Qiu Jianwei, Vary James P, Zhang Xiaofei
Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
Phys Rev Lett. 2002 Jun 10;88(23):232301. doi: 10.1103/PhysRevLett.88.232301. Epub 2002 May 24.
We propose a model for calculating J/psi suppression in high-energy hadron-nucleus and nucleus-nucleus collisions. We factorized the process into a production of the cc- pairs convoluted with a transition probability into the observed J/psi mesons. As the produced cc- pairs exit the nuclear matter, multiple scattering increases the square of the relative momentum between the c and c- such that some pairs are transmuted into open charm states. With only one parameter, the energy gained by the produced cc- pair per unit length in the nuclear medium, our model can fit all observed J/psi suppression data in hadron-nucleus and nucleus-nucleus collisions.
我们提出了一个用于计算高能强子-核子碰撞和核-核碰撞中J/ψ抑制的模型。我们将该过程分解为cc对的产生，并与转化为观测到的J/ψ介子的跃迁概率进行卷积。当产生的cc对离开核物质时，多次散射会增加c和c⁻之间相对动量的平方，使得一些对转化为开放粲夸克态。仅用一个参数，即产生的cc对在核介质中每单位长度获得的能量，我们的模型就能拟合强子-核子碰撞和核-核碰撞中所有观测到的J/ψ抑制数据。
