Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Hadron Structure and Spectroscopy 5

HK 27.5: Talk

Tuesday, March 24, 2015, 15:45–16:00, T/SR19

Test of the X(3872) molecular hypothesis in p A collisions — •Alexei Larionov^1,2, Mark Strikman³, and Marcus Bleicher^1,4 — ¹Frankfurt Institute for Advanced Studies (FIAS), D-60438 Frankfurt am Main, Germany — ²National Research Center "Kurchatov Institute", 123182 Moscow, Russia — ³Pennsylvania State University, University Park, PA 16802, USA — ⁴Institut für Theoretische Physik, J.W. Goethe-Universität, D-60438 Frankfurt am Main, Germany

The mass of the exotic c c state X(3872) deviates by less than 1 MeV from the D⁰ D^*0 threshold. It is thus possible that the X(3872) state is the meson molecule with dominating D⁰ D^*0 + D⁰ D^*0 content. Up to now, however, only indirect tests of this hypothesis have been proposed by measuring the X(3872) radiative and isospin-violating decays. Unfortunately, the decay rates are very sensitive to the model details even within the fixed, e.g. charmonium or molecular model setups, (c.f. [1,2] and refs. therein). We show that the X(3872)-mediated D^* or D production in the antiproton-nucleus reactions results in the narrow light-cone momentum fraction distributions at small transverse momenta. This can serve as an unambiguous test of the molecular picture of the X(3872)-state, similar to the deuteron structure tests by neutron stripping reaction at high energies. Thus, we propose to test the molecular hypothesis of the X(3872)-structure at PANDA by searching for the D, D^* stripping production off nuclear targets

[1] E.S. Swanson, Phys. Lett. B 598, 197 (2004).

[2] F. Aceti, R. Molina, and E. Oset, Phys. Rev. D 86, 113007 (2012).

Supported by HIC for FAIR.