Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma

N. Shimizu; H. Aihara; D. Epifanov; I. Adachi; S. Al Said; D. M. Asner; V. Aulchenko; T. Aushev; R. Ayad; V. Babu; I. Badhrees; A. M. Bakich; V. Bansal; E. Barberio; V. Bhardwaj; B. Bhuyan; J. Biswal; A. Bobrov; A. Bozek; M. Bracko; T. E. Browder; D. Cervenkov; M. -C. Chang; P. Chang; V. Chekelian; A. Chen; B. G. Cheon; K. Chilikin; K. Cho; S. -K. Choi; Y. Choi; D. Cinabro; T. Czank; N. Dash; S. Di Carlo; Z. Dolezal; D. Dutta; S. Eidelman; J. E. Fast; T. Ferber; B. G. Fulsom; R. Garg; V. Gaur; N. Gabyshev; A. Garmash; M. Gelb; P. Goldenzweig; D. Greenwald; E. Guido; J. Haba; K. Hayasaka; H. Hayashii; M. T. Hedges; S. Hirose; W. -S. Hou; T. Iijima; K. Inami; G. Inguglia; A. Ishikawa; R. Itoh; M. Iwasaki; I. Jaegle; H. B. Jeon; S. Jia; Y. Jin; K. K. Joo; T. Julius; K. H. Kang; G. Karyan; T. Kawasaki; C. Kiesling; D. Y. Kim; J. B. Kim; S. H. Kim; Y. J. Kim; K. Kinoshita; P. Kodys; S. Korpar; D. Kotchetkov; P. Krizan; R. Kroeger; P. Krokovny; R. Kulasiri; A. Kuzmin; Y. -J. Kwon; J. S. Lange; I. S. Lee; L. K. Li; Y. Li; L. Li Gioi; J. Libby; D. Liventsev; M. Masuda; M. Merola; K. Miyabayashi; H. Miyata; G. B. Mohanty; H. K. Moon; T. Mori; R. Mussa; E. Nakano; M. Nakao; T. Nanut; K. J. Nath; Z. Natkaniec; M. Nayak; M. Niiyama; N. K. Nisar; S. Nishida; S. Ogawa; S. Okuno; H. Ono; G. Pakhlova; B. Pal; C. W. Park; H. Park; S. Paul; T. K. Pedlar; R. Pestotnik; L. E. Piilonen; V. Popov; M. Ritter; A. Rostomyan; Y. Sakai; M. Salehi; S. Sandilya; Y. Sato; V. Savinov; O. Schneider; G. Schnell; C. Schwanda; Y. Seino; K. Senyo; M. E. Sevior; V. Shebalin; T. -A. Shibata; J. -G. Shiu; B. Shwartz; A. Sokolov; E. Solovieva; M. Staric; J. F. Strube; K. Sumisawa; T. Sumiyoshi; U. Tamponi; K. Tanida; F. Tenchini; K. Trabelsi; M. Uchida; T. Uglov; Y. Unno; S. Uno; Y. Usov; C. Van Hulse; G. Varner; V. Vorobyev; A. Vossen; C. H. Wang; M. -Z. Wang; P. Wang; M. Watanabe; E. Widmann; E. Won; Y. Yamashita; H. Ye; C. Z. Yuan; Z. P. Zhang; V. Zhilich; V. Zhukova; V. Zhulanov; A. Zupanc

doi:10.1093/ptep/pty003

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Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma

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Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma

N. Shimizu, H. Aihara, D. Epifanov, I. Adachi, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, …

Progress of theoretical and experimental physics, Vol.2018(2)

01/02/2018

DOI: https://doi.org/10.1093/ptep/pty003

Abstract

Physical Sciences

Physics

Physics, Multidisciplinary

Physics, Particles & Fields

Science & Technology

We present a measurement of the Michel parameters of the tau lepton, (eta) over bar and xi kappa, in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu) over bar (l)gamma using 711 fb(-1) of collision data collected with the Belle detector at the KEKB e(+)e(-) collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of e(+)e(-) -> tau(+)tau(-) -> (pi(+)pi(0)(nu) over bar (tau))(l(-)nu(tau)(nu) over bar (l)gamma) (l = e or mu). The measured values of the Michel parameters are (eta) over bar = - 1.3 +/- 1.5 +/- 0.8 and xi kappa = 0.5 +/- 0.4 +/- 0.2, where the first error is statistical and the second is systematic. This is the first measurement of these parameters. These results are consistent with the Standard Model predictions within their uncertainties, and constrain the coupling constants of the generalized weak interaction.

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Title: Measurement of the tau Michel parameters (eta)over-bar and xi kappa in the radiative leptonic decay tau(-) -> l(-)nu(tau)(nu)over-bar(l)gamma
Creators - without role: N. Shimizu - The University of Tokyo
H. Aihara - The University of Tokyo
D. Epifanov - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
I. Adachi - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
S. Al Said - University of Tabuk
D. M. Asner - Pacific Northwest Natl Lab, Richland, WA 99352 USA
V. Aulchenko - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
T. Aushev - Moscow Inst Phys & Technol, Moscow 141700, Moscow Region, Russia
R. Ayad - University of Tabuk
V. Babu - Tata Institute of Fundamental Research
I. Badhrees - University of Tabuk
A. M. Bakich - University of Sydney
V. Bansal - Pacific Northwest Natl Lab, Richland, WA 99352 USA
E. Barberio - University of Melbourne
V. Bhardwaj - Indian Inst Sci Educ & Res Mohali, Sas Nagar 140306, India
B. Bhuyan - Indian Institute of Technology Guwahati
J. Biswal - J Stefan Inst, Ljubljana 1000, Slovenia
A. Bobrov - Novosibirsk State University
A. Bozek - H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
M. Bracko - J Stefan Inst, Ljubljana 1000, Slovenia
T. E. Browder - University of Hawaii System
D. Cervenkov - Charles University
M. -C. Chang - Fu Jen Catholic University
P. Chang - Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan
V. Chekelian - Max
A. Chen - Natl Cent Univ, Chungli 32054, Taiwan
B. G. Cheon - Hanyang University
K. Chilikin - Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia
K. Cho - Korea Inst Sci & Technol Informat, Daejeon 305806, South Korea
S. -K. Choi - Gyeongsang Natl Univ, Chinju 660701, South Korea
Y. Choi - Sungkyunkwan University
D. Cinabro - Wayne State University
T. Czank - Tohoku University
N. Dash - Indian Institute of Technology Bhubaneswar
S. Di Carlo - Wayne State University
Z. Dolezal - Charles University
D. Dutta - Tata Institute of Fundamental Research
S. Eidelman - Max
J. E. Fast - Pacific Northwest Natl Lab, Richland, WA 99352 USA
T. Ferber - DESY, D-22607 Hamburg, Germany
B. G. Fulsom - Pacific Northwest Natl Lab, Richland, WA 99352 USA
R. Garg - Panjab University
V. Gaur - Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
N. Gabyshev - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
A. Garmash - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
M. Gelb - Karlsruher Inst Technol, Inst Expt Kernphys, D-76131 Karlsruhe, Germany
P. Goldenzweig - Karlsruher Inst Technol, Inst Expt Kernphys, D-76131 Karlsruhe, Germany
D. Greenwald - Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
E. Guido - INFN, Sez Torino, I-10125 Turin, Italy
J. Haba - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
K. Hayasaka - Niigata University
H. Hayashii - Nara Womens Univ, Nara 6308506, Japan
M. T. Hedges - University of Hawaii System
S. Hirose - Nagoya University
W. -S. Hou - Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan
T. Iijima - Nagoya University
K. Inami - Nagoya University
G. Inguglia - DESY, D-22607 Hamburg, Germany
A. Ishikawa - Tohoku University
R. Itoh - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
M. Iwasaki - Osaka City University
I. Jaegle - Univ Florida, Gainesville, FL 32611 USA
H. B. Jeon - Kyungpook Natl Univ, Daegu 702701, South Korea
S. Jia - Beihang University
Y. Jin - The University of Tokyo
K. K. Joo - Chonnam Natl Univ, Kwangju 660701, South Korea
T. Julius - University of Melbourne
K. H. Kang - Kyungpook Natl Univ, Daegu 702701, South Korea
G. Karyan - DESY, D-22607 Hamburg, Germany
T. Kawasaki - Niigata University
C. Kiesling - Max
D. Y. Kim - Soongsil University
J. B. Kim - University of Seoul
S. H. Kim - Hanyang University
Y. J. Kim - Korea Inst Sci & Technol Informat, Daejeon 305806, South Korea
K. Kinoshita - University of Cincinnati
P. Kodys - Charles University
S. Korpar - J Stefan Inst, Ljubljana 1000, Slovenia
D. Kotchetkov - University of Hawaii System
P. Krizan - J Stefan Inst, Ljubljana 1000, Slovenia
R. Kroeger - University of Mississippi
P. Krokovny - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
R. Kulasiri - Kennesaw State University
A. Kuzmin - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
Y. -J. Kwon - Yonsei University
J. S. Lange - University of Giessen
I. S. Lee - Hanyang University
L. K. Li - Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
Y. Li - Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
L. Li Gioi - Max
J. Libby - Indian Institute of Technology Madras
D. Liventsev - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
M. Masuda - The University of Tokyo
M. Merola - INFN, Sez Napoli, I-80126 Naples, Italy
K. Miyabayashi - Nara Womens Univ, Nara 6308506, Japan
H. Miyata - Niigata University
G. B. Mohanty - Tata Institute of Fundamental Research
H. K. Moon - University of Seoul
T. Mori - Nagoya University
R. Mussa - INFN, Sez Torino, I-10125 Turin, Italy
E. Nakano - Osaka City University
M. Nakao - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
T. Nanut - J Stefan Inst, Ljubljana 1000, Slovenia
K. J. Nath - Indian Institute of Technology Guwahati
Z. Natkaniec - H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
M. Nayak - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
M. Niiyama - Kyoto University
N. K. Nisar - University of Pittsburgh
S. Nishida - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
S. Ogawa - Toho University
S. Okuno - Kanagawa University
H. Ono - Niigata University
G. Pakhlova - Moscow Inst Phys & Technol, Moscow 141700, Moscow Region, Russia
B. Pal - University of Cincinnati
C. W. Park - Sungkyunkwan University
H. Park - Kyungpook Natl Univ, Daegu 702701, South Korea
S. Paul - Tech Univ Munich, Dept Phys, D-85748 Garching, Germany
T. K. Pedlar - Luther Coll, Decorah, IA 52101 USA
R. Pestotnik - J Stefan Inst, Ljubljana 1000, Slovenia
L. E. Piilonen - Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
V. Popov - Moscow Inst Phys & Technol, Moscow 141700, Moscow Region, Russia
M. Ritter - Ludwig Maximilians Univ Munchen, D-80539 Munich, Germany
A. Rostomyan - DESY, D-22607 Hamburg, Germany
Y. Sakai - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
M. Salehi - Ludwig Maximilians Univ Munchen, D-80539 Munich, Germany
S. Sandilya - University of Cincinnati
Y. Sato - Nagoya University
V. Savinov - University of Pittsburgh
O. Schneider - Ecole Polytech Fed Lausanne, CH-1015 Lausanne, Switzerland
G. Schnell - University of the Basque Country
C. Schwanda - Inst High Energy Phys, A-1050 Vienna, Austria
Y. Seino - Niigata University
K. Senyo - Yamagata University
M. E. Sevior - University of Melbourne
V. Shebalin - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
T. -A. Shibata - Tokyo Institute of Technology
J. -G. Shiu - Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan
B. Shwartz - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
A. Sokolov - Inst High Energy Phys, Protvino 142281, Russia
E. Solovieva - Moscow Inst Phys & Technol, Moscow 141700, Moscow Region, Russia
M. Staric - J Stefan Inst, Ljubljana 1000, Slovenia
J. F. Strube - Pacific Northwest Natl Lab, Richland, WA 99352 USA
K. Sumisawa - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
T. Sumiyoshi - Tokyo Metropolitan University
U. Tamponi - INFN, Sez Torino, I-10125 Turin, Italy
K. Tanida - Japan Atom Energy Agcy, Adv Sci Res Ctr, Naka, Ibaraki 3191195, Japan
F. Tenchini - University of Melbourne
K. Trabelsi - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
M. Uchida - Tokyo Institute of Technology
T. Uglov - Moscow Inst Phys & Technol, Moscow 141700, Moscow Region, Russia
Y. Unno - Hanyang University
S. Uno - High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan
Y. Usov - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
C. Van Hulse - University of the Basque Country
G. Varner - University of Hawaii System
V. Vorobyev - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
A. Vossen - Indiana University Bloomington
C. H. Wang - Natl United Univ, Miao Li 36003, Peoples R China
M. -Z. Wang - Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan
P. Wang - Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
M. Watanabe - Niigata University
E. Widmann - Meyer
E. Won - University of Seoul
Y. Yamashita - Nippon Dent Univ, Niigata 9518580, Japan
H. Ye - DESY, D-22607 Hamburg, Germany
C. Z. Yuan - Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
Z. P. Zhang - Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
V. Zhilich - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
V. Zhukova - Russian Acad Sci, PN Lebedev Phys Inst, Moscow 119991, Russia
V. Zhulanov - RAS, Budker Inst Nucl Phys, SB, Novosibirsk 630090, Russia
A. Zupanc - J Stefan Inst, Ljubljana 1000, Slovenia
Publication Details: Progress of theoretical and experimental physics, Vol.2018(2)
Publisher: Oxford Univ Press
Number of pages: 26
Grant note: 17J02178 / Grants-in-Aid for Scientific Research; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT); Japan Society for the Promotion of Science; Grants-in-Aid for Scientific Research (KAKENHI) SCOAP3
Identifiers: 9918646708331
Academic Unit: King Abdulaziz City for Science & Technology; University of Tabuk; King Abdullah University of Science & Technology
Language: English
Resource Type: Journal article