High-statistics study of the τ-→π-π0ντ decay

M. Fujikawa, H. Hayashii, S. Eidelman, I. Adachi, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, A. M. Bakich, V. Balagura, E. Barberio, A. Bay, I. Bedny, K. Belous, V. Bhardwaj, U. Bitenc, A. Bondar, M. Bračko, J. Brodzicka, T. E. Browder & 134 others P. Chang, Y. Chao, A. Chen, B. G. Cheon, R. Chistov, I. S. Cho, Y. Choi, J. Dalseno, M. Dash, D. Epifanov, N. Gabyshev, B. Golob, H. Ha, J. Haba, K. Hara, Y. Hasegawa, K. Hayasaka, M. Hazumi, D. Heffernan, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwabuchi, M. Iwasaki, D. H. Kah, H. Kaji, S. U. Kataoka, T. Kawasaki, H. Kichimi, H. O. Kim, S. K. Kim, Y. I. Kim, Y. J. Kim, S. Korpar, P. Križan, P. Krokovny, R. Kumar, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, J. S. Lange, M. J. Lee, S. E. Lee, A. Limosani, C. Liu, Y. Liu, D. Liventsev, J. MacNaughton, F. Mandl, A. Matyja, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, G. R. Moloney, T. Mori, Y. Nagasaka, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, T. Ohshima, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, G. Pakhlova, H. Palka, C. W. Park, H. Park, H. K. Park, L. S. Peak, R. Pestotnik, L. E. Piilonen, A. Poluektov, H. Sahoo, Y. Sakai, O. Schneider, A. J. Schwartz, R. Seidl, A. Sekiya, K. Senyo, M. E. Sevior, M. Shapkin, V. Shebalin, C. P. Shen, J. G. Shiu, B. Shwartz, J. B. Singh, A. Sokolov, S. Stanič, M. Starič, T. Sumiyoshi, F. Takasaki, N. Tamura, M. Tanaka, G. N. Taylor, Y. Teramoto, K. Trabelsi, T. Tsuboyama, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, K. Vervink, A. Vinokurova, C. H. Wang, P. Wang, X. L. Wang, Y. Watanabe, Eunil Won, Y. Yamashita, M. Yamauchi, C. Z. Yuan, C. C. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova

Research output: Contribution to journalArticle

142 Citations (Scopus)

Abstract

We report a high-statistics measurement of the branching fraction for τ-→π-π0ντ and the invariant mass spectrum of the produced π-π0 system using 72.2fb-1 of data recorded with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fraction obtained is (25.24±0.01±0.39)%, where the first error is statistical and the second is systematic. The unfolded π-π0 mass spectrum is used to determine resonance parameters for the ρ(770), ρ′(1450), and ρ′′(1700) mesons. We also use this spectrum to estimate the hadronic (2π) contribution to the anomalous magnetic moment of the muon (aμππ). Our result for aμππ integrated over the mass range s=2mπ-1.8GeV/c2 is aμππ=(523.5±1.5(exp)±2.6(Br) ±2.5(isospin))×10-10, where the first error is due to the experimental uncertainties, the second is due to the uncertainties in the branching fractions, and the third is due to the uncertainties in the isospin-violating corrections.

Original languageEnglish
Article number072006
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume78
Issue number7
DOIs
Publication statusPublished - 2008 Oct 28

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statistics
mass spectra
decay
muons
mesons
magnetic moments
detectors
estimates
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Fujikawa, M., Hayashii, H., Eidelman, S., Adachi, I., Aihara, H., Arinstein, K., ... Zyukova, O. (2008). High-statistics study of the τ-→π-π0ντ decay. Physical Review D - Particles, Fields, Gravitation and Cosmology, 78(7), [072006]. https://doi.org/10.1103/PhysRevD.78.072006

High-statistics study of the τ-→π-π0ντ decay. / Fujikawa, M.; Hayashii, H.; Eidelman, S.; Adachi, I.; Aihara, H.; Arinstein, K.; Aulchenko, V.; Aushev, T.; Bakich, A. M.; Balagura, V.; Barberio, E.; Bay, A.; Bedny, I.; Belous, K.; Bhardwaj, V.; Bitenc, U.; Bondar, A.; Bračko, M.; Brodzicka, J.; Browder, T. E.; Chang, P.; Chao, Y.; Chen, A.; Cheon, B. G.; Chistov, R.; Cho, I. S.; Choi, Y.; Dalseno, J.; Dash, M.; Epifanov, D.; Gabyshev, N.; Golob, B.; Ha, H.; Haba, J.; Hara, K.; Hasegawa, Y.; Hayasaka, K.; Hazumi, M.; Heffernan, D.; Hoshi, Y.; Hou, W. S.; Hyun, H. J.; Iijima, T.; Inami, K.; Ishikawa, A.; Ishino, H.; Itoh, R.; Iwabuchi, M.; Iwasaki, M.; Kah, D. H.; Kaji, H.; Kataoka, S. U.; Kawasaki, T.; Kichimi, H.; Kim, H. O.; Kim, S. K.; Kim, Y. I.; Kim, Y. J.; Korpar, S.; Križan, P.; Krokovny, P.; Kumar, R.; Kuzmin, A.; Kwon, Y. J.; Kyeong, S. H.; Lange, J. S.; Lee, M. J.; Lee, S. E.; Limosani, A.; Liu, C.; Liu, Y.; Liventsev, D.; MacNaughton, J.; Mandl, F.; Matyja, A.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Moloney, G. R.; Mori, T.; Nagasaka, Y.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Noguchi, S.; Nozaki, T.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Ozaki, H.; Pakhlov, P.; Pakhlova, G.; Palka, H.; Park, C. W.; Park, H.; Park, H. K.; Peak, L. S.; Pestotnik, R.; Piilonen, L. E.; Poluektov, A.; Sahoo, H.; Sakai, Y.; Schneider, O.; Schwartz, A. J.; Seidl, R.; Sekiya, A.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shebalin, V.; Shen, C. P.; Shiu, J. G.; Shwartz, B.; Singh, J. B.; Sokolov, A.; Stanič, S.; Starič, M.; Sumiyoshi, T.; Takasaki, F.; Tamura, N.; Tanaka, M.; Taylor, G. N.; Teramoto, Y.; Trabelsi, K.; Tsuboyama, T.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Varner, G.; Vervink, K.; Vinokurova, A.; Wang, C. H.; Wang, P.; Wang, X. L.; Watanabe, Y.; Won, Eunil; Yamashita, Y.; Yamauchi, M.; Yuan, C. Z.; Zhang, C. C.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zivko, T.; Zupanc, A.; Zyukova, O.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 78, No. 7, 072006, 28.10.2008.

Research output: Contribution to journalArticle

Fujikawa, M, Hayashii, H, Eidelman, S, Adachi, I, Aihara, H, Arinstein, K, Aulchenko, V, Aushev, T, Bakich, AM, Balagura, V, Barberio, E, Bay, A, Bedny, I, Belous, K, Bhardwaj, V, Bitenc, U, Bondar, A, Bračko, M, Brodzicka, J, Browder, TE, Chang, P, Chao, Y, Chen, A, Cheon, BG, Chistov, R, Cho, IS, Choi, Y, Dalseno, J, Dash, M, Epifanov, D, Gabyshev, N, Golob, B, Ha, H, Haba, J, Hara, K, Hasegawa, Y, Hayasaka, K, Hazumi, M, Heffernan, D, Hoshi, Y, Hou, WS, Hyun, HJ, Iijima, T, Inami, K, Ishikawa, A, Ishino, H, Itoh, R, Iwabuchi, M, Iwasaki, M, Kah, DH, Kaji, H, Kataoka, SU, Kawasaki, T, Kichimi, H, Kim, HO, Kim, SK, Kim, YI, Kim, YJ, Korpar, S, Križan, P, Krokovny, P, Kumar, R, Kuzmin, A, Kwon, YJ, Kyeong, SH, Lange, JS, Lee, MJ, Lee, SE, Limosani, A, Liu, C, Liu, Y, Liventsev, D, MacNaughton, J, Mandl, F, Matyja, A, McOnie, S, Miyabayashi, K, Miyata, H, Miyazaki, Y, Mizuk, R, Moloney, GR, Mori, T, Nagasaka, Y, Nakano, E, Nakao, M, Nakazawa, H, Natkaniec, Z, Nishida, S, Nitoh, O, Noguchi, S, Nozaki, T, Ohshima, T, Okuno, S, Olsen, SL, Ozaki, H, Pakhlov, P, Pakhlova, G, Palka, H, Park, CW, Park, H, Park, HK, Peak, LS, Pestotnik, R, Piilonen, LE, Poluektov, A, Sahoo, H, Sakai, Y, Schneider, O, Schwartz, AJ, Seidl, R, Sekiya, A, Senyo, K, Sevior, ME, Shapkin, M, Shebalin, V, Shen, CP, Shiu, JG, Shwartz, B, Singh, JB, Sokolov, A, Stanič, S, Starič, M, Sumiyoshi, T, Takasaki, F, Tamura, N, Tanaka, M, Taylor, GN, Teramoto, Y, Trabelsi, K, Tsuboyama, T, Uehara, S, Uglov, T, Unno, Y, Uno, S, Urquijo, P, Usov, Y, Varner, G, Vervink, K, Vinokurova, A, Wang, CH, Wang, P, Wang, XL, Watanabe, Y, Won, E, Yamashita, Y, Yamauchi, M, Yuan, CZ, Zhang, CC, Zhang, ZP, Zhilich, V, Zhulanov, V, Zivko, T, Zupanc, A & Zyukova, O 2008, 'High-statistics study of the τ-→π-π0ντ decay', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 78, no. 7, 072006. https://doi.org/10.1103/PhysRevD.78.072006
Fujikawa M, Hayashii H, Eidelman S, Adachi I, Aihara H, Arinstein K et al. High-statistics study of the τ-→π-π0ντ decay. Physical Review D - Particles, Fields, Gravitation and Cosmology. 2008 Oct 28;78(7). 072006. https://doi.org/10.1103/PhysRevD.78.072006
Fujikawa, M. ; Hayashii, H. ; Eidelman, S. ; Adachi, I. ; Aihara, H. ; Arinstein, K. ; Aulchenko, V. ; Aushev, T. ; Bakich, A. M. ; Balagura, V. ; Barberio, E. ; Bay, A. ; Bedny, I. ; Belous, K. ; Bhardwaj, V. ; Bitenc, U. ; Bondar, A. ; Bračko, M. ; Brodzicka, J. ; Browder, T. E. ; Chang, P. ; Chao, Y. ; Chen, A. ; Cheon, B. G. ; Chistov, R. ; Cho, I. S. ; Choi, Y. ; Dalseno, J. ; Dash, M. ; Epifanov, D. ; Gabyshev, N. ; Golob, B. ; Ha, H. ; Haba, J. ; Hara, K. ; Hasegawa, Y. ; Hayasaka, K. ; Hazumi, M. ; Heffernan, D. ; Hoshi, Y. ; Hou, W. S. ; Hyun, H. J. ; Iijima, T. ; Inami, K. ; Ishikawa, A. ; Ishino, H. ; Itoh, R. ; Iwabuchi, M. ; Iwasaki, M. ; Kah, D. H. ; Kaji, H. ; Kataoka, S. U. ; Kawasaki, T. ; Kichimi, H. ; Kim, H. O. ; Kim, S. K. ; Kim, Y. I. ; Kim, Y. J. ; Korpar, S. ; Križan, P. ; Krokovny, P. ; Kumar, R. ; Kuzmin, A. ; Kwon, Y. J. ; Kyeong, S. H. ; Lange, J. S. ; Lee, M. J. ; Lee, S. E. ; Limosani, A. ; Liu, C. ; Liu, Y. ; Liventsev, D. ; MacNaughton, J. ; Mandl, F. ; Matyja, A. ; McOnie, S. ; Miyabayashi, K. ; Miyata, H. ; Miyazaki, Y. ; Mizuk, R. ; Moloney, G. R. ; Mori, T. ; Nagasaka, Y. ; Nakano, E. ; Nakao, M. ; Nakazawa, H. ; Natkaniec, Z. ; Nishida, S. ; Nitoh, O. ; Noguchi, S. ; Nozaki, T. ; Ohshima, T. ; Okuno, S. ; Olsen, S. L. ; Ozaki, H. ; Pakhlov, P. ; Pakhlova, G. ; Palka, H. ; Park, C. W. ; Park, H. ; Park, H. K. ; Peak, L. S. ; Pestotnik, R. ; Piilonen, L. E. ; Poluektov, A. ; Sahoo, H. ; Sakai, Y. ; Schneider, O. ; Schwartz, A. J. ; Seidl, R. ; Sekiya, A. ; Senyo, K. ; Sevior, M. E. ; Shapkin, M. ; Shebalin, V. ; Shen, C. P. ; Shiu, J. G. ; Shwartz, B. ; Singh, J. B. ; Sokolov, A. ; Stanič, S. ; Starič, M. ; Sumiyoshi, T. ; Takasaki, F. ; Tamura, N. ; Tanaka, M. ; Taylor, G. N. ; Teramoto, Y. ; Trabelsi, K. ; Tsuboyama, T. ; Uehara, S. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Usov, Y. ; Varner, G. ; Vervink, K. ; Vinokurova, A. ; Wang, C. H. ; Wang, P. ; Wang, X. L. ; Watanabe, Y. ; Won, Eunil ; Yamashita, Y. ; Yamauchi, M. ; Yuan, C. Z. ; Zhang, C. C. ; Zhang, Z. P. ; Zhilich, V. ; Zhulanov, V. ; Zivko, T. ; Zupanc, A. ; Zyukova, O. / High-statistics study of the τ-→π-π0ντ decay. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2008 ; Vol. 78, No. 7.
@article{0eff69c164b54eb399dab6cd2e23def0,
title = "High-statistics study of the τ-→π-π0ντ decay",
abstract = "We report a high-statistics measurement of the branching fraction for τ-→π-π0ντ and the invariant mass spectrum of the produced π-π0 system using 72.2fb-1 of data recorded with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fraction obtained is (25.24±0.01±0.39){\%}, where the first error is statistical and the second is systematic. The unfolded π-π0 mass spectrum is used to determine resonance parameters for the ρ(770), ρ′(1450), and ρ′′(1700) mesons. We also use this spectrum to estimate the hadronic (2π) contribution to the anomalous magnetic moment of the muon (aμππ). Our result for aμππ integrated over the mass range s=2mπ-1.8GeV/c2 is aμππ=(523.5±1.5(exp)±2.6(Br) ±2.5(isospin))×10-10, where the first error is due to the experimental uncertainties, the second is due to the uncertainties in the branching fractions, and the third is due to the uncertainties in the isospin-violating corrections.",
author = "M. Fujikawa and H. Hayashii and S. Eidelman and I. Adachi and H. Aihara and K. Arinstein and V. Aulchenko and T. Aushev and Bakich, {A. M.} and V. Balagura and E. Barberio and A. Bay and I. Bedny and K. Belous and V. Bhardwaj and U. Bitenc and A. Bondar and M. Bračko and J. Brodzicka and Browder, {T. E.} and P. Chang and Y. Chao and A. Chen and Cheon, {B. G.} and R. Chistov and Cho, {I. S.} and Y. Choi and J. Dalseno and M. Dash and D. Epifanov and N. Gabyshev and B. Golob and H. Ha and J. Haba and K. Hara and Y. Hasegawa and K. Hayasaka and M. Hazumi and D. Heffernan and Y. Hoshi and Hou, {W. S.} and Hyun, {H. J.} and T. Iijima and K. Inami and A. Ishikawa and H. Ishino and R. Itoh and M. Iwabuchi and M. Iwasaki and Kah, {D. H.} and H. Kaji and Kataoka, {S. U.} and T. Kawasaki and H. Kichimi and Kim, {H. O.} and Kim, {S. K.} and Kim, {Y. I.} and Kim, {Y. J.} and S. Korpar and P. Križan and P. Krokovny and R. Kumar and A. Kuzmin and Kwon, {Y. J.} and Kyeong, {S. H.} and Lange, {J. S.} and Lee, {M. J.} and Lee, {S. E.} and A. Limosani and C. Liu and Y. Liu and D. Liventsev and J. MacNaughton and F. Mandl and A. Matyja and S. McOnie and K. Miyabayashi and H. Miyata and Y. Miyazaki and R. Mizuk and Moloney, {G. R.} and T. Mori and Y. Nagasaka and E. Nakano and M. Nakao and H. Nakazawa and Z. Natkaniec and S. Nishida and O. Nitoh and S. Noguchi and T. Nozaki and T. Ohshima and S. Okuno and Olsen, {S. L.} and H. Ozaki and P. Pakhlov and G. Pakhlova and H. Palka and Park, {C. W.} and H. Park and Park, {H. K.} and Peak, {L. S.} and R. Pestotnik and Piilonen, {L. E.} and A. Poluektov and H. Sahoo and Y. Sakai and O. Schneider and Schwartz, {A. J.} and R. Seidl and A. Sekiya and K. Senyo and Sevior, {M. E.} and M. Shapkin and V. Shebalin and Shen, {C. P.} and Shiu, {J. G.} and B. Shwartz and Singh, {J. B.} and A. Sokolov and S. Stanič and M. Starič and T. Sumiyoshi and F. Takasaki and N. Tamura and M. Tanaka and Taylor, {G. N.} and Y. Teramoto and K. Trabelsi and T. Tsuboyama and S. Uehara and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Usov and G. Varner and K. Vervink and A. Vinokurova and Wang, {C. H.} and P. Wang and Wang, {X. L.} and Y. Watanabe and Eunil Won and Y. Yamashita and M. Yamauchi and Yuan, {C. Z.} and Zhang, {C. C.} and Zhang, {Z. P.} and V. Zhilich and V. Zhulanov and T. Zivko and A. Zupanc and O. Zyukova",
year = "2008",
month = "10",
day = "28",
doi = "10.1103/PhysRevD.78.072006",
language = "English",
volume = "78",
journal = "Physical review D: Particles and fields",
issn = "0556-2821",
publisher = "American Institute of Physics Publising LLC",
number = "7",

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TY - JOUR

T1 - High-statistics study of the τ-→π-π0ντ decay

AU - Fujikawa, M.

AU - Hayashii, H.

AU - Eidelman, S.

AU - Adachi, I.

AU - Aihara, H.

AU - Arinstein, K.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Balagura, V.

AU - Barberio, E.

AU - Bay, A.

AU - Bedny, I.

AU - Belous, K.

AU - Bhardwaj, V.

AU - Bitenc, U.

AU - Bondar, A.

AU - Bračko, M.

AU - Brodzicka, J.

AU - Browder, T. E.

AU - Chang, P.

AU - Chao, Y.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chistov, R.

AU - Cho, I. S.

AU - Choi, Y.

AU - Dalseno, J.

AU - Dash, M.

AU - Epifanov, D.

AU - Gabyshev, N.

AU - Golob, B.

AU - Ha, H.

AU - Haba, J.

AU - Hara, K.

AU - Hasegawa, Y.

AU - Hayasaka, K.

AU - Hazumi, M.

AU - Heffernan, D.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hyun, H. J.

AU - Iijima, T.

AU - Inami, K.

AU - Ishikawa, A.

AU - Ishino, H.

AU - Itoh, R.

AU - Iwabuchi, M.

AU - Iwasaki, M.

AU - Kah, D. H.

AU - Kaji, H.

AU - Kataoka, S. U.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kim, H. O.

AU - Kim, S. K.

AU - Kim, Y. I.

AU - Kim, Y. J.

AU - Korpar, S.

AU - Križan, P.

AU - Krokovny, P.

AU - Kumar, R.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Kyeong, S. H.

AU - Lange, J. S.

AU - Lee, M. J.

AU - Lee, S. E.

AU - Limosani, A.

AU - Liu, C.

AU - Liu, Y.

AU - Liventsev, D.

AU - MacNaughton, J.

AU - Mandl, F.

AU - Matyja, A.

AU - McOnie, S.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Moloney, G. R.

AU - Mori, T.

AU - Nagasaka, Y.

AU - Nakano, E.

AU - Nakao, M.

AU - Nakazawa, H.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nitoh, O.

AU - Noguchi, S.

AU - Nozaki, T.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Ozaki, H.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Palka, H.

AU - Park, C. W.

AU - Park, H.

AU - Park, H. K.

AU - Peak, L. S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Poluektov, A.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Schneider, O.

AU - Schwartz, A. J.

AU - Seidl, R.

AU - Sekiya, A.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shebalin, V.

AU - Shen, C. P.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Singh, J. B.

AU - Sokolov, A.

AU - Stanič, S.

AU - Starič, M.

AU - Sumiyoshi, T.

AU - Takasaki, F.

AU - Tamura, N.

AU - Tanaka, M.

AU - Taylor, G. N.

AU - Teramoto, Y.

AU - Trabelsi, K.

AU - Tsuboyama, T.

AU - Uehara, S.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Usov, Y.

AU - Varner, G.

AU - Vervink, K.

AU - Vinokurova, A.

AU - Wang, C. H.

AU - Wang, P.

AU - Wang, X. L.

AU - Watanabe, Y.

AU - Won, Eunil

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Yuan, C. Z.

AU - Zhang, C. C.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhulanov, V.

AU - Zivko, T.

AU - Zupanc, A.

AU - Zyukova, O.

PY - 2008/10/28

Y1 - 2008/10/28

N2 - We report a high-statistics measurement of the branching fraction for τ-→π-π0ντ and the invariant mass spectrum of the produced π-π0 system using 72.2fb-1 of data recorded with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fraction obtained is (25.24±0.01±0.39)%, where the first error is statistical and the second is systematic. The unfolded π-π0 mass spectrum is used to determine resonance parameters for the ρ(770), ρ′(1450), and ρ′′(1700) mesons. We also use this spectrum to estimate the hadronic (2π) contribution to the anomalous magnetic moment of the muon (aμππ). Our result for aμππ integrated over the mass range s=2mπ-1.8GeV/c2 is aμππ=(523.5±1.5(exp)±2.6(Br) ±2.5(isospin))×10-10, where the first error is due to the experimental uncertainties, the second is due to the uncertainties in the branching fractions, and the third is due to the uncertainties in the isospin-violating corrections.

AB - We report a high-statistics measurement of the branching fraction for τ-→π-π0ντ and the invariant mass spectrum of the produced π-π0 system using 72.2fb-1 of data recorded with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fraction obtained is (25.24±0.01±0.39)%, where the first error is statistical and the second is systematic. The unfolded π-π0 mass spectrum is used to determine resonance parameters for the ρ(770), ρ′(1450), and ρ′′(1700) mesons. We also use this spectrum to estimate the hadronic (2π) contribution to the anomalous magnetic moment of the muon (aμππ). Our result for aμππ integrated over the mass range s=2mπ-1.8GeV/c2 is aμππ=(523.5±1.5(exp)±2.6(Br) ±2.5(isospin))×10-10, where the first error is due to the experimental uncertainties, the second is due to the uncertainties in the branching fractions, and the third is due to the uncertainties in the isospin-violating corrections.

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UR - http://www.scopus.com/inward/citedby.url?scp=55649120237&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.78.072006

DO - 10.1103/PhysRevD.78.072006

M3 - Article

VL - 78

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 7

M1 - 072006

ER -