Model-independent confirmation of the Z (4430 )- state
Abstract
The decay B0→ψ (2 S )K+π- is analyzed using 3 fb-1 of p p collision data collected with the LHCb detector. A model-independent description of the ψ (2 S )π mass spectrum is obtained, using as input the K π mass spectrum and angular distribution derived directly from data, without requiring a theoretical description of resonance shapes or their interference. The hypothesis that the ψ (2 S )π mass spectrum can be described in terms of K π reflections alone is rejected with more than 8 σ significance. This provides confirmation, in a model-independent way, of the need for an additional resonant component in the mass region of the Z (4430 )- exotic state.
- Publication:
-
Physical Review D
- Pub Date:
- December 2015
- DOI:
- 10.1103/PhysRevD.92.112009
- arXiv:
- arXiv:1510.01951
- Bibcode:
- 2015PhRvD..92k2009A
- Keywords:
-
- 14.40.Rt;
- 12.39.Mk;
- 13.25.Hw;
- 14.40.Nd;
- Glueball and nonstandard multi-quark/gluon states;
- Decays of bottom mesons;
- Bottom mesons;
- High Energy Physics - Experiment
- E-Print:
- All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-038.html