Therefore it is necessary to study the contribution of hadron environment to the suppression . many works have studied j / suppression in hadron environment with glauber model . but the combination of nucleus absorption and comover mechanism in hadron environment can not explain the abnormal suppression of j / production in pb - pb collision yet 但是强子环境中的核吸收和同行粒子对j w的相互作用机制结合起来仍不能解释pbpb碰撞过程中j w的反常压低，也就是说需要引入新的机制，这可能预示着夸克一胶子等离子体的形成。
