Final tau-neutrino results from the DONuT experiment

Abstract

References (21)

No Citing Articles

Download: PDF (655 kB) or Buy this Article (US$25) (Use Article Pack)

K. Kodama,¹ N. Ushida,¹ C. Andreopoulos,² N. Saoulidou,² G. Tzanakos,² P. Yager,³ B. Baller,⁴ D. Boehnlein,⁴ W. Freeman,⁴ B. Lundberg,⁴ J. Morfin,⁴ R. Rameika,⁴ S. H. Chung,⁵ J. S. Song,⁵ C. S. Yoon,⁵ P. Berghaus,⁶ M. Kubantsev,⁶ N. W. Reay,⁶ R. Sidwell,⁶ N. Stanton,⁶ S. Yoshida,⁶ S. Aoki,⁷ T. Hara,⁷ J. T. Rhee,⁸ D. Ciampa,⁹ C. Erickson,⁹ M. Graham,⁹ E. Maher,⁹ K. Heller,⁹ R. Rusack,⁹ R. Schwienhorst,⁹ J. Sielaff,⁹ J. Trammell,⁹ J. Wilcox,⁹ T. Furukawa,¹⁰ K. Hoshino,¹⁰ H. Jiko,¹⁰ M. Komatsu,¹⁰ M. Nakamura,¹⁰ T. Nakano,¹⁰ K. Niwa,¹⁰ N. Nonaka,¹⁰ K. Okada,¹⁰ B. D. Park,¹⁰ O. Sato,¹⁰ S. Takahashi,¹⁰ V. Paolone,¹¹ C. Rosenfeld,¹² A. Kulik,^11,12 T. Kafka,¹³ W. Oliver,¹³ T. Patzak,¹³ and J. Schneps¹³

(DONuT Collaboration)

¹Aichi University of Education, Kariya 441-8522, Japan
²University of Athens, Athens 15771, Greece
³University of California/Davis, Davis, California 95616, USA
⁴Fermilab, Batavia, Illinois 60510, USA
⁵Gyeongsang University, Chiju, 660-701 Korea
⁶Kansas State University, Manhattan, Kansas 66506, USA
⁷Kobe University, Kobe 657-8501, Japan
⁸Kon-kuk University, Seoul, 143-701 Korea
⁹University of Minnesota, Minneapolis, Minnesota 55455, USA
¹⁰Nagoya University, Nagoya 464-8602, Japan
¹¹University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
¹²University of South Carolina, Columbia, South Carolina 29208, USA
¹³Tufts University, Medford, Massachusetts 02155, USA

Received 22 November 2007; published 11 September 2008

TheDONuT experiment collected data in 1997 and published first resultsin 2000 based on four observed nu_tau charged-current (CC) interactions.The final analysis of the data collected in the experimentis presented in this paper, based on 3.6×10¹⁷ protons ontarget using the 800 GeV Tevatron beam at Fermilab. The numberof observed nu_tau CC events is 9 with an estimatedbackground of 1.5 events, from a total of 578 observedneutrino interactions. We calculate the nu_tau CC cross section asa function of one parameter. Assuming D_s mesons are thesole source for nu_tau, the energy-independent part of the totalCC cross section can be parametrized as sigma^const(nu_tau)=2.51n^1.52×10^-40 cm² GeV^-1 for n>=4,where n is the parameter controlling the longitudinal part ofthe D_s differential cross section of the form dsigma/dx_F[proportional](1-|x_F|)ⁿ. Theanalysis could not distinguish between nu_tau and [overline nu ]_tau. The valueof n obtained from Pythia simulations, n=6.1, gives an estimatedvalue of sigma^const(nu_tau)=(0.39±0.13±0.13)×10^-38 cm² GeV^-1.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.78.052002
DOI:	10.1103/PhysRevD.78.052002
PACS:	14.60.Lm; 02.50.Sk; 13.25.Ft; 13.35.Dx 14.60.Lm Ordinary neutrinos (ν_e, ν_μ, ν_τ) 02.50.Sk Multivariate analysis 13.25.Ft Hadronic decays of charmed mesons 13.35.Dx Decays of taus YEAR: 2008