Search for the dark photon in B⁰ → A'A', A' → e⁺e^–, μ⁺μ^–, and π⁺π^– decays at Belle

Journal Article · Tue Apr 20 00:00:00 EDT 2021 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep04(2021)191· OSTI ID:1779858

Park, S. -H.; Kwon, Y. -J.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Atmacan, H.; Aushev, T.; Ayad, R.; Babu, V.; Behera, P.; Bennett, J.; Bessner, M.; Bhardwaj, V.; Bhuyan, B.; Bilka, T.; Biswal, J.; Bonvicini, G.; Bozek, A.; Bračko, M. ; Browder, T. E.; Campajola, M.; Cao, L.; Červenkov, D.; Chang, M. -C.; Chang, P.; Chen, A.; Cheon, B. G.; Chilikin, K.; Cho, H. E.; Cho, K.; Cho, S. -J.; Choi, S. -K.; Choi, Y.; Choudhury, S.; Cinabro, D.; Cunliffe, S.; Das, S.; Dash, N.; De Nardo, G.; Di Capua, F.; Dingfelder, J.; Doležal, Z.; Dong, T. V.; Eidelman, S.; Epifanov, D.; Ferlewicz, D.; Fulsom, B. G.; Garg, R.; Gaur, V.; Garmash, A.; Giri, A.; Goldenzweig, P.; Guan, Y.; Gudkova, K.; Hadjivasiliou, C.; Hara, T.; Hartbrich, O.; Hayasaka, K.; Hayashii, H.; Hedges, M. T.; Hernandez Villanueva, M.; Hou, W. -S.; Hsu, C. -L.; Huang, K.; Iijima, T.; Inami, K.; Inguglia, G.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W. W.; Jaegle, I.; Jang, E. -J.; Jeon, H. B.; Jia, S.; Jin, Y.; Joo, C. W.; Joo, K. K.; Kang, K. H.; Karyan, G.; Kawasaki, T.; Kiesling, C.; Kim, D. Y.; Kim, K. -H.; Kim, S. H.; Kim, Y. -K.; Kinoshita, K.; Kodyš, P.; Konno, T.; Korpar, S.; Kotchetkov, D.; Križan, P.; Kroeger, R.; Krokovny, P.; Kuhr, T.; Kumar, M.; Kumara, K.; Lalwani, K.; Lee, I. S.; Lee, S. C.; Li, C. H.; Li, J.; Li, L. K.; Li, Y. B.; Li Gioi, L.; Libby, J.; Lieret, K.; Liptak, Z.; Liventsev, D.; Luo, T.; MacNaughton, J.; MacQueen, C.; Masuda, M.; Matsuda, T.; Matvienko, D.; Merola, M.; Metzner, F.; Miyabayashi, K.; Mizuk, R.; Mohanty, G. B.; Mohanty, S.; Mori, T.; Moser, H. -G.; Mrvar, M.; Mussa, R.; Nakao, M.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nayak, M.; Niiyama, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Ono, H.; Onuki, Y.; Oskin, P.; Pakhlov, P.; Pakhlova, G.; Pardi, S.; Park, C. W.; Park, H.; Patra, S.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Popov, V.; Prencipe, E.; Prim, M. T.; Ritter, M.; Röhrken, M.; Rostomyan, A.; Rout, N.; Russo, G.; Sakai, Y.; Sandilya, S.; Sangal, A.; Santelj, L.; Sanuki, T.; Savinov, V.; Schnell, G.; Schueler, J.; Schwanda, C.; Seino, Y.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Sharma, C.; Shen, C. P.; Shiu, J. -G.; Sokolov, A.; Solovieva, E.; Stanič, S.; Starič, M.; Stottler, Z. S.; Strube, J. F.; Sumihama, M.; Sumisawa, K.; Sumiyoshi, T.; Sutcliffe, W.; Takizawa, M.; Tanida, K.; Tenchini, F.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Vahsen, S. E.; Van Tonder, R.; Varner, G.; Varvell, K. E.; Vinokurova, A.; Vorobyev, V.; Waheed, E.; Wang, C. H.; Wang, E.; Wang, M. -Z.; Wang, P.; Watanabe, M.; Watanuki, S.; Wehle, S.; Won, E.; Xu, X.; Yabsley, B. D.; Yan, W.; Yang, S. B.; Ye, H.; Yelton, J.; Yin, J. H.; Yusa, Y.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.; Zhulanov, V.

Abstract We present a search for the dark photon A' in the B0 → A'A' decays, where A' subsequently decays to e+e-, μ+μ-, and π+π-. The search is performed by analyzing 772 × 106$$$$ B\overline{B} $$$$ B B ¯ events collected by the Belle detector at the KEKB e+e energy-asymmetric collider at the Υ(4S) resonance. No signal is found in the dark photon mass range 0.01 GeV/c2 ≤ mA' ≤ 2.62 GeV/c2, and we set upper limits of the branching fraction of B0 → A'A' at the 90% confidence level. The products of branching fractions, $$$$ \mathrm{\mathcal{B}}\left({B}^0\to A^{\prime }A^{\prime}\right)\times \mathrm{\mathcal{B}}{\left(A\prime \to {e}^{+}{e}^{-}\right)}^2 $$$$ B B 0 → A ' A ' × B A ' → e + e - 2 and $$$$ \mathrm{\mathcal{B}}\left({B}^0\to A^{\prime }A^{\prime}\right)\times \mathrm{\mathcal{B}}{\left(A\prime \to {\mu}^{+}{\mu}^{-}\right)}^2 $$$$ B B 0 → A ' A ' × B A ' → μ + μ - 2 , have limits of the order of 10-8 depending on the A' mass. Furthermore, considering A' decay rate to each pair of charged particles, the upper limits of $$$$ \mathrm{\mathcal{B}}\left({B}^0\to A^{\prime }A^{\prime}\right) $$$$ B B 0 → A ' A ' are of the order of 10-8–10-5. From the upper limits of $$$$ \mathrm{\mathcal{B}}\left({B}^0\to A^{\prime }A^{\prime}\right) $$$$ B B 0 → A ' A ' , we obtain the Higgs portal coupling for each assumed dark photon and dark Higgs mass. The Higgs portal couplings are of the order of 10-2–10-1 at $$$$ {m}_{h\prime}\simeq {m}_{B^0} $$$$ m h ' ≃ m B 0 ± 40 MeV/c2 and 10-1–1 at $$$$ {m}_{h\prime}\simeq {m}_{B^0} $$$$ m h ' ≃ m B 0 ± 3 GeV/c2.

• Research Organization: Univ. of Hawaii, Honolulu, HI (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
• Contributing Organization: Belle Collaboration
• Grant/Contract Number: SC0010504; SC0012704; SC0009973
• OSTI ID: 1779858
• Alternate ID(s): OSTI ID: 1785935; OSTI ID: 1837918
• Report Number(s): BNL-221545-2021-JAAM; TRN: US2209711
• Journal Information: Journal of High Energy Physics (Online), Vol. 2021, Issue 4; ISSN 1029-8479
• Publisher: Springer Berlin
• Country of Publication: United States
• Language: English

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