Decays of the X(3872) and $χ_{c1}(2P)$ charmonium

Details Decays of the X(3872) and $χ_{c1}(2P)$ charmonium Decays of the X(3872) and $χ_{c1}(2P)$ charmonium

2007-03-19

arxiv.org/abs/hep-ph/0703205v2

Phys.Rev.D75:114002,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version submitted and accepted for publication in PRD; more discussions and references added

Scientific paper

10.1103/PhysRevD.75.114002

We re-examine the re-scattering 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 $D(\bar{D})$ and $\bar{D}^*(D^*)$. We evaluate the dispersive part, as well as the absorptive one, of the re-scattering 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 $R_{\rho/\omega}\simeq 1$ for the $m_X$ region scanned by experiments. Meanwhile, we also estimate the rate of $X\to D^0\bar{D}^{0}\pi^0$. Our results favor a charmonium interpretation of X(3872) when it lies slightly below the threshold of $D^0\bar{D}^{*0}$. Furthermore, we evaluated the width of $X\to J/\psi\rho$ 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.

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