Measurement of γγ *→π0 transition form factor at Belle

S. Uehara, Y. Watanabe, H. Nakazawa, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, A. M. Bakich, K. Belous, V. Bhardwaj, B. Bhuyan, M. Bischofberger, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, A. Chen, P. Chen & 140 others B. G. Cheon, K. Chilikin, I. S. Cho, K. Cho, Y. Choi, J. Dalseno, Z. Doleal, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, M. Feindt, V. Gaur, N. Gabyshev, Y. M. Goh, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Iwashita, T. Julius, J. H. Kang, T. Kawasaki, C. Kiesling, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, B. R. Ko, S. Koblitz, P. Kody, S. Korpar, R. T. Kouzes, P. Krian, P. Krokovny, A. Kuzmin, Y. J. Kwon, J. S. Lange, S. H. Lee, J. Li, Y. Li, J. Libby, C. L. Lim, C. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, R. Louvot, D. Matvienko, K. Miyabayashi, H. Miyata, Y. Miyazaki, G. B. Mohanty, A. Moll, T. Mori, N. Muramatsu, Y. Nagasaka, E. Nakano, M. Nakao, Z. Natkaniec, S. Nishida, K. Nishimura, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, G. Pakhlova, H. K. Park, K. S. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, K. Prothmann, M. Röhrken, S. Ryu, H. Sahoo, K. Sakai, Y. Sakai, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, C. Schwanda, R. Seidl, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, C. P. Shen, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, M. Starič, T. Sumiyoshi, Y. Teramoto, K. Trabelsi, T. Tsuboyama, M. Uchida, Y. Unno, S. Uno, Y. Usov, P. Vanhoefer, G. Varner, A. Vinokurova, V. Vorobyev, C. H. Wang, P. Wang, M. Watanabe, K. M. Williams, Eunil Won, Y. Yamashita, C. Z. Yuan, C. C. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

Research output: Contribution to journalArticle

146 Citations (Scopus)

Abstract

We report a measurement of the process γγ *→π0 with a 759fb -1 data sample recorded with the Belle detector at the KEKB asymmetric-energy e +e - collider. The pion transition form factor, F(Q2), is measured for the kinematical region 4GeV2Q240GeV2, where -Q2 is the invariant-mass squared of a virtual photon. The measured values of Q2|F(Q2)| agree well with the previous measurements below Q29GeV2 but do not exhibit the rapid growth in the higher Q2 region seen in another recent measurement, which exceeds the asymptotic QCD expectation by as much as 50%.

Original languageEnglish
Article number092007
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number9
DOIs
Publication statusPublished - 2012 Nov 9

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form factors
pions
quantum chromodynamics
detectors
photons
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Uehara, S., Watanabe, Y., Nakazawa, H., Adachi, I., Aihara, H., Asner, D. M., ... Zupanc, A. (2012). Measurement of γγ *→π0 transition form factor at Belle. Physical Review D - Particles, Fields, Gravitation and Cosmology, 86(9), [092007]. https://doi.org/10.1103/PhysRevD.86.092007

Measurement of γγ *→π0 transition form factor at Belle. / Uehara, S.; Watanabe, Y.; Nakazawa, H.; Adachi, I.; Aihara, H.; Asner, D. M.; Aushev, T.; Bakich, A. M.; Belous, K.; Bhardwaj, V.; Bhuyan, B.; Bischofberger, M.; Bondar, A.; Bonvicini, G.; Bozek, A.; Bračko, M.; Browder, T. E.; Chang, M. C.; Chen, A.; Chen, P.; Cheon, B. G.; Chilikin, K.; Cho, I. S.; Cho, K.; Choi, Y.; Dalseno, J.; Doleal, Z.; Drásal, Z.; Eidelman, S.; Epifanov, D.; Fast, J. E.; Feindt, M.; Gaur, V.; Gabyshev, N.; Goh, Y. M.; Golob, B.; Haba, J.; Hayasaka, K.; Hayashii, H.; Horii, Y.; Hoshi, Y.; Hou, W. S.; Hyun, H. J.; Iijima, T.; Ishikawa, A.; Itoh, R.; Iwabuchi, M.; Iwasaki, Y.; Iwashita, T.; Julius, T.; Kang, J. H.; Kawasaki, T.; Kiesling, C.; Kim, H. J.; Kim, H. O.; Kim, J. B.; Kim, J. H.; Kim, K. T.; Kim, M. J.; Kim, Y. J.; Ko, B. R.; Koblitz, S.; Kody, P.; Korpar, S.; Kouzes, R. T.; Krian, P.; Krokovny, P.; Kuzmin, A.; Kwon, Y. J.; Lange, J. S.; Lee, S. H.; Li, J.; Li, Y.; Libby, J.; Lim, C. L.; Liu, C.; Liu, Y.; Liu, Z. Q.; Liventsev, D.; Louvot, R.; Matvienko, D.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mohanty, G. B.; Moll, A.; Mori, T.; Muramatsu, N.; Nagasaka, Y.; Nakano, E.; Nakao, M.; Natkaniec, Z.; Nishida, S.; Nishimura, K.; Nitoh, O.; Ogawa, S.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Onuki, Y.; Pakhlov, P.; Pakhlova, G.; Park, H. K.; Park, K. S.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Prothmann, K.; Röhrken, M.; Ryu, S.; Sahoo, H.; Sakai, K.; Sakai, Y.; Sanuki, T.; Sato, Y.; Savinov, V.; Schneider, O.; Schwanda, C.; Seidl, R.; Senyo, K.; Seon, O.; Sevior, M. E.; Shapkin, M.; Shen, C. P.; Shibata, T. A.; Shiu, J. G.; Shwartz, B.; Sibidanov, A.; Simon, F.; Singh, J. B.; Smerkol, P.; Sohn, Y. S.; Sokolov, A.; Solovieva, E.; Starič, M.; Sumiyoshi, T.; Teramoto, Y.; Trabelsi, K.; Tsuboyama, T.; Uchida, M.; Unno, Y.; Uno, S.; Usov, Y.; Vanhoefer, P.; Varner, G.; Vinokurova, A.; Vorobyev, V.; Wang, C. H.; Wang, P.; Watanabe, M.; Williams, K. M.; Won, Eunil; Yamashita, Y.; Yuan, C. Z.; Zhang, C. C.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 86, No. 9, 092007, 09.11.2012.

Research output: Contribution to journalArticle

Uehara, S, Watanabe, Y, Nakazawa, H, Adachi, I, Aihara, H, Asner, DM, Aushev, T, Bakich, AM, Belous, K, Bhardwaj, V, Bhuyan, B, Bischofberger, M, Bondar, A, Bonvicini, G, Bozek, A, Bračko, M, Browder, TE, Chang, MC, Chen, A, Chen, P, Cheon, BG, Chilikin, K, Cho, IS, Cho, K, Choi, Y, Dalseno, J, Doleal, Z, Drásal, Z, Eidelman, S, Epifanov, D, Fast, JE, Feindt, M, Gaur, V, Gabyshev, N, Goh, YM, Golob, B, Haba, J, Hayasaka, K, Hayashii, H, Horii, Y, Hoshi, Y, Hou, WS, Hyun, HJ, Iijima, T, Ishikawa, A, Itoh, R, Iwabuchi, M, Iwasaki, Y, Iwashita, T, Julius, T, Kang, JH, Kawasaki, T, Kiesling, C, Kim, HJ, Kim, HO, Kim, JB, Kim, JH, Kim, KT, Kim, MJ, Kim, YJ, Ko, BR, Koblitz, S, Kody, P, Korpar, S, Kouzes, RT, Krian, P, Krokovny, P, Kuzmin, A, Kwon, YJ, Lange, JS, Lee, SH, Li, J, Li, Y, Libby, J, Lim, CL, Liu, C, Liu, Y, Liu, ZQ, Liventsev, D, Louvot, R, Matvienko, D, Miyabayashi, K, Miyata, H, Miyazaki, Y, Mohanty, GB, Moll, A, Mori, T, Muramatsu, N, Nagasaka, Y, Nakano, E, Nakao, M, Natkaniec, Z, Nishida, S, Nishimura, K, Nitoh, O, Ogawa, S, Ohshima, T, Okuno, S, Olsen, SL, Onuki, Y, Pakhlov, P, Pakhlova, G, Park, HK, Park, KS, Pedlar, TK, Pestotnik, R, Petrič, M, Piilonen, LE, Prothmann, K, Röhrken, M, Ryu, S, Sahoo, H, Sakai, K, Sakai, Y, Sanuki, T, Sato, Y, Savinov, V, Schneider, O, Schwanda, C, Seidl, R, Senyo, K, Seon, O, Sevior, ME, Shapkin, M, Shen, CP, Shibata, TA, Shiu, JG, Shwartz, B, Sibidanov, A, Simon, F, Singh, JB, Smerkol, P, Sohn, YS, Sokolov, A, Solovieva, E, Starič, M, Sumiyoshi, T, Teramoto, Y, Trabelsi, K, Tsuboyama, T, Uchida, M, Unno, Y, Uno, S, Usov, Y, Vanhoefer, P, Varner, G, Vinokurova, A, Vorobyev, V, Wang, CH, Wang, P, Watanabe, M, Williams, KM, Won, E, Yamashita, Y, Yuan, CZ, Zhang, CC, Zhang, ZP, Zhilich, V, Zhulanov, V & Zupanc, A 2012, 'Measurement of γγ *→π0 transition form factor at Belle', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 86, no. 9, 092007. https://doi.org/10.1103/PhysRevD.86.092007
Uehara, S. ; Watanabe, Y. ; Nakazawa, H. ; Adachi, I. ; Aihara, H. ; Asner, D. M. ; Aushev, T. ; Bakich, A. M. ; Belous, K. ; Bhardwaj, V. ; Bhuyan, B. ; Bischofberger, M. ; Bondar, A. ; Bonvicini, G. ; Bozek, A. ; Bračko, M. ; Browder, T. E. ; Chang, M. C. ; Chen, A. ; Chen, P. ; Cheon, B. G. ; Chilikin, K. ; Cho, I. S. ; Cho, K. ; Choi, Y. ; Dalseno, J. ; Doleal, Z. ; Drásal, Z. ; Eidelman, S. ; Epifanov, D. ; Fast, J. E. ; Feindt, M. ; Gaur, V. ; Gabyshev, N. ; Goh, Y. M. ; Golob, B. ; Haba, J. ; Hayasaka, K. ; Hayashii, H. ; Horii, Y. ; Hoshi, Y. ; Hou, W. S. ; Hyun, H. J. ; Iijima, T. ; Ishikawa, A. ; Itoh, R. ; Iwabuchi, M. ; Iwasaki, Y. ; Iwashita, T. ; Julius, T. ; Kang, J. H. ; Kawasaki, T. ; Kiesling, C. ; Kim, H. J. ; Kim, H. O. ; Kim, J. B. ; Kim, J. H. ; Kim, K. T. ; Kim, M. J. ; Kim, Y. J. ; Ko, B. R. ; Koblitz, S. ; Kody, P. ; Korpar, S. ; Kouzes, R. T. ; Krian, P. ; Krokovny, P. ; Kuzmin, A. ; Kwon, Y. J. ; Lange, J. S. ; Lee, S. H. ; Li, J. ; Li, Y. ; Libby, J. ; Lim, C. L. ; Liu, C. ; Liu, Y. ; Liu, Z. Q. ; Liventsev, D. ; Louvot, R. ; Matvienko, D. ; Miyabayashi, K. ; Miyata, H. ; Miyazaki, Y. ; Mohanty, G. B. ; Moll, A. ; Mori, T. ; Muramatsu, N. ; Nagasaka, Y. ; Nakano, E. ; Nakao, M. ; Natkaniec, Z. ; Nishida, S. ; Nishimura, K. ; Nitoh, O. ; Ogawa, S. ; Ohshima, T. ; Okuno, S. ; Olsen, S. L. ; Onuki, Y. ; Pakhlov, P. ; Pakhlova, G. ; Park, H. K. ; Park, K. S. ; Pedlar, T. K. ; Pestotnik, R. ; Petrič, M. ; Piilonen, L. E. ; Prothmann, K. ; Röhrken, M. ; Ryu, S. ; Sahoo, H. ; Sakai, K. ; Sakai, Y. ; Sanuki, T. ; Sato, Y. ; Savinov, V. ; Schneider, O. ; Schwanda, C. ; Seidl, R. ; Senyo, K. ; Seon, O. ; Sevior, M. E. ; Shapkin, M. ; Shen, C. P. ; Shibata, T. A. ; Shiu, J. G. ; Shwartz, B. ; Sibidanov, A. ; Simon, F. ; Singh, J. B. ; Smerkol, P. ; Sohn, Y. S. ; Sokolov, A. ; Solovieva, E. ; Starič, M. ; Sumiyoshi, T. ; Teramoto, Y. ; Trabelsi, K. ; Tsuboyama, T. ; Uchida, M. ; Unno, Y. ; Uno, S. ; Usov, Y. ; Vanhoefer, P. ; Varner, G. ; Vinokurova, A. ; Vorobyev, V. ; Wang, C. H. ; Wang, P. ; Watanabe, M. ; Williams, K. M. ; Won, Eunil ; Yamashita, Y. ; Yuan, C. Z. ; Zhang, C. C. ; Zhang, Z. P. ; Zhilich, V. ; Zhulanov, V. ; Zupanc, A. / Measurement of γγ *→π0 transition form factor at Belle. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2012 ; Vol. 86, No. 9.
@article{b800ad52028e4946af9b5fbee1c54c3d,
title = "Measurement of γγ *→π0 transition form factor at Belle",
abstract = "We report a measurement of the process γγ *→π0 with a 759fb -1 data sample recorded with the Belle detector at the KEKB asymmetric-energy e +e - collider. The pion transition form factor, F(Q2), is measured for the kinematical region 4GeV2Q240GeV2, where -Q2 is the invariant-mass squared of a virtual photon. The measured values of Q2|F(Q2)| agree well with the previous measurements below Q29GeV2 but do not exhibit the rapid growth in the higher Q2 region seen in another recent measurement, which exceeds the asymptotic QCD expectation by as much as 50{\%}.",
author = "S. Uehara and Y. Watanabe and H. Nakazawa and I. Adachi and H. Aihara and Asner, {D. M.} and T. Aushev and Bakich, {A. M.} and K. Belous and V. Bhardwaj and B. Bhuyan and M. Bischofberger and A. Bondar and G. Bonvicini and A. Bozek and M. Bračko and Browder, {T. E.} and Chang, {M. C.} and A. Chen and P. Chen and Cheon, {B. G.} and K. Chilikin and Cho, {I. S.} and K. Cho and Y. Choi and J. Dalseno and Z. Doleal and Z. Dr{\'a}sal and S. Eidelman and D. Epifanov and Fast, {J. E.} and M. Feindt and V. Gaur and N. Gabyshev and Goh, {Y. M.} and B. Golob and J. Haba and K. Hayasaka and H. Hayashii and Y. Horii and Y. Hoshi and Hou, {W. S.} and Hyun, {H. J.} and T. Iijima and A. Ishikawa and R. Itoh and M. Iwabuchi and Y. Iwasaki and T. Iwashita and T. Julius and Kang, {J. H.} and T. Kawasaki and C. Kiesling and Kim, {H. J.} and Kim, {H. O.} and Kim, {J. B.} and Kim, {J. H.} and Kim, {K. T.} and Kim, {M. J.} and Kim, {Y. J.} and Ko, {B. R.} and S. Koblitz and P. Kody and S. Korpar and Kouzes, {R. T.} and P. Krian and P. Krokovny and A. Kuzmin and Kwon, {Y. J.} and Lange, {J. S.} and Lee, {S. H.} and J. Li and Y. Li and J. Libby and Lim, {C. L.} and C. Liu and Y. Liu and Liu, {Z. Q.} and D. Liventsev and R. Louvot and D. Matvienko and K. Miyabayashi and H. Miyata and Y. Miyazaki and Mohanty, {G. B.} and A. Moll and T. Mori and N. Muramatsu and Y. Nagasaka and E. Nakano and M. Nakao and Z. Natkaniec and S. Nishida and K. Nishimura and O. Nitoh and S. Ogawa and T. Ohshima and S. Okuno and Olsen, {S. L.} and Y. Onuki and P. Pakhlov and G. Pakhlova and Park, {H. K.} and Park, {K. S.} and Pedlar, {T. K.} and R. Pestotnik and M. Petrič and Piilonen, {L. E.} and K. Prothmann and M. R{\"o}hrken and S. Ryu and H. Sahoo and K. Sakai and Y. Sakai and T. Sanuki and Y. Sato and V. Savinov and O. Schneider and C. Schwanda and R. Seidl and K. Senyo and O. Seon and Sevior, {M. E.} and M. Shapkin and Shen, {C. P.} and Shibata, {T. A.} and Shiu, {J. G.} and B. Shwartz and A. Sibidanov and F. Simon and Singh, {J. B.} and P. Smerkol and Sohn, {Y. S.} and A. Sokolov and E. Solovieva and M. Starič and T. Sumiyoshi and Y. Teramoto and K. Trabelsi and T. Tsuboyama and M. Uchida and Y. Unno and S. Uno and Y. Usov and P. Vanhoefer and G. Varner and A. Vinokurova and V. Vorobyev and Wang, {C. H.} and P. Wang and M. Watanabe and Williams, {K. M.} and Eunil Won and Y. Yamashita and Yuan, {C. Z.} and Zhang, {C. C.} and Zhang, {Z. P.} and V. Zhilich and V. Zhulanov and A. Zupanc",
year = "2012",
month = "11",
day = "9",
doi = "10.1103/PhysRevD.86.092007",
language = "English",
volume = "86",
journal = "Physical review D: Particles and fields",
issn = "0556-2821",
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TY - JOUR

T1 - Measurement of γγ *→π0 transition form factor at Belle

AU - Uehara, S.

AU - Watanabe, Y.

AU - Nakazawa, H.

AU - Adachi, I.

AU - Aihara, H.

AU - Asner, D. M.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Belous, K.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bischofberger, M.

AU - Bondar, A.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chang, M. C.

AU - Chen, A.

AU - Chen, P.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, I. S.

AU - Cho, K.

AU - Choi, Y.

AU - Dalseno, J.

AU - Doleal, Z.

AU - Drásal, Z.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Fast, J. E.

AU - Feindt, M.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Goh, Y. M.

AU - Golob, B.

AU - Haba, J.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Horii, Y.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hyun, H. J.

AU - Iijima, T.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwabuchi, M.

AU - Iwasaki, Y.

AU - Iwashita, T.

AU - Julius, T.

AU - Kang, J. H.

AU - Kawasaki, T.

AU - Kiesling, C.

AU - Kim, H. J.

AU - Kim, H. O.

AU - Kim, J. B.

AU - Kim, J. H.

AU - Kim, K. T.

AU - Kim, M. J.

AU - Kim, Y. J.

AU - Ko, B. R.

AU - Koblitz, S.

AU - Kody, P.

AU - Korpar, S.

AU - Kouzes, R. T.

AU - Krian, P.

AU - Krokovny, P.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lange, J. S.

AU - Lee, S. H.

AU - Li, J.

AU - Li, Y.

AU - Libby, J.

AU - Lim, C. L.

AU - Liu, C.

AU - Liu, Y.

AU - Liu, Z. Q.

AU - Liventsev, D.

AU - Louvot, R.

AU - Matvienko, D.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mohanty, G. B.

AU - Moll, A.

AU - Mori, T.

AU - Muramatsu, N.

AU - Nagasaka, Y.

AU - Nakano, E.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nishimura, K.

AU - Nitoh, O.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, H. K.

AU - Park, K. S.

AU - Pedlar, T. K.

AU - Pestotnik, R.

AU - Petrič, M.

AU - Piilonen, L. E.

AU - Prothmann, K.

AU - Röhrken, M.

AU - Ryu, S.

AU - Sahoo, H.

AU - Sakai, K.

AU - Sakai, Y.

AU - Sanuki, T.

AU - Sato, Y.

AU - Savinov, V.

AU - Schneider, O.

AU - Schwanda, C.

AU - Seidl, R.

AU - Senyo, K.

AU - Seon, O.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shen, C. P.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Sibidanov, A.

AU - Simon, F.

AU - Singh, J. B.

AU - Smerkol, P.

AU - Sohn, Y. S.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Starič, M.

AU - Sumiyoshi, T.

AU - Teramoto, Y.

AU - Trabelsi, K.

AU - Tsuboyama, T.

AU - Uchida, M.

AU - Unno, Y.

AU - Uno, S.

AU - Usov, Y.

AU - Vanhoefer, P.

AU - Varner, G.

AU - Vinokurova, A.

AU - Vorobyev, V.

AU - Wang, C. H.

AU - Wang, P.

AU - Watanabe, M.

AU - Williams, K. M.

AU - Won, Eunil

AU - Yamashita, Y.

AU - Yuan, C. Z.

AU - Zhang, C. C.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhulanov, V.

AU - Zupanc, A.

PY - 2012/11/9

Y1 - 2012/11/9

N2 - We report a measurement of the process γγ *→π0 with a 759fb -1 data sample recorded with the Belle detector at the KEKB asymmetric-energy e +e - collider. The pion transition form factor, F(Q2), is measured for the kinematical region 4GeV2Q240GeV2, where -Q2 is the invariant-mass squared of a virtual photon. The measured values of Q2|F(Q2)| agree well with the previous measurements below Q29GeV2 but do not exhibit the rapid growth in the higher Q2 region seen in another recent measurement, which exceeds the asymptotic QCD expectation by as much as 50%.

AB - We report a measurement of the process γγ *→π0 with a 759fb -1 data sample recorded with the Belle detector at the KEKB asymmetric-energy e +e - collider. The pion transition form factor, F(Q2), is measured for the kinematical region 4GeV2Q240GeV2, where -Q2 is the invariant-mass squared of a virtual photon. The measured values of Q2|F(Q2)| agree well with the previous measurements below Q29GeV2 but do not exhibit the rapid growth in the higher Q2 region seen in another recent measurement, which exceeds the asymptotic QCD expectation by as much as 50%.

UR - http://www.scopus.com/inward/record.url?scp=84869013210&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84869013210&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.86.092007

DO - 10.1103/PhysRevD.86.092007

M3 - Article

VL - 86

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 9

M1 - 092007

ER -