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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, vol. 85, p. -

Search for a light exotic particle in J/ψ radiative decays

Ablikim M., Achasov M. N., Ambrose D. J., An F. F., An Q., An Z. H., Bai J. Z., Ban Y., Becker J., Berger N., Bertani M. B., Bian J. M., Boger E., Bondarenko O., Boyko I., Briere R. A., Bytev V., Cai X., Calcaterra A. C., Cao G. F., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen J. C., Chen M. L., Chen S. J., Chen Y., Cheng H. P., Chu Y. P., Cronin-Hennessy D., Dai H. L., Dai J. P., Dedovich D., Deng Z. Y., Denig A., Denysenko I., Destefanis M., Ding W. M., Ding Y., Dong L. Y., Dong M. Y., Du S. X., Fang J., Fang S. S., Fava L., Feldbauer F., Feng C. Q., Ferroli R. B., Fu C. D., Fu J. L., Gao Y., Geng C., Goetzen K., Gong W. X., Gradl W., Greco M., Gu M. H., Gu Y. T., Guan Y. H., Guo A. Q., Guo L. B., Guo Y. P., Han Y. L., Hao X. Q., Harris F. A., He K. L., He M., He Z. Y., Held T., Heng Y. K., Hou Z. L., Hu H. M., Hu J. F., Hu T., Huang B., Huang G. M., Huang J. S., Huang X. T., Huang Y. P., Hussain T., Ji C. S., Ji Q., Ji X. B., Ji X. L., Jia L. K., Jiang L. L., Jiang X. S., Jiao J. B., Jiao Z., Jin D. P., Jin S., Jing F. F., Kalantar-Nayestanaki N., Kavatsyuk M.

Using a data sample containing 1.06×108 ψ ′ events collected with the BESIII detector at the BEPCII electron-positron collider, we search for a light exotic particle X in the process ψ ′→π +π -J/ψ, J/ψ→γX, X→μ +μ -. This light particle X could be a Higgs-like boson A0, a spin-1 U boson, or a pseudoscalar sgoldstino particle. In this analysis, we find no evidence for any μ +μ - mass peak between the mass threshold and 3.0GeV/c2. We set 90%-confidence-level upper limits on the product-branching fractions for J/ψ→γA0, A0→μ +μ - which range from 4×10 -7 to 2.1×10 -5, depending on the mass of A0, for M(A0)<3.0GeV/c2. Only one event is seen in the mass region below 255MeV/c2, and this has a μ +μ - mass of 213.3MeV/c2 and the product-branching-fraction upper limit 5×10 -7. © 2012 American Physical Society.