Search for a doubly charged DDK bound state in Υ(1S, 2S) inclusive decays and via direct production in e+e− collisions at √s=10.520, 10.580, and 10.867 GeV

Department

Physics

Document Type

Article

Publication Date

12-1-2020

Abstract

We report the results of a first search for a doubly charged DDK bound state, denoted the R++, in ϒ(1S) and ϒ(2S) inclusive decays and via direct production in e+e- collisions at s=10.520, 10.580, and 10.867 GeV. The search uses data accumulated with the Belle detector at the KEKB asymmetric-energy e+e- collider. No significant signals are observed in the D+Ds∗+ invariant-mass spectra of all studied modes. The 90% credibility level upper limits on their product branching fractions in ϒ(1S) and ϒ(2S) inclusive decays (B(ϒ(1S, 2S)→R+++anything)×B(R++→D+Ds∗+)), the product values of Born cross section and branching fraction in e+e- collisions (σ(e+e-→R+++anything)×B(R++→D+Ds∗+)) at s=10.520, 10.580, and 10.867 GeV under different assumptions of R++ masses varying from 4.13 to 4.17 GeV/c2 and widths varying from 0 to 5 MeV are obtained.

Journal Title

Physical Review D

Journal ISSN

24700010

Volume

102

Issue

11

Digital Object Identifier (DOI)

10.1103/PhysRevD.102.112001

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