Details

Autor(en) / Beteiligte

• Park, S.-H.
• Kwon, Y.-J.
• Aihara, H.
• Asner, D. M.
• Atmacan, H.
• Aushev, T.
• Behera, P.
• Bessner, M.
• Bhardwaj, V.
• Bhuyan, B.
• Bilka, T.
• Biswal, J.
• Bozek, A.
• Browder, T. E.
• Chang, M.-C.
• Chang, P.
• Cho, K.
• Choi, S.-K.
• Cinabro, D.
• Dingfelder, J.
• Doležal, Z.
• Dong, T. V.
• Epifanov, D.
• Ferlewicz, D.
• Fulsom, B. G.
• Giri, A.
• Goldenzweig, P.
• Guan, Y.
• Hartbrich, O.
• Hayashii, H.
• Hou, W.-S.
• Huang, K.
• Inguglia, G.
• Ishikawa, A.
• Iwasaki, M.
• Iwasaki, Y.
• Jacobs, W. W.
• Jang, E.-J.
• Jia, S.
• Kawasaki, T.
• Kim, D. Y.
• Kotchetkov, D.
• Križan, P.
• Krokovny, P.
• Li, C. H.
• Li, Y. B.
• Li Gioi, L.
• Libby, J.
• Lieret, K.
• Liptak, Z.
• Liventsev, D.
• Luo, T.
• Masuda, M.
• Matsuda, T.
• Miyabayashi, K.
• Mohanty, G. B.
• Mohanty, S.
• Moser, H.-G.
• Mrvar, M.
• Natochii, A.
• Nayak, M.
• Nisar, N. K.
• Ogawa, S.
• Pakhlov, P.
• Park, C. W.
• Patra, S.
• Piilonen, L. E.
• Podobnik, T.
• Prencipe, E.
• Prim, M. T.
• Ritter, M.
• Rout, N.
• Russo, G.
• Sakai, Y.
• Sangal, A.
• Savinov, V.
• Schnell, G.
• Seino, Y.
• Sevior, M. E.
• Shapkin, M.
• Solovieva, E.
• Stottler, Z. S.
• Sumihama, M.
• Sumisawa, K.
• Sumiyoshi, T.
• Takizawa, M.
• Tanida, K.
• Tenchini, F.
• Uchida, M.
• Unno, Y.
• Uno, S.
• Vahsen, S. E.
• Varner, G.
• Wang, C. H.
• Xu, X.
• Yabsley, B. D.
• Yan, W.
• Yang, S. B.
• Zhilich, V.
• Zhukova, V.

Titel

Search for the dark photon in B0 → A′A′, A′ → e+e−, μ+μ−, and π+π− decays at Belle

Ist Teil von

• The journal of high energy physics, 2021-04, Vol.2021 (4), Article 191

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2021

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• A bstract We present a search for the dark photon A ′ in the B 0 → A ′ A ′ decays, where A ′ subsequently decays to e + e − , μ + μ − , and π + π − . The search is performed by analyzing 772 × 10 6 B B ¯ events collected by the Belle detector at the KEKB e + e − energy-asymmetric collider at the ϒ(4 S ) resonance. No signal is found in the dark photon mass range 0 . 01 GeV /c 2 ≤ m A ′ ≤ 2 . 62 GeV /c 2 , and we set upper limits of the branching fraction of B 0 → A ′ A ′ at the 90% confidence level. The products of branching fractions, ℬ B 0 → A ′ A ′ × ℬ A ′ → e + e − 2 and 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 ℬ B 0 → A ′ A ′ are of the order of 10 − 8 –10 − 5 . From the upper limits of 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 ′ ≃ m B 0 ± 40 MeV /c 2 and 10 − 1 –1 at m h ′ ≃ m B 0 ± 3 GeV /c 2 .