First measurement of the Q^2 distribution of X(3915) single-tag two-photon production

Collaboration, Belle; Teramoto, Y.; Uehara, S.; Adachi, I.; Aihara, H.; Said, S. Al; Asner, D. M.; Aushev, T.; Ayad, R.; Babu, V.; Banerjee, S.; Behera, P.; Belous, K.; Bennett, J.; Bessner, M.; Bhardwaj, V.; Bilka, T.; Biswas, D.; Bodrov, D.; Borah, J.; Bozek, A.; Bračko, M.; Branchini, P.; Browder, T. E.; Budano, A.; Campajola, M.; Červenkov, D.; Chang, M. -C.; Chekelian, V.; Cheon, B. G.; Chilikin, K.; Cho, H. E.; Cho, K.; Cho, S. -J.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Das, S.; Nardo, G. De; Pietro, G. De; Dhamija, R.; Capua, F. Di; Dingfelder, J.; Doležal, Z.; Dong, T. V.; Epifanov, D.; Ferlewicz, D.; Frey, A.; Fulsom, B. G.; Gaur, V.; Garmash, A.; Giri, A.; Goldenzweig, P.; Graziani, E.; Gu, T.; Gudkova, K.; C., Hadjivasiliou,; Halder, S.; Han, X.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hedges, M. T.; Herrmann, D.; Hou, W. -S.; Hsu, C. -L.; Iijima, T.; Inami, K.; Inguglia, G.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Jang, E. -J.; Ji, Q. P.; Jin, Y.; Joo, K. K.; Kaliyar, A. B.; Kang, K. H.; Kawasaki, T.; Kiesling, C.; Kim, C. H.; Kim, D. Y.; Kim, K. -H.; Kim, Y. -K.; Kodyš, P.; Konno, T.; Korobov, A.; Korpar, S.; Križan, P.; Krokovny, P.; Kuhr, T.; Kumar, M.; Kumara, K.; Kwon, Y. -J.; Lalwani, K.; Lam, T.; Lange, J. S.; Laurenza, M.; Lee, S. C.; Levit, D.; K., Li, L.; Li, Y.; Gioi, L. Li; Libby, J.; Lin, Y. -R.; Liventsev, D.; Luo, T.; Masuda, M.; Matvienko, D.; Maurya, S. K.; Merola, M.; Metzner, F.; Miyabayashi, K.; Mizuk, R.; Mussa, R.; Nakamura, I.; Nakao, M.; Nakazawa, H.; Narwal, D.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nisar, N. K.; Nishida, S.; Ogawa, K.; Ogawa, S.; Ono, H.; Onuki, Y.; Oskin, P.; Pakhlov, P.; Pakhlova, G.; Pang, T.; Pardi, S.; Park, J.; Park, S. -H.; Patra, S.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Prencipe, E.; Prim, M. T.; Rabusov, A.; Röhrken, M.; Russo, G.; Sandilya, S.; Sangal, A.; Santelj, L.; Savinov, V.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Sevior, M. E.; Shan, W.; Shapkin, M.; Sharma, C.; Shen, C. P.; Shiu, J. -G.; Shwartz, B.; Simon, F.; Singh, J. B.; Sokolov, A.; Solovieva, E.; Starič, M.; Stottler, Z. S.; Sumihama, M.; Sumiyoshi, T.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Trabelsi, K.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Vahsen, S. E.; Tonder, R. van; Varner, G.; Vinokurova, A.; Vossen, A.; Wang, D.; Wang, M. -Z.; Wang, X. L.; Watanabe, M.; Won, E.; Xu, X.; Yabsley, B. D.; Yan, W.; Yang, S. B.; Yelton, J.; Yin, J. H.; Yook, Y.; Yuan, C. Z.; Yuan, L.; Yusa, Y.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.

doi:10.48550/arxiv.2301.09421

Cited by 1 publication

(1 citation statement)

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“…The production of C-even quarkonia in γ * γ fusion processes keeps providing us with important information on their structure [1][2][3][4][5][6][7][8]. While untagged e + e − cross sections give access to the decay width of quarkonia into γγ pair, in single tagged collisions, transition form factors involving one virtual and one real photon can be measured.…”

Section: Introductionmentioning

confidence: 99%

χc2 tensor meson transition form factors in the light front approach

Babiarz,

Pasechnik,

Schäfer

et al. 2024

J. High Energ. Phys.

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We continue our work on the light-front formulation of quarkonium γ∗γ transition form factors, extending the formalism to JPC = 2++ tensor meson states. We present an analysis of γ∗γ → χc2 transition amplitude and the pertinent helicity form factors. Our relativistic formalism is based on the light-front quark-antiquark wave function of the quarkonium. We calculate the two-photon decay width as well as three independent γ∗γ transition form factors for Jz = 0, 1, 2 as a function of photon virtuality Q2. We compare our results for the two-photon decay width to the recently measured ones by the Belle and BES III collaborations. Even when including relativistic corrections, a very small Γ(λ = 0)/Γ(λ = 2) ~ 10−3 ratio is found which is beyond present experimental precision. We also present the form factors as a function of photon virtuality and compare them to the sparse experimental data on the so-called off-shell width. The formalism presented here can be used for other 2++ mesons, excited charmonia or bottomonia or even light $$ q\overline{q} $$ q q ¯ -mesons.

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