Measurement of the dipion mass spectrum in <script type="math/tex">X(3872)\rightarrow J/\psi\pi^{+}\pi^{-}</script> decays

Abulencia, A.; Van Remortel, N.; et al.

doi:10.1103/PHYSREVLETT.96.102002

Title

Measurement of the dipion mass spectrum in $X(3872)\rightarrow J/\psi\pi^{+}\pi^{-}$ decays

Author

Abulencia, A.

Van Remortel, N.

et al.

Institution/Organisation

CDF Collaboration

Abstract

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.

Language

English

Source (journal)

Physical review letters. - New York, N.Y., 1958, currens

Publication

New York, N.Y. : American Physical Society , 2006

ISSN

0031-9007 [print]

1079-7114 [online]

DOI

10.1103/PHYSREVLETT.96.102002

Volume/pages