Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>pair production in single-tag two-photon collisions

Masuda, M.; Uehara, S.; Watanabe, Y.; Nakazawa, H.; Abdesselam, A.; Adachi, I.; Aihara, H.; Said, S. Al; Asner, D. M.; Atmacan, H.; Aulchenko, V.; Aushev, T.; Babu, V.; Badhrees, I.; Bakich, A. M.; Barberio, E.; Behera, P. K.; Bhuyan, B.; Biswal, Jyoti Prakash; Bobrov, A.; Bonvicini, G.; Bożek, A.; Bračko, M.; Browder, T. E.; Červenkov, D.; Chekelian, V.; Chen, A.; Cheon, B. G.; Chilikin, K.; Chistov, R.; Cho, K.; Chobanova, V.; Choi, S. K.; Choi, Y.; Cinabro, D.; Dalseno, J.; Danilov, M.; Dash, N.; Dingfelder, J.; Doležal, Z.; Drásal, Z.; Dutta, D.; Eidelman, S.; Epifanov, D.; Farhat, H.; Fast, J. E.; Ferber, T.; Fulsom, B. G.; Gaur, V.; Gabyshev, N.; Garmash, A.; Gillard, R.; Giordano, F.; Glattauer, R.; Goh, Y. M.; Goldenzweig, P.; Golob, B.; Haba, J.; Hayasaka, K.; Hayashii, H.; He, X.; Hou, W.-S.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, Y.; Jaeglé, I.; Joffe, D.; Joo, K. K.; Julius, T.; Kang, K. H.; Kato, E.; Kawasaki, T.; Kim, D.Y.; Kim, J.B.; Kim, J.H.; Kim, K.T.; Kim, M.J.; Kim, S.H.; Kim, Y.J.; Ko, B. R.; Korpar, S.; Križan, P.; Krokovny, P.; Kumita, T.; Kuzmin, A.; Kwon, Y.; Lange, J. S.; Lee, D.H.; Lee, I.S.; Li, C.; Li, L.; Li, Y.; Libby, J.; Liventsev, D.; Lukin, P.; Matvienko, D.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. B.; Mohanty, S.; Moll, A.; Moon, H. K.; Mori, Takashi; Mussa, R.; Nakano, E.; Nakao, M.; Nanut, T.; Natkaniec, Z.; Nayak, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Pakhlov, P.; Pakhlova, G.; Pal, B.; Park, C.W.; Park, H.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Rauch, J.; Ribežl, E.; Ritter, M.; Rostomyan, A.; Sandilya, S.; Šantelj, L.; Sanuki, T.; Sato, Y.; Savinov, V.; Schneider, O.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Seon, O.; Sevior, M. E.; Shebalin, V.; Shen, C. P.; Shibata, T. A.; Shiu, J. G.; Shwartz, B.; Simon, F.; Sohn, Y. S.; Sokolov, A.; Solovieva, E.; Starič, M.; Sumihama, M.; Sumiyoshi, T.; Tamponi, U.; Tanida, K.; Teramoto, Y.; Uglov, T.; Unno, Y.; Uno, S.; Hulse, C. Van; Vanhoefer, P.; Varner, G.; Vinokurova, A.; Vorobyev, V.; Vossen, A.; Wagner, M. N.; Wang, C.H.; Wang, M.-Z.; Wang, P.; Williams, K. M.; Won, E.; Yamaoka, J.; Yamashita, Y.; Yashchenko, S.; Ye, H.; Yusa, Y.; Zhang, C.C.; Zhang, Z.P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

doi:10.1103/physrevd.93.032003

Cited by 59 publications

(60 citation statements)

References 57 publications

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“…However, it appears in the total cross section [7] and the γ → f 0 ð980Þ transition form factor is investigated by using the Belle data [66]. Such studies indicate that f 0 ð980Þ is consistent with the qq configuration, which is different from our finding in Fig.…”

Section: Resultscontrasting

confidence: 57%

“…[24] seem to work below W ¼ 1 GeV. The region of the center-of-mass energy is 0.525 GeV ≤ ffiffi ffi s p ¼ W ≤ 2.05 GeV in the Belle data [7]. In order to analyze the Belle data, we use the S-wave and D-wave ππ phase shifts obtained by Bydzovsky, Kaminski, Nazari, and Surovtsev (BKNS) [55].…”

Section: Resultsmentioning

confidence: 99%

“…Here, the Belle data for γ Ã γ → π 0 π 0 [7] are used for our study. The invariantmass dependent functions are parametrized with the resonance contributions from f 0 ð500Þ, f 0 ð980Þ and f 2 ð1270Þ, and it is summarized as…”

Section: Resultsmentioning

confidence: 99%

“…(101) and (102) [59], although the resonance properties are also obtained by the Belle collaboration for the resonances f 0 ð980Þ and f 2 ð1270Þ [7]. In Refs.…”

Section: F Resonance Terms and Their Coupling Constantsmentioning

confidence: 99%

“…Fortunately, the Belle collaboration recently reported the cross sections for the pion-pair production in two-photon process γ Ã γ → π 0 π 0 at KEKB with various kinematical conditions [6,7]. It is our research purpose of this paper to extract the pion GDAs from the Belle measurements.…”

Section: Introductionmentioning

confidence: 99%

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Hadron tomography by generalized distribution amplitudes in the pion-pair production process γγ→π0π0
Kumano¹,
Song²,
Teryaev³
2018
Phys. Rev. D*
121
8
116
0
1
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Hadron tomography can be investigated by three-dimensional structure functions such as generalized parton distributions (GPDs), transverse-momentum-dependent parton distributions, and generalized distribution amplitudes (GDAs). Here, we extract the GDAs, which are s-t crossed quantities of the GPDs, from cross-section measurements of hadron-pair production process γ Ã γ → π 0 π 0 at KEKB. This work is the first attempt to obtain the GDAs from the actual experimental data. The GDAs are expressed by a number of parameters and they are determined from the data of γ Ã γ → π 0 π 0 by including intermediate scalar-and tensor-meson contributions to the cross section. Our results indicate that the dependence of parton-momentum fraction z in the GDAs is close to the asymptotic one. The timelike gravitational form factors Θ 1 and Θ 2 are obtained from our GDAs, and they are converted to the spacelike ones by the dispersion relation. From the spacelike Θ 1 and Θ 2 , gravitational densities of the pion are calculated. Then, we obtained the mass (energy) radius and the mechanical (pressure and shear force) radius from Θ 2 and Θ 1 , respectively. They are calculated as ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi hr 2 i mass p ¼ 0.32-0.39 fm, whereas the mechanical radius is larger ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi hr 2 i mech p ¼ 0.82-0.88 fm. This is the first report on the gravitational radius of a hadron from actual experimental measurements. It is interesting to find the possibility that the gravitational mass and mechanical radii could be different from the experimental charge radius ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi hr 2 i charge q ¼ 0.672 AE 0.008 fm for the charged pion. For drawing a clear conclusion on the GDAs of hadrons, accurate experimental data are needed, and it should be possible, for example, by future measurements of super-KEKB and international linear collider. Accurate measurements will not only provide important information on hadron tomography but also possibly shed light on gravitational physics in the quark and gluon level.

show abstract

Section: Resultscontrasting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…(101) and (102) [59], although the resonance properties are also obtained by the Belle collaboration for the resonances f 0 ð980Þ and f 2 ð1270Þ [7]. In Refs.…”

Section: F Resonance Terms and Their Coupling Constantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hadron tomography by generalized distribution amplitudes in the pion-pair production process γγ→π0π0
Kumano¹,
Song²,
Teryaev³
2018
Phys. Rev. D*
121
8
116
0
1
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Hadronic Effects

Jegerlehner¹

2017

Springer Tracts in Modern Physics

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Asymptotic behavior of meson transition form factors

Hoferichter

Stoffer

2020

J. High Energ. Phys.

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One of the open issues in evaluations of the contribution from hadronic lightby-light scattering to the anomalous magnetic moment of the muon (g − 2) µ concerns the role of heavier scalar, axial-vector, and tensor-meson intermediate states. The coupling of axial vectors to virtual photons is suppressed for small virtualities by the Landau-Yang theorem, but otherwise there are few rigorous constraints on the corresponding form factors. In this paper, we first derive the Lorentz decomposition of the two-photon matrix elements into scalar functions following the general recipe by Bardeen, Tung, and Tarrach. Based on this decomposition, we then calculate the asymptotic behavior of the meson transition form factors from a light-cone expansion in analogy to the asymptotic limits for the pseudoscalar transition form factor derived by Brodsky and Lepage. Finally, we compare our results to existing data as well as previous models employed in the literature.

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Study ofπ0pair production in single-tag two-photon collisions

Cited by 59 publications

References 57 publications

Hadron tomography by generalized distribution amplitudes in the pion-pair production process γγ→π0π0
Kumano¹,
Song²,
Teryaev³
2018
Phys. Rev. D*
121
8
116
0
1
View full text Add to dashboard Cite

Hadron tomography by generalized distribution amplitudes in the pion-pair production process γγ→π0π0
Kumano¹,
Song²,
Teryaev³
2018
Phys. Rev. D*
121
8
116
0
1
View full text Add to dashboard Cite

Hadronic Effects

Asymptotic behavior of meson transition form factors

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Study ofπ0pair production in single-tag two-photon collisions

Cited by 59 publications

References 57 publications

Hadron tomography by generalized distribution amplitudes in the pion-pair production process γ*γ→π0π0Kumano1, Song2, Teryaev3 2018Phys. Rev. D121811601View full textAdd to dashboardCite

Hadron tomography by generalized distribution amplitudes in the pion-pair production process γ*γ→π0π0Kumano1, Song2, Teryaev3 2018Phys. Rev. D121811601View full textAdd to dashboardCite

Hadronic Effects

Asymptotic behavior of meson transition form factors

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Product

Resources

About

Hadron tomography by generalized distribution amplitudes in the pion-pair production process γγ→π0π0
Kumano¹,
Song²,
Teryaev³
2018
Phys. Rev. D*
121
8
116
0
1
View full text Add to dashboard Cite

Hadron tomography by generalized distribution amplitudes in the pion-pair production process γγ→π0π0
Kumano¹,
Song²,
Teryaev³
2018
Phys. Rev. D*
121
8
116
0
1
View full text Add to dashboard Cite