Search for a dark vector gauge boson decaying to π+π- using η →π+π-γ decays

Date Issued
29-11-2016
Author(s)
Won, E.
Adachi, I.
Aihara, H.
Al Said, S.
Asner, D. M.
Aushev, T.
Ayad, R.
Badhrees, I.
Bakich, A. M.
Bansal, V.
Barberio, E.
Behera, P.
Bhuyan, B.
Biswal, J.
Bobrov, A.
Bozek, A.
BraÄ ko, M.
ÄŒervenkov, D.
Chekelian, V.
Chen, A.
Cheon, B. G.
Chilikin, K.
Chistov, R.
Cho, K.
Chobanova, V.
Choi, Y.
Cinabro, D.
Dash, N.
Di Carlo, S.
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.
Goldenzweig, P.
Greenwald, D.
Haba, J.
Hayasaka, K.
Hayashii, H.
Hou, W. S.
Iijima, T.
Inami, K.
Inguglia, G.
Ishikawa, A.
Itoh, R.
Iwasaki, Y.
Jaegle, I.
Jeon, H. B.
Joffe, D.
Joo, K. K.
Julius, T.
Kang, K. H.
Kawasaki, T.
Kim, D. Y.
Kim, J. B.
Kim, K. T.
Kim, M. J.
Kim, S. H.
Kim, Y. J.
Kinoshita, K.
Kodyš, P.
KriŽan, P.
Krokovny, P.
Kuhr, T.
Kulasiri, R.
Kwon, Y. J.
Lange, J. S.
Lee, I. S.
Li, C. H.
Li, L.
Li, Y.
Li Gioi, L.
Indian Institute of Technology, Madras
Liventsev, D.
Luo, T.
Masuda, M.
Matsuda, T.
Matvienko, D.
Miyabayashi, K.
Miyata, H.
Mizuk, R.
Mohanty, G. B.
Nakano, E.
Nakao, M.
Nakazawa, H.
Nanut, T.
Nath, K. J.
Natkaniec, Z.
Nayak, M.
Nishida, S.
Ogawa, S.
Okuno, S.
DOI
Abstract
We report a search for a dark vector gauge boson U′ that couples to quarks in the decay chain D∗+→D0π+,D0→KS0η,η→U′γ, U′→π+π-. No signal is found and we set a mass-dependent limit on the baryonic fine structure constant of 10-3-10-2 in the U′ mass range of 290 to 520 MeV/c2. This analysis is based on a data sample of 976 fb-1 collected by the Belle experiment at the KEKB asymmetric-energy e+e- collider.
Volume
94