Evidence for B(sup+)(yields) J/(psi) p(bar(Lambda)) and Search for B(sup 0)(yields) J/(psi) p(bar p).

Aubert, B. ; Barate, R. ; Boutigny, D. ; Gaillard, J. M. ; Hicheur, A. ; Karyotakis, Y.

Technical Information Center Oak Ridge Tennessee

关键词: Linear accelerators;    Storage rings;    Branching fractions;    BABAR;    Searches;   

RP-ID  :  DE2003812974

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We have performed a search for the decays B+ yields J/Psi p upside down V with a line on top and B0 yields J/Psi pp in a data set of (88.9 X 1.0) X 10 ten to the 6th power gamma(4S) decays collected by the BABAR experiment at the PEP-II e(sup +)e(sup -) storage ring at the Stanford Linear Accelerator Center. Four charged B candidates have been observed with an expected background of 0.21 plus or minus 0.14 events. The corresponding branching fraction is (12(sup +9) (sub -6))X10 to the 6th power, where statistical and systematic uncertainties have been combined. The result can be interpreted as a 90% confidence level (CL) upper limit of 26 X 10 to the minus 6th poser. We also find one B0 candidate, with an expected background of 0.64 plus or minus 0.17 events, implying a 90% CL upper limit of 1.9 X 10 to the minus 6th power.