Title
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Measurement of the dipion mass spectrum in decays
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Author
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Institution/Organisation
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CDF Collaboration
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Abstract
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We measure the dipion mass spectrum in X(3872)→J/ψπ+π- decays using 360 pb-1 of p̅ p collisions at √s=1.96 TeV collected with the CDF II detector. The spectrum is fit with predictions for odd C-parity (3S1, 1P1, and 3DJ) charmonia decaying to J/ψπ+π-, as well as even C-parity states in which the pions are from ρ0 decay. The latter case also encompasses exotic interpretations, such as a D0D̅ *0 molecule. Only the 3S1 and J/ψρ hypotheses are compatible with our data. Since 3S1 is untenable on other grounds, decay via J/ψρ is favored, which implies C=+1 for the X(3872). Models for different J/ψ-ρ angular momenta L are considered. Flexibility in the models, especially the introduction of ρ-ω interference, enables good descriptions of our data for both L=0 and 1. |
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Language
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English
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Source (journal)
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Physical review letters. - New York, N.Y., 1958, currens
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Publication
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New York, N.Y.
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American Physical Society
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2006
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ISSN
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0031-9007
[print]
1079-7114
[online]
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Volume/pages
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96
:10
(2006)
, p. 1-7
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Article Reference
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102002
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ISI
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000236062800017
000236969700019
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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