Journal article

### Precision measurement of the X(3872) mass in J/ψπ+π- decays

Abstract:

We present an analysis of the mass of the X(3872) reconstructed via its decay to J/ψπ+π- using 2.4fb-1 of integrated luminosity from pp̄ collisions at s=1.96TeV, collected with the CDF II detector at the Fermilab Tevatron. The possible existence of two nearby mass states is investigated. Within the limits of our experimental resolution the data are consistent with a single state, and having no evidence for two states we set upper limits on the mass difference between two hypothetical states f...

### Authors

Journal:
Physical Review Letters
Volume:
103
Issue:
15
Publication date:
2009-10-05
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:45bdd638-e460-4708-a67f-a7fe283b6528
Source identifiers:
106093
Local pid:
pubs:106093
Language:
English