Publication
Title
Precision measurement of the X(3872) mass in $J/\psi\pi^{+}\pi^{-}$ decays
Author
Institution/Organisation
CDF Collaboration
Abstract
 We present an analysis of the mass of the X(3872) reconstructed via its decay to J/ψπ+π- using 2.4  fb-1 of integrated luminosity from pp̅ collisions at √s=1.96  TeV, 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 for different assumed ratios of contributions to the observed peak. For equal contributions, the 95% confidence level upper limit on the mass difference is 3.6  MeV/c2. Under the single-state model the X(3872) mass is measured to be 3871.61±0.16(stat)±0.19(syst)  MeV/c2, which is the most precise determination to date.
Language
English
Source (journal)
Physical review letters. - New York, N.Y.
Publication
New York, N.Y. : 2009
ISSN
0031-9007
Volume/pages
103:15(2009), p. 152001,1-152001,8
ISI
000270672100011
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
 Faculty/Department Research group Publication type Subject Affiliation Publications with a UAntwerp address