta}{sup {prime}}(958) production and obtain 90{percent} C.L.upper limits B({tau}{sup {minus}}{r_arrow}{pi}{sup {minus}} {eta}{sup {prime}}{nu}{sub {tau}}){lt} 7.4{times}10{sup {minus}5} and B({tau}{sup {minus}}{r_arrow}{pi}{sup {minus}} {pi}{sup 0}{eta}{sup {prime}}{nu}{sub {tau} }){lt}8.0{times}10{sup {minus}5} . {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 628706
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BRANCHING RATIO
GLUONS
HIGGS BOSONS
PARTICLE PRODUCTION
TAU PARTICLES
WEAK HADRONIC DECAY