Precision Measurement of the X(3872) Mass in J/ψπ+π- Decays

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Aaltonen , T , Mehtala , P , Orava , R , Maki , T , Saarikko , H , Osterberg , K & CDF Collaboration 2009 , ' Precision Measurement of the X(3872) Mass in J/ψπ+π- Decays ' , Physical Review Letters , vol. 103 , no. 15 , pp. 152001 . https://doi.org/10.1103/PhysRevLett.103.152001

Title: Precision Measurement of the X(3872) Mass in J/ψπ+π- Decays
Alternative title: Precision Measurement of the X(3872) Mass in J/psi pi+ pi- Decays
Author: Aaltonen, T.; Mehtala, P.; Orava, Risto; Maki, T.; Saarikko, H.; Osterberg, K.; CDF Collaboration
Contributor organization: Helsinki Institute of Physics
Particle Physics and Astrophysics
Date: 2009
Language: eng
Number of pages: 8
Belongs to series: Physical Review Letters
ISSN: 0031-9007
DOI: https://doi.org/10.1103/PhysRevLett.103.152001
URI: http://hdl.handle.net/10138/24406
Abstract: We present an analysis of the mass of the X(3872) reconstructed via its decay to J/psi pi+ pi- using 2.4 fb^-1 of integrated luminosity from ppbar collisions at sqrt(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^2. Under the single-state model the X(3872) mass is measured to be 3871.61 +- 0.16 (stat) +- 0.19 (syst) MeV/c^2, which is the most precise determination to date.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.
Subject: 114 Physical sciences
hep-ex
Peer reviewed: Yes
Usage restriction: restrictedAccess


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