Panjab University, Chandigarh 160014, India.
Phys Rev Lett. 2010 Nov 12;105(20):202301. doi: 10.1103/PhysRevLett.105.202301.
The contribution of B meson decays to nonphotonic electrons, which are mainly produced by the semileptonic decays of heavy-flavor mesons, in p + p collisions at √s=200 GeV has been measured using azimuthal correlations between nonphotonic electrons and hadrons. The extracted B decay contribution is approximately 50% at a transverse momentum of pT≥5 GeV/c. These measurements constrain the nuclear modification factor for electrons from B and D meson decays. The result indicates that B meson production in heavy ion collisions is also suppressed at high pT.
在 √s=200GeV 的 p+p 碰撞中，通过非光子电子与强子之间的方位角关联，测量了 B 介子衰变对非光子电子的贡献，这些非光子电子主要是由重味介子的半轻子衰变产生的。在横动量 pT≥5 GeV/c 时，提取的 B 衰变贡献约为 50%。这些测量结果限制了来自 B 和 D 介子衰变的电子的核修正因子。结果表明，重离子碰撞中的 B 介子产生在高 pT 时也受到抑制。
