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University of Illinois, Urbana, Illinois 61801, USA.
Phys Rev Lett. 2007 Mar 23;98(12):122002. doi: 10.1103/PhysRevLett.98.122002. Epub 2007 Mar 19.
We present the first observation of the baryon decay Lambda b0-->Lambda c+pi- followed by Lambda c+-->pK-pi+ in 106 pb-1 pp collisions at square root s=1.96 TeV in the CDF experiment. In order to reduce systematic error, the measured rate for Lambda b0 decay is normalized to the kinematically similar meson decay B0-->D+pi- followed by D+-->pi+K-pi+. We report the ratio of production cross sections (sigma) times the ratio of branching fractions (B) for the momentum region integrated above pT>6 GeV/c and pseudorapidity range |eta|<1.3: sigma(pp-->Lambda b0X)/sigma(pp-->B0X)xB(Lambda b0-->Lambda c+pi-)/B(B0-->D+pi-)=0.82+/-0.08(stat)+/-0.11(syst)+/-0.22[B(Lambda c+-->pK-pi+)].
我们展示了在CDF实验中，质心能量√s = 1.96 TeV的106 pb⁻¹质子-质子碰撞中，首次观测到重子衰变Λb⁰→Λc⁺π⁻，随后是Λc⁺→pK⁻π⁺。为了降低系统误差，将测量得到的Λb⁰衰变率归一化为运动学上相似的介子衰变B⁰→D⁺π⁻，随后是D⁺→π⁺K⁻π⁺。我们报告了在pT > 6 GeV/c以上积分的动量区域和|η| < 1.3的赝快度范围内，产生截面（σ）乘以分支比（B）的比值：σ(pp→Λb⁰X)/σ(pp→B⁰X)×B(Λb⁰→Λc⁺π⁻)/B(B⁰→D⁺π⁻)=0.82±0.08（统计）±0.11（系统）±0.22[B(Λc⁺→pK⁻π⁺)] 。
