Re-fit of τ Mass Based on Improved Theoretical Calculations

  • Recently many theoretical calculations have been made for the cross section of e+e→τ+τ near the threshold, the accuracy of which is up to 10-4. Based on one of the calculations, the e μ-contained final state data are refitted by utilizing the technique once adopted by BES collaboration for τ mass measurement. The systematic uncertainties are analyzed again and the final result of τ mass is 1776.98+0.44+0.12-0.51-0.13MeV.
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  • [1] . ALEPH Collaboration(Schael S et al.). Phys. Report, 2005,421: 1912. BES Collaboration(BAI J Z et al.). Phys. Rev. Lett., 1992,69: 30213. BES Collaboration(BAI J Z et al.). HEP NP, 1992, 16:343(in Chinese)(BES合作组(白景芝等).高能物理与核物理,1992, 16: 343)4. BES Collaboration(BAI J Z et al.). Phys. Rev., 1996, D53:205. Voloshin M B. Topics in Tau Physics at a Tau-Charm Factory, Univ. Minnesota Preprint TPI-MINN-89/33-T, 19896. CLEO-c Collaboration. CLEO-c and CESR-c: A New Frontier of Weak and Strong Interactions, CLNS 2001, 17427. CHEN H S. BEPC//BES0 Project. Talk at ICHEP 2002,Amsterdam, Holland, July 24-31, 20028. Voloshin M B. Phys. Lett., 2003, B556: 1539. Smith B H, Voloshin M B. Phys. Lett., 1994, B324: 177;Phys. Lett., 1994, B333: 564, Errata10. Pich A. Perspectives on Tau-Charm Factory Physics. Proceedings of the 3rd Workshop on the Tau-Charm Factory.Marbella, Spain, 1993. Edited by Kirkby J and Kirkby R(Editions Frontieres, Gif-sur-Yvette), 1994. 76711. Eidelman S et al.(Particle Data Group). Phys. Lett., 2004,B592: 813, 83012. Ruiz-Femenía P, Pich A. Phys. Rev., 2001, D64: 05300113. Schwinger J. Particles, Sorces and Fields. (Volume II). 197314. Berestetskii V B, Lifshits E M, Pitaevskii L P. QuantumElectrodynamics. Pergamon, 198215. Kuraev E A, Fadin V S. Sov. J. Nucl. Phys., 1985, 41: 466;Altarelli G, Martinelli G. CERN, 1986, 86-02: 47; Nicrosini O, Trentadue L. Phys. Lett., 1987, B196: 551; Berends FA, Burgers G, Neerven W L. Nucl. Phys., 1988, B297: 429;304: 92116. Berends F A, Gaemers K J F, Gastmans R. Nucl. Phys.,1973, B57: 381; Berends F A, Komen G J. Phys. Lett.,1976, B63: 43217. Rodrigo G, Pich A, Santamaria A. 1997, hep-ph/9707747418. WANG P, YUAN C Z, MO X H et al. Phys. Lett., 2004,B593: 8919. Hikasa K et al.(Particle Data Group). Phys. Rev., 1992,D45: 1644, 165620. James F. MINUIT Function Minimization and Error Analysis Reference Manual(Version 94.1). Geneva, Switzerland.CERN21. MO Xiao-Hu, ZHU Yong-Sheng. HEP NP, 2003, 27(6):474-478(in Chinese)(莫晓虎,朱永生.高能物理与核物理,2003, 27(6): 474-478)22. WANG You-Kai, MO Xiao-Hu, YUAN Chang-Zheng et al.Statistical Optimization of High Accurate Measurement of Mass
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WANG You-Kai, MO Xiao-Hu, YUAN Chang-Zheng and LIU Jue-Ping. Re-fit of τ Mass Based on Improved Theoretical Calculations[J]. Chinese Physics C, 2007, 31(4): 325-331.
WANG You-Kai, MO Xiao-Hu, YUAN Chang-Zheng and LIU Jue-Ping. Re-fit of τ Mass Based on Improved Theoretical Calculations[J]. Chinese Physics C, 2007, 31(4): 325-331. shu
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Received: 2006-07-25
Revised: 2006-09-12
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Re-fit of τ Mass Based on Improved Theoretical Calculations

    Corresponding author: WANG You-Kai,
  • Institute of High Energy Physics, CAS, Beijing 100049, China2 School of Physics Science and Technology, Wuhan University, Wuhan 430072, China

Abstract: Recently many theoretical calculations have been made for the cross section of e+e→τ+τ near the threshold, the accuracy of which is up to 10-4. Based on one of the calculations, the e μ-contained final state data are refitted by utilizing the technique once adopted by BES collaboration for τ mass measurement. The systematic uncertainties are analyzed again and the final result of τ mass is 1776.98+0.44+0.12-0.51-0.13MeV.

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