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An investigation of $D^{+} \to τ^{+} ν$

P. Rubin¹, C. Cawlfield², B. I. Eisenstein², I. Karliner², D. Kim², N. Lowrey², P. Naik², C. Sedlack², M. Selen² et al. (CLEO Collaboration)

M. Selen², E. J. White², J. Wiss², M. R. Shepherd³, D. Besson⁴, T. K. Pedlar⁵, D. Cronin-Hennessy⁶, K. Y. Gao⁶, D. T. Gong⁶, J. Hietala⁶, Y. Kubota⁶, T. Klein⁶, B. W. Lang⁶, R. Poling⁶, A. W. Scott⁶, A. Smith⁶, S. Dobbs⁷, Z. Metreveli⁷, K. K. Seth⁷, A. Tomaradze⁷, P. Zweber⁷, J. Ernst⁸, H. Severini⁹, S. A. Dytman¹⁰, W. Love¹⁰, V. Savinov¹⁰, O. Aquines¹¹, Z. Li¹¹, A. Lopez¹¹, S. Mehrabyan¹¹, H. Mendez¹¹, J. Ramirez¹¹, G. S. Huang¹², D. H. Miller¹², V. Pavlunin¹², B. Sanghi¹², I. P. J. Shipsey¹², B. Xin¹², G. S. Adams¹³, M. Anderson¹³, J. P. Cummings¹³, I. Danko¹³, J. Napolitano¹³, Q. He¹⁴, J. Insler¹⁴, H. Muramatsu¹⁴, C. S. Park¹⁴, E. H. Thorndike¹⁴, T. E. Coan¹⁵, Y. S. Gao¹⁵, F. Liu¹⁵, M. Artuso¹⁶, S. Blusk¹⁶, J. Butt¹⁶, J. Li¹⁶, N. Menaa¹⁶, R. Mountain¹⁶, S. Nisar¹⁶, K. Randrianarivony¹⁶, R. Redjimi¹⁶, R. Sia¹⁶, T. Skwarnicki¹⁶, S. Stone¹⁶, J. C. Wang¹⁶, K. Zhang¹⁶, S. E. Csorna¹⁷, G. Bonvicini¹⁸, D. Cinabro¹⁸, M. Dubrovin¹⁸, A. Lincoln¹⁸, D. M. Asner¹⁹, K. W. Edwards¹⁹, R. A. Briere²⁰, I. Brock²⁰, J. Chen²⁰, T. Ferguson²⁰, G. Tatishvili²⁰, H. Vogel²⁰, M. E. Watkins²⁰, J. L. Rosner²¹, N. E. Adam²², J. P. Alexander²², K. Berkelman²², D. G. Cassel²², J. E. Duboscq²², K. M. Ecklund²², R. Ehrlich²², L. Fields²², L. Gibbons²², R. Gray²², S. W. Gray²², D. L. Hartill²², B. K. Heltsley²², D. Hertz²², C. D. Jones²², J. Kandaswamy²², D. L. Kreinick²², V. E. Kuznetsov²², H. Mahlke-Krüger²², T. O. Meyer²², P. U. E. Onyisi²², J. R. Patterson²², D. Peterson²², J. Pivarski²², D. Riley²², A. Ryd²², A. J. Sadoff²², H. Schwarthoff²², X. Shi²², S. Stroiney²², W. M. Sun²², T. Wilksen²², M. Weinberger²², S. B. Athar²³, R. Patel²³, V. Potlia²³, H. Stoeck²³, and J. Yelton²³ (CLEO Collaboration)

¹George Mason University, Fairfax, Virginia 22030, USA
²University of Illinois, Urbana-Champaign, Illinois 61801, USA
³Indiana University, Bloomington, Indiana 47405, USA
⁴University of Kansas, Lawrence, Kansas 66045, USA
⁵Luther College, Decorah, Iowa 52101, USA
⁶University of Minnesota, Minneapolis, Minnesota 55455, USA
⁷Northwestern University, Evanston, Illinois 60208, USA
⁸State University of New York at Albany, Albany, New York 12222, USA
⁹University of Oklahoma, Norman, Oklahoma 73019, USA
¹⁰University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
¹¹University of Puerto Rico, Mayaguez, Puerto Rico 00681
¹²Purdue University, West Lafayette, Indiana 47907, USA
¹³Rensselaer Polytechnic Institute, Troy, New York 12180, USA
¹⁴University of Rochester, Rochester, New York 14627, USA
¹⁵Southern Methodist University, Dallas, Texas 75275, USA
¹⁶Syracuse University, Syracuse, New York 13244, USA
¹⁷Vanderbilt University, Nashville, Tennessee 37235, USA
¹⁸Wayne State University, Detroit, Michigan 48202, USA
¹⁹Carleton University, Ottawa, Ontario, Canada K1S 5B6
²⁰Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
²¹Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
²²Cornell University, Ithaca, New York 14853, USA
²³University of Florida, Gainesville, Florida 32611, USA

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Phys. Rev. D 73, 112005 – Published 9 June, 2006

DOI: https://doi.org/10.1103/PhysRevD.73.112005

Abstract

We test whether or not the $τ$ lepton manifests the same couplings as the $μ$ lepton by investigating the relative decay rates in purely leptonic $D^{+}$ meson decays. We use $281 {pb}^{- 1}$ of data accumulated at the $ψ (3770)$ resonance with the CLEO-c detector, to limit $B (D^{+} \to τ^{+} ν) < 2.1 \times 10^{- 3}$ at 90% confidence level (C.L.), thus allowing us to place the first upper limit on the ratio $R = Γ (D^{+} \to τ^{+} ν) / Γ (D^{+} \to μ^{+} ν)$ . The ratio of $R$ to the standard model expectation of 2.65 then is $< 1.8$ at 90% C.L., consistent with the prediction of lepton universality.

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References (15)

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Physical Review D

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An investigation of $D^{+} \to τ^{+} ν$

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An investigation of D+→τ+ν

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An investigation of $D^{+} \to τ^{+} ν$