Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-12-06
Phys.Rev.Lett.96:102001,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 4 figures, Revised version to be published in Physical Review Letters
Scientific paper
10.1103/PhysRevLett.96.102001
We explore the possibility of observing the anti-charmed pentaquark state from the $\Theta_c \bar{n} \pi^+$ decay of $B$ meson produced at $B$-factory experiments. We first show that the observed branching ratio of the $B^+$ to $ \Lambda^-_c p \pi^+$, as well as its open histograms, can be remarkably well explained by assuming that the decay proceeds first through the $\pi^+ \bar{D}^0$ (or $\bar{D}^{*0}$) decay, whose branching ratios are known, and then through the subsequent decay of the virtual $\bar{D}^0$ or $\bar{D}^{*0}$ mesons to $\Lambda_c^- p$, whose strength are calculated using previously fit hadronic parameters. We then note that the $\Theta_c$ can be similarly produced when the virtual $\bar{D}^0$ or $\bar{D}^{*0}$ decay into an anti-nucleon and a $\Theta_c$. Combining the present theoretical estimates for the ratio $g_{D N \Lambda_c} / g_{D N \Theta_c} \sim 13 $ and $g_{D^* N \Theta_c} \sim {1/3} g_{D N \Theta_c}$, we find that the anti-charmed pentaquark $\Theta_c$, which was predicted to be bound by several model calculations, can be produced via $B^+ \to \Theta_c \bar{n} \pi^+$, and be observed from the $B$-factory experiments through the weak decay of $\Theta_c \to p K^+ \pi^- \pi^- $.
Kwon Youngjoon
Kwon Youngshin
Lee Su Houng
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