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Production of the X(3870) at the Upsilon(4S) by the Coalescence of Charm Mesons | | Eric Braaten
; Masaoki Kusunoki
; | | Date: |
17 Feb 2004 | | Journal: | Phys.Rev. D69 (2004) 114012 | | Subject: | hep-ph | | Abstract: | If the recently-discovered charmonium state X(3870) is a loosely-bound molecule of the charm mesons D^0 and ar D^{*0} or ar D^0 and D^{*0}, it can be produced in e^+ e^- annihilation at the Upsilon(4S) resonance by the coalescence of charm mesons produced in the decays of B^+ and B^- mesons. Remarkably, in the case of 2-body decays of the B mesons, the leading contribution to the coalescence probability depends only on hadron masses and on the width and branching fractions of the B meson. As the binding energy E_b of the molecule goes to zero, the coalescence probability scales as E_b^{1/2} log(E_b). Unfortunately, the coalescence probability is also suppressed by two powers of the ratio of the width to the mass of the B meson, and is therefore many orders of magnitude too small to be observed in current experiments at the B factories. | | Source: | arXiv, hep-ph/0402177 | | Services: | Forum | Review | PDF | Favorites | |
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