Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Hadron Structure and Spectroscopy V

HK 31.1: Gruppenbericht

Dienstag, 29. März 2022, 16:00–16:30, HK-H8

Study of resonant states with c c s s quark content with BaBar and Belle combined data sets — •Elisabetta Prencipe¹, Dmytro Meleshko¹, Jens Soeren Lange¹, Ihor Melnyk², James Ritman³, and Ashish Thampi³ — ¹JLU-Giessen, Giessen, Germany — ²TSNU-Kyiv, Kyiv, Ukraine — ³FZJ, Juelich, Germany

The B factories Belle and BaBar have collected huge data sets at the energy in the center of mass of the Υ(nS), n = 1,2,3,4, Belle even at that of the Υ(5S), integrating roughly 1.5 ab⁻¹ data. This offers unique opportunities to perform spectroscopy studies e.g. in radiative decays or ISR analyses. Waiting that the new Belle II experiment will collect the whole planned data sets, 50 ab⁻¹, we have now the opportunity to perform the analysis of invariant mass systems with c c s s quark content.

A study of resonances with double cs quark content has been conducted with combined BaBar and Belle data sets. We present the results obtained by analyzing the invariant mass systems of J/ψ φ and D_s⁺ D_sJ^(*)− in different production mechanisms: B decays, B_s decays (Belle) and in the continuum. Interesting results are obtained, some of them confirming the LHCb observations in the J/ψ φ invariant mass though B decays. Results obtained in the neutral B channel, B_s and in the continuum are original measurements. This program has been approved by DFG as the first spectroscopy analysis with combined data sets from B factories.