Dresden 2013 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 2: Hadronenstruktur und -spektroskopie

HK 2.3: Vortrag

Montag, 4. März 2013, 11:45–12:00, HSZ-105

Observation of the rare decay B^{±, 0} → J/ψ K⁺ K⁻ K^{±, 0} at BaBar — •Elisabetta Prencipe — Institute for Nuclear Physics, Johannes Gutenberg-Universität Mainz

The experiment BaBar is an asymmetric e⁺e⁻ collider which was located at SLAC (Stanford Linear Accelerator Center). In 9 year of data taking it collected 426 fb⁻¹ integrated luminosity on-peak data at the energy in the center of mass of Υ (4S) (10.56 GeV), then few tens fb⁻¹ data were collected even at the energy in the center of mass of Υ (3S) and Υ (2S). The goal of the BaBar project has been the measurement of the sides and the angles of the Unitarity Triangle; however, thanks to the high luminosity achieved, it became a good charm-factory for spectroscopy studies. The work here presented is the analysis of the rare decays B^±,0 → J/ψ K⁺ K⁻ K^±,0 and B_d⁰ → J/ψ φ, which are channels with hidden s s content. The goal of these analyses is the precise measurement of the Branching Fractions of these channels and the search for possible hybrid states in the invariant mass systems of J/ψ φ and J/ψ K_s⁰. No evidence of a new resonant state was observed, but an interesting effect was investigated at the threshold of the invariant mass distributions J/ψ φ and J/ψ K_S⁰. No evidence of signal for B_d⁰ → J/ψ φ was found, in agreement with the theoretical predictions.