Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.2: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

Simulation of the p p → D_s^± D_s^*(2317) ^∓ reaction within the pandaroot framework — •Vishwajeet Jha, Albrecht Gillitzer, and Jim Ritman — IKP, Forschungszentrum, Jülich, Germany

The discovery of the surprisingly light and narrow open charm meson states, such as D_s^*(2317) and D_s(2460), have questioned the vailidity of the “naive quark potential model" to describe these states. The intrinsic width of these states are small enough, so that only the upper limits have been measured (Γ ≤ 4.6 MeV and Γ ≤ 5.5 MeV for the D_s^*(2317) and D_s(2460), respectively). The PANDA experiment at FAIR will provide a suitable environment to measure the width of these states with much higher precision because of the high quality phase space cooled antiproton beam.

Simulations have been performed for the reaction, p p → D_s^± D_s^*(2317) ^∓, within the PANDAROOT framework. Due to the low formation cross section, full reconstruction of the event is not experimentally feasible with sufficient statistics in a resonable time. Instead, by reconstructing the D_s meson in the D_s^± → φ π^± (φ → K⁺ K⁻) decay mode, and tagging only some of the decay products of D_s^*(2317), a sufficiently precise measurement of the width can be performed. We perform a study of possible background channels due to the decay of the binary product D_s and also the generic background due to other p p reactions.

This work has been supported in part by grants from the Indo-German bilateral agreement and FZ jülich.