Precision Measurement of the X(3872) Mass in J/ psi pi + pi - Decays
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Aaltonen-2009-Precision Measuremen.pdf
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Author(s)
Xie, Si
Knuteson, Bruce O.
Henderson, C.
Hahn, Kristian Allan
Gomez-Ceballos, Guillelmo
Choudalakis, Georgios
Paus, Christoph M. E.
Makhoul, Khaldoun
Goncharov, Maxim
Bauer, Gerry P
Alternative Title
Precision Measurement of the X(3872) Mass in J/ψπ+π- Decays
Date Issued
October 2009
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
CDF Collaboration et al. “Precision Measurement of the X(3872) Mass in J/ psi pi + pi - Decays.” Physical Review Letters 103.15 (2009): 152001. © 2009 The American Physical Society
Version
Final published version
Abstract
We present an analysis of the mass of the X(3872) reconstructed via its decay to J/ψπ[superscript +]π[superscript -] using 2.4 fb[superscript -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/c[superscript 2]. Under the single-state model the X(3872) mass is measured to be 3871.61±0.16(stat)±0.19(syst) MeV/c[superscript 2], which is the most precise determination to date.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.103.152001
