Decays of the X(3872) and the chi(c1)(2P) charmonium state

作者：Meng Ce^*; Chao Kuang Ta

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2007, 75(11): 114002.

DOI：10.1103/PhysRevD.75.114002

We reexamine the rescattering mechanism for the X(3872), as a candidate for the 2P charmonium state chi(c1)(2P), decaying to J/ psi rho(omega) through exchanging D-(*()) mesons between intermediate states D((D) over bar) and (D) over bar*(D*). We evaluate the dispersive part, as well as the absorptive one, of the rescattering amplitude and find that the contribution from the dispersive part is dominant even when X(3872) lies above the threshold of the neutral channel th(n) = m(D)(0) + m(D*0). We predict R-rho/omega similar or equal to 1 for the m(X) region scanned by experiments. Meanwhile, we also estimate the rate of X -> D-0 <(D)over(0) bar >pi(0). Our results favor a charmonium interpretation of X(3872) when it lies slightly below the threshold of D-0(D) over bar*(0). Furthermore, we evaluated the width of X -> J/psi rho with the help of a phenomenological effective coupling constant g(X), and find the total width of X(3872) to be in the range of 1-2 MeV.

• 出版日期2007-6
• 单位中国高等科学技术中心; 北京大学