Is the X(3915) the χc0(2P)?

Stephen Lars Olsen
Phys. Rev. D 91, 057501 – Published 5 March 2015

Abstract

The Particle Data Group Meson Summary Table lists the X(3915) meson, an ωJ/ψ mass peak seen in BKωJ/ψ decays and γγωJ/ψ two-photon fusion reactions, as the χc0(2P), the 23P0 charmonium state. Here, with some reasonable assumptions, it is shown that if the X(3915) is the χc0(2P), the measured strength of the γγX(3915) signal implies an upper limit on the branching fraction B(χc0(2P)ωJ/ψ) that is below a lower limit inferred for the same quantity from the BKX(3915) decay rate. Also, the absence any signal for X(3915)D0D¯0 in B+K+D0D¯0 decays is used to infer the limit B(X(3915)D0D¯0)<1.2×B(X(3915)ωJ/ψ). This contradicts expectations that χc0(2P) decays to D0D¯0 should be a dominant process, while decays to ωJ/ψ, which are Okubo-Zweig-Iizuka suppressed, should be relatively rare. These, plus reasons given earlier by Guo and Meissner, raise concerns about the X(3915)=χc0(2P) assignment.

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  • Received 22 October 2014

DOI:https://doi.org/10.1103/PhysRevD.91.057501

© 2015 American Physical Society

Authors & Affiliations

Stephen Lars Olsen

  • Center for Underground Physics, Institute for Basic Science, Daejeon 305-811, Korea

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Issue

Vol. 91, Iss. 5 — 1 March 2015

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