Measurement of gamma gamma* --> pi0 transition form factor at Belle

The Belle Collaboration: S. Uehara , Y. Watanabe , H. Nakazawa , I. Adachi , H. Aihara , D. M. Asner , T. Aushev , A. M. Bakich

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K. Belous V. Bhardwaj B. Bhuyan M. Bischofberger A. Bondar G. Bonvicini A. Bozek M. Bracko T. E. Browder M.-C. Chang A. Chen P. Chen B. G. Cheon K. Chilikin I.-S. Cho K. Cho Y. Choi J. Dalseno Z. Dolezal Z. Drasal 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. Kodys S. Korpar R. T. Kouzes P. Krizan 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. Petric L. E. Piilonen K. Prothmann M. Rohrken 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. Staric 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 E. Won Y. Yamashita C. Z. Yuan C. C. Zhang Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc

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keywords gammameasurementbellefactorformmeasuredregiontransition

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We report a measurement of the process gamma gamma* --> pi0 with a 759 fb^{-1} data sample recorded with the Belle detector at the KEKB asymmetric-energy e+e- collider. The pion transition form factor, F(Q^2), is measured for the kinematical region 4 GeV^2 <~ Q^2 <~ 40 GeV^2, where -Q^2 is the invariant mass squared of a virtual photon. The measured values of Q^2|F(Q^2)| agree well with the previous measurements below Q^2 ~= 9 GeV^2 but do not exhibit the rapid growth in the higher Q^2 region seen in another recent measurement, which exceeds the asymptotic QCD expectation by as much as 50%.

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Neutral and charged pion Form Factors in the intermediate-energy region from double-dilaton HQCD model
hep-ph 2025-12 unverdicted novelty 5.0

Pion form factors in the intermediate-energy regime are computed via double-dilaton HQCD, indicating non-perturbative strong-interaction effects remain relevant at scales traditionally viewed as perturbative.