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

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Aaltonen, T., Adelman, J., Akimoto, T., Álvarez González, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., Apollinari, G. et al.
. (2009) Precision measurement of the X(3872) mass in J/ψπ+π- decays. Physical Review Letters, Vol.103 (No.15). Article no. 152001. ISSN 0031-9007

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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_ 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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 9 October 2009
Volume: Vol.103
Number: No.15
Page Range: Article no. 152001
Identification Number: 10.1103/PhysRevLett.103.152001
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: U.S. Department of Energy, National Science Foundation (NSF), Istituto Nazionale di Fisica Nucleare, Ministry of Education, Culture, Sports, Science and Technology of Japan, Natural Sciences and Engineering Research Council (Canada) (NSERC), National Science Council of the Republic of China, Swiss National Science Foundation, A.P. Sloan Foundation, Bundesministerium für Bildung und Forschung (Germany), Korean Science and Engineering Foundation, Korean Research Foundation, Science and Technology Facilities Council (Great Britain) (STFC), Royal Society (UK), Institut National de Physique Nucleaire et Physique des Particules/ CNRS, Russian Foundation for Basic Research, Ministerio de Ciencia e Innovación (Spain), Programa Consolider-Ingenio 2010 (Spain), Slovak R&D Agency, Academy of Finland
URI: http://wrap.warwick.ac.uk/id/eprint/44432

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