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Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.
Phys Rev Lett. 2008 Mar 14;100(10):101802. doi: 10.1103/PhysRevLett.100.101802.
We have performed a search for B(s)(0) --> micro(+) micro(-) and B(0) --> micro(+) micro(-) decays in pp collisions at square root s = 1.96 TeV using 2 fb(-1) of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron Collider. The observed number of B(s)(0) and B0 candidates is consistent with background expectations. The resulting upper limits on the branching fractions are B(B(s)0) --> micro(+) micro(-)) <5.8 x 10(-8) and B(B(0) --> micro(+) micro(-))<1.8 x 10(-8) at 95% C.L.
我们利用费米实验室Tevatron对撞机上CDF II探测器收集的2飞靶-1的积分亮度，在质心能量平方根s = 1.96 TeV的质子-质子对撞中搜寻了B(s)(0)→μ(+)μ(-)和B(0)→μ(+)μ(-)衰变。观测到的B(s)(0)和B0候选事例数与本底预期相符。在95%置信水平下，得到的分支比上限为B(B(s)0→μ(+)μ(-))<5.8×10^(-8)以及B(B(0)→μ(+)μ(-))<1.8×10^(-8)。
