Title
Precision measurement of the X(3872) mass in <tex>$J/\psi\pi^{+}\pi^{-}$</tex> decays Precision measurement of the X(3872) mass in <tex>$J/\psi\pi^{+}\pi^{-}$</tex> decays
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Physical review letters. - New York, N.Y.
Volume/pages
103(2009) :15 , p. 152001,1-152001,8
ISSN
0031-9007
ISI
000270672100011
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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 pp&#773; 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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/78bdfb/fd450149.pdf
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