Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-02-21
Phys.Rev.D77:097501,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
minor changes
Scientific paper
10.1103/PhysRevD.77.097501
The recently discovered $X$(3872) has many possible interpretations. We study the production of $X$(3872) with PANDA at GSI for the antiproton-proton collision with two possible interpretations of X(3872). One is as a loosely-bound molecule of $D$-mesons, while another is a 2P charmonium state $\chi_{c1}$ (2P). Using effective couplings we are able to give numerical predictions for the production near the threshold and the production associated with $\pi^0$. The produced $X$(3872) can be identified with its decay $J/\psi \pi^+\pi^-$. We also study the possible background near the threshold production for $X(3872) \to J/\psi \pi^+\pi^-$. With the designed luminosity $1.5{\rm fb}^{-1}$ per year of PANDA we find that the event number of $p\bar p \to J/\psi \pi^+\pi^-$ near the threshold is at the order of $10^6 \sim 10^8$, where the large uncertainty comes from the total decay width of X(3872). Our study shows that at the threshold more than about 60% events come from the decay of X(3872) and two interpretations are distinguishable from the line-shape of the production. With our results we except that the PANDA experiments will shed light on the property of X(3872).
Chen Guan Yeu
Ma Jian-Ping
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