München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Hadron Structure and Spectroscopy III

HK 18.3: Vortrag

Dienstag, 19. März 2019, 14:45–15:00, HS 13

Study of the invariant mass system J/ ψ φ in B decays and continuum with BaBar and Belle combined data sets — •Ashish Thampi¹, Elisabetta Prencipe¹, James Ritman¹, and Jens Soeren Lange² — ¹IKP-1, Forschungszentrum Juelich, Leo Brandt Strasse, 52428 Juelich, Germany — ²JLU Giessen, Physikalisches Institut II, Heinrich-Buff-Ring 16, Germany

The importance of analyzing the J/ψ φ invariant mass system is known, due to the controversial interpretation of two enhancements observed at 4140 and 4274 MeV/c², and two more peaks observed at 4500 and 4700 MeV/c² by the LHCb experiment in the same invariant mass system through B⁺ decays.

The Belle experiment, located around the interaction point of the asymmetric energy e⁺e⁻ collider at KEK (Tsukuba, Japan), collected 772 Mio. B B pairs at the center of mass energy corresponding to the Υ (4S) production. This report will present the preliminary results of MC simulations for the B decay using data collected at the energy in the center of mass of the Υ (4S), and also will show preliminary results of e⁺e⁻ → J/ ψ φ in continuum, by analyzing all data sets collected by Belle at Υ (nS). The goal of this project is to analyze the invariant mass system of J/ ψ φ in different production mechanisms, and combine these Belle results with the corresponding results of an equivalent BaBar analysis to gain sufficient statistics, and perform eventually angular analysis for a better understanding of the c c s s spectrum.